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03-06-2021, 10:02 AM
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#1
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Guru
City: Cape Cod, MA
Vessel Name: Island Seeker
Vessel Model: Willard 36 Sedan
Join Date: Oct 2007
Posts: 1,303
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Transmission cooler size
I'm beginning to think my Velvet Drive 2:1 may have too small a cooler on it. (2x6 bundle) What size is your cooler?
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03-06-2021, 10:12 AM
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#2
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Guru
City: Carefree, Arizona
Vessel Name: sunchaser V
Vessel Model: DeFever 48 (sold)
Join Date: Apr 2008
Posts: 10,179
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Brooksie
What is transmisson brand and the operating temperature (via an IR gun)?
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03-06-2021, 10:22 AM
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#3
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Guru
City: Cape Cod, MA
Vessel Name: Island Seeker
Vessel Model: Willard 36 Sedan
Join Date: Oct 2007
Posts: 1,303
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Quote:
Originally Posted by sunchaser
Brooksie
What is transmisson brand and the operating temperature (via an IR gun)?
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Borg Warner Velvet Drive 1.91:1 160 hp, no IR gun.
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03-06-2021, 10:23 AM
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#4
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Guru
City: Rochester, NY
Vessel Name: Hour Glass
Vessel Model: Chris Craft 381 Catalina
Join Date: Aug 2019
Posts: 7,538
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Definitely check fluid temperature. The max temp (as in, warning alarm and change fluid ASAP) is 190* F for a Velvet Drive. If you're well below that when working it hard, then it's got enough cooling.
The coolers on my Velvet Drive 72Cs (sized same as original) are 2x12 bundles, but my transmissions are handling a lot more power and higher RPM than yours, so it's reasonable to expect them to produce more heat.
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03-06-2021, 10:09 PM
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#5
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Guru
City: hawaii
Vessel Name: #31
Vessel Model: ex-Navy MUB 50 fish/cruise
Join Date: Aug 2013
Posts: 869
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Have you looked inside the cooler tubes?
It’s a favorite spot for debris to lodge in, especially shredded rubber impeller pieces.
__________________
You can lead a horse to water,
But you can't make him ski...
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03-06-2021, 11:35 PM
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#6
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Guru
City: .
Vessel Name: GOTCHA
Vessel Model: Hatteras 58 LRC
Join Date: Jun 2019
Posts: 1,100
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Ours are about 2x10" with good flow coming out at idle. You should have a temp and pressure installed.
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Captain F. Lee - R.P.E.
USCG 200 GT Master
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03-07-2021, 05:20 AM
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#7
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Guru
City: Carefree, Arizona
Vessel Name: sunchaser V
Vessel Model: DeFever 48 (sold)
Join Date: Apr 2008
Posts: 10,179
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Quote:
Originally Posted by Brooksie
Borg Warner Velvet Drive 1.91:1 160 hp, no IR gun.
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For many an IR gun is an essential tool. Pick a half dozen spots, shoot them routinely and a steady state will be established. Any variations will provide information as to necessary maintenance.
BTW, my Hurst transmissions read about 60 degrees F above seawater temperature.
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03-07-2021, 08:22 AM
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#8
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Guru
City: Brookline, NH
Vessel Name: Shalloway
Vessel Model: Defever 44, twin Perkins
Join Date: Sep 2013
Posts: 2,259
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Quote:
Originally Posted by sunchaser
For many an IR gun is an essential tool. Pick a half dozen spots, shoot them routinely and a steady state will be established. Any variations will provide information as to necessary maintenance.
BTW, my Hurst transmissions read about 60 degrees F above seawater temperature.
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Definitely agree with this. Checking temps when underway using a temp gun is easy, quick and can help spot problems before they become big problems. My VD CR2s run at about 140.
Ken
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03-07-2021, 07:04 PM
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#9
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Guru
City: Gibsons, B.C., Canada
Vessel Name: Island Pride
Vessel Model: Palmer 32'
Join Date: Oct 2007
Posts: 4,409
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YOu can get I.R. thermometers for less than $40. Find out what the temp is.
When was the last time your gear oil cooler was cleaned? If the oil is NOW getting a bit too warm and the last cleaning was when????? then the first thing to consider is a good cleaning. These things are often the first in line between the seacock/strainer and the raw water pump and they can get plugged by deposits and small debris that gets past the strainer.
To boot if that gear oil cooler is clogging that will reduce the entire raw water supply for the engine itself and could lead to engine overheating.
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03-07-2021, 07:37 PM
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#10
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Guru
City: Boston
Vessel Name: Adelante
Vessel Model: IG 30
Join Date: Nov 2016
Posts: 1,608
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Quote:
Originally Posted by Brooksie
I'm beginning to think my Velvet Drive 2:1 may have too small a cooler on it. (2x6 bundle) What size is your cooler?
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What would make you think that?
You can get an IR Heat thermometer for $20 on Amazon. Max temp of ATF is 190F. If you get good raw water flow you shouldn't have any problems. The body of the typical cooler is 9". Total length is 12".
Check flow out of exhaust. It should be a lot. Measure temps of transmission. If a lot of flow but high temps then disks might be slipping. You might notice an rpm drop at max rpm. If it's an ancient transmission oil pump could be worn or internal passages filled with gunk.
Start with temp measurements.
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03-07-2021, 07:58 PM
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#11
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Guru
City: Cape Cod, MA
Vessel Name: Island Seeker
Vessel Model: Willard 36 Sedan
Join Date: Oct 2007
Posts: 1,303
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Quote:
Originally Posted by SoWhat
What would make you think that?
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I am getting good seawater flow. What made me think it was that after a long trip, 10 hrs running, the transmission began to "drag" (shaft turns in neutral more than normal) plus I think a 6x2" bundle is too small for this application although my Velvet Drive manual gives no guidance.
I will get an IR thermometer
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