GT coolant issue..... - K-Bikes.com - Excellence in Motion
 
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post #1 of 8 (permalink) Old Aug 31st, 2008, 9:30 pm Thread Starter
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Unhappy GT coolant issue.....

Well I figured I would post that my '06 GT is back in the shop (trip #3) for a pretty bad coolant leak. I have been having this issue most of the year...1st trip they said it was air bound?!, 2nd trip they couldn't explain why it was overheating or find a coolant leak even though it was eating coolant......... and finally have the shop thinking that it is probabling leaking within the engine...........no sign of an external leak at all and it goes through roughly 16oz every other tank of gas!! Have to travel with extra coolant. I am still awaiting for an answer from the shop......I am told they have the GT tore right down . This trip (#3) is going on 2 weeks. Makes you go hmmmmm.......



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post #2 of 8 (permalink) Old Aug 31st, 2008, 9:58 pm
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Do you get a big white puff O'smoke when you start up?

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post #3 of 8 (permalink) Old Sep 8th, 2008, 4:51 pm Thread Starter
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Sorry I didn't respond quick......but I have no visible white smoke out the exhuast. I just picked the bike uo from the shop .......they were able to fix my EWS issue. They confirmed that the GT is loosing a decent amount of coolant! They confirmed that there is no external leak! They said that they couldn't find the leak, but it is loosing coolant?!?! They want me to run the bike and see what happens......DUH!!! ....So here I am with the bike back.....It will be going back to them in about 400 miles when it is out of coolant agian. This will make the 4th trip for the same problem. What do I do???
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post #4 of 8 (permalink) Old Sep 8th, 2008, 5:10 pm
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Could it be mixing with the oil somehow? Is your oil fill level going up?!
Maybe the leak is dripping on something hot and evaporating?
Have they done a pressure test?

This is odd indeed...

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post #5 of 8 (permalink) Old Oct 2nd, 2008, 12:47 pm
 
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coolant

I don't know this motor well enough, but my guess would be there is an internal leak between the coolant passage and the combustion chamber. It would have to be in a non pressurized area, or the combustion pressure would pressurize the coolant system. They should have already caught this with a pressure test. With the catalitic converter you might not notice any vapor in the exhaust at all. The exhaust could be sniffed (called sniffing for head gasket failure) to see if coolant is being vaporized. The head gasket, head & block castings could also have a leak or leaks. It has to be going somewhere the question is where. If its not leaking to the outside. And not going into the oil. It has to be in the intake or the combustion area and going out the exhaust.
The dealer will totally hate this option, because there is no "small" fix, and might require a motor.
If the dealer doesn't find it and they don't have the ability to "sniff" for the vapor take it to a car dealer or repair shop that can. If they have a BMW car side they should have it as part of their emissions testing equip.
Best of luck
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post #6 of 8 (permalink) Old Oct 2nd, 2008, 3:24 pm
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If you're still under warranty, this may be good news because if it does appear to be a pin-hole leak within the engine, you'll likely get the engine replaced. The question is how many times does the bike have to go back before either the problem is remedied, or BMW caves and pops for a new engine.
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post #7 of 8 (permalink) Old Oct 3rd, 2008, 9:31 am
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Do an oil change, or take some from the tank under the seat, and send a sample to a lab to have it analyzed. They'll find the coolant if it's going in the oil. Then take that report to your dealer and leave them speechless.

See post from Brahma HERE for an example of an oil analysis report.

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post #8 of 8 (permalink) Old Oct 3rd, 2008, 9:40 pm
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Coolant tracking

A common way of find the missing coolant in autos is to load the system with a UV tracer. A black light will reveal not only where the missing coolant is, but where it has been.

Could be head gasket, pinhole, etc. Diagnosis will take time. No sane dealer/brand will swap a motor before exhausting all possibilities but it's likely you will get one. In the mean time ride like hell; your're getting a free motor soon. Ever hear your rev limiter kick in?

Good Luck,
Jeff
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