over flowing coolant.

Discussion in 'Crazy-Awesome almost Dakar racers (950/990cc)' started by Rixxy, Apr 18, 2012.

  1. Rixxy

    Rixxy Been here awhile

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    So, just rode from Otres in Cambodia to BKK (800km) in VERY hot weather 38 + degrees. I cruised up the highway as i was on my way to get a new tyre fitted before heading south. Cruising along at about 120 - 130 KMph full luggage with passenger.

    What i noticed is that my coolant bottle is overflowing, it slowly came up and up and eventually reached the top, its not pissing out but it is over flowing slowly. I cannot tell the colour of it as its dark outside here.

    I have done about 3500km from the last time she was in KTM BKK as she had the water pump seal changed. What could it be, am i right in thinking head gasket??

    I should also say towards the end it felt like i was dropping a little power and when i turned her off at the lights to stop her over heating sometimes she coughed and spluttered as i started her.

    I will get a better look at her tomorrow and i will and take her into KTM but they are nice guys but not a knowledgable as some of you lot and don't deal with lots of 990!!

    Thanks in advance

    Rixxy
    #1
  2. GZERO

    GZERO Fixing stuff around

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    Read the procedure on taking the air out of the system well, it's a pita but that's the problem, air in the system
    #2
  3. ElChico

    ElChico East Yorks

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    Mine did that in France once.. had to get the front wheel high up on a ramp, then open the radiator cap, the air came out, topped up, sorted! Easy fix, but don't forget to be careful if opening the cap when it's hot... scalding!
    Cheers
    Col
    #3
  4. GZERO

    GZERO Fixing stuff around

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    To properly bleed it you need to open the other side of the radiator as well (there's a little screw to purge air).
    Like i said, read the bleeding procedure, it's a pita, but you really really need to know this well.
    #4
  5. Tijuana_Taxi

    Tijuana_Taxi Been here awhile

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    Might be something as easy as the radiator cap needs to be replaced, in the middle of nowhere last year my 07 started doing that and all I had to do was replace the cap.
    #5
  6. g.arbo

    g.arbo Adventurer

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    Rebleed system. Replace radiator cap.
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  7. Orange Toaster

    Orange Toaster Been here awhile

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    Could be the head gasket.
    I recently replaced mine due to similar symptoms. Here's how I tested it to be sure (it's a fairly big procedure so I did not want to do it if not necessary).

    I strapped an empty 0.5 litre soft drink bottle to my right crash bar just under the coolant overflow line. Then routed the line into the bottle. Ensured the radiator was filled to the brim. Went for a good ride.
    Observations: bottle was now half full (approx 0.25 litre of coolant) and the overflow pipe is below the surface. But more importantly when the engine was idling I could observe small bubbles of air (exhaust gas) coming out of the overflow pipe. Try this (and pray for no bubbles!)

    Cheers
    OT
    #7
  8. Rixxy

    Rixxy Been here awhile

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    thanks mate, This is a great head gasket test!!!!

    Im going to bleed her out and see, its the really tall 990 dakar the 08 one and i have had air in the system before so just hoping its that!!

    thanks guys!
    #8
  9. Motard_Menace

    Motard_Menace Been here awhile

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    I just had a similiar issue, after parking when hot I was getting significant overflow. To bleed the system all I did was take the cap off, run for 1-1.5 minutes, top off the fluid and close it back up. Run for another 2-3 minutes and shut her down. Top off the overflow bottle to appropriate level if needed and voila done. Fixed mine, have had it out three or four times since and hasn't overflowed once.

    forgot to mention it has been hotter then hell here already as well 95+ the last day I had it out......
    #9
  10. grinns

    grinns Semper Fi

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    Mine was hoses, you will probably run across my thread.

    Like everyone, I suggest bleed, and thermostat first.
    #10
  11. Rixxy

    Rixxy Been here awhile

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    hey guys,

    For those interested it seems to have been a leaking rad cap. Replaced rad cap ran engine for 5 mins until the fan ran a couple of times then let it cool down and the coolant level slowly dropped back as the air came out.

    I do seem to get all the niggles!!

    I have already changed my hoses, they went about 10,000 km ago - i now have samco's fitted!!

    Rixxy!
    #11
  12. Rixxy

    Rixxy Been here awhile

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    Hey guys,

    SO done 2 more 500 km ish days and had the same symptoms, oddly not until i have done about 200 ish KM's do i notice any real change to the level. I have bleed the system as best i can as i'm unable to get the bike to a good wheelie position atm.

    Things i have noticed and what i have done -

    I now seem to have a clay looking black stuff on the inside of the radiator cap, now i know this is not from wear and tear as the cap is only 500km old since i cleaned it and day old full stop. The coolant in the bottom on the bottle is a bit grey/murkey.

    I have taken the Clutch cover off and the oil is normal so there is no sign of water into oil contamination atm i don't think.

    I have therefore done the test listed above for the head gasket and have attached a small water bottle to the over flow tank to see if there was any air bubbles coming out, i should add I'm not loosing much coolant, infact most of the time what i take out the expansion bottle tops up the radiator perfectly with me only having to add 10ml of water max.

    Again any constructive views or help would be good.

    Thanks
    Rixxy
    #12
  13. Rixxy

    Rixxy Been here awhile

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    Hey,

    SO after a 300 more km after trying to get the head of the bike up to get the bubbles out the coolant i was still having it fill and over flow, so i hooked up the bottle as suggested in the previous thread only i filled it half with water. After about another 200km i started to see bubbles in the water over 6,000 rpm and it slowly got worse the coolant got in the bottle.

    I slowed down and kept the revs well under 4000 rpm and no or very few bubbles or coolant movement.

    She now in KTM bangkok getting fixed had gasket confirmed as being the problem. Just an update!!

    For the record and to help anyone else who my try the same thing, the water was a green/grey once mixed and i got floating bits in it, they eventually settled at the bottom of the bottle as a black sludge. I'm guessing oil contamination.

    There was no white mayonnaise in the oil yet though. I was also starting to loose a little power towards the end, I'm guessing mine didn't blow out yet as i was getting no smoke.

    Thanks for the advice the bottle tricked proved to be invaluable!!
    #13
  14. ten_fiver

    ten_fiver Long timer

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    Now this is a good thread to keep on file. Glad you got it sorted!
    #14
  15. sabink

    sabink Been here awhile

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    Any suggestions how to find out which cylinder gasket is bad, front or rear?
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  16. Vicks

    Vicks gets stuck in sand

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    I don't remember having read about many head gasket problems on the newer (07+) LC8s... yours looks like one of the few.

    good luck with the fix and your ride. After the KTM dealer fixes it, do ride arround for a few days before you move on to another country / far off place.
    #16
  17. Rixxy

    Rixxy Been here awhile

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    #17
  18. Guardrail299

    Guardrail299 Adventurer

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    I seem to have the opposite problem of absolutely no transfer of fluids into or out of the overflow tank. I have had the bike to the Dealer for what I consider to be over heating. (60 degree weather with almost all of the bars lit up at a stoplight) In 100 degree weather same situation warning lights start to go off, Dealer replaced radiator cap, and I have done bleeding with front end properly lifted still no transfer of fluids. Any ideas?
    #18
  19. Orange Toaster

    Orange Toaster Been here awhile

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    Glad it worked out and you found the error.

    For the record, on my bike I did not see any black sludge in the bottle, nor did I see any mayonnaise in the oil.

    Cheers
    OT
    #19
  20. Cowtowner

    Cowtowner Been here awhile

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    If you did a leak down test then it's one cylinder at a time (TDC compression), and you watch for bubbles in coolant.
    #20