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 Mb 37efi HDR trans leaking oil 
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MMT Member

Joined: Tue Mar 28, 2017 3:45 pm
Posts: 5
Post Mb 37efi HDR trans leaking oil
Ok here goes,,,
Have 37hdr efi mb-sd , have had a lot of issues,, most corrected via mb sends parts & I myself repair, all under warranty,,closest repair shop that I trust is 8 hrs away,,,,
To get right to point,,, replaced all trans gear assembly and all seals & etc.,,,
Every time I test drive after repair , gear assembly loses its 1.5/2.0 oz of 10w30 oil,,,

Take cover off , verify trans lost its oil,,, but no evidence of bad seals,,,no leak found, other than all in bottom of drive housing


Noticed out on test run the clutch cover gets very hot to the touch,(normal?) could ring seals be heating up, leak oil, then cool after shutdown off motor &return to original intended use ?

Trying to find someone that can shed a little light on this,,,
Trying to find someone that knows this drive/trans sys very well

Please keep sour suggestions /comments away,,,


Thu Jul 06, 2017 4:51 pm
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MMT Member

Joined: Tue Mar 28, 2017 3:45 pm
Posts: 5
Post Re: Mb 37efi HDR trans leaking oil
No suggestions ?
Can i really have only one ever to do this ?
Kinda crazy


Mon Jul 17, 2017 8:35 pm
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MMT Sponsor

Joined: Fri Jan 10, 2014 1:16 pm
Posts: 2107
Location: Gladewater TX
Post Re: Mb 37efi HDR trans leaking oil
There is only a few places it can leak. If it was in front of me i could find it. You have to look at the smallest things. The surfaces where the seals ride. Anything not perfect on the back sides of seals, did the backs get a small calculated amount of rtv in the right spot, anerobic sealer in the right spot, threads sealed. Orings perfect. Fluid running up crankshaft where you can't see it.. just ideas here


Mon Jul 17, 2017 8:58 pm
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