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Thread: Transmission noise
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04-09-2007, 04:37 PM #1
Transmission noise
I have a 92 Boomerang with a PCM 1:1 transmission. I am getting a knocking noise coming from the transmission area when I put the boat in gear. No noise when its in neutral but when I put it in gear at idle it starts knocking. When I rev the throttle the noise seems to pretty much go away. It does it in forward and reverse.
Any ideas on what this could be?
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04-09-2007, 06:13 PM #2Senior Member
- Join Date
- Dec 2006
- Location
- Thomasville, GA
- Posts
- 198
Mine did that only at idle though. Check the strut bushing/bearing.
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04-09-2007, 09:00 PM #3
The strut bushing? Where exactly would I find it?
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04-09-2007, 09:02 PM #4
Re: Transmission noise
Originally Posted by cham783
It's most likely your dampner plate. This is where the transmission input shaft connects to the back of the engine. These are designed to take up the vibrations from the engine at idle and to absorb the shock of going into gear. When the springs get worn they cannot absorb the vibration and that is the noise you most likely hear. This needs to fixed soon or the vibration will cause the pump bearing to migrate messing up the pump, bearing, and seals. The noise goes away above idle because the hub is forced against the plate. Easy fix if you only have to replace the dampner.(stillhave to pulllthe transmission) Hope you caught it early.
How do I know? similar experience on my 87 Nautique, hope this helps.
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04-10-2007, 06:45 AM #5
Oh boy - fun fun fun. I can't wait to pull that trans out again!
The dampner plate, is that part of the transmission or the thing inside the bell housing where the shaft connects to the engine?
I haven't run it except in the yard so hopefully it hasn't done any other damage.
Thanks for the help.
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04-10-2007, 08:38 PM #6Senior Member
- Join Date
- Aug 2006
- Location
- Millington TN
- Posts
- 204
Originally Posted by cham783
Engine Nut
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