Can you predict rear drive failure? - BMW Luxury Touring Community
 
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post #1 of 7 Old Jun 20th, 2015, 11:40 am Thread Starter
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Can you predict rear drive failure?

I often wondered if it was possible and my experience might provide some insight.
I've been having the oil analyzed every time I've changed the rear drive lube. (Engineeres have to have data!!)
Typically I change the rear drive lube at every engine oil change. This has varied from 3500 Km to 8500 Km.
The analysis checks for wear products such as: iron, chromium, nickel,titanium,copper,aluminum, tin, lead and lists them as ppm in the volume of oil in the drive.
I "normalize" the results by dividing these ppm values by the number of Km driven between changes.
This graph shows the results since 2008. The amount of iron has been steadily increasing which indicates increasing wear on the ring and pinion.
Chromium has also been increasing and chromium is one of the metals used in the ball bearings.
At this point, my LT has 54000 km and a leak has started to develop at the rear drive and a slight looseness can be felt in the rear wheel.
All of this would seem to indicate that failure is close.
Thoughts and comments????
JIm
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post #2 of 7 Old Jun 20th, 2015, 3:40 pm
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Re: Can you predict rear drive failure?

Quote:
Originally Posted by RealWing View Post
I often wondered if it was possible and my experience might provide some insight.
I've been having the oil analyzed every time I've changed the rear drive lube. (Engineeres have to have data!!)
Typically I change the rear drive lube at every engine oil change. This has varied from 3500 Km to 8500 Km.
The analysis checks for wear products such as: iron, chromium, nickel,titanium,copper,aluminum, tin, lead and lists them as ppm in the volume of oil in the drive.
I "normalize" the results by dividing these ppm values by the number of Km driven between changes.
This graph shows the results since 2008. The amount of iron has been steadily increasing which indicates increasing wear on the ring and pinion.
Chromium has also been increasing and chromium is one of the metals used in the ball bearings.
At this point, my LT has 54000 km and a leak has started to develop at the rear drive and a slight looseness can be felt in the rear wheel.
All of this would seem to indicate that failure is close.
Thoughts and comments????
JIm
It is even easier than that. If you have an LT built in 1999 to 2009 and ride it more than 50,000 miles I can predict that you will have a final drive failure!

It sure sounds like you are ready for an FD rebuild. Time to call Saddleman.

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post #3 of 7 Old Jun 20th, 2015, 4:21 pm Thread Starter
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Re: Can you predict rear drive failure?

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Originally Posted by Voyager View Post
It is even easier than that. If you have an LT built in 1999 to 2009 and ride it more than 50,000 miles I can predict that you will have a final drive failure!

It sure sounds like you are ready for an FD rebuild. Time to call Saddleman.
Nope - traded it on a K1600GTL!!!!!

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post #4 of 7 Old Jun 20th, 2015, 4:31 pm
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Re: Can you predict rear drive failure?

One thing you can do is to feel the FD with the palm of your hand when it is hot from a 20 plus mile ride. The thick part of your palm should be able to stay on the FD for a little bit. If you can't hold the thick part of your palm on the FD for just a little bit it is over shimmed.

I have over 20 hours in the FD I'm rebuilding right now & I'm still not ready to assemble it yet.

Dave Selvig
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post #5 of 7 Old Jun 21st, 2015, 7:26 am
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Re: Can you predict rear drive failure?

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Originally Posted by saddleman View Post
One thing you can do is to feel the FD with the palm of your hand when it is hot from a 20 plus mile ride. The thick part of your palm should be able to stay on the FD for a little bit. If you can't hold the thick part of your palm on the FD for just a little bit it is over shimmed.

I have over 20 hours in the FD I'm rebuilding right now & I'm still not ready to assemble it yet.

Wow Dave I would not want that billthis has to be ery unusual what problems did you run into

Gary
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post #6 of 7 Old Jun 21st, 2015, 9:03 am
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Re: Can you predict rear drive failure?

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Wow Dave I would not want that billthis has to be ery unusual what problems did you run into
I charge the same amount for labor regardless of how much time I have in the rebuild. This one I had to re shim the back lash & ring and pinion contact pattern after repairing the spun taper bearing.

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post #7 of 7 Old Jun 25th, 2015, 10:47 pm
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Re: Can you predict rear drive failure?

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Originally Posted by saddleman View Post
One thing you can do is to feel the FD with the palm of your hand when it is hot from a 20 plus mile ride. The thick part of your palm should be able to stay on the FD for a little bit. If you can't hold the thick part of your palm on the FD for just a little bit it is over shimmed.

I have over 20 hours in the FD I'm rebuilding right now & I'm still not ready to assemble it yet.
I tried this today, 40 minutes on the highway at 120 kph, 75 degrees F, FD just between lukewarm and hot, could touch for 10 seconds no problem. The lower part that holds the oil cooler than the top part. Hope this bodes well for the FD.
101,000 kilometers on the bike.

Gary
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