Boats For Sale:
Alignment...but now Thud, Thud |
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Hollywood 
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Joined: February-04-2004 Location: Twin Lakes, WI Status: Offline Points: 13514 |
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 Posted: November-07-2008 at 4:56pm |
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^^^ I think that's what's up with Johnny's BFN. It is in storage now anyways. We can talk about it on Monday.
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eric lavine
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Joined: August-13-2006 Location: United States Status: Offline Points: 13413 |
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Posted: November-07-2008 at 4:23pm |
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it means the springs have no load and are loose possibly causing the thump, imagine with mis-alignment it is harder to turn the input shaft causing load to the plate because it is harder to turn (pressure) and when you bring it back into alignment that load pressure is removed allowing the springs loosen and thump or rattle the guts of the trans. the cure is replacing the damper including aligning the damper when installing, which means putting the trans on the bellhousing first and the bellhousing to the engine and then tightening the damper plate bolts last. by this method you are using the transmission as a means to center the plate onto the flywheel which eliminates side load of the input shaft
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"the things you own will start to own you"
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Hollywood
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Joined: February-04-2004 Location: Twin Lakes, WI Status: Offline Points: 13514 |
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Posted: November-07-2008 at 1:17pm |
So this means what? Why is the damper making noise and what is the fix? |
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JoeinNY
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Posted: November-07-2008 at 12:27pm |
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Strut does looked tweeked from that angle but it might be the curvature of the back of the strut that makes it look that way. We are going to need a dead on down the back shot to know for sure.
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boat dr
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Posted: November-07-2008 at 11:53am |
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Been on a mission,trying to rat hole dollars before the season ends.
Have been on the site lurking, but nothing that needs my opinion nor the little knowledge I possess..Boat dr |
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eric lavine
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Posted: November-07-2008 at 11:42am |
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back from the dead....I was beginning to think...boat doctor who?
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"the things you own will start to own you"
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boat dr
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Posted: November-07-2008 at 10:59am |
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I may not be the shapest tool in the shed , but does the strut look to be a bit "tweeked"?
It would be real hard to get a proper fit at the coupling with the components now being used. Before we go talking dampners or tranny problems should we not addess the strut issue first? |
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SNobsessed
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Posted: November-07-2008 at 10:51am |
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I second Eric's vote on the damper. As long as you are taking the drive line apart apart, pull the tranny & put a new damper in. They are less than $100, & will save your tranny in the long run (sorry to discourage business Eric).
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“Beer is proof that God loves us and wants us to be happy.”
Ben Franklin |
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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: November-07-2008 at 10:30am |
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Court,
I feel Eric's on to the "thud"!!! Do check the coupling fit too. |
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eric lavine
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Posted: November-07-2008 at 10:12am |
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Now that you took the load off of your prop shaft, the damper too has less load and this may be the noise you are hearing, a matter of fact I would bet on it
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"the things you own will start to own you"
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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: November-07-2008 at 8:23am |
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Court,
Yes, it's time for new hose clamps. Chris's idea of cutting them off is really the easy way. Even a little Dremel tool with the little friction blade (parting tool) will work. From the picture, it does look like the shaft through the cutlass is angled up towards the bow. Your're getting the front of the shaft free to check is a step in the correct direction. The "thud" - What's the fit like on the shaft coupling? How bad was the engine/shaft alignment? Looks to me like you may have a case of fretting. This is wear in the bore of the coupling caused by movement of the shaft inside the coupling. Misalignment is the cause. Did you put the stainless bolt in the coupling? looks like someone is trying to keep the shaft coupling tight after it loosened up or lost a set screw. The shaft to coupling needs to be a interference fit. (.000" to -.001") Getting back to the Dremel, it's really the "homeowners" version of a die grinder. I never though very much of them as being a decent tool to have in the shop. Got one and found it to be very handy especially in tight spaces. Our tool makers here at the plant even have them!! |
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DrCC
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Posted: November-07-2008 at 1:52am |
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Looks like your prop is part of the vibration problem.
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SNobsessed
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Posted: November-06-2008 at 11:58pm |
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Looks like the bolt head is broken off. If it was me I would cut the clamp with a parting wheel. But maybe you can just pry it apart at the screw joint.
PS -In case this is unfamiliar to others, a parting wheel is an abrasive disc that cuts by the edge. Usually used with a air powered die grinder. Die grinders are not very expensive & I use mine quite often. |
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“Beer is proof that God loves us and wants us to be happy.”
Ben Franklin |
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CCFcourt
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Joined: October-04-2008 Location: United States Status: Offline Points: 44 |
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Posted: November-06-2008 at 11:34pm |
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I performed an alignment for the first time on the Southwind based on guidance from this site. Boat performs noticeably better - much less vibration and better response.
After the boat is good and warmed up I now hear a rapid thud, thud, thud when the boat is in gear that I don't hear until I've used the boat (screamed up and down the lake - good and warmed up). The noise is only present when in gear. I reread alignment posts and am thinking that my shaft is riding too high towards the front of the strut (looks like it could possibly rub). Based on readings, I'm trying to get the rubber hose off the log so that I can see better how the shaft is centered (or not) entering into the boat. The clamps for the hose are old and don't appear to be regular screws. I can't figure out how to turn them since they are more like dirty nubs than anything (no screw head). See picture: 
Am I going down the right path? 
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Ski Nautique 94
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eric lavine wrote: