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Thread: oil filings in newly rebuilt final drive

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    metal filings in newly rebuilt final drive

    I just purchased an R1200C with 36k on the clock. The previous owner had final drive leakage problem and had the final drive rebuilt about 500 miles ago. I have a copy of all the work done. Once I got the bike home I thought I would do a tune up and fluid flush/change. When I drained the final drive gear oil I saw a lot of metal filings in the oil. My question is, is this common on a new final drive rebuilt? I didn?t know if there is an initial ?break-in? of the final drive and initial metal filings are common and you change the oil after a few hundred miles or, if the shop did an incompetent job rebuilding final drive. I have changed the oil and will drive it for a few hundred miles and check it again. Has anyone else who had a final drive rebuilt experienced this?

    Thanks
    Last edited by landfellow; 07-27-2013 at 06:05 PM.
    2000 R1100RT, 2005 R1150RT-P, 1999 R1200C

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    Registered User dmftoy1's Avatar
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    Don't know if it helps your state of mind, but on my K1600 you drain the fd at 600 miles and there is smarf and such on the magnet. I did mine again at 3500, and it was pretty clean, and at 9k and 16k it was pristine. (I do overkill and swap fd fluid every time I swap tires.)

  3. #3
    Alps Adventurer GlobalRider's Avatar
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    Quote Originally Posted by landfellow View Post
    Has anyone else who had a final drive rebuilt experienced this?
    Not even on a new motorcycle.

    What was rebuilt? New bearings, new gears?

    Does your final drive drain plug have a magnet built into it? Are the metal filings ferrous or non-ferrous?

    If all is well during your next drain, add some Dow Corning M Gear Lube to your non-synthetic gear oil at a 5% mix.

    I have zilch on my magnetic drain plug at each drain interval.

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    just rode it another 50 miles and drained the final drive fluid. Lots of metal filings and metallic looking oill.. not a good sign. I have 2 other BMW motorcycles and have NEVER seen this much filings when changing final drive oil. Hermy's Tire & Cycle in PA did the rebuild. Has anyone had any experience with them either good or bad? Looks like I may be contacting Tom at Runner Chicken,,
    2000 R1100RT, 2005 R1150RT-P, 1999 R1200C

  5. #5
    Small road corner junkie pffog's Avatar
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    no direct experience with Hermey's, but they are suppose to be a good dealer, I have seen a lot of recommendations for them.
    2010 F800GS Full Ohlins package, '04 R1100S Replika
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  6. #6
    Registered User lkchris's Avatar
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    Go back to Hermys first
    Kent Christensen
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    '12 R1200RT, '02 R1100S, '84 R80G/S

  7. #7
    MOA #24991 Pauls1150's Avatar
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    ABSOLUTELY get it back to them pronto! They obviously screwed something up big-time; anything more than a fine gray dust on the drain plug magnet is an issue.

    Call them first - you may not want to be riding with that stuff...

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    I will call them Monday AM The hard part is that I am not the one who had it rebuilt and the previous owner had a local mechanic remove it from the bike, then sent it off to Hermy's to get rebuilt, and had the local put it back on. So Hermy's never had the bike in their shop but it is defiantly worth discussing with them. Worse case scenerio, Ihave to have it rebuilt again
    2000 R1100RT, 2005 R1150RT-P, 1999 R1200C

  9. #9
    Alps Adventurer GlobalRider's Avatar
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    Quote Originally Posted by landfellow View Post
    The hard part is that I am not the one who had it rebuilt and the previous owner had a local mechanic remove it from the bike, then sent it off to Hermy's to get rebuilt, and had the local put it back on.
    Removing and reinstalling the final drive has nothing to do with how the internals were set (bearings and crown and pinion). The rebuild shop is responsible for that.

  10. #10
    . AntonLargiader's Avatar
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    If the crown gear bearings were replaced but the pinion bearings weren't, there is probably some old debris in the pinion bearings that is still coming out. It's VERY hard to really clean those out without removing them, which adds to the total cost. In this case, if the oil itself is clear, I would just change the oil again and see if this is new metal being generated or just old metal that needs to come out.
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  11. #11
    MOA #24991 Pauls1150's Avatar
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    Landfellow has changed the oil twice already; how many changes should it take to clear out any "old" debris?

    Is there a danger of the [possibly "old"] chips damaging the new parts?

  12. #12
    Alps Adventurer GlobalRider's Avatar
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    Quote Originally Posted by Pauls1150 View Post
    Is there a danger of the [possibly "old"] chips damaging the new parts?
    Yes, and I certainly would not want any metal chips in there in the first place.

    There are "professional" practices for handling bearings so that they last. Metal shavings in the vicinity is not one of them.

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    Called Hermy's today. Was told all work has a 2 yr warranty, however,until it leaks gear oil or the tire has play in it, they will not repair it. "metal shavings are normal" is what I was told. Looks like I have to wait til I am stranded somewhere before I can get it repaired. Makes me wonder if I would have them rebuild it again.. or just send it out to a specialist (aka Rubber Chicken)
    2000 R1100RT, 2005 R1150RT-P, 1999 R1200C

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    I will change the oil one more time.. (3rd time) but NEVER in all my years of changing FD fluid I have seen even a fraction of the "glitter" that is in the oil now... Tthe crown bearing was replaced.. I will check part numbers tomorrow to see if pinion bearings were replaced
    2000 R1100RT, 2005 R1150RT-P, 1999 R1200C

  15. #15
    Pepperfool GSAddict's Avatar
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    Quote Originally Posted by GlobalRider View Post
    Removing and reinstalling the final drive has nothing to do with how the internals were set (bearings and crown and pinion). The rebuild shop is responsible for that.
    Agreed, but without paperwork..........................
    '
    Ufda happens..........

    It's all about the details.

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