sounds like??

[scotiascrapiron]

I just dropped a fresh 302 into my b2. After breaking in the motor I think I may developed a problem. Oh no!!! is that a knock I hear or is that proud new papa paranoia? Sounds like a knock to me coming from the back of the motor and a guy I talked to said it sounds like it might be a wrist pin. Does a wrist pin knock or what kind of noise does one make that goes bad? If anybody can give me some ideas as to what I might be hearing please tell me.

 

[Psychopete]

A wrist pin knock sounds a lot like a rod knock. Piston noise will quiet down with the spark plug wire unhooked, where as a rod knock wouldn't change much. Hooking up a timing light to each wire and watching for consistency with the blinking and the noise might help narrow which cylinder a little quicker.

But you might double check things under the dust cover.. I don't know if it's a stick or auto, but the torque converter nuts might be coming loose, or maybe something even with the flexplate. Sometimes exhaust leaks sound kind of like knocks, but I guess more like ticks.

Is the oil pressure good? Were the pistons/wrist pins replaced in the freshing of the motor? Yes, a wristpin can knock if it's warn out. I suspected my 2.2L Dodge had a wrist pin knock since it knocked a little, but ran like that for years. hell who knows, It might still even be going today.

Pete

 

[scotiascrapiron]

it's an automatic and is new from the pan up. The guy helping me first time it timed it (by ear) and was off a few degrees. I had a light put on it today and it seems to have quieted down.I think I might have just had the jitters cause it was the first time I had built a motor by myself.

 

[Joshs93four-oh]

I know a way that you can at least isolate it for bottom or top end. hook a timing light up and if the sound occurs TWICE for every flash, then it is in the bottom end. If it is syncronized with the flash then most likely in the top end. If it is faster than both mentioned above, then check for loose flexplate to converter nuts/bolts. Wrist pins usually will not make noise at idle or under acceleration, but when the rotating assembly is "slacked up" at moderate rpm. If the timing was advanced too far and it is a wrist pin then yes, it will get quieter as you retard the timing. Like previously stated, you can also pull plugs one by one while it is running and when it gets quieter then you have found the hole that is bad. Josh
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