TRNW-2: VW O9G mysterious leak

[Steve Everett]

 When I resealed everything the first time I replaced the front seal and
the o-ring around the pump,  just to make sure that wasn't a factor,
although there was no fluid around either of those areas,  I originally
thought the previous builder didn't seal the bolts good ?   I will get
another converter this time around though.

    Steve

On Tue, Dec 16, 2025 at 11:42 AM Chris and Cathy Kershaw <
kershawservicesllc at gmail.com> wrote:

> We recently had an Acura and a Nissan with small leaks in the bellhousing.
> Both had to be driven several miles and left idling for drops to appear on
> the ground.
>
>  I would have sworn leaking around bolts when they were back out but ended
> up being the converter weld on both. I know you already replaced the
> converter just wanted to say oil can do funny things inside a bellhousing.
> What about the pump itself?
>
>
> On Tue, Dec 16, 2025 at 10:25 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 ?
>>
>>    Steve
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>
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