BMW N62 Coolant Leak from The Coolant Transfer Pipe

Does your BMW N62 V8 have a coolant leak from the coolant transfer pipe? The first step is to diagnose your leak correctly. BMW provides a handy 5mm weep hole on the front of engine block that will indicate if you have a leak because your coolant transfer pipe is failing. (see photo)






Why Me?

The cause of this leak is that the original factory installed coolant transfer pipe’s bonded seal has failed. The failure occurs primarily due to corrosion caused by an electro chemical reaction between the coolant, metal and rubber seals over time. (see photo) This corrosion allows for the leak around the seal that results in coolant leaking from the weep hole in the engine block, noted above.






This failure can occur as early as 40,000 miles on the BMW models and years listed below:

  • 2004-2005 BMW 54i
  • 2006-2010 BMW 550i
  • 2004-2005 BMW 645Ci
  • 2006-2010 BMW 650i
  • 2002-2005 745i & Li
  • 2006-2008 BMW 750i & Li
  • 2004-2006 BMW X5 4.4i/4.8i
  • 2007-2020 BMW X5 4.8i

The Old Method of Repair

Until recently the repair for the leaking coolant transfer pipe was to completely disassemble the engine including the water pump, valve/cylinder covers, and timing cover and chain. This could result in up to 40-60 hours of labor and subsequent parts that could add up to an additional $800, or more. In the end this repair could run in the $8-10,000 range.


Fifth Gear Automotive has recently implemented a state-of-the-art solution that not only provides a better than OEM part solution, it requires a third of the labor hours to complete and does not require any major engine disassembly and is less evasive to engine. Therefore, a job that only recently would have cost in the neighborhood of $8-10,000 can now be accomplished for just under $2,000.




How Does Fifth Gear Automotive Do It?

With the help of URO Parts, who developed a collapsible coolant transfer pipe as compared to the factory designed one-piece solid tube. This new collapsible only requires our Certified Mechanics to drain the cooling system, remove the intake manifold and other related components to expose the intake valley pan and then remove the intake pan so the factory coolant pipe is exposed. (see photo) This process takes a fraction of the time that would be needed to remove the water pump, valve/cylinder covers, and timing cover and chain.

Once the factory coolant pipe has been exposed it is cut with a small saw and removed. The old seals are removed, and the galleries are cleaned and lubricated in preparation for the new seals and tube. The assembled, and slightly collapsed, coolant pipe is greased and slid into position against the timing cover first and extended into the rear block and locked into using aluminum shims and ring grooves in the tube. The new coolant pipe has triple redundant inner seals, is made of anodized aluminum tubing that resists corrosion and is fully serviceable.

Once the Intake valley pan is replaced along with the intake manifold, the cooling system is recharged, and pressure checked to insure proper installation. And you are ready for the road again.

Check Out This Video With Fifth Gear Automotive Master Certified Technician Tim Edwards


Examine Your Weep Hole Today!

If you are experiencing a coolant leak, examine your weep hole on the front of the block for coolant leaking. Then contact Fifth Gear Automotive in Lewisville, TX, where we have the Certified Mechanics with the tools and the knowledge to get the job done right, and in this case faster and cheaper than you might think. Give us a call to set up a reservation today or click on the link below.

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Fifth Gear Automotive

Fifth Gear Automotive is a family owed independent automotive repair shop with over 100 years of experience with all domestic and import makes and models, specializing in European auto repair and since 2004 serving Lewisville, Highland Village, Flower Mound, Lantana, Double Oak, and the surrounding communities. We have one goal; Complete Customer Satisfaction on all your auto repairs