E60 M5 Oil Cooler O-Ring problem
Discussion
I searched but did not find a thread related to this specific problem I encountered. I'm therefore posting to see if any one has encountered the same or perhaps I've missed something!
Mine is the 05 model with 65k miles and new to PHead. I had the irritating Oil Cooler leak from where the pipe connects to the Oil Cooler. Not a puddle of oil leak but visible through the grill. Some research revealed that checking and replacing the O-Rings/seals could be the solution.
Luckily, there was no damage/holes or leaks from the Oil Cooler itself, but the O-Rings were clearly damaged/broken. This was the cause of the leak. I obtained the part number and bought replacement O-Rings from BMW. Only one part number has ever been listed for my: 17222245358. This is O-Ring is thinner ring in the photo. It is silver in colour but appears black due to oil stain. I immediately noticed that the new O-Rings were not as thick as the broken ones I had removed from the car,but the same diameter. I showed it to the dealer and they insisted it was the only part number available for my car and would fit just fine.
After installing the new O-Rings, I started the car and Oil gushed out through the joint which the
O-Rings were meant to have sealed. I went back to the dealer and they gave me the thicker
O-Rings: 64538375742 which is a bit wider (13.7mm) than 17222245358 (13.4mm). I fitted the replacement rings and the leak stopped immediately. Although the thicker ring is 0.3 wider than the part numbered ring, it still made a tight fit when rolled in place over the pipe.
I’ve driven the car for 100 miles and kept the engine hot but no leaks. I had the Oil Cooler and surrounding area jet-cleaned free of oil, and removed the engine undertray to make sure there was no oil deposit on the floor where car is parked. No leaks.
I was worried about using the thichker rings as I was not sure if it was designed for the E60 M5. Some online reasearch shows that rings can be used but for a different pipe:
http://www.bmwetk.info/teile-katalog/prd/BMW/VT/P/...
Although the leak has stopped, and I’ve since driven the car for over 100 miles, I’m slightly concerned that the original part numbered rings were too thin. I had the car on seller 3 month warranty which covered the work, but has now expired. I do have the car on private warranty and intend to replace the Oil Cooler if I get another leak. Has anyone experienced the same problem with the O-Rings?
Mine is the 05 model with 65k miles and new to PHead. I had the irritating Oil Cooler leak from where the pipe connects to the Oil Cooler. Not a puddle of oil leak but visible through the grill. Some research revealed that checking and replacing the O-Rings/seals could be the solution.
Luckily, there was no damage/holes or leaks from the Oil Cooler itself, but the O-Rings were clearly damaged/broken. This was the cause of the leak. I obtained the part number and bought replacement O-Rings from BMW. Only one part number has ever been listed for my: 17222245358. This is O-Ring is thinner ring in the photo. It is silver in colour but appears black due to oil stain. I immediately noticed that the new O-Rings were not as thick as the broken ones I had removed from the car,but the same diameter. I showed it to the dealer and they insisted it was the only part number available for my car and would fit just fine.
After installing the new O-Rings, I started the car and Oil gushed out through the joint which the
O-Rings were meant to have sealed. I went back to the dealer and they gave me the thicker
O-Rings: 64538375742 which is a bit wider (13.7mm) than 17222245358 (13.4mm). I fitted the replacement rings and the leak stopped immediately. Although the thicker ring is 0.3 wider than the part numbered ring, it still made a tight fit when rolled in place over the pipe.
I’ve driven the car for 100 miles and kept the engine hot but no leaks. I had the Oil Cooler and surrounding area jet-cleaned free of oil, and removed the engine undertray to make sure there was no oil deposit on the floor where car is parked. No leaks.
I was worried about using the thichker rings as I was not sure if it was designed for the E60 M5. Some online reasearch shows that rings can be used but for a different pipe:
http://www.bmwetk.info/teile-katalog/prd/BMW/VT/P/...
Although the leak has stopped, and I’ve since driven the car for over 100 miles, I’m slightly concerned that the original part numbered rings were too thin. I had the car on seller 3 month warranty which covered the work, but has now expired. I do have the car on private warranty and intend to replace the Oil Cooler if I get another leak. Has anyone experienced the same problem with the O-Rings?
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