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| Shaft wobble...alignment? |
| Author |
Message |
    
Mark Petitt
Member
Username: firepiper
Post Number: 33
Registered: 11-2006
| | Posted on Monday, November 02, 2009 - 04:45 pm: | 
|
Hello, question on shaft alignment. I have a vibration and small wobble at the stufing box of my strboard engine. Been there for as long as i have had boat. I've replaced the coupler, and cutlass bearing, still there. Then i had the props checked, still there. With boat on the hard now, I was going to send the shaft out and have it checked for straightness. So, today, when I disconnected the coupler, i found that it wanted to sit lower than it was when mated up. It turns much easier if i lift it up a hair and turn it. This would make me think alignment, ( which I've done sevral times). Do you think I would get a visable wobble at the stuffing box from bad alignment? It is more noticable at slower speeds. I go 20-30 miles across the bay to fish, at cruising speed, I really can't feel it. Any thoughts? |
Rick Sweeten
Senior Member
Username: linesix
Post Number: 1622
Registered: 11-2002
| | Posted on Monday, November 02, 2009 - 05:59 pm: |
|
Sure, even more if you have an intermediate strut or a bearing in the shaft log. Have you checked the transmission output flange for trueness? |
capemaydiamond
Member
Username: capemaydiamond
Post Number: 6
Registered: 09-2009
| | Posted on Monday, November 02, 2009 - 08:36 pm: |
|
i think it will do that because when you are on dry dock the fiberglass flexes from the weight and the shaft will not line up properly because of that. i had that problem with my boat. the alignment won't be correct unless the boat is in the water at least that's what i was told when it comes to the larger boats |
makomark
Senior Member
Username: makomark
Post Number: 1811
Registered: 09-2008
| | Posted on Monday, November 02, 2009 - 10:14 pm: |
|
Its normal for the alignment to change after a haulout. The hull isn't floating, it is blocked.
You may want to check the position of the shaft in the log, with the couplers mated (not bolted). If it is more than that "hair" off center, in the corresponding direction, that will cause a wobbling stuffing box. |
Fastjeff
Senior Member
Username: fastjeff
Post Number: 7068
Registered: 09-2003
| | Posted on Tuesday, November 03, 2009 - 05:57 am: |
|
A word on coupler alignment: If that sucker goes on the shaft crooked--which is not hard--then the best alignment in the world is useless.
Learned this the hard way. I too had a wobble, so I pulled everything out. The tradintional "roll the shaft on the garage floor" test said it was straight, so I started looking elsewhwer. My machinist cleaned up both ends of the shaft, then faced off the coupling flange as well. Now I had a flat, straight and true surface to work with.
Also, as capemaydiamond said, alignment on the hard is inaccurate--especially for a fiberglass boat. I suggest you pull the shaft and go through my excercise (as described above). Then, after aligning her in the weater, you'll be all set.
Jeff |
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