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Classic Mustangs Tech Forum

Technical discussions specific to 1964-1967, 1968-1970, and 1971-1973 Classic Mustang. Discuss all tech related to in-line six cylinder and V8 powered Vintage Mustangs here.

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Unread 08-12-2012   #1 (permalink)
Dano67 is offline Rookie

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Default Lifters are tapping need advice

I have a 302 engine that the lifters are making a bit of noise. I saw online how to adjust them and thought to give it a whirl, backing them off till they make noise,then tightening them 3/4 of a turn. next time I start up I notice more noise, not a lot just sounds like the lifters. When I remove valve covers to check again, I notice some of the nuts were able to be moved by hand??? How is this possible? Does the engine need to run a bit to 'reset' them?
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Unread 08-13-2012   #2 (permalink)
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Default

depending on what year the heads are, they may not be adjustable. if they are the positive stop style stud they just torque down to 24 pound feet.
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Unread 08-14-2012   #3 (permalink)
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If you did this with the engine off then a lifter might have been on a cam lobe and taken a good bit to loosen but when you retightened it atop a "lift" cycle it would not require lot to feel tight again. Then when you ran the engine it was sloppy loose.
Look up how to correctly set the backlash on the rockers and do it before any damage occurrs.
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Unread 08-15-2012   #4 (permalink)
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First off, you need to determine if you have adjustable rocker arms, as cindys sn95 pointed out some 302's do not have adjustable rockers (this will have the rocker arm fulcrum extend down to the pedestal in the head) and are torqued to spec, if you have the adjustable type which the fulcrum is round and has a convex side (half rounded) on the bottom, this type has a locking nut for the adjustment (they should not be able to be turned with your fingers) they look like the top is crimped in a little. If you have the non-adjustable type, then torque them to spec, if you still have noise, then try an additive to free up lifters, the other possibility would be worn out pushrods, rocker arms, valves, camshaft and lifters since the oils today do not have the zinc additives, and another possibility would be low oil pressure which might be too thin of oil, or too much clearance on the main and rod bearings (too many miles). My 2 cts. Good Luck.

Last edited by rex1965; 08-15-2012 at 08:53 AM. Reason: more info
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