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Clashing Noise in Lower Unit - need some advice
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shooter
MMT Pro Member
Joined: Wed Jul 21, 2010 5:59 pm Posts: 406
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 Clashing Noise in Lower Unit - need some advice
First happened after hitting a log or something, thought maybe the stinger on the skeg got bent up into prop area but that was clear. Prop spins by hand fine but when the clutch is engaged it may spin for a few seconds but then there is a clashing sound and the engine dies. Got home and took it apart from the knuckle joint on down. All bearings turn smoothly, no evidence of any damage (no metal chips, no damage to gears). Reassembled and ran it today, same issue so I figure problem must be in the upright section of the lower. Took the lower end completely apart today. It does feel like the bearing is a little scratchy, other than that everything seems OK. I don't understand how something that seems so minor can be causing this major failure. Am I missing something? Is there some kind of alignment that I need to do? Can the upright section be disassembled? Can I get parts anywhere besides PD? Any help would be appreciated.
_________________ 32 PD with EVT cam, decked heads, shaved pistons and not enough sense to leave things alone!
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Sat Dec 19, 2015 9:24 pm |
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duckduckboom
MMT Elite Member
Joined: Tue Nov 23, 2010 6:33 pm Posts: 5603 Location: Corner of Hell an high water, La
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 Re: Clashing Noise in Lower Unit - need some advice
need to take apert the clutch and inspect it, also the shaft collar that attached to it
_________________ You have your whole life to be an idiot, take a day off!
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Sat Dec 19, 2015 9:38 pm |
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shooter
MMT Pro Member
Joined: Wed Jul 21, 2010 5:59 pm Posts: 406
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 Re: Clashing Noise in Lower Unit - need some advice
Can do, ddb, but what am I looking for there?
_________________ 32 PD with EVT cam, decked heads, shaved pistons and not enough sense to leave things alone!
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Sun Dec 20, 2015 12:52 am |
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duckduckboom
MMT Elite Member
Joined: Tue Nov 23, 2010 6:33 pm Posts: 5603 Location: Corner of Hell an high water, La
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 Re: Clashing Noise in Lower Unit - need some advice
Bent, broken bands in the clutch. Any exposed copper wire from inside the clutch. I belite this is where your problem will be.
If those bands bend or break they will be out of balance. Once they get out of balance they start rubbing the rubber coating off of the electromagnet's coil. Once that happens the next time that band hits your coil it grounds the motor out. I have seen it where it kills the engine but never blows the fuse.
_________________ You have your whole life to be an idiot, take a day off!
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Sun Dec 20, 2015 8:19 am |
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shooter
MMT Pro Member
Joined: Wed Jul 21, 2010 5:59 pm Posts: 406
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 Re: Clashing Noise in Lower Unit - need some advice
Well, clutch looks fine and all the parts of the lower unit seem like they are OK too.
The shaft collar the meshes with the splines of the lower unit looks like it has seem better days. The recent breaks in the peaks of the splines inside the collar tell me this is new damage, and though I don't know what this part looks like new I can't believe the features would be so poorly defined.
I'm surprised that the two parts don't overlap more than what they appear to do, based on the location of the new breaks.
Anyone got one they can spare?
_________________ 32 PD with EVT cam, decked heads, shaved pistons and not enough sense to leave things alone!
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Mon Dec 21, 2015 9:21 pm |
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