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Old 03-08-2005, 01:18 PM
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jayderwin1 jayderwin1 is offline
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slight knocking sound coming from the shaft

has any one ever heard a slight knocking sound coming from some where around the shaft area when the boat is in gear at low RPMs?
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Old 03-08-2005, 01:38 PM
Brn85ss Brn85ss is offline
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Probably your dampner plate.If it goes away at higher rpm in gear thats probably it.Doing mine this spring should only take an hour or two.
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Old 03-08-2005, 01:48 PM
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jayderwin1 jayderwin1 is offline
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can you explain what a damper plate is and does? mine will knock at the slowest RPM i can go in gear as soon i give it a little more gas the noise will go away.
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Old 03-08-2005, 01:57 PM
Brn85ss Brn85ss is offline
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Someone else might be able to explain this better than I, but here it goes.The dampner plate filters out the harmonic vibrations of your drive train when the springs start to wear or break that is the sound or rattle you here.Should be replaced right away so it does not put extra strain on the trans.Also if you have a slight miss in your engine it will sometimes make your dampner rattle.I'd make sure your engine has a full tune before your sure it's the plate.Chased this in my buddy's malibu,all it needed was a tune.Skidim has them for about 90.00.
Also it could be something else but this is pretty common problem,try to isolate the rattle.

Last edited by Brn85ss; 03-08-2005 at 02:02 PM.
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Old 03-08-2005, 02:04 PM
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jayderwin1 jayderwin1 is offline
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is this plate located in the transmission? my engine also might have a slight miss but very slight if it does.
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Old 03-08-2005, 02:28 PM
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Good Info. Our CC has been doing this for several years and runs great even though the motor has a zillion hours
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Old 03-08-2005, 02:28 PM
Brn85ss Brn85ss is offline
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The plate is in the bell housing,all it takes is a slight miss.
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Old 03-08-2005, 02:29 PM
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What is you idle speed?
Mine had a simular rattle, kicked up the idle about 100 rpm and it went away.
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Old 03-08-2005, 02:34 PM
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martini martini is offline
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The plate is attached to the flywheel. It is between the transmission and the engine. The cast iron part(BELL HOUSING) that is between the engine and the transmission, is where you'll find the damper plate. Replacement requires lifting the rear of the engine a little to gain access to everything. An engine hoist should be used.
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Old 03-08-2005, 03:35 PM
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jayderwin1 jayderwin1 is offline
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my idle speed is about 600 i goes up and down with how long the motor has been running.
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