Question about 1983 Honda GL 400 Custom

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How to timing and adjust valve tappet clereance

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Remove the crankshaft tappet cap at the front of the motor and the timing inspection cap on the top right side of the rear cover.
Take off your valve covers.
Rotate the motor clockwise and align the TL mark with the pulsar index mark. Check that all the valves are loose on the left cylinder. The left cylinder must be at T.D.C. top dead center on the compression stroke.
At this time you can adjust your cam chain tension if you are not out fitted with an automatic cam chain tensioner (the cx650 automatic cam chain tensioner will fit in the manual tension models). Loosen the hex stud above the timing inspection hole and re tighten, done.

VALVE CLEARANCE
IN: 0.08 mm (0.003 in.)
EX: 0.10 mm (0.004 in.)

Adjust the valves on the left head first ("TL" mark). Loosen the lock nut, turn the screw until there is SLIGHT drag on the feeler gauge. It is very important that you do not over tighten the valves. The Rocker assembly floats on oil and will zero tolerance the valves all by itself. If you over tighten the valves it will push the rocker to one side and damage the rocker bearing/shaft. Hold the screw and tighten the lock nut . Recheck the valve clearances.
Rotate the crankshaft clockwise and align the "TR" mark on the rotor with the pulsar index mark. The right cylinder must be at T.D.C. at the compression stroke.Make sure all the valves are loose. Adjust the valves and recheck the tolerance after tightening.
Reassemble the motor.

Posted on Dec 30, 2010

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1 Answer

How to adjust tappets


You have asked a very big question. Adjusting the tappets is another way of saying adjusting the valve clearances.

Lots of engines these days are fitted with hydraulic tappets that are self-adjusting. Some engines are overhead camshaft types with bucket tappets and the clearances are adjusted by measuring and selecting different thickness shims. The shims are sometimes under the bucket and sometimes over. The former is a fairly big and complex job to adjust and the latter is fiddly and requires much patience.

Traditional designs using adjusting screws and locknuts exist on all manner of engine types and once the principle of which one to adjust when is learned, these are relatively straightforward.

I strongly suggest you discover first what sort of tappets you need to learn to adjust, learn something about the way the engine works and why the tappets need periodic adjustment and then pay somebody to show you how to do the job so next time you will be able to do it yourself.
Adjusting the tappets is one of the core skills of the mechanic and it is learned better by demonstration and understanding than from a book. No book can adequately describe when a feeler blade has a good or a bad "feel"...

Good luck!

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1 Answer

How to adjust tappet clearance


Solid lifters and/or manually adjustable tappets? Now you are making me feel old. Well, if you have something that old, the way it is done is to use feeler gauges to check the spacing between the tappet and the push rod when the valve is fully closed and the cam lobe for that particular valve is not pushing on the rod at all. Many of those old tappets had a slot for a screwdriver so you could turn them to make the adjustment, and then lock them in place with a wrench by tightening the binding nut onto the rocker arm (tappets are mounted on the rocker arms). Obviously, all of this has to be done with the rocker arm cover(s) removed. That means that before you start, make sure you have a fresh gasket for the cover on hand. You will never get a used gasket to seal a second time.

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1 Answer

Hi have a f22b3 1995exi was wondering if any one nows the specs on the tappet gaps .Also can u adjust them and advance the motor ?? Wanna put it in a motor carna


the valve timing on a motor is set and cannot be altered. The length of time that the valves are held open is determined by the lift of the cam and this period of time that the valves are held open determines how much mixture is allowed into the cylinder. If you advance the cam shaft you may gain extra mixture and a bit more power but on a single cam the exhaust valve timing is altered and so the advantage of the advance is lost. If you want more go from the motor get specially ground cam shafts ( hot cams) As to tappet clearance, if you have hydraulic lifters then they self adjust and thee is no clearance measurement. If you can adjust the tappets then most engines run .010" hot inlet and .012" exhaust hot Setting the tappets closer means that they open sooner but they also close sooner so the amount of mixture is reduced as the time for the mixture to enter the cylinder is reduced.

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Kia carens problems


Tappets......... perhaps is what your friend said. The tappets are part of the engine inlet and exhaust valve set up. Most tappets are self adjusting in modern motors, (Hydraulic).
The old fashioned tappets are manually adjusted during regular car servicing. This happens at set intervals, for instance every 20,000 miles.
Inlet valves allow air and fuel into the engine and exhaust valves let the burnt fuel and air out.
Tappets are fitted between the inlet and exhaust valves, they ensure that the valves open on time and more importantly close properly. If the tappet happened to be badly adjusted and did not let the valve close properly then damage to the valve and cylinder head can happen by burning.
If you have a significant power loss I would be surprised to find that the just tappets/valves were to blame.

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Valve Clearance


Modern cars are hydraulically adjusted at the tappets so there is no adjustment. However the pivot points for the rockers can become seriously worn giving the same noise. The hydraulic tappets them selves wear and allow the oil pressure to drain off too quickly meaning there is a clearance every time the cam activates the tappet. I would have a leak down test done on the hydraulic tappet units and check the rocker shafts for excessive wear.

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Valve settings


- Pull the hand brake and put transmission in neutral.
- Remove spark plug cords.
- Remove the spark plugs.
- Remove the Tappet cover
- Lift up the left front wheel.
Cylinder number 1 is toward the pulleys and belts side.
- Rotate the crankshaft anticlockwise with socket and extension rod and bring the valve tappets (intake and exhaust) No. 4 cylinder on dancing position.
NOTE: THERE ARE OTHER WAYS ALSO TO ADJUST THE FOUR VALVES AT A TIME. BUT AS DIY FOLLOW THE FOLLOWING METHOD TO AVOID ANY CONFUSION.
- Adjust the valve clearance of number 1 cylinder.
Valve clearance:
Intake 0.18 - 0.22 (cold) Exhaust 0.25 - 0.28 (cold)
- Rotate the crankshaft anticlockwise to bring the valves of cylinder 2 on dancing position and adjust the valves of No. 3 cylinder.
- Similarly rotate the crankshaft to bring the valves of No. 1 cylinder on dancing position and adjust the valves of No. 4.
- Rotate the crankshaft anticlockwise to bring the valves of cylinder No. 3 on dancing position and adjust the valve clearance of No. 2 cylinder.

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1 Answer

Tappet`s knocking on my kymco ck 125


Option 1: Go to mechanic

Option 2: Adjust the tappets. If you have never adjusted tappets or worked with engines before it is better to have someone experienced with you. The following is the procedure I use.

1: Carefully remove side panels.
2: Close fuel tap and disconnect pipe.
3: Carefully remove fuel tank. (undo the bolt under the seat and slide the tank 2 inches back, then lift it upwards)
4: Undo the bolts of the cylinder head cover (3 bolts with 12mm head, one of them also holds a small bracket for the throttle cable or ignition wire, I can't remember).
5: Remove the cylinder head cover. If you find this difficult put the bike in 5th gear and rotate the engine (by rotating the rear wheel) to the "inlet valve open" position so that the cover clears the "inlet valve rocker". Be careful that you do not damage the top cover gasket (made of rubber) or you will have an oil leak and no lubrication to the rockers.
6: Rotate the engine to a position with both valves closed, as close as possible to "top dead centre of compression/power strokes". There is a notch on the flywheel indicating top dead centre - you see this by opening the cap on the top of the flywheel cover on the left side of the bike. (do not stay at "top dead centre of exhaust/intake strokes")
7: Check the free play of the rockers on the valves. The service manual recommends a clearance between the valve and the rocker of 0.08mm with the engine cold (left to cool overnight). Maximum acceptable is 0.10mm and minimum is 0.06mm. The gap is checked using a feeler gauge (you know that you have a gap of 0.08mm by sliding a feeler that is 0.08mm thick and there is just a little friction slowing you down - if the feeler is hard to pull the gap is less than 0.08 and if the feeler passes with nothing resisting it then the gap is larger than 0.08mm).
8: If the tappets are knocking then the gap is too large. Undo the locknut on the tappet adjuster (10mm nut at the end of the rocker) just enough to let you turn the tappet adjuster. Then rotate the tappet adjuster until you get the right gap and tighten the locknut. Be sure to hold the tappet adjuster with pliers or something else while tightening the locknut so that the adjuster does not rotate.
9: Check and re-check that the gap between the adjuster and the valve is as specified. Incorrectly adjusted tappets are very bad for the engine, especially "tight" tappets with no gap between adjuster screw and valve. The first time you adjust tappets you might have to repeat from step 7 several times until you get used to it.
10: Assemble everything in the reverse order of disassembly. You might have to rotate the engine to "intake valve open" position again to place the cylinder head cover easily. During assembly be careful the the rubber gasket of the cover is not damaged or out of place. There is an oil path from the head to a nozzle above the rockers and the gasket must seal this well.
10: Once you assemble everything start the engine and once it is hot enjoy a more silent bike. It is normal on these engines to have some tappet noise when cold, but if the tappets are adjusted right they are nearly silent when hot.

Always refer to an expert when you are not sure. Maybe the first time it is safer to watch your trusted mechanic do this work.

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1 Answer

What is involved in a tune up


if petrol - spark plugs, air filter, fuel filter, throttle body clean, ignition timing check and adjustment, exhaust gas check, carburettor adjustment, valve tappet adjustment, ECU code check/scan. fuel injector clean.

if diesel- air & fuel filter, tappet adjustment, check glow plugs, scan ECU, drain sedimenter, may require injector clean and/or fuel timing adjustment.

if your car has a running problem get it diagnosed first.

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1 Answer

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adjustment of valve reasonably simple, remove tappet covers, remove small bung from mag cover top and rotate engine until you are able to see a capital T on the flywheel, providing whist you rotated engine it was on the correct stroke the inlet valve should have just closed when you saw the T. this is the correct stroke. loosen tappets lock nuts, adjust the tappets so you can just move it with your fingers, if your want to get technical the clearances between tappet and valve should be about .05mm

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This car has hydraulic lifters( tappets} therefore should not adjustment, you probably have a bad or weak lifter. But, in any case you have to remove the valve covers to make the adjustment. You will see the adjustable bolt on the rocker arm. rotate the engine until the valve is all the way to the top, [no tension on the valve spring] then place a feeler Gage in between the rocker arm and the valve stem, adjust the rocker arm until the feeler Gage is snug but not tight. Do this with each valve. Check the book for the correct Gage to use but I think it is a .018.

May 15, 2008 | 2006 Datsun Stanza

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