Reply To: ’56 Lark rebuild: Unusual noise at piston/rod/crank preassembly

[Don]

Floater wrote:

Thanks for the interest from each responder.   I attached another clip to demonstrate the slight sound when the piston is on the down stroke and then I push on it.  It’s the same with both pistons.  I did use assembly lube when installing the bearing retainers which may be slightly dampening the sound.

I can not isolate the original noise as to TDC or BDC or even which or both pistons.

The rings don’t seem tight at the top of the cylinder.

It does feel like the crank could be hitting; but I can’t understand how that could happen.

Listen careful:  https://youtube.com/shorts/Q9VXua7IryQ?feature=share

I think what you all are saying is: this is not normal & the cases must be opened again to rectify the problem.

Do both pistons make the same noise when this test is applied?  Sure seems like something is wrong with either the rod bearings or wrist pin bearings…