Subject: Oil Filter Housing FREEZE PLUG Leak: Anyone fixed it yet? Author: cn as CNN-090 : member since July, 2004 : 1088 posts Posted on: 2009-11-10 10:54:25

Has anyone done the E39 O.F. Housing FREEZE Plug Fix?
1. Remove plug and apply Loctite (may leak again).
2. Remove plug, tap/die thread and use plumbing pipe plug to seal it
3. New Housing is $330!!!

I have been chasing a minor engine oil leak and just replaced Oil Filter Housing Gasket (The Gasket between the Housing and Engine), but to my surpise, the oil leak from the Oil Filter Housing persists!

After some meticulous cleaning and checking with a mirror/flash light with engine running, it turns out the Oil Leak is from the FREEZE PLUG of the Oil Filter Housing:



These O-rings (PN 11421709513) are listed for E30, E36 and Z3 only, and not for E39.
[url][/url]http://www.realoem.com/bmw/partxref.do?part=11421709513

Apparently for E39: these are similar to "Freeze Plugs" in the engine, simply pressed in by pressure.

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Searched around, there have been problems before in different BMW models. This is a thread from E34 (1995 525i) but the idea is the same:

http://forums.bimmerforums.com/forum/showthread.php?t=1109419



CNN-090
1998 BMW 528i 5-speed 103K

• Oil Filter Housing FREEZE PLUG Leak: Anyone fixed it yet? (pic) (url) - CNN-090 2009-11-10 10:54:25 (901 views)
  • Update (pic) - CNN-090 2009-11-16 10:04:21 (335 views)