Pulley area oil leak (nose bearing)
#17
Rennlist Member
Thread Starter
Hairline crack in JB Weld around the Tom Amon collar but the collar is only wet with oil at the base. If it's leaking higher on the collar I would have expected more oil up there
#19
Rennlist Member
Thread Starter
The perfect fix would be to split the case, replace the nose o-ring and the IMS o-ring. A few weeks of my life and $$$ in parts. Instead I'm going to clean and sand the JB weld then coat it with CRC Red 340. I will replace the IMS O-ring and seal it with Threebond 1211.
Last edited by John McM; 02-14-2017 at 06:13 AM.
#20
When you say it was "completely" rebuilt that did include splitting the case right?
That leak is absolutely caused by a bad o-ring on the number 8 main and or someone
used way to much sealant and plugged the groove that relieves pressure from building up
behind the lip seal. It's the OD of the #8 bearing that aligns the case halves.
I have never had it happen in any engine I've built.
That leak is absolutely caused by a bad o-ring on the number 8 main and or someone
used way to much sealant and plugged the groove that relieves pressure from building up
behind the lip seal. It's the OD of the #8 bearing that aligns the case halves.
I have never had it happen in any engine I've built.
#22
Rennlist Member
Thread Starter
When you say it was "completely" rebuilt that did include splitting the case right? That leak is absolutely caused by a bad o-ring on the number 8 main and or someone used way to much sealant and plugged the groove that relieves pressure from building up behind the lip seal. It's the OD of the #8 bearing that aligns the case halves. I have never had it happen in any engine I've built.
#25
Rennlist Member
Thread Starter
When you say it was "completely" rebuilt that did include splitting the case right? That leak is absolutely caused by a bad o-ring on the number 8 main and or someone used way to much sealant and plugged the groove that relieves pressure from building up behind the lip seal. It's the OD of the #8 bearing that aligns the case halves. I have never had it happen in any engine I've built.
#26
Rennlist Member
Thread Starter
I wiped the pulley and intermediate shaft area this morning then returned to it after work. I was pleased to see a leak around the intermediate shaft cover, and quite a large one considering the engine hasn't been started in four days. I will put a new o ring on and seal the cover with Threebond 1211. If this turns out to be the largest leak then I will use Red 340 on top of the Tom Amon collar around the nose bearing and call this job done.
#28
Rennlist Member
Thread Starter
More confirmation this morning. Over 11 hours the leak was large enough to run down the case join and drip.
Please note that Threebond 1211 is not needed for the intermediate shaft cover in a 964. It was used in older 911 versions with gaskets. My error. However given the leaks I will be sealing the exterior of the cover with the Red Gasket 340.
Please note that Threebond 1211 is not needed for the intermediate shaft cover in a 964. It was used in older 911 versions with gaskets. My error. However given the leaks I will be sealing the exterior of the cover with the Red Gasket 340.
#30
Three Wheelin'
Great photos John. I'm following this too. I haven't taken the time to trace if my leak is from the crank or the ims, but my only engine leak is also from this area. I replaced the crank seal and the ims o-ring about 2 years ago. Mine seems to weep more when the outside temp is very cold (~freezing). I Just smeared some dc50 on the ims o-ring when I replaced it.
There are some pros over at the pelican engine rebuilding forum who may be worth checking with for ideas. I believe it was Henry at Supertec who told me that the 3.6's practically leaked as soon as the factory filled them with oil.
There are some pros over at the pelican engine rebuilding forum who may be worth checking with for ideas. I believe it was Henry at Supertec who told me that the 3.6's practically leaked as soon as the factory filled them with oil.