1986 Nissan 720 pick up with 247k miles.
Just replaced the original timing chain and sprokets but still has an engine noise.
Noise occurs when hot/cold . Oil is 20w-50. Added STP to see what happens no change in noise.
Cked valve clearence and play. OK
engine makes and niose like valeves or internal part.
I heard that these engines had an internal part from the manufacturing process that is lose in the block?
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1986 720 Z24 engine noise
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