BMW 760 Coolant Leak From Timing Cover Weep Hole





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Published on Jan 29, 2011

BMW coolant leaking from weep hole to the left of water pump on 745 and 760 engines. This is a huge problem and can cost from $9,000 to $11,000 to repair with the factory part. The good news is All German Auto has engineered a high quality collapsible pipe that can be installed at a 3rd of the cost, you can check out their video for repairing the V8 (n62 engine) http://www.youtube.com/watch?v=UoCED1.... My video demonstrates the fix for the V12 (n73 engine) for witch they also make a repair kit.

Comments • 18

cornel nemes
Hi Jay, thanks for the video! I'm half way to get there on my 760Li and I'm stuck at the fuel rails. I've removed all the screws, metal clips and fuel lines, but I can't pull them out. They wiggle loose, but I can't just remove them. Is there anyway to pull them, using more force, unscrewing something else? I would appreciate your answer! Thank you!
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Nice video! I'm in the middle of this type of job on my 760 and I'm stuck at the fuel rails. Is there a trick on removing them? They both wiggle and are loose, but I can't pull them out. Should I try with more force? I'll appreciate if you can give me any advice. Thank you!
BimmerFix Products Co.
Hi Jan,  Correction about my last comment.  This BimmerFix Product WILL work on the N73 V-12.  It does work GREAT on the more popular N62 V-8 too.  Thanks
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Moe Mufti
Thank you very much for your help and it was the weep hole. I attached a video that I thought may help other understand. - I'll try to attach it. Thank you again.
Jay Kinkade
however, it would be much better diagnosis to see the coolant coming out the weep hole in the timing cover before you disassembled anything.
Jay Kinkade
It is also handy to have an inspection mirror, you can pick one up at any auto parts store for a couple of dollars. If the water pump is leaking the coolant will be coming out from the shaft behind the pulley or from the weep hole in the water pump itself. To the second part of your question, yes you will more than likely be able to see the seal if it is deteriorating with the water pump off the car.
Jay Kinkade
Yes, you can tell. Top-off the coolant when the car is cold, then either start the engine and watch with a flashlight (you have to hold your head at just the right angle to see the weep hole behind the thermostat, but you can see it) or better yet if you have access to a radiator pressure tester you can apply pressure to the system while the engine is off. 
Moe Mufti
Thank you for the video, you are my hero! I have 166,000 miles on my 2003, 760LI which is now leaking coolant. The thing is, I replaced the water pump at 80,000 miles so it makes sense for it to go again at this time and i ordered one to put it in. My question is how can I tell if my cars coolant leak is coming from the weep hole or from the water pump or perhaps both?Alternatively, when I detach the water pump should I be able to feel the corroded washer on the center pipe through the inlet?
Jay Kinkade
Yes, the 750 with N73 V12 engine has the same issue as the 745 with the N62 engine and the fix is basically the same, there's just less room to make the repair. This video is a 750Li, V12 with N73 engine.
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