Knocking comming from Drive area
Printed From: CorrectCraftFan.com
Category: Repairs and Maintenance
Forum Name: Boat Maintenance
Forum Discription: Discuss maintenance of your Correct Craft
URL: http://www.CorrectCraftFan.com/forum/forum_posts.asp?TID=2257
Printed Date: September-27-2024 at 5:04pm
Topic: Knocking comming from Drive area
Posted By: 80nauts
Subject: Knocking comming from Drive area
Date Posted: August-15-2005 at 8:00pm
When I first put my boat in the water and idle in gear then I hear a slow knocking sound till I take off. When the boat warms up the noise is gone. Any ideas on how to find out what is going on?
The transmission seems to be running smooth and the sound seems to be inbetween the trans and prop area. The prop is tight.
Thanks for any Ideas...This website is great.
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Replies:
Posted By: ultrahots
Date Posted: August-16-2005 at 1:29am
Coupler between motor and trans ? I have seen a few make noises in the past.When you load the boat the noise goes away.
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http://www.correctcraftfan.com/diaries/details.asp?ID=6960&sort=&pagenum=2&yrstart=1986&yrend=1990" rel="nofollow - 1980 Show Nautique
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Posted By: GottaSki
Date Posted: August-16-2005 at 9:28am
And most velvet drives knock if the idle is too low or eratic, it doesn't take much.
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"There is nothing, absolutely nothing, half so much worthwhile as messing around with boats...simply messing."
River Rat to Mole
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Posted By: mackwrench
Date Posted: August-16-2005 at 12:51pm
Sounds like the engine/trans coupler is bad.
This subjuect has come up a few times here and thats the common cause...
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NO LONGER A MEMBER
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Posted By: Guests
Date Posted: August-19-2005 at 3:36pm
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damper plate? is that the coupler?
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Posted By: mackwrench
Date Posted: August-19-2005 at 4:30pm
correct
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NO LONGER A MEMBER
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Posted By: 80nauts
Date Posted: August-20-2005 at 4:35am
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I replaced one of those on a friends boat. I hope it doesn't mean it will fail. I just don't want to be stuck on the lake somewhere.
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Posted By: Guests
Date Posted: August-22-2005 at 4:38pm
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is there an old thread or online guide about changin the damper plate? I think my boat needs one two. look like a big job to seperate the tranny.
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Posted By: 80nauts
Date Posted: August-23-2005 at 8:58am
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I upped the idle a little bit and the knocking is all but gone. I guess it is just noisy at a low idle. I wonder if it has something to do with a relationship between centrifical force or whatever and engaging completely into drive.
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Posted By: tommer12
Date Posted: September-16-2005 at 11:04pm
If it's a velvet drive, it's probably the damper plate between the tranny and the engine. There are 4-5 springs around the plate that rust out over time. I had mine replaced on my old 84' for about $500 a dealer. PCM makes a replacement plate for about $150, then the rest is labor. Pull the tranny out, pop the old plate, put the new plate on, reinstall tranny.
there is another thread here on it.
cheers
tc
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Posted By: Bob's2001
Date Posted: September-17-2005 at 8:42pm
Mine was knocking like that just before it quit. It felt a little stiff going into gear that day and just quit going while I was up on ski. At least we all got a turn before it quit. I'm pulling the trans to see what's broke.
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Bob Ed
83 2001
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