740 Turbo oil leak

57RKL · Nov 23rd, 2010, 22:37

Hi All,

I have recently bought a 1988 740 turbo (B230et) that is dripping quite a bit of oil on the driveway. Would anyone know if this model has one of those crankcase breather thingys that might be the culprit ? Not got myself a haynes manual yet !

gpl1968 · Nov 23rd, 2010, 22:45

Yes, a blocked breather system can cause oil leaks, especially on the turbo engines.
You can find details in the FAQ

crogthomas · Nov 24th, 2010, 11:50

Oil could be leaking from a number of different places, the best thing to do is to get it clean with a jet wash and lots of soap then see if you can trace the leak imediately after a short run.

The most likely culprits are:
The crankcase breather blocked and oil leaking out of the base.
The turbo drain pipe can crack at the top or leak at the bottom seal.
The seal between the oil filter adaptor and the block can go hard an not seal properly.
Crankshaft rear main seal.
Sump plug needs a new copper washer.

Hope that helps!

Nov 23rd, 2010, 22:37	#1
57RKL Senior Member Last Online: May 10th, 2024 09:03 Join Date: Sep 2007 Location: Hazel Grove	740 Turbo oil leak Hi All, I have recently bought a 1988 740 turbo (B230et) that is dripping quite a bit of oil on the driveway. Would anyone know if this model has one of those crankcase breather thingys that might be the culprit ? Not got myself a haynes manual yet !

Nov 23rd, 2010, 22:45	#2
gpl1968 VOC Member Last Online: May 5th, 2024 23:42 Join Date: Jun 2007 Location: Wirral View Photos By: gpl1968	Yes, a blocked breather system can cause oil leaks, especially on the turbo engines. You can find details in the FAQ __________________ Gavin 1997 945 CD (B230FK) [RIP: 1991 945 Turbo (B230FT) 1992 945 SE turbo (B200FT)]

Nov 24th, 2010, 11:50	#3
crogthomas Master Member Last Online: May 17th, 2024 15:38 Join Date: Jan 2008 Location: Bracknell, Berkshire, UK	Oil could be leaking from a number of different places, the best thing to do is to get it clean with a jet wash and lots of soap then see if you can trace the leak imediately after a short run. The most likely culprits are: The crankcase breather blocked and oil leaking out of the base. The turbo drain pipe can crack at the top or leak at the bottom seal. The seal between the oil filter adaptor and the block can go hard an not seal properly. Crankshaft rear main seal. Sump plug needs a new copper washer. Hope that helps!

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)