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Old 07-26-2012, 01:36 PM   #1
Jacques's Avatar
City: Québec City
Vessel Name: "Côte de Nuits"
Vessel Model: Marine Trader 36 Sundeck
Join Date: Sep 2011
Posts: 19
Size plug on Velvet drive transmission with Ford-Lehman

I have a Ford-Lehman 135 with a Velvet Drive transmission
Model 1017010 Serial number 13274 (or A) Ratio 2.10: 1

I installed an oil change system (Groco) with three valves for the engine, generator and transmission.

Where does it connect to drain the transmission?
I suppose on the starboard side there is a plug.
In this case, what is the size (diameter) of this plug for the connection?

Of course I could have my answer by removing the plug, but I should remove the oil before!

I asked Bob Smith, but I have not had a reply.

Thank you for your help!


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Old 07-26-2012, 02:40 PM   #2
skipperdude's Avatar
City: Whittier AK
Country: USA
Vessel Name: Apache II
Vessel Model: 1974 Donald Jones
Join Date: Oct 2007
Posts: 3,147
There should be a plug on the bottom.
That is where you will get all the oil out.

Did the same thing on my CAT 3208 Twin Disc 506 The plug was on the bottom where an oil drain should be.

If you can't repair it maybe it shouldn't be on the boat
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