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Shaft Wobble/packing |
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mdvalant 
Grand Poobah 
Joined: May-06-2009 Location: Bellevue, IA Status: Offline Points: 2059 |
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 Topic: Shaft Wobble/packingPosted: May-10-2010 at 5:12pm |
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Hey gang,
My buddy bought a 91 ski off CCFAN in 08. Nice boat, 900 hours. Last year he drilled a rock with it. Bent his strut a smidge (required replacement) and destroyed his prop. We put a new strut on it, new prop, still runs great. We water tested it for the first time since the rock incident the other day and to be sure everything was ok I popped the cap out of the floor to watch the shaft spin and noticed a lot of water dripping (more than the 1 or 2/min). I told him to take it up a little and water started to spin around with the spinning shaft. Also, it has an ever so small wobble like the shaft could possibly be bent (which I'm sure is possible). We ran it and watched it for some time and it seemed ok but wondering what he's going to be looking at for long term damage. Thoughts? |
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storm34
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Joined: November-03-2008 Location: Dexter Iowa Status: Offline Points: 4492 |
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Posted: May-10-2010 at 5:18pm |
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5-6 drips/min is desired. Did he replace the packing?
I'm no help at diagnosing a bent shaft |
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mdvalant
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Joined: May-06-2009 Location: Bellevue, IA Status: Offline Points: 2059 |
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Posted: May-10-2010 at 5:21pm |
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1-2/5-6 whatever, this things a river. haha
We were out for about an hour though and there was hardly any water in the boat so I don't know.... He did NOT replace the packing. I know little about that part of inboards. Never had to touch it on the '90 so never learned about it...precisely why I'm here :) |
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behindpropeller
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Joined: July-31-2006 Status: Offline Points: 1810 |
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Posted: May-10-2010 at 5:23pm |
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Did you check the shaft when you replaced the strut?
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mdvalant
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Joined: May-06-2009 Location: Bellevue, IA Status: Offline Points: 2059 |
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Posted: May-10-2010 at 5:25pm |
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By checking the shaft do you mean with some sort of shaft checking device that I am unfamiliar with? We spun it and looked at it and it "looked" very straight. Now, as far as exact measurements go, no, we don't have that.
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storm34
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Joined: November-03-2008 Location: Dexter Iowa Status: Offline Points: 4492 |
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Posted: May-10-2010 at 5:37pm |
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Some reading material for ya packing
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mdvalant
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Joined: May-06-2009 Location: Bellevue, IA Status: Offline Points: 2059 |
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Posted: May-10-2010 at 5:39pm |
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Damn, this isn't even my boat we're talking about Chris! haha
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8122pbrainard
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Joined: September-14-2006 Location: Three Lakes Wi. Status: Offline Points: 41045 |
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Posted: May-10-2010 at 5:41pm |
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Mike,
Checking for a bend forward of the strut is pretty easy. It's part of the alignment proceedure. Take a look at Eric's alingment thread and it explains it. Basically you keep the trans coupling half stationary and rotate the prop shaft side. If it's bent, then you'll see a difference in the gap between the coupling and it will follow the rotation of the prop shaft. Aft of the strut is easy too but you need a dial indicator. It's clamped off to the strut, the measuring tip is placed on the prop taper and then the shaft is rotated. Anything past about a .002" runout and you'll have to pull the shaft and ether replace it or have it straightened. BTW, why didn't your friend have the strut straightened? If the shaft is bent, you'll nver get the stuffing box to hold out the water. I suggest checking the shaft before a repack. |
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mdvalant
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Joined: May-06-2009 Location: Bellevue, IA Status: Offline Points: 2059 |
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Posted: May-10-2010 at 5:45pm |
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Thanks 8122, all good points. Why didn't he have the strut straitened? Is that possible? That thing is solid...
He turned it into insurance and we got the strut at cost thanks to marina friends...but now that I think about it, since he turned it into insurance why didn't he just have someone throw a new shaft in it...I'll have to ask him what his method behind his madness was there. |
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8122pbrainard
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Joined: September-14-2006 Location: Three Lakes Wi. Status: Offline Points: 41045 |
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Posted: May-10-2010 at 6:03pm |
You haven't been spending enough time nor doing a searches on CCfan!  Prop shops do it. They are experts at bending brass alloys. Chris (SNobsessed) did his own in a arbor press.
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mdvalant
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Joined: May-06-2009 Location: Bellevue, IA Status: Offline Points: 2059 |
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Posted: May-10-2010 at 6:07pm |
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haha Sorry, I have failed. I thought I was doing a pretty good job at following the threads, I mean I'm on here like 8-5 Monday-Friday, oddly enough, those are the same hours I'm at work!
Well, again, he turned it into insurance so, the easiest thing to do was buy a new one... |
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mdvalant wrote: