F800 GS valve adjustment schedule

Discussion in 'Parallel Universe' started by gstreff, Nov 2, 2012.

  1. gstreff

    gstreff Adventurer

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    Anyone up on the max time you can go on an F800 GS valve adjustment.
    My bike has 16,000 miles on it and according to BMW of Denver I am scheduled to have the valve adjustment check up at 18,000 miles (used to be 12,000) The bike is a 2009 and has had religious oil changes and not a terrible amount of riding through dust.
    My problem is that I am about to head off to ride around Mexico... probably put on around another 4000-4500 miles and would be at 21,000 miles potentially before I got back and would have the valves checked for adjustment.
    Any input on that being stupid rather than having the valve adjustment early? Bike is running like a clock right now. Just got back from a full trip Colorado/Alaska/Dawson Yukon. Not a single problem on the trip.
    #1
  2. Indy Unlimited

    Indy Unlimited Long timer

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    My first valve adjustment was needed at 40,000 miles. All of the intake valves were only 0.01 mm tight ( 0.22 mm clearance) I moved them all to 0.33 mm .
    The exhausts were also on the tight side of spec or under by only 0.01 mm ( 0.29 mm clearance )I brought them all to 0.41 mm clearance .
    #2
  3. JRWooden

    JRWooden Long timer

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    18K miles is now the adjustment interval ???
    Wow...
    I had not heard that ..............

    I do know that the on-board computer keep track of when IT thinks you need to adjust the valves (base on how hard the bike is ridden I presume). I had the first check done at 12K by local dealer to "maintain" the warranty should I need it.
    I have a GS-911 and one of the things it displays is the "suggested" mileage for the next check.
    In my case it suggested I could let the check slide until about 29K miles.

    I've been told that (like Indy's experience) sometimes the valve lash goes down (gets used up) with age ...
    (I still don't understand why that is the case :huh )
    Anyway, if that's common it might be possible to "use up" all of the lash and then burn a valve if you held off too long...
    #3
  4. vtbob

    vtbob wanderer

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    I had my first valve check(not adjustment) done at 30K miles as the dealer did not feel it needed to be done at the 12 and 24k miles services. At 30k miles the valves were checked, but I was not charged for any adjustment shims...so...maybe no adjustment was needed.

    there is some uncertainty of the dominate wear mechanism on f800 engine valves. I would hope some one with some factual knowledge would speak up.

    the two wear mechanism are the sliding interface of the cam and the follower (the one i believe to be dominate). This would make the valves looser over time/milage.
    the other is the wear between the valve seat and the valve itself. this would make the valve check tighter over time/milage.

    the bad result is tighter...as it will eventually cause a "burnt" valve seat/valve and them become "leaky"


    I asked my dealer exactly the same question at 20k miles before a 10k mike trip to alaska last summer. he said don't worry we'll check them when you get back....that is what I did...per above.

    enjoy your trip
    #4
  5. gstreff

    gstreff Adventurer

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    Thanks for the input guys. Seems like no rush on checking the valves till somewhere over 18,000 miles
    GAry
    #5
  6. 1994klr250

    1994klr250 Been here awhile

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    I checked my valves for the first time at 21,000 miles. I did them myself while I was fixing the leaky valve cover. All valves where still in spec. I did this just before leaving for Alaska on a 10,500 mile ride this past summer. I'll probably check them again in the spring. I'm at just over 35,000 miles so far.
    #6
  7. Loutre

    Loutre Cosmopolitan Adv

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    same here: took her to the dealer last week and the dealer just looked at it but said they was nothing to do untill 40000kms (and even that isn't sure). He'll probably just take a quick look and that's it. can't imagine how they'd losen up before that kind of mileage.
    #7
  8. ebrabaek

    ebrabaek Long timer

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    As minute dirt particles are ingested over time, the valves wear in their seat. When they wear, the valves will now sit ever so slightly higher up in their seats, causing the valve springs to extend further, causing the valve stem to protrude further, thus minimizing the valve clearance. IE..... They get tighter. A good valve train with high quality valves like these, will not move much with out said ingestion. But you can vary the ingestion factor like with a K&N filter, and then running in the dirt, without a pre filter.....etc..... But with a say 10000 mile filter change, if you run a lot of dirt, I would venture out to say, you vill not see any movement. The wear is not on the cam lobe, and valve stem.....as they are lubed good, but the slow abrasion of the dirt ingestion.
    #8
  9. moto74

    moto74 displaced

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    About to go in to my dealer for a 20,000km service on my '13 bike. He says the valve clearances won't need checking / adjusting yet. Is the current thinking that 20km is too early or unnecessary for this (read: for those of us who don't have the DIY skills) ?
    #9
  10. Reaver

    Reaver Outta Here

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    Wow. A Dealer not making you spend more? Either a great Dealer or they don't know how to check them. :huh

    If the Dealer is OK with it and will stand by the warranty then go for it! Having checked dozens of bikes at Motorrad, I've only adjusted one old K bike. (R boxers don't count.) A lot of the BMW models had their checks extended to 30K km intervals due to findings and complaints. Don't know why the F bikes didn't.

    No worries mate. Save your cash for gas.
    #10
  11. moto74

    moto74 displaced

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    Thanks. I reckon my dealer is solid, I just wanted to check. Appreciate the advice.
    #11
  12. Reaver

    Reaver Outta Here

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    I think part of BMW's reasoning is to spread out the cost of maintenance. Our F bikes need a fork oil chg at 30K kms which involves removing them to drain. Add that with a valve check and the 30K bill would be HUGE. Maintenance is usually meant to be done in less than 8 hrs elapsed time to acommodate a business day. Major jobs need more preplanning.

    20K on a '13? Must be summer down there. :wink:
    #12
  13. moto74

    moto74 displaced

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    Yep 20K on the '13.

    Feel for you up in the 'north.
    #13
  14. HighTechCoonass

    HighTechCoonass Living the Dream....

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    I did mine at 11K no adjustment was needed.
    #14
  15. JRWooden

    JRWooden Long timer

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    at both 13K ant 26K I had one valve on the tight side.........

    and ... I've still got to stare at the valve train to try to figure out how these damn things get tighter as they "wear" .................. :huh
    #15
  16. dpm

    dpm Been here awhile

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    google "valve seat recession". The sealing face of the valve wears, the valve seat wears, and the seat is continually hammered upwards into the head by the closing valve.
    #16
  17. JRWooden

    JRWooden Long timer

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    Thanks, the part I'm not getting is that in every other engine that I am familiar with ... wear in other parts of the valve train "dominates" (cams, followers, rocker arms, ends of valve stems, .....) such that in aggregate the clearances tend to get larger with time.

    Why is it that on this engine they seem to get smaller with time? :huh
    #17
  18. Reaver

    Reaver Outta Here

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    I was going to explain it by taking your head and bashing it repeatedly against the wall and pointing out that over time, your head will recede into the wall kinda like what time does to hairlines but dpm's explanation works too.

    I'm no expert but can be on the internet. The F bike has a very short valvetrain. The only "real" wear is the cam lobe spinning on the rocker arm. Recession wins and the clearance is lessened. On a "cam in block" engine where there's the cam, lifter, pushrod, rocker arm then valve, the path is like an inverted J and wear wins opening the gap. Long path, more wear. Really short, direct path is less wear. All things equal, recession remains the same.

    :baldy Eventually, there will be a dent in the wall. :D
    #18
  19. JRWooden

    JRWooden Long timer

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    Sure sure ... if you say so ... at least I still got my hair :rofl

    I've owned a total of 5 overhead cam vehicles that had less parts in the valvetrain than the F-bike. A couple were shim over bucket with the cams directly riding on the shim they still got looser with mileage.

    Can I put a piece of carpet on the wall and have a couple Fosters before we get started? :freaky
    #19
  20. Reaver

    Reaver Outta Here

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    Then it's the superior German design coupled with the highest quality metals lubricated with a secret blend of select dinosaurs.

    There are things in life that I just accept. Not enough time to ANALize everything. :1drink
    #20