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7 Series - E38 (1995 - 2001)

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  #1  
Old 12-29-2009, 07:06 PM
paullydoo1 paullydoo1 is offline
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Location: Mission, BC, Canada
 
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Mein Auto: 1995 740i
95 740 - Coolant leak

I have a 1995 740i, and could not find where my coolant leak was until recently. I had it pressure tested and found it leaking between the engine and transmission within the bell housing. There is no visible wetness above the bell housing.
The engine isn't blowing coolant out the tailpipe, and neither is it affecting the oil or radiator content. It just simply streams out from that location.
I've heard about leaks from the intake pan gasket streaming out of drain holes. Are they in the bell housing area? I'd hate to pull the engine only to find this. Any info would be welcome!
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  #2  
Old 12-30-2009, 06:01 AM
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drivinfaster drivinfaster is offline
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Location: in the sticks you piney
 
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Posts: 10,883
Mein Auto: rescued bmw's
here's a quick diagram of the system. it's most likely one of the gaskets for the pipes under the intake.

http://www.realoem.com/bmw/showparts...16&hg=11&fg=35

(a closer view of the pipes, not pictured above)

http://www.realoem.com/bmw/showparts...46&hg=11&fg=35

you will need to pull the intake manifold to repair this, or even to verify the component that is leaking.

hope this helps.


df
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  #3  
Old 12-30-2009, 06:05 AM
paullydoo1 paullydoo1 is offline
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Mein Auto: 1995 740i
thanks for the references... will tear it apart soon and find out for sure.
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  #4  
Old 05-27-2010, 09:14 AM
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PETER NEWMAN PETER NEWMAN is offline
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Location: RAINHAM KENT UK
 
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Mein Auto: BMW 635 CSi BMW 730i E38
I'm a semi retired BMW specialist, there is a chance that there is a core plug at the rear of the engine block which maybe situated behind the flyheel within the tranny bell housing area which is leaking coolant into the bell housing, Core plugs normally leak due to becoming rusty due to lack of anti freeze changes and you maybe into a lot of expense which I hope not but if one is leaking the others will follow soon when you fill with fresh anti freeze. This happened to my girlfriends Mazda mx5, when she bought it it had a main dealer full service history but no anti freeze changes and I've also found this on four cylinder mercedes engines also with main dealer full service history.
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