Quote:
Originally Posted by bcfishon
Wrist pin sounds similar to a rod or main bearing knock but tends to be noisiest when cold and as motor warms up and expands the noise usually will go away or be less noticable.
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I agree and when you pull a plug and the noise changes from a low frequescy thus to two high frequency clicks, that may also sound like a wrist pin.
Have you ever used a piece of heater hose or old garden hose about 4 feet long, use it like a stethiscope to seek out and localise a funny, (or not so funny) noise,
rod noises or main noises will come from around the bottom of the block. wrist pin noises under load and unloaded are different and can come from lower on the side of the block and up at the top. .lifter noises also come from the side of the block but are more frequent.
descriptions are abstract and subjective. get a a hose and listen to all the different points on several cylinders where moving parts are are doing just that. You will quickly and easily distinguish what parts make what noises, and if one makes a different noise than the other five your heading in the right direction.
your job is easier still because its a streight six rather than a v configuration.