Join Date: Jul 2007
Location: Northern Virginia
Thanked 6 Times in 6 Posts
Rep Power: 9
What would be normal shaft vibration?
Had to replace the two front engine mounts on our Yanmar 2gm20f while on the hard--boat was splashed the other day. We had to get it out of the boatyard and back to our marina the next day, so we gave the boat nearly 24 hours to take a normal shape before aligning.
Complication is, PO put a drive saver donut (orange, maybe 2" thick) between shaft flange and trans flange. Do you test with feeler gauge on both sides of the donut? I did check the back side, detected some difference (could get the gauge in one side, but not other), screwed around with mounts (much sweating, cursing, and maybe even some crying), and got it to where things seemed even. When done, shaft seemed fairly smooth at 2400, but of course there is some vibration from the engine and all. How solid should it be? I could dangle an open wrench end (probably not recommended) against the top of the shaft at 2400 and just feel a tiny bit of chatter as it spun.
Ran it 2 hours under load up to marina and it felt fine. Do I need to do more?
2000 Beneteau 331
Northern Chesapeake Bay
Ambition is a poor excuse for not having enough sense to be lazy ~ Steven Wright