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Tranny Chatter 1000-1400 RPM

GAS engine, transmission and generator repair and maintenance discussion forum.
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Sadey
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Tranny Chatter 1000-1400 RPM

Postby Sadey » September 20th, 2018, 5:27 pm

Sea trial on our soon to be ours 2003 356 has a little chatter on the starboard side transmission from about 1000-1400 RPM. Goes away after 1500. Port side has no issues. Less then 250 hours on each 8.1 and almost identical hours on each. Boat ran perfectly otherwise. Thank you for any input.
Thank you for the help!

Dave & Trina

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Topic author United States of America
Sadey
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First Mate
Posts: 174
Joined: September 16th, 2018, 6:56 am
Vessel Info: Former owner of a 2003 Carver 356 with 8.1 Mercs
Agradecida
Current owner 1989 60’ Hatteras MY with 8v92 Detroit’s
Benedetto
Location: Racine Wisconsin/Ft. Lauderdale
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Re: Tranny Chatter 1000-1400 RPM

Postby Sadey » September 20th, 2018, 5:33 pm

Sorry for got to ad...if anybody has any ideas or had this issue? Owner says he has know about it since new but is totally willing to split the cost to have the marina look at it for an opinion.
Thank you for the help!

Dave & Trina

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Re: Tranny Chatter 1000-1400 RPM

Postby tomschauer » September 20th, 2018, 6:49 pm

I had the same issue but only in neutral. I was the damper plate. About a $1000.00 repair parts and labor. But verify first, it could be something more expensive.
Good luck.

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Re: Tranny Chatter 1000-1400 RPM

Postby Viper » September 21st, 2018, 7:02 am

Get someone to look at it and IMO the owner should cover the whole bill for repairs, it's still his boat and it'll still be a red flag to anyone else that's interested in the boat if you walk away because of it.

The chatter could be a number of things from the tranny to the engine. Tom is correct re the damper plate, could also be an engine runnability issue causing the tranny to react that way. Are you sure it's coming from the tranny? A broken off damper in a muffler can cause a chatter as well but because everything is in the same area, it may sound like it's coming from somewhere else unless it's obvious or you get up close and listen through a devise like a screw driver.

Keep us posted.
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Topic author United States of America
Sadey
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Posts: 174
Joined: September 16th, 2018, 6:56 am
Vessel Info: Former owner of a 2003 Carver 356 with 8.1 Mercs
Agradecida
Current owner 1989 60’ Hatteras MY with 8v92 Detroit’s
Benedetto
Location: Racine Wisconsin/Ft. Lauderdale
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Re: Tranny Chatter 1000-1400 RPM

Postby Sadey » September 21st, 2018, 10:37 am

The surveyor was fairly confident it was the tranny. The boat is brokered by Skipper Bud's in Winthrop Harbor IL so we are having one of their mechanics do a diagnostic check on the noise. I agree it's the owners responsibility to a point however it is a used boat. There are going to be some issues so I'm going to wait and see what else pops up and what the pros say about this issue before we proceed with the final purchase.

Thank you all again for the info!!
Thank you for the help!

Dave & Trina

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Re: Tranny Chatter 1000-1400 RPM

Postby Viper » September 21st, 2018, 11:08 am

For what it's worth, I'd get a third party to do the assessment so you don't have to worry about a hidden agenda on their findings. The people trying to sell her are not the ones I would have give me a report on its condition IMO, heard too many horror stories.

Hope it all works out. Keep us posted.

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Re: Tranny Chatter 1000-1400 RPM

Postby Viper » September 21st, 2018, 11:45 am

Which transmission are they; Borg Warner 72, 5000, Hurth 630/800?
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Topic author United States of America
Sadey
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Posts: 174
Joined: September 16th, 2018, 6:56 am
Vessel Info: Former owner of a 2003 Carver 356 with 8.1 Mercs
Agradecida
Current owner 1989 60’ Hatteras MY with 8v92 Detroit’s
Benedetto
Location: Racine Wisconsin/Ft. Lauderdale
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Re: Tranny Chatter 1000-1400 RPM

Postby Sadey » September 21st, 2018, 2:08 pm

Not sure which ones. How would I tell from the info sheet. They are V-drive Velvet Drive 20-04005. Does that help? I’m currently not on the boat.
Thank you for the help!

Dave & Trina
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Re: Tranny Chatter 1000-1400 RPM

Postby km1125 » September 21st, 2018, 3:19 pm

V-drives in a 356? I thought they were all straight shafts?
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Topic author United States of America
Sadey
First Mate
First Mate
Posts: 174
Joined: September 16th, 2018, 6:56 am
Vessel Info: Former owner of a 2003 Carver 356 with 8.1 Mercs
Agradecida
Current owner 1989 60’ Hatteras MY with 8v92 Detroit’s
Benedetto
Location: Racine Wisconsin/Ft. Lauderdale
Has thanked: 4 times
Been thanked: 29 times

Re: Tranny Chatter 1000-1400 RPM

Postby Sadey » September 21st, 2018, 4:56 pm

Maybe they meant V as in Velvet. They are straight shafts.
Thank you for the help!

Dave & Trina

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