I have a 16 blades-offset Feeler Gauge. The values on it are .010 .254 mm on one, .011 279 mm, the other .012 .305 mm .013 .330 mm. Which one am I to use?
SOURCE: how to measure tappet clearance with dial gauge
When setting tappets, it has to be born inind that the valve stem wears an indentation into the face of the rocker. This prevents a really accurate tappet adjustment, so the customer is right again. If you do not posess a tappet setting dial gauge, a normal engineers dial gauge will do just as well. The procedure is the same as using your feeler gauge except that you set the dial gauge up on the cylinder head with the pointer resting on the head of the rocker. Press down fairly firmly on the rocker valve end and zero the gauge. Next lift up on the rocker and read off the clearance, from the gauge, Use a magnetic base to support your gauge and repeat the pocedure for each valve pair.
SOURCE: Which size of feeler gauge do we use for td42 valve tappet clearance
the engine make would be a help but generally if it is petrol ,water cooled --.010" hot inlet and .012" hot exhaust
if diesel then .012" inlet hot and .014" exhaust hot
if air cooled petrol then same as for diesel
best if you get a workshop manual and check for specifics.
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