Question about Chevrolet Lumina
Cover OFF Eng Running Turn Rocker nut Clockwise VERY SLOW till Missfire then Back off 1/4 turn Repeat On ALL this is the Long time Way for GM Products Messy but works gota Have A GOOD EAR ON IT hope it Helps
Posted on Jan 16, 2009
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Posted on Jan 02, 2017
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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.
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