Pulley area oil leak (nose bearing)
02-18-2017, 09:50 AM
#31
It is absolutely not SOP to put RTV or anything on the outside of the case during a rebuild.
The fact that it seems like it pushes the stuff out makes me think they may also have put
goop in the bore of the case and blocked the passage that relieves oil pressure behind the seal.
And I could be wrong but it looks like there are small divots in the IMS cover-a sure sign of
heavy handed work which might also indicate damage to the o-ring there. You should not
need to use any sealant there but remember to make sure there are no nicks in the case halves
that could nick the o-ring on installation.
The fact that it seems like it pushes the stuff out makes me think they may also have put
goop in the bore of the case and blocked the passage that relieves oil pressure behind the seal.
And I could be wrong but it looks like there are small divots in the IMS cover-a sure sign of
heavy handed work which might also indicate damage to the o-ring there. You should not
need to use any sealant there but remember to make sure there are no nicks in the case halves
that could nick the o-ring on installation.
02-18-2017, 02:16 PM
#32
Rennlist Member
Thread Starter
It is absolutely not SOP to put RTV or anything on the outside of the case during a rebuild. The fact that it seems like it pushes the stuff out makes me think they may also have put goop in the bore of the case and blocked the passage that relieves oil pressure behind the seal. And I could be wrong but it looks like there are small divots in the IMS cover-a sure sign of heavy handed work which might also indicate damage to the o-ring there. You should not need to use any sealant there but remember to make sure there are no nicks in the case halves that could nick the o-ring on installation.
Here is what I found when I opened the cover, which btw seemed to have a lot more than 10Nm of torque on the bolts. No obvious damage to the o ring but evidence of sealant (brown red substance which could be removed with finger nails)
The bore seemed smooth enough and the cover didn't appear to be bent from the hammer marks. I fitted a new o ring and the cover slid into the bore smoothly. I tightened the bolts to 10Nm, then put oil in and watched for leaks. The previous leaks didn't reappear but I realise operating pressure, vibration and heat may we'll make a difference.
I've ordered a spare o ring, but it won't arrive for another week and I have two weeks work travel after that so I decided to act as if it was fixed. I used Red 340 gasket maker to provide a secondary seal after the cover was fitted and am now refitting all of the parts so I can drive the car. Fingers crossed albeit I won't be stressed if it's not fixed. I know what's leaking, I have a plan B and this is all experience for when I do a rebuild on my other 964. Can I do better than the OPC? Time will tell.
02-19-2017, 04:06 AM
#33
Rennlist Member
Thread Starter
....and it's not fixed.
A short drive around the block and it's leaking. Not as bad as before but any leak is unacceptable.
I reckoned it was better to fully reassemble it because then the test could be real world. I think it will take half the time for the second go. It's nice and clean now.
I really hope it's the intermediate shaft cover. There should be a breach in the gasket goo to show me the way.
A short drive around the block and it's leaking. Not as bad as before but any leak is unacceptable.
I reckoned it was better to fully reassemble it because then the test could be real world. I think it will take half the time for the second go. It's nice and clean now.
I really hope it's the intermediate shaft cover. There should be a breach in the gasket goo to show me the way.
11-11-2019, 05:52 AM
#36
Instructor
08-20-2020, 11:43 AM
#37
Pro
Can you give more details on how you used this o-ring to seal the leak? It would seem that you would need something such as the collar to add pressure to the o-ring for a more increased seal.