The mags are slick 6399 new in 1998 with 425HR since new.

Thanks Jim, I replaced it with a new one, noise still there.

What is the procedure used for a 500 hr inspection,is the mag run up to operating RPM? The noise I hear sounds very much like a bearing in a mag. Having checked every thing else I am back to the mags. When the 500HR was done they claimed the bearings were good. How would you know they are good if th...

Yes,also cut open remote oil filter both clean.

Thanks for your reply.I have gone over all cowlings and attachments very throughly, found no indication of chaffing or wear.

Hi guys, I was wondering if anyone had any insights on the following problem I am having. I own a Stinson 108-3 on floats with the Franklin 6A 350 CIR 1999 425 TT. I am getting a fairly loud squeak noise starting at 2000 RPM. From idle to 2000 RPM there is no sound. Things I have done to identify th...