350 engine loud wine after rebuild

eparker

I finished rebuilding a 350 robin in a workhorse and I have a loud wine.
I had the crank rebuilt and replaced the rods as well as the usual rebuild stuff.
It runs fine but has a loud wine type sound from behind the flywheel.
I listend with my stetascope and it is coming from behind the oil pump access plate. I dont think its the pump but maybe the counter balancer gear.......
I hate to start shotgunning it with parts........Does anyone have ideas......??

BGW

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crash12888

If you have a whine that changes pitch with RPM check the external rotating parts first for wear marks or grooves from rubbing.
If nothing then it sounds like a trip back inside! (sucks though)

tonyton

Probably a bearing or gear on the balancer shaft. You can pinpoint it with the stethescope and if it sounds like a gear it's probably a gear. There are some alignment shims that could be a little off. That would set the gears off track and produce noise. I doubt the gear is bad, yet.

eparker

When I have looked at the parts list it looks like there is a spring at the end of the counterbalancer. I am not sure that was on mine. Does anyone know?
Eric

csason

If you take a dowel rod, or a metal solid rod, and a piece of hose, something
the dowel rod will push up into..and you can use that contraption to
hear your engine a little better.

You put the rod against the motor when it's running, and the hose up to your ear. It's a poor man's stethoscope.

I have a 400 dollar Littman, and I like the homemade one better.