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Engine rattle on down rev

delcowizzid

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The pushrods could be hitting the holes in the heads or lifter preload up the ****
 

losh1971

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losh1971

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The pushrods could be hitting the holes in the heads or lifter preload up the ****
Would the noise go away with a few revs if they were hitting?
 

losh1971

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Just took it to the local mech and he wasn't sure. He suggested maybe a chain.
Is it possible that the extra lift has made a rattling chain worse? It always had a slight rattle but you could barely hear it.
 

losh1971

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So just started it again and the noise is not there; it's only once the engine gets hot that it starts. It would seem that when you have a bit more oil pressure the noise goes away. You can also hear the noise for one second, once you shut the engine off.
 

losh1971

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From looking through the JC forums I'm suspecting it could be a timing chain issue. Thoughts on TC issue?
 

EYY

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did you check that theres preload on every lifter? Preload will decrease/clearance will increase as the engine warms. Definitely make sure the pushrods arent making contact with the holes in the head. This happened on later ecotecs as the castings changed slightly - there may have been a similar issue with the buicks. Fix is to either replace pushrods with smaller diameter units or grind/file out each hole (not ideal).

Problem has only started now that you've replaced the rockers - it'll be something to do with that.
 

losh1971

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did you check that theres preload on every lifter? Preload will decrease/clearance will increase as the engine warms.

Problem has only started now that you've replaced the rockers - it'll be something to do with that.

There was preload on every lifter. I have no way of measuring how much. The instructions just said to torque to spec, which I did. Does the rattle in the vid sound like preload?
 

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There was preload on every lifter. I have no way of measuring how much. The instructions just said to torque to spec, which I did.
Did you turn the engine over to tdc on the compression stroke of each cylinder before installing each pair?
 

losh1971

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If it is preload would the noise be constant even when revs are say 2k? As it is the noise goes away with some revs.
 
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