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valve tappets? no shims to adjust valve lash. replace the valve tappet. it comes in differnt thickness or gind the tappet underside to correct valve clearance/s
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"...
possibly tappets need adjusting these are shims in buckets on top of valve springs on 4cyl vehicles and V6
need tools to do and shims on hand due to having to calculate shim needed from clearane measured and what thickness shim is all ready installed
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