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post #11 of 16 Old 04-07-2019
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Re: Replacing transmission oil cooler

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Originally Posted by boatpoker View Post
I recently replaced my gear fluid cooler as it had sprung a leak. I spent quite a few hours building a new mounting location for it as it partially blocked other
items that needed more regular maintenance.

Proud of my work I sat back and it dawned on me..... my HT6-354 Perkins didn't have one and I put 20,000 hours on that boat. My TAMD60B didn't have one and I put 6,000 hours on that boat. Now those are big heavy duty diesels. If their tranny's didn't need cooling why should this puny little 55hp Westerbeke ?

PS. The Perkins had the exact same transmission as my little Westerbeke. I am going to seriously look into removing this cooler altogether. I don't think it was OE.
As I understand it, sailboat transmissions are often undersized, for the loads, as they are expected to run intermittently. Our weight and horsepower are at the absolute top of the range, for our hurth gear model, for intermittent recreational use. For constant industrial use, the maximum HP drops in half and our gear would be grossly undersized. I suspect the gear is actually working harder and heating more than itís larger stinkpot breatheren, ie the need for the cooler.


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post #12 of 16 Old 04-07-2019
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Re: Replacing transmission oil cooler

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Originally Posted by Minnewaska View Post
As I understand it, sailboat transmissions are often undersized, for the loads, as they are expected to run intermittently. Our weight and horsepower are at the absolute top of the range, for our hurth gear model, for intermittent recreational use. For constant industrial use, the maximum HP drops in half and our gear would be grossly undersized. I suspect the gear is actually working harder and heating more than it’s larger stinkpot breatheren, ie the need for the cooler.
I don't know, you may be right in general. I do have a couple of gear specialist contacts I'm going to talk to.

But in my specific instance given that I got 20,000 hours out of a 72C Velvet drive on a 165hp Perkins without a cooler. I don't see why the same transmission running at the same RPM would would need one on a 55hp Westerbeke
.

The hysterical laughter you hear as you drive a way in your"new" boat ..... is the seller.

Last edited by boatpoker; 04-07-2019 at 05:13 PM.
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post #13 of 16 Old 04-10-2019
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Re: Replacing transmission oil cooler

The Velvet Drive 72C always has an oil cooler fitted to the system. This is quite normal and every transmission shop and marine mechanic will agree with this.

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post #14 of 16 Old 04-10-2019
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Re: Replacing transmission oil cooler

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The Velvet Drive 72C always has an oil cooler fitted to the system. This is quite normal and every transmission shop and marine mechanic will agree with this.
My Perkins HT6-354 with over 20,000hrs on it and which I rebuilt and maintained myself over 20yrs. did not have a gear cooler on the 72C. I never had a gear problem and don't think I could have overlooked a cooler when I pulled the engine.
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post #15 of 16 Old 04-10-2019
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Re: Replacing transmission oil cooler

I've never seen a Velvetdrive without a cooler usually bolted on with the same bolts for the bell housing adapter plate .It gets it's oil from the gerotor pump on the front input shaft. Gear is prone to overheat if driven by tailstock(under sail) or the pump fails. Then the plates whorp and you're stuck in gear,maybe both F and R at the same time which prevents the starter from working until things cool down. .
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post #16 of 16 Old 04-18-2019
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Re: Replacing transmission oil cooler

The attached photo shows Boatpoker's engine with an arrow pointing to the transmission oil cooler.
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