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01-26-2021, 10:25 AM
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#1
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Newbie
City: Huntingtown
Vessel Name: Ann Nicole
Vessel Model: Marine Trader Sundeck 40
Join Date: Jan 2021
Posts: 2
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Velvet drive issues
My Velvet drive goes into gear just fine but after a half an hour or so of running the shaft speed slows way down and eventually will stop even though the engine RPMs have not changed however it seems to work just fine in reverse
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01-26-2021, 10:50 AM
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#2
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Guru
City: Gulf Islands, BC Canada
Vessel Name: Sea Sanctuary
Vessel Model: Bayliner 4588
Join Date: Jul 2019
Posts: 5,017
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Is the oil level is good or not good, in either case the oil should be changed and look at the used oil, send a sample to a place like Blackstone for analysis. Look for water in the oil. That would suggest a heat exchanger in need of replacement.
If new oil does not help, you will most likely need to rebuild it as it then sounds like slippage. Just a wag.
Oh, and welcome to the forum
__________________
SteveK
You only need one working engine. That is why I have two.
Sea Sanctuary-new to me 1992 Bayliner 4588
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01-26-2021, 11:41 AM
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#3
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Guru
City: Oriental N.C.
Vessel Name: true heading
Vessel Model: marine trader 38 dc
Join Date: Sep 2017
Posts: 572
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they will do this if the linkage is out of adjustment. make sure the transmission is all the way in gear.
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01-26-2021, 01:24 PM
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#4
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Guru
City: Boston
Vessel Name: Adelante
Vessel Model: IG 30
Join Date: Nov 2016
Posts: 1,609
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Sounds like forward clutch plates are slipping once it gets to operating temp.
As mentioned, make sure linkage is full forward, oil is full.
Replacing clutch plates is a rebuild. Transmission must be removed, disassembled, and then rebuilt. Doable for any experienced mechanic. If you deliver to a shop you might get lucky with $750-$1250 overhaul. Price goes up if they find pitted shafts, bearings, etc.
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01-27-2021, 07:44 AM
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#5
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Senior Member
City: Baltimore, Maryland
Vessel Name: HAVEN
Vessel Model: Golden Star 35
Join Date: Jul 2013
Posts: 109
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Hiya SoWhat, "Sounds like forward clutch plates are slipping once it gets to operating temp"...is this a normal wear issue, and, are there reverse clutch plates?
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01-27-2021, 07:57 AM
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#6
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Guru
City: Brookline, NH
Vessel Name: Shalloway
Vessel Model: Defever 44, twin Perkins
Join Date: Sep 2013
Posts: 2,260
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Quote:
Originally Posted by artfulltune
Hiya SoWhat, "Sounds like forward clutch plates are slipping once it gets to operating temp"...is this a normal wear issue, and, are there reverse clutch plates?
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There are separate forward and reverse clutch plates. Is it a normal wear issue? Not really, given good oil of the proper level they last a very long time, easily 5000 hrs in trawler use. Low oil, oil contaminated with water, incorrectly adjusted shift lever can all cause the clutches to slip and once they start slipping clutch wear happens very quickly.
Ken
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01-27-2021, 08:40 AM
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#7
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Technical Guru
City: Wilmington, NC
Vessel Name: Louisa
Vessel Model: Custom Built 38
Join Date: Jan 2014
Posts: 6,194
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Do check that fwd takes lever on gear to where the detent ball clicks in.
Seen some with the wrong dipsticks, causing oil level to be low. Add half a qt of fluid and see if problem goes away.
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01-27-2021, 10:06 AM
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#8
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Guru
City: Cape Cod, MA
Vessel Name: Island Seeker
Vessel Model: Willard 36 Sedan
Join Date: Oct 2007
Posts: 1,306
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Unlikely this is the complete cause but make sure the ATF oil cooler in & out ports are pointing up in your installation. If pointing down, fluid runs out of the cooler into the transmission when you shut down giving a false high reading when stopped to check and a lower reading when running.
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01-27-2021, 11:58 AM
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#9
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Senior Member
City: Baltimore, Maryland
Vessel Name: HAVEN
Vessel Model: Golden Star 35
Join Date: Jul 2013
Posts: 109
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Hiya kchace, had no idea of a reverse plate in my drives...i.e., knowledge is power.
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01-27-2021, 12:06 PM
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#10
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Guru
City: Cape May, NJ
Vessel Name: Irish Lady
Vessel Model: Monk 36
Join Date: Dec 2007
Posts: 4,964
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Quote:
Originally Posted by Johny12b
My Velvet drive goes into gear just fine but after a half an hour or so of running the shaft speed slows way down and eventually will stop even though the engine RPMs have not changed however it seems to work just fine in reverse
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Welcome aboard!
__________________
Archie
Irish Lady
1984 Monk 36 Hull #46
Currently in Cape May, NJ
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01-27-2021, 12:19 PM
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#11
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Guru
City: Southport, FL near Panama City
Vessel Name: FROLIC
Vessel Model: Mainship 30 Pilot II since 2015. GB-42 1986-2015. Former Unlimited Tonnage Master
Join Date: Oct 2007
Posts: 4,984
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Hi Johny, hope you will stick with us and also let us know how you resolve your issue - the solution is doubtless in the preceding posts!
__________________
Rich Gano
FROLIC (2005 MainShip 30 Pilot II)
Panama City area
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