rear drive bearing change - BMW Luxury Touring Community
 
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post #1 of 5 Old Jan 18th, 2010, 12:09 pm Thread Starter
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rear drive bearing change

My 01 LT has about 50, 000 km on it now. I was told buy a former lt owner that I should take it in and get the original bearing changed before it fails, as it is cheaper than fixing a failed one. Is this true? Should I change it now? He also said the replacement bearing has 18 rollers, not 12 like the original. Anyone know about this?
I am also thinking about doing a transmission oil change, coolant change and spark plug change when I replace the air and fuel filters. Is there a link or site with instructions to do these and what types of fluid to use?
Kevin
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post #2 of 5 Old Jan 18th, 2010, 12:31 pm
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Re: rear drive bearing change

Quote:
Originally Posted by kronson
My 01 LT has about 50, 000 km on it now. I was told buy a former lt owner that I should take it in and get the original bearing changed before it fails, as it is cheaper than fixing a failed one. Is this true? Should I change it now? He also said the replacement bearing has 18 rollers, not 12 like the original. Anyone know about this?
I am also thinking about doing a transmission oil change, coolant change and spark plug change when I replace the air and fuel filters. Is there a link or site with instructions to do these and what types of fluid to use?
Kevin
Lots of questions here and I'll leave the FD bearing issue to those with greater knowledge than I.

There is a great search function on this site and you can punch in "coolant change", "spark plugs" and get a wealth of info from prior posts.

This post is on the home page at the bottom and gives you a lot of info regarding the engine oil,transmission and final drive fluid changes as well.

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post #3 of 5 Old Jan 18th, 2010, 12:37 pm
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Re: rear drive bearing change

I wouldn't touch the Final Drive besides changing the oil. If you are concerned of it failing, buy a used one and carry it as a spare.

edit: Hall of Wisdom http://www.bmwlt.com/forums/faq.php?...w_faq_maingear

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post #4 of 5 Old Jan 18th, 2010, 1:52 pm
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Re: rear drive bearing change

Quote:
Originally Posted by kronson
My 01 LT has about 50, 000 km on it now. I was told buy a former lt owner that I should take it in and get the original bearing changed before it fails, as it is cheaper than fixing a failed one....
First: No, there were slightly different bearings used over time, but not 12-ball.

Second: don't touch the bearing unless you know what you are doing and know how to check and change the preload. View posts of CharlieVT and articles in BMWMOA ON for more detail on the issue; here it suffices to say that the cause of the failures is related to housing tolerances and to the preload. If you just replace the bearing without checking and adjusting the preloading shims, the potential causes of failure remain - that is, if you actually have anything incorrect.

I'd say that at 50k km you are probably OK by now and should not worry. It seems that most drives fail earlier - although my '00 LT indeed went out at high 30k's miles. One preventive-maintenance method is to change the FD fluid at each engine oil change. This allows checking whether any metallic pieces are flaking off the bearing balls or the ball cage - presumably letting you know about an impending failure.

If you need to put your worries to rest, do as ironbuttwannabe suggested and get a spare one. You can have it boxed-up and ready to ship in case of a failure - that is what I do. Remember that - at the very, very least - you need a 30mm socket to take off; properly it should be a special modified socket.

Also, read up on the maintenance procedures and required maintenance intervals. Some of the items are not simple - I hope that you realize that fuel filter change is a time-consuming job as it requires removal of all bodywork and lifting off the tank.

Good luck! It's a fun machine!

Robert in Northern NJ

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Last edited by rdwalker; Jan 18th, 2010 at 2:26 pm.
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post #5 of 5 Old Jan 18th, 2010, 1:57 pm
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Wink Re: rear drive bearing change

Quote:
Originally Posted by kronson
My 01 LT has about 50, 000 km on it now. I was told buy a former lt owner that I should take it in and get the original bearing changed before it fails, as it is cheaper than fixing a failed one. Is this true? Should I change it now? He also said the replacement bearing has 18 rollers, not 12 like the original. Anyone know about this?
I am also thinking about doing a transmission oil change, coolant change and spark plug change when I replace the air and fuel filters. Is there a link or site with instructions to do these and what types of fluid to use?
Kevin
I would just go with changing out the Final Drive Gear Oil along with your Engine Oil changes in order to watch for problems. Your friend is not 100% correct in what he says about the Ball Bearing count anyway. There were 19 Ball units, and 17 Ball units. They switched from the 19 to 17 at some time in the past, and I believe, may have returned to the 19 Ball units. Not really sure that it made any difference in the failure rates, but we were all hoping for anything that would fix our problems back then. The problems were more prevalent on the earlier models, so your awareness is justified. But as far as the pre-emptive replacement goes, that is a judgement call.

I have gone through 2 FD's on my 2000 LT, so I do watch the Oil closely as well as the wheel play.

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John

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