Bertram31.com General Bulletin Board

Re: shaft wear

Posted By: Vic Roy
Date: Monday, 21 February 2005, at 6:05 p.m.

In Response To: Re: shaft wear (Capt. Dave Kosh)

I'm with the experts (Carl, for example) on shafts. They are an expenible item, they wear out, period. My experience is that with a diesel boat, where there is a lot more torque applied, they are good for about 1500 hours then you better be thinking about changing them out. Diesel boats tend to run heavier props (lbs, due to more diameter) and the sheer weight of the prop sitting on the shaft for months without turning will cause stress cracks in the shaft between the strut and the prop hub. That's why the shafts should be turned, either by hand or by bumping in and out of gear, as often as you can to spread the load.

AQ 22 is far and away the best. I agree that zero to .010" is the tolerance for wobble. Otherwise you start tearing up everything, mounts, couplings, struts, stuffing boxes. You absolutely have to torque the gear/shaft coupling bolts to spec. Also make sure some bonehead has not put the wrong (too small) size bolts in the coupling or you will get shaft wobble from the slop in the bolt holes.

UV

Messages In This Thread

shaft wear
John Davis -- Sunday, 20 February 2005, at 10:09 p.m.

Re: shaft wear
Mitch -- Monday, 21 February 2005, at 6:46 a.m.

Re: shaft wear
Charlie Haws -- Monday, 21 February 2005, at 8:43 a.m.

Re: shaft wear
david jones -- Monday, 21 February 2005, at 9:00 a.m.

Re: shaft wear
Charlie Haws -- Monday, 21 February 2005, at 9:43 a.m.

Re: shaft wear
Capt. Dave Kosh -- Monday, 21 February 2005, at 9:55 a.m.

Re: shaft wear
Carl -- Monday, 21 February 2005, at 10:20 a.m.

Re: shaft wear
Joef -- Monday, 21 February 2005, at 2:31 p.m.

Re: shaft wear
John Davis -- Monday, 21 February 2005, at 3:16 p.m.

Re: shaft wear
cwj -- Monday, 21 February 2005, at 4:20 p.m.

Re: shaft wear
bruce doan -- Thursday, 24 February 2005, at 10:10 a.m.

Re: shaft wear
John Davis -- Monday, 21 February 2005, at 3:40 p.m.

Re: shaft wear
Capt. Dave Kosh -- Monday, 21 February 2005, at 4:53 p.m.

Re: shaft wear
Vic Roy -- Monday, 21 February 2005, at 6:05 p.m.

Re: shaft wear
Terry -- Monday, 21 February 2005, at 8:27 p.m.

Re: shaft wear
Vic Roy -- Monday, 21 February 2005, at 9:03 p.m.

Re: shaft wear - an alternative solution
Rawleigh -- Tuesday, 22 February 2005, at 11:06 a.m.

Re: shaft wear -
SIM -- Tuesday, 22 February 2005, at 12:08 p.m.

Re: shaft wear -
Capt. Dave Kosh -- Tuesday, 22 February 2005, at 12:27 p.m.

Re: shaft wear -
John Davis -- Tuesday, 22 February 2005, at 4:47 p.m.

Re: shaft wear -
Joef -- Tuesday, 22 February 2005, at 5:20 p.m.

Re: shaft wear -
Rawleigh -- Tuesday, 22 February 2005, at 5:21 p.m.

Re: shaft wear -
SIM -- Tuesday, 22 February 2005, at 5:58 p.m.

Re: shaft wear -
John -- Wednesday, 23 February 2005, at 1:43 p.m.