Happy New Years!!!
So the background: 2002 Catalina 310 pulled for bottom job and polishing/waxing in December. Planned to install new cutlass bearing by "tapping" out the old one with the prop shaft in place (prop removed). However, we quickly learned that technique wasn't going to work. Needed to either remove the prop shaft or take off the strut...and we hadn't planned on that so we didn't do the bearing change. Old bearing never gave me any issues and there was no play/slop with the shaft inside the bearing...so left the current one in place.
Prop shaft and prop came out of the water with a fairly good growth of barnacles but sand-blasting cleaned it perfectly...looked brand new. There was no prop shaft zinc...must have completely worn away (was installed in the Summer).
Installed 2 x football shaped shaft zincs. Pretty standard I think.
When we painted we put 2 coats of Micron 66 on the exposed prop shaft, the strut, and the prop itself.
Finally relaunched 9 days after pulling it out.
Problem: Now I get a fairly high pitched squeal at RPMs between 1300 and 1900. Idle is 1000-1200 and Max RPM is 2500 (my limit...engine will go to 28-2900).
Boat yard guy told us that sometimes the cutlass bearings "dry out" some and once it "re-soaks" for a while the squeal may go away. Been 2 weeks and still squeals.
Squeal only happens in forward...not in reverse. And squeal doesn't seem to happen if not moving forward...shifted from reverse to forward while moving in reverse at 3+ knots and powered up to 1500 RPM....no squeal while still drifting backwards and standing still. But once moving forward the squeal became apparent.
Do no feel or see any wobble on the prop shaft. Pretty sure it is not the stuffing box. I do get a reasonable stuffing box leak when prop spinning at 2000+ RPM so don't think it is dried out packing glands.
Suspect maybe that the shaft zincs are not properly balanced and causing a slight shaft wobble at those RPMs and squeal is shaft rubbing on cutlass bearing. Going to see if I can get my diving friend to remove the zincs and will see what that does for the situation.
Does anyone have any thoughts on what could be the issue or what might resolve this situation?
Sorry for the long-winded post.
Cheers,
Jim
So the background: 2002 Catalina 310 pulled for bottom job and polishing/waxing in December. Planned to install new cutlass bearing by "tapping" out the old one with the prop shaft in place (prop removed). However, we quickly learned that technique wasn't going to work. Needed to either remove the prop shaft or take off the strut...and we hadn't planned on that so we didn't do the bearing change. Old bearing never gave me any issues and there was no play/slop with the shaft inside the bearing...so left the current one in place.
Prop shaft and prop came out of the water with a fairly good growth of barnacles but sand-blasting cleaned it perfectly...looked brand new. There was no prop shaft zinc...must have completely worn away (was installed in the Summer).
Installed 2 x football shaped shaft zincs. Pretty standard I think.
When we painted we put 2 coats of Micron 66 on the exposed prop shaft, the strut, and the prop itself.
Finally relaunched 9 days after pulling it out.
Problem: Now I get a fairly high pitched squeal at RPMs between 1300 and 1900. Idle is 1000-1200 and Max RPM is 2500 (my limit...engine will go to 28-2900).
Boat yard guy told us that sometimes the cutlass bearings "dry out" some and once it "re-soaks" for a while the squeal may go away. Been 2 weeks and still squeals.
Squeal only happens in forward...not in reverse. And squeal doesn't seem to happen if not moving forward...shifted from reverse to forward while moving in reverse at 3+ knots and powered up to 1500 RPM....no squeal while still drifting backwards and standing still. But once moving forward the squeal became apparent.
Do no feel or see any wobble on the prop shaft. Pretty sure it is not the stuffing box. I do get a reasonable stuffing box leak when prop spinning at 2000+ RPM so don't think it is dried out packing glands.
Suspect maybe that the shaft zincs are not properly balanced and causing a slight shaft wobble at those RPMs and squeal is shaft rubbing on cutlass bearing. Going to see if I can get my diving friend to remove the zincs and will see what that does for the situation.
Does anyone have any thoughts on what could be the issue or what might resolve this situation?
Sorry for the long-winded post.
Cheers,
Jim