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Old 01-12-2018, 10:56 AM
Captnshipwreck Captnshipwreck is offline
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Boat: 1985 Stars and Stripes
Location: Midwest
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85 S&S Drive Train Noise

Hey guys. Have an 1985 Stars and Stripes w/ Powerslot trans. The issue I have is when I engage the trans their is a clunking kind of sound until I put it under load.

Basically if Iím trying to pull from a dock in a slow manner it makes this noise. Once I get the RPMS up and speed on it it goes away. At first I thought maybe the prop was loose and the load was pushing it away from the drive shaft causing the noise to go away but no luck. This happens in both forward and reverse.

Anyone have any thought on this? Maybe drive shaft alignment, but I would think it would be a continuous noise if the drive shaft.

Thanks for any input you can give.

Is it summer in the Midwest yet?
Lou
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Old 01-12-2018, 11:48 AM
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Covi Covi is offline
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Boat: 2008, PS 197, LY6
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What’s it idling at? What’s the idle when clicked into gear?
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86' 19 Skier, 351 PCM (sold)
2008 197 ProStar, LY6
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Old 01-12-2018, 11:54 AM
james_shoemaker james_shoemaker is online now
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Join Date: Dec 2017
Boat: Mastercraft 1982 351 Powerslot Stars and Stripes
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My 82 did this when I had an idle surge from spark plug and carb issues. Once I resolved those issues and got a smooth idle, the sounds went away.
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Old 01-12-2018, 12:55 PM
Captnshipwreck Captnshipwreck is offline
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Thanks guys. Honestly not sure what itís idling. Itís winter here so itíll be a minute before it gets fired up. Any thoughts on where it should be around?
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Old 01-12-2018, 01:08 PM
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Covi Covi is offline
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I had a noise once come from transmission also. It was from a low idle. Once idle was corrected noise went away.

I think? Could be right, could be wrong, could be real close.

At idle 650, in gear 700-750. In gear maybe as high as 800-850.

I wish I could remember.
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2008 197 ProStar, LY6
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Old 01-12-2018, 01:23 PM
waterlogged882 waterlogged882 is offline
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Typically the noise is from the springs on the damper plate assembly.

If you take it apart, go ahead and put a rebuild kit in it. Easy enough. Plenty of info. here on the forum. Do a search and find everything you need to know; troubleshoot, resolution, and rebuild job steps/ tutorials. It's all here.
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Last edited by waterlogged882; 01-12-2018 at 02:23 PM.
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Old 01-12-2018, 04:41 PM
Captnshipwreck Captnshipwreck is offline
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Boat: 1985 Stars and Stripes
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Thanks guys! All of the help and insight is greatly appreciated
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