scott1956
Member
- Oct 16, 2016
- 87
- Boat Info
- 2000 410 Sundancer
1999 Bayliner Trophy 1802
- Engines
- Caterpillar 3126
I have a 2000 410 Sundancer with 3126 CATS and Hurth V Drive transmissions. Over the winter both transmissions were rebuilt, Shafts checked and straightened, couplers refaced, props trued, cutlass bearings replaced and reinstalled with new engine mounts The port side shaft is moving or oscillating quite a bit. I also have what sounds like a prop "singing" only at idle speed in fwd. The mechanic checked the transmission flange, and engine alignment with the boat in the water there is no runout on a dial indicator. The flange coupling was .002 that opens to .008 when the shaft is rotated. Everything was rotated 180 degrees with the same results. This is the only thing that seems strange.
The yard hauled the boat pulled the shaft and had it checked. It is straight and true. I replaced both props re launched and still have the same problem.
Here is a video of the shaft starting at idle speed and going to 2400 RPM.
About 30 seconds in the camera vibration starts sync with the shaft so it looks like it smooths out but it is actually much worse.
https://photos.app.goo.gl/iQFgZdP4UqQJCoss9
There are no noticeable vibrations coming from the running gear and the engines are perfectly still on the mounts. Any thoughts are appreciated.
The yard hauled the boat pulled the shaft and had it checked. It is straight and true. I replaced both props re launched and still have the same problem.
Here is a video of the shaft starting at idle speed and going to 2400 RPM.
About 30 seconds in the camera vibration starts sync with the shaft so it looks like it smooths out but it is actually much worse.
https://photos.app.goo.gl/iQFgZdP4UqQJCoss9
There are no noticeable vibrations coming from the running gear and the engines are perfectly still on the mounts. Any thoughts are appreciated.