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Old 05-01-2010, 11:00 AM
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marine 502?

My buddy's 502 has tapping lifters .The valve train appears to be non adjustable.The motor had a blown head gasket,we sent both heads to the rebuilt.Installed with new gaskets.We preoiled the motor and fired her up.Long story short, liters taped quite a bit. Changed out for some new lifters,same story.Oh by the way this is a factory hyd roller.Thanks

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Old 05-01-2010, 11:28 AM
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Quote:
Originally Posted by Trailboss71
My buddy's 502 has tapping lifters .The valve train appears to be non adjustable.The motor had a blown head gasket,we sent both heads to the rebuilt.Installed with new gaskets.We preoiled the motor and fired her up.Long story short, liters taped quite a bit. Changed out for some new lifters,same story.Oh by the way this is a factory hyd roller.Thanks
The preload has to be correct- unless you change to an adjustable valve train (highly recommended), the preload has to be adjusted by push rod length.
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Old 05-01-2010, 01:27 PM
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Thanks Cobalt,would you recommend adj push-rods?I know the preload isn' right When you torque the rockers down the lifters collapse quite a bit.This isn't set up like a typical bbc KJ
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Old 05-01-2010, 07:58 PM
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Originally Posted by Trailboss71
Thanks Cobalt,would you recommend adj push-rods?I know the preload isn' right When you torque the rockers down the lifters collapse quite a bit.This isn't set up like a typical bbc KJ
No, you're right- the "net lash" deal is a money-saving tactic plain and simple- both from a parts standpoint but to a greater extent, to be an aid to mass production. Sure wasn't a favor to us, in any event.

The preferred way to go is to convert it to an adjustable valve train. If not that, adjustable p-rods should work- but in a brief search online, I do not see any.

If it were me, I would make a pair of adjustable pushrods and use them to determine the ideal length of the intake and exhaust pushrod (they are different lengths)- being sure that "one size fits all"- that is, that the same length of intake pushrod would work on all the intake valves and the same for the exhaust pushrods. It should be just one length for each unless the heads were milled incorrectly, causing one end to be 'lower' than the other.

Once you have an ideal length for them, go to Summit or ?? and order up the lengths that you need- they come in +/= 0.050" increments from stock, generally.

Sorry I can't be of more help in this.
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Old 05-01-2010, 09:15 PM
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Thanks cobalt,I came up dry on the adj pushrods too.I've got somewhere to start now.
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