TRNW-2: VW O9G mysterious leak

[Donald Day]

If bell is porous clean good then coat with epoxy 


Sent from the all new AOL app for iOS


On Tuesday, December 16, 2025, 10:24 AM, Steve Everett via trnw2 <trnw2 at trnw.net> wrote:

  I have an 09 Jetta with a O9G , originally built at another shop, 2 months after being built it had a small leak from inside the bellhousing, small enough that sitting running after 5 minutes there will be one drop at the inspection hole at the bottom of the bellhousing,  when you look up inside that hole the fluid seems to be seeping from the right side up inside the bell,  we pulled the unit, and fluid appeared to be coming from around the uppermost bolt on the right side,  (red dot in picture attached)  I removed the bellhousing, cleaned everything, resealed the bell and used silicone on all the bolts,  reinstalled unit and still had the leak,  pulled again,  this time I thought maybe the case was porous in the are above and to the left of the bolt, as fluid appeared to be in that area,  I cleaned everything with brake clean, coated that area with JB weld, resealed the same bolt again, installed a different converter,,,  installed unit,    same leak again,        took a week or so for us to find another unit,  removed bellhousing from core unit, cleaned and resealed everything related to the different bellhousing,   reinstalled,   still have same leak,  
  Different bellhousing, changed attaching bolts the last time around, using ultra grey silicone to seal everything,  plenty of silicone on all the bolts, changed converters once, ( fluid is not all over inside of bellhousing , only on right side, so I don't believe its converter related) 
  only explanation would be two different bellhousing being porous in same area ?    in the picture attached the fluid originates in the area where the red dot is 
 Anyone ever seen something like this ? 
   SteveThis message was sent from the TRNW Technical Discussion Forum (trnw2). You were sent this message because you have subscribed to our mailing list. If you don't want to receive these emails from TRNW in the future, please unsubscribe here:
https://www.trnw.net/unsubscribe.php?forum=2
TRNW Inc., 2825 Walnut Terrace, Modesto, CA 95355


-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.trnw.net/pipermail/trnw2/attachments/20251216/603a19aa/attachment-0001.html>