BMW 745i Coolant Tube Failure

We repair it with All German Auto’s replacement tube

BMW has a costly and not uncommon problem with the coolant transfer tube in the middle of the engine on its late model V8 engines. The initial complaint is usually loss of coolant leaking from a small weep hole at the front of the engine on the timing cover. This is commonly mis-diagnosed as a water pump problem. The vehicle may also have coolant leaking from the back of the motor at the intake manifold valley area.

This problem applies to

2002-2005: BMW 745I & IL E65 & E66
2006-2008: BMW 750I & IL E65 & E66
2004-2006: BMW X5 4.4i/4.8is E53
2007-2010: BMW X5 4.8i E70
2004-2005: BMW 545i E60
2006-2010: BMW 550i E60 & E61
2004-2005: BMW 645Ci E63 & E64
2006-2010: BMW 650i E63 & E64
2002-2005: Land Rover Range Rover

BMW N62 coolant Tube Removal
BMW M62 with intake manifold and coolant valley cover removed, showing factory coolant tube.

The replacement of the failed tube or tube seals can cost between $9000 - $12,000 at some dealers. This job requires removal of the front timing cover, cylinder heads, intake manifold, timing chain and timing chain vanos systems and many other components. This requires 60 to 80 hours labor!

BMW 745 N62 coolant leak
The factory coolant tube has molded-on non-replaceable seals. This one had failed.
All German Auto in California has made a fix for this problem with a threaded adjustable coolant pipe that can be expanded into place and seal the coolant passage without removal of the front timing cover or cylinder heads. At Autobahn Performance we have done several of these repairs with the All German Auto coolant tube without any adverse issues. The tube is very well constructed and is intricately machined with angled sealing surfaces requiring precise installation.
threaded adjustable coolant pipe for BMW 745