Mgb valve clearance. Feb 26, 2000 · To take advantage of this bore size (3.

Mgb valve clearance. If it's not one thing its yet another. What's the best kind of gasket to buy? 3. 0. I was just talking to the machinist and summoned from recollection that the clearance with new bronze valve guides should be 8 thousandths. 012 or so? Recommendations Parts MG parts spares and accessories are available for MG T Series (TA, MG TB, MG TC, MG TD, MG TF), Magnette, MGA, Twin cam, MGB, MGBGT, MGC, MGC GT, MG Midget, Sprite and other MG models from British car spares company LBCarCo. 0018 in. The suggested clearance is the optimum to ease the valve off its seat and drop it down as gently as it can, and maintain enough clearance to allow for heat expansion closing the gap. Anyway I have tried down to 0. Become a to hide this ad & support a small business Re: What happened to MGB valve clearance immediately after start up #2 ErnieY Ernie Y Albatera, Alicante, Spain Sign in to contact 1976 MG MGB GT Sep 1, 2014 02:37 PM Top Contributor Joined 13 years ago 19,543 Posts Well unless you grossly maladjusted them in the first place, in which case it probably wouldn't have run for 3 Sep 7, 2025 · I'm wondering if the machinist who rebuilt the cylinder head a couple years ago got the right valve stem-to-guide clearance. Two weeks ago I went for a drive and the rockers becam Sep 21, 2006 · I have a 79B that I would like to check the valve adjustment to be sure it is correct. Even the B series engine, renowned for tappet noise, is quite quiet in the valve gear with newly reground cam and followers. The engineblock is from a 1500CC but has been bored to 1600CC. I checked Check each clearance in the following order. You can use machinist's bluing or a black ink Feb 28, 2020 · I have an 18v engine with a 715 kent fast road cam , i brought the engine , i want to set the valve clearence , Is the valve clearence the same as on a standard cam 0,13 cold ? Thanks Serge In this video, John Twist revisits and remakes an older video on quickly adjusting the valves on any MG engine. No real issues with t google search on the mgb experience can't find it so What's the proceedure for setting valve clearance again? +9 or -9 or what? How do you guys define the feeler gague as fitting "snugly"? It just goes in at all, or it goes in with a lot of force, some force, or lit Hi, I was hoping for some insight from someone on a problem I'm having with my 68 MGB it has the 1800 5 main engine. The minimum piston to head clearance that will not cause damaging contact based on my experience is about . 015 and would bind on the 0. Dec 28, 2013 · Tearing apart my 1800v and when it took off the valve cover I was shocked to find the rockers were (for what I understand) absolutely loose. I'm wondering if the machinist who rebuilt the cylinder head a couple years ago got the right valve stem-to-guide clearance. 25" or 6. The factory selects cold and hot valve lash settings which insure the valves close fully on the valve seats. com responded to my question on how to do it properly with an interesting, and potentially time-saving idea. 4in Ground clearance - 4. I only have the Haynes manual, states clearance should be . It runs well but has noticeable valve clatter. 1 thou extra at the valve clearance. Pinging? Retard timing a bit. Does that sound right. One simple way to check actual valve head clearance in assembly is to place a dab of modeling clay (at least . What clearance am I supposed to be going for? Feb 7, 2010 · The Original Equipment intake valve stem diameter was . As I turn the engine by hand the rockers go up & down. The exhaust valves will always overlap the side of the bore regardless of the combination of head and block. There's reference to it here https://www. The biggest risk with higher wear rates is the wear on the cam followers. It runs well but with some valve clatter. A text insertion here explains the intricacies of the valve train, importance of proper valve clearance and why you should check valve train clearances before doing a compression check. Sep 2, 2013 · I am planning a trip to Charleston to visit my son-in-law who is a mechanic and he wants to set the valve clearance on my MG. Sep 7, 2025 · I've had trouble with my rebuilt 18V engine burning oil, and I think it might be due to oil being pulled into the cylinders via the intake valve stems. ) DO NOT tighten the clearance until the rattle stops or you will cause a valve to burn out - inlet or exhaust. If Dec 23, 2005 · You would adjust the valve clearance such that it felt loose on the 0. 15 feeler) Proper rotation of crank (rule of 9): 8 Open; Adjust 1 6 open, Adjust 3 4 open; adjust 5 7 open; adjust 2 1 open, adjust 8 3 open; adjust 6 Nov 13, 2024 · Not quite sure why it’s called tappet adjustment as its really the rocker to valve gap that is being adjusted. Read something about a shop that rebuilt an engine and delivered it to the customer and in a matter of days this cal Dimensions &amp Weight Wheelbase: 7ft 7in Track - front 4ft 1in Track - rear 4ft 1. Become a to hide this ad & support a small business Re: What happened to MGB valve clearance immediately after start up #2 ErnieY Ernie Y Albatera, Alicante, Spain Sign in to contact 1976 MG MGB GT Sep 1, 2014 02:37 PM Top Contributor Joined 13 years ago 19,543 Posts Well unless you grossly maladjusted them in the first place, in which case it probably wouldn't have run for 3 I'm wondering if the machinist who rebuilt the cylinder head a couple years ago got the right valve stem-to-guide clearance. Interestingly I took google search on the mgb experience can't find it so What's the proceedure for setting valve clearance again? +9 or -9 or what? How do you guys define the feeler gague as fitting "snugly"? It just goes in at all, or it goes in with a lot of force, some force, or lit google search on the mgb experience can't find it so What's the proceedure for setting valve clearance again? +9 or -9 or what? How do you guys define the feeler gague as fitting "snugly"? It just goes in at all, or it goes in with a lot of force, some force, or lit Feb 22, 2011 · The larger valve clearance was for the tighter emissions standards required on the later cars (mostly 1970); another way to tell is the distributor. . 000011 = 1. Can anyone help me wich valve settings are the best for this combination? Jul 30, 2025 · Rocker/valve wear: Do the rockers have more play on the shaft now? Maybe you blocked the oil passage to the rockers somehow and and it wore the bores or head of the rockers and the valve stem. 015 and the rest . Maybe I'll get a better picture later. Valves are numbered 1 to 8 from the front of the engine. The cilinderhead is from a early MGB (1800CC). 9 thou extra. And if you are a racer looking for the last 0. I think I royally messed up on my valve clearances and some more. He was shocked and wanted me to v Valve clearance - somewhere between . Maintaining the correct valve clearance is important to prevent premature valve train wear. Dec 30, 2010 · 1500 valve setting/ clearance adjustment procedure Page 1 2 Topic List Forum List Newer Older Start New Topic Jan 7, 2024 · I did not spring for a small-bore dial gauge but a small-bore gauge paired with a micrometer proved reliable and repeatable to carefully check my valve guide bores. Aug 13, 2013 · Hi, I was hoping for some insight from someone on a problem I'm having with my 68 MGB it has the 1800 5 main engine. Be safe out there. This enables me to feel how much i am tightening the cover to prevent over tightening but sufficient to make a seal. This process is made to seem very difficult and this video sh Apr 4, 2006 · OK let me get this straight. Well, that's seems to be me. Although I guess it in effect adjusts an equivalent gap down on the tappet to ca… Aug 3, 2025 · Interesting problem, maybe some has an idea: I do not think this is related, but this is where things started. It started right up and runs good. Now adjust valve #8 for proper clearance . 015" feeler gauge slipped between the valve stem and the nose of the rocker arm. This is important if you increase compression or use a high performance camshaft. Then it gives the order, such as 1 Recommendations Parts MG parts spares and accessories are available for MG T Series (TA, MG TB, MG TC, MG TD, MG TF), Magnette, MGA, Twin cam, MGB, MGBGT, MGC, MGC GT, MG Midget, Sprite and other MG models from British car spares company LBCarCo. 013" hot which corresponds with the commonly used 0. Took the Rocker head off tonight just to look in there. Which one is correct? google search on the mgb experience can't find it so What's the proceedure for setting valve clearance again? +9 or -9 or what? How do you guys define the feeler gague as fitting "snugly"? It just goes in at all, or it goes in with a lot of force, some force, or lit Aug 13, 2020 · Unless you’re adjusting intake and exhaust valves to different clearances, for the purposes of adjusting valve lash, knowing which valve is which type doesn’t matter. Positioned with the dial-gauge plunger resting on the valve-end of a rocker. Is it normal to have some ticking with solid lifters (been a very long time since I had one of these running) - should I bring them in slightly to like 0. Not pinging? Advance timing a bit. at the push-rod end of the rockers is 0. 014 but cam manufacturer says . 012-. 0020” and a maximum clearance of . My 1980 GT has had a stage 2 head and a different cam fitted (not sure which) the tappets seem to be noisy, the question is will the tappet clearance be the same as specified in the m Jul 31, 2023 · Dear all, I tried to find the required tappet/valve clearance for the inlet and outle valve for the HR270 camshaft in an early 1800 MGB. View and Download MG MGB workshop manual online. May 31, 2025 · Valve Adjustment by John Twist. When the cam comes off it base circle , the ramp on the lobe rises quickly. Also what clearances to use for each type. 016. google search on the mgb experience can't find it so What's the proceedure for setting valve clearance again? +9 or -9 or what? How do you guys define the feeler gague as fitting "snugly"? It just goes in at all, or it goes in with a lot of force, some force, or lit google search on the mgb experience can't find it so What's the proceedure for setting valve clearance again? +9 or -9 or what? How do you guys define the feeler gague as fitting "snugly"? It just goes in at all, or it goes in with a lot of force, some force, or lit google search on the mgb experience can't find it so What's the proceedure for setting valve clearance again? +9 or -9 or what? How do you guys define the feeler gague as fitting "snugly"? It just goes in at all, or it goes in with a lot of force, some force, or lit Hi all I am sure this topic has been covered before, but I would appreciate any help. If you wont to know what the exhaust valve to block clearance is soft spring the exhaust valves, torque the head down on a used gasket. Initially you should check the tappet adjustment (you probably already have). Valve Timing and Adjustment Valve operation over two full turns of the crankshaft as to me that makes it easier to understand the timing and overlap: Valve adjustment methods: The usual method mentioned is the Rule of Nine - you will be adjusting an intake valve when its partner valve is at B, and an exhaust valve when its partner is at C, and needs eight (including getting the first valve Aug 1, 2024 · Hey everyone, what is the correct valve clearance for an MGB 1. Their diameters were not as consistent as I would like over the length of the guide, and clearances were not per the many recommendations on this forum for bronze valve guides given their higher thermal expansion coefficient (0. Sorry about the glare on the dial indicator here. The MGA (or MGB) rocker arm has a mechanical ratio of 1. I don't like having to fight around the hot heater pipe on top of the valve cover Also, the only time I've had a clearance issue was if I didn't get a lock nut tight and it allowed the adjuster to work loose to the point where the valve wasn't opening (or just barely so). Here it is: I tried to do a valve clearance adjustment last night, and ended up getting the clearance too loose. Checking the lobes for wear is well worth it as they can sometimes be worn beyond simple repair. at The MG Experience Mar 28, 2017 · Hi, Can anyone here help me with this? I own an 1956 MGA. 064mm), matching the individual valve stem diameters to their respective bores in the valve guides. 9in Overall height - 4ft 1. 015" cold valve clearance. Here the cylinder head is sitting temporarily on a new head gasket May 13, 2010 · If you have an MGB and do some of your own maintenance, one of the tasks you probably do is adjusting the valve clearance. From what I calculate, there will be say 10 thou clearance between the exhaust valve head and the top of the block, when the valve is fully open. - Warm is good (not too hot). If you remove the rocker arm assembly and set up a dial indicator with a magnetic base (a fairly inexpensive tool) on each push rod, one by one, and measure your cam lift, then you should find the offending cam lobe/s. 0025" / 0. Rocker/valve wear: Do the rockers have more play on the shaft now? Maybe you blocked the oil passage to the rockers somehow and and it wore the bores or head of the rockers and the valve stem. Jan 17, 2009 · I'm getting ready to adjust my valves and have run into a problem. 5" x 70 x . 3645" or 9. No real issues with t google search on the mgb experience can't find it so What's the proceedure for setting valve clearance again? +9 or -9 or what? How do you guys define the feeler gague as fitting "snugly"? It just goes in at all, or it goes in with a lot of force, some force, or lit May 18, 2007 · Does anyone set their valves (. I replaced the cylinder head gasket. My 1980 GT has had a stage 2 head and a different cam fitted (not sure which) the tappets seem to be noisy, the question is will the tappet clearance be the same as specified in the m Jul 30, 2025 · Rocker/valve wear: Do the rockers have more play on the shaft now? Maybe you blocked the oil passage to the rockers somehow and and it wore the bores or head of the rockers and the valve stem. Oct 26, 2015 · In reply to # 3113008 by rpmerrill I just watched John Twist do his amazingly quick and easy valve adjustment. Cam Timing and VALVE HEAD CLEARANCE -- CM-201A CM-201 is a more advanced course for the problems of cam timing and valve clearance from internal engine parts. If they make noise tighten them up a bit - Jeez. Apr 14, 2011 · I've watched Twist's video on adjusting the valves and just can't figure out a few things before I try it myself on my 1980 MGB. Dec 10, 2014 · In the case of valve clearances, if you know the clearance puts take-up just off the ramp then you need to check the adjustment more frequently so it doesn’t get too agressive after wear. Apr 5, 2009 · From the manual: It is important that the clearance is set when the tappet of the valve being adjusted is on the heel of the cam, (ie opposite the peak) This can be effected by carrying out the adjustments in the following order (which also avoids turning the crankshaft more than necessary). the lift will still be good. All of the metals will have enlarged together. 015" feeler on all the MG models except on the MGB later models with the 18V engines. 5 Nm of torque you are probably on the wrong forum - LOL Home CAR SPECIFICATIONS - MGB ROADSTER 72-74CAR SPECIFICATIONS - MGB ROADSTER 72-74 May 30, 2018 · Just researching bronze valve guide materials. 625") and exhaust valve (1. 2 to 1. MG MGB Technical - Valve clearance This thread was discussed between 14/08/2013 and 07/09/2013 Aug 17, 2016 · I have heard various opinions about valve stem to guide clearancesbased on silicon bronze guide material. Too tight and there is a risk that the valves won’t seat properly and burn out, too loose and the valve train will hammer itself to death. Dec 6, 2014 · Any of you know how much can be skimmed from an 18V high compression cylinder head before the exhaust valve cut outs in the block have to be enlarged. 35mm, valve lift is 0. The factory manual and Haynes manual both say to adjust when the engine is cold. Should I plan on a new valve cover gasket? If so what type, Fel-Pro ok? What is the setting for a stock engine? Can someone lay out the procedure and any other parts as a result of this check? Than John Twist demonstrates a quick and precise method of valve adjustment for any MG 1945 → 1980 (save the MGA Twin Cam and the MGB/GT V8). Apr 3, 2011 · I know I need to adjust the valves in my '71 MGB. 010" valve clearance. Your clearance is set! Replaces the clumsy screwdriver/wrench combination with a single easy to use tool Sep 7, 2010 · Library Article: Massive article covering all aspects of performance tuning and rebuilding of the MGB engine. The valve adjustment is by the use of a . e by dividing designated clearance by the standard rocker ratio and multiply by increased ratio rockers. Cam lift i. Jul 30, 2025 · When a cam lobe starts wearing, it happens quickly. Lifter/cam wear Do the offending Sep 7, 2025 · I'm wondering if the machinist who rebuilt the cylinder head a couple years ago got the right valve stem-to-guide clearance. Meaning the ball on the end of rocker where the push rod is was On the valve side the valve tip clearance will increase by an amount equal to the extra expansion over the distance of the valve seat to head top, approx 2. We would like to show you a description here but the site won’t allow us. Prior to doing the clearances I had shifted one pushrod from one valve rocker to another rocker to see if the "ticking noise" would go away. 015 - that's easy enough. Even had a pl MG MGB Technical Tappet Clearance BBS discussionThis thread was discussed between 18/10/2004 and 21/10/2004 MG MGB Technical index This thread is from the archive. 0008 to 0. 5 months ago came with an aftermarket camshaft in it but I wasn't able to figure out which one. 070"), we recommend using the MGB large intake valve (1. May 28, 2025 · However, the valve train sounds noisy to me, even after going through and carefully setting each rocker to the 0. 344") cylinder head and head gasket as fitted to 1972-1974 1/2 models (see Tech article MGB10 "MGB Engine Rebuild Information"). The Bentley manual says 0. Another thing that works for me when setting the valves using the Rule of 9s: When rolling the crank, let the valve that is going open - open completely plus a smidge more. 3422” to . Barney Gaylord of mgaguru. I have been experiencing some exhaust valve sticking and would like to see others opinions. I have never seen a flat top MGB need valve reliefs in the piston crown. Sep 8, 2025 · I've had trouble with my rebuilt 18V engine burning oil, and I think it might be due to oil being pulled into the cylinders via the intake valve stems. The head is an XRN purchased new in 2016, so I'm not sure the workshop manual is correct for it, but the manual says the stem-to-guide clearance for an intake valve for "later cars" should be 0. 010", maximum valve lift includes initial . 8 fully open if clearance needs adjustment, using a large screwdriver and 1/2" AF spanner, slacken the locknut and rotate the adjusting screw clockwise to reduce or anti-clockwise to increase the clearance. At 20 thou clearance the take up speed has doubled, and is still accelerating hard. Read something about a shop that rebuilt an engine and delivered it to the customer and in a matter of days this cal Recommendations Parts MG parts spares and accessories are available for MG T Series (TA, MG TB, MG TC, MG TD, MG TF), Magnette, MGA, Twin cam, MGB, MGBGT, MGC, MGC GT, MG Midget, Sprite and other MG models from British car spares company LBCarCo. 013 Should I set all to . May 13, 2010 · Library Article: An easy to read table of common MGB specifications for model years 1965-1970. 9 makes a total of 5. Feb 17, 2005 · google search on the mgb experience can't find it so What's the proceedure for setting valve clearance again? +9 or -9 or what? How do you guys define the feeler gague as fitting "snugly"? It just goes in at all, or it goes in with a lot of force, some force, or lit Apr 21, 2004 · When I do a cold recheck later, they are always out. Should be oily and lubricated. With a head gasket in place this will increase by the thickness of the gasket, to say 50 thou. Lifter/cam wear Do the offending Jan 7, 2017 · After installing them into the cylinder head, always ream the bronze valve guides to the maximum clearance specified for that of the Original Equipment cast iron valve guide (0. When Valve #1 - front of car, is open, the rocker should be compressing the spring, in turn. I took it in for a standard tuneup when I got the car and the mechanic said the valves were set at . 005" piston proud of the block at TDC with a Payen gasket. MG MGB Technical - Valve Clearance This thread was discussed between 08/10/2007 and 10/10/2007 Apr 6, 2007 · Re: Questions about timing and valve lash on a 74 Ok, I found my original post from a long time ago, and the advice came from Barney Gaylord. Add 3. As a rule of thumb, every . 038" which allows no more than . PP-525 os - Classic Conversions Engineering - V6 and 5-Speed (for MGB) PP-526 os - MGA MkII with Intercooled NISSAN 16 valve DOHC CM-201 - Cam Lift and VALVE HEAD CLEARANCE CM-201A - Cam Timing and VALVE HEAD CLEARANCE CM-201B - Cam Timing - DEGREE WHEEL And INDICATORS CM-201C - Cam Timing - ADJUSTABLE SPROCKETS And KEYS Jul 30, 2025 · Strange. I thought I was all set to go until he said, we use a 0. My 1980 GT has had a stage 2 head and a different cam fitted (not sure which) the tappets seem to be noisy, the question is will the tappet clearance be the same as specified in the m Jun 15, 2021 · Many will know that for the longest time I've been setting my valve clearances hot to 8 inlet and 10 exhaust. 015". 42:1 with the valve end being longer and moving farther than the pushrod end. I have a head in at the local machine shop for an overhaul. My 1980 GT has had a stage 2 head and a different cam fitted (not sure which) the tappets seem to be noisy, the question is will the tappet clearance be the same as specified in the m Hi all I am sure this topic has been covered before, but I would appreciate any help. The early Series 2 distributor does not have a vacuum advance; the later engine has a vacuum retard. I valve with No. However the tag on the valve cover says to adjust when hot. 8 valve clearance discussion in MGB Enthusiast Club It is a popular modification to install an early MGB cylinder head on an MGA engine, and that head also has valves 1/16" larger than the 1500/1600 head. This means that the intended . 5in Turning circle - 32ft Kerb weight - 18. The measurements will be taken Dec 2, 2001 · Been sometime - finally have the head restored and everything else mostly done to the engine. Is the adj Aug 13, 2006 · Hi Folks, I'm hoping to do this for the first time tomorrow. 014" cold and this has not done much for the "sewing machine" sound. Then install the head gasket and the head (lightly torqued) with pushrods and rocker gear in place, and adjust valve clearance to nominal specified running clearance. Lifter/cam wear Do the offending google search on the mgb experience can't find it so What's the proceedure for setting valve clearance again? +9 or -9 or what? How do you guys define the feeler gague as fitting "snugly"? It just goes in at all, or it goes in with a lot of force, some force, or lit Jul 30, 2025 · Strange. I am having hardened seats fitted to the head and the shop will skim the head by either whatever I tell them or until its true. MG MGB Technical - Valve Adjustment Specs This thread was discussed between 05/07/2009 and 26 I have a MGA with an old Riley 1622 engine and MGB head. Lifter/cam wear Do the offending valves move as much as the other valves? If they move a lot less now then the lobe of the cam is gone. 001" decrease in valve clearance will result in approximately 2 degrees of valve open duration. Hi, I was hoping for some insight from someone on a problem I'm having with my 68 MGB it has the 1800 5 main engine. Meaning I could rock the "closed" valves rockers back and forth at least a 1/8" each. May 13, 2021 · Good evening, I have owned my 1975 MGB for four years but only had it on the road last fall. Following advice from Peter Burgess I decided to reset the Valve Clearances to 16 thou inlet, 18 thou exhaust, to accommodate the Stage 2 Head. My ideas to find issues: Damaged pushrod Rotate the pushrods to see if the offending ones bent and look for wear on the end. Jul 30, 2018 · google search on the mgb experience can't find it so What's the proceedure for setting valve clearance again? +9 or -9 or what? How do you guys define the feeler gague as fitting "snugly"? It just goes in at all, or it goes in with a lot of force, some force, or lit Regular maintenance for your classic car involves making sure the valves are adjusted properly. Follower wear will result in increasing clearances that you have had, but not necessarily cam wear i. I had the head rebuilt and I reinstalled it. e. However, I couldn't find them, also not on this incredible forum nor on Pipers website. at The MG Experience Oct 26, 2022 · What valve lash clearances would one want with a new D9 camshaft? The book calls for . In theory you can do this using 3 separate feeler gauges, but it isn't the same as slipping a single gauge under the rocker and feeling the change. See also the page on valve clearances. 25in Overall length - 12ft 9. Turn the handle, click and tighten. 0025”. My first problem was knowing which is number 1 and which is number 8? Also how do I know when a valve is fully open? Also h Valve Clearances with a dial-gauge Trial fit of a plate for the magnetic base of the dial-gauge, secured to the exposed threads of the two end cylinder-head studs. If you have a B series engine, see below regarding the clearance to use. Among other things, he's installing bronze guides. Pop-ups/domes absolutely, flat tops no. mgexp. Valve adjustment shown - cold technique (0. No real issues with t May 15, 2017 · Personally, I've done it both ways but prefer to do it cold. 015" gap at the output end represents only . Do what the cam grinder said, not what the armchair experts who have never ground or tuned a camshaft think they read on the Internet. While there are many ($$$) diagnostics tools available today, I doubt a 1950's technology engine needs them to be streetable. Home CAR SPECIFICATIONS - MGB GT 72-74CAR SPECIFICATIONS - MGB GT 72-74 Mar 18, 2001 · Test 3: Valve spring substitution, dual valve spring 216#, valve spring seat pressure 115#, valve clearance . I have read the threads on here re 18V and am a little confused. 3442” to . Jun 12, 2017 · My question is about the valve clearance for the late model MGB. 015)? Someone told me that this is the better method because the setting will be more accurate when the engine is running at its desired temp. Sponsored Links. Post Edited (04-21-04 08:12) David Reply May 16, 2010 · The first tap is the tappet hitting the valve to open. When you replace the valve cover do you use a gasket sealer material or just dry? 2. Count the valves from the front of the engine to that valve, take that number from nine, then count to that number from the front of the engine again and adjust that valve. One hand holds the feeler gauge, while the other hand holds a 1/2" wrench to loosen and hold the adjuster screw lock nut, and the third hand holds a Paul, can you please explain the reasoning behind increasing valve clearances for high ratio rockers i. Greetings, I have owned my 1975 MGB for four years but just got it on the road last fall. Aug 9, 2020 · Hi All, I have a 74 MGB with 18V engine, playing with valve clearances currently. VALVE CLEARANCE EYEBROWS - Page 2 of 4 The process starts with some very careful measurements of the valve locations in the cylinder head, followed by more careful transfer of those dimensions to the top of the engine block, and finally using the circle template and a scribe tool to mark the desired location of the new cuts on the top of the block. With this change comes increased valve overlap, with possibly lower engine idle vacuum readings and decreased gas mileage. The plug leads have been moved out of the way, the plugs themselves will also be removed to make turning the engine easier. You can use machinist's bluing or a black ink Feb 26, 2000 · To take advantage of this bore size (3. Set everything up and have been driving a few times without any problems. This British tool takes much of the effort out of this necessary job. Theory & then the practical application to quickly and simply adjust the valves on an MGB or other MG. The head is an XRN pur Apr 2, 2006 · MGB Production Data For a more complete description of the VIN plate found on the dash and the engine number, and the meaning of the letters in those numbers, please read the MGB VIN FAQ article in the MG Experience Tech Library. 015 cold. Jul 30, 2025 · Strange. 013) with the engine hot versus cold (. MGB automobile pdf manual download. Hot & Cold valve lash are 'safety settings' The gap between the rocker's tip and the valve's tip is designed to account for heat expansion of every component of the valve train from the cam shaft to the head. 018, so what is best? Somewhere in between? Do/can any of you Gentlemen adjust the valve clearances with the ENGINE RUNNING? A mechanic friend many years ago applied THAT Technique to my very First car, he felt HE was an EXPERT and adjustments could be made within MINUTES, HE WASN'T as TWO BROKEN valve stems later proved on the M1 moto Mar 27, 2010 · I need to respectfully disagree with a few of Basil's comments above. 3427”, while the bore of the Original Equipment cast iron intake valve guide was . 009 which he said seemed very tight as I google search on the mgb experience can't find it so What's the proceedure for setting valve clearance again? +9 or -9 or what? How do you guys define the feeler gague as fitting "snugly"? It just goes in at all, or it goes in with a lot of force, some force, or lit Hi, I was hoping for some insight from someone on a problem I'm having with my 68 MGB it has the 1800 5 main engine. - First check the torque google search on the mgb experience can't find it so What's the proceedure for setting valve clearance again? +9 or -9 or what? How do you guys define the feeler gague as fitting "snugly"? It just goes in at all, or it goes in with a lot of force, some force, or lit Hi all I am sure this topic has been covered before, but I would appreciate any help. Is this worth sweating over (sorry, no pun intended). This will prevent the valves from seizing. No real issues with t Adjusting tappets is never a pleasant chore. I know, I know stupid. 015? Measurements were taken cold Thanks, Dennis Mar 5, 2001 · This has the advantage of being able to increase the intake and exhaust valve open duration. Upon checking clearances I found one with . 0015”, a nominal clearance of . Sep 3, 2019 · More MG woes. 5cwt Feb 1, 2017 · Chris Howells 1968 MGB Purchased already dis-assembled but which is largely back together so I'm a lot less ignorant. set the lash to zero, bring the camshaft to full lift, place a dial indicator on the valve spring retainer, push the exhaust valve down until it contacts the block, and then ad the lash value. The head is an XRN pur Aug 17, 2016 · I have heard various opinions about valve stem to guide clearancesbased on silicon bronze guide material. Check No. Couple of problemsthe engine data plate is missing so I have no way to verify which engine I have so I don't know what clearence to use. John walks through a brief explanation on how the valves works, shows the process on It is a popular modification to install an early MGB cylinder head on an MGA engine, and that head also has valves 1/16" larger than the 1500/1600 head. So 10 thou cold should be right. Mar 31, 2020 · On reassembly i oiled the rubber seals around the rocker cover screws to lessen the turning friction caused by dry rubber. 3447”, giving a minimum clearance of . when adjusting No 1 have No 8 fully open (it always adds up to 9 with a 4 cylinder motor and 13 with a 6 cylinder. However, I'm to the point of adjusting the Valve clearance the first time around. 0106" motion at the input end where the adjuster screw is located. Hi all I am sure this topic has been covered before, but I would appreciate any help. 8 from 1969? In mm MGB 1. Trying to avoid the disaster of valves sticking when temperature rises. 013 and . Become a to hide this ad & support a small business Re: What happened to MGB valve clearance immediately after start up #2 ErnieY Ernie Y Albatera, Alicante, Spain Sign in to contact 1976 MG MGB GT Sep 1, 2014 02:37 PM Top Contributor Joined 13 years ago 19,543 Posts Well unless you grossly maladjusted them in the first place, in which case it probably wouldn't have run for 3 google search on the mgb experience can't find it so What's the proceedure for setting valve clearance again? +9 or -9 or what? How do you guys define the feeler gague as fitting "snugly"? It just goes in at all, or it goes in with a lot of force, some force, or lit google search on the mgb experience can't find it so What's the proceedure for setting valve clearance again? +9 or -9 or what? How do you guys define the feeler gague as fitting "snugly"? It just goes in at all, or it goes in with a lot of force, some force, or lit Hi all I am sure this topic has been covered before, but I would appreciate any help. This will give google search on the mgb experience can't find it so What's the proceedure for setting valve clearance again? +9 or -9 or what? How do you guys define the feeler gague as fitting "snugly"? It just goes in at all, or it goes in with a lot of force, some force, or lit Hey everyone, My MGB which I bought roughly 3. 25mm. With a large clearance, this means the Excessive tappet noise is an indication that something needs attending to. 014 section, some friction on 0. 2in Overall width - 4ft 11. Torqued it to all its correct settings and set the valve clearance to . Phosphor, silicon aluminum or manganese bronze. Students Technical Notes were used for training mechanics to service the then new MGB GT V8 model Home CAR SPECIFICATIONS - MGB GT 67-71CAR SPECIFICATIONS - MGB GT 67-71 We would like to show you a description here but the site won’t allow us. Just had the exhaust valve seats unleaded. The second tap is the valve slamming shut. 1. He It is important to adjust the clearance when the valve is fully closed, i. 015 clearance as indicated in the manual. Only a cold figure of 15 thou is given up to 18V. My 1980 GT has had a stage 2 head and a different cam fitted (not sure which) the tappets seem to be noisy, the question is will the tappet clearance be the same as specified in the m Sponsored Links. The Live MG MGB Technical BBS is active now. - Contrary to some previous postings the valve adjustment (clearance) does change the camshaft timing, and Racer Brown specified the adjustment knowing this. 100" thick) on top of the block where the valve head will approach. Sep 7, 2025 · I'm wondering if the machinist who rebuilt the cylinder head a couple years ago got the right valve stem-to-guide clearance. jrb sbrmu voci guzdk xjntl nhlr mggbh zokz txkvxxw ghjgm