INFO: Some info about 990 Adv water pump

Discussion in 'Crazy-Awesome almost Dakar racers (950/990cc)' started by 7575KK, Apr 20, 2009.

  1. Gimme 2

    Gimme 2 wheels , with nobs

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    I'd say the # means updated?
    #21
  2. Autostream

    Autostream Long timer

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    I you read the page...

    # = Included in Gasket set (this is in left side diagram by the box)
    * = New Part (bottom of right box and next to item numbering in parts list)
    X = As required (bottom of right box and next to item numbering in parts list)
    #22
  3. cool dude

    cool dude Been here awhile

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    Well, if just those three parts need replacing then in Euro land the parts should cost about:

    8 61235055000 2.56
    4 6003515210023 37.25
    14 61135054044 38.62

    Some of the other parts have different part numbers too FYI...
    #23
  4. brents347

    brents347 Trusting my Cape...

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    OP says that the new impeller was used on his '07, so it would seem that the new part would fit on all 990's and I would think all 950's as well.
    #24
  5. gefr

    gefr Life is a trip

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    the old one was #600.350.521.0023 but the old impeller height was 12,7mm while the new one measures 11,1mm so the hydrodynamics could be worse fitting new impeller to old pump housing. Cheers
    #25
  6. twodollardoug

    twodollardoug the calimesa kid

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    i just got my new impellers today, part # 612.35.055.000. they look quite different than the originals on my 08 sd and o8 adv. i wonder if the op's pump housing was replaced also?
    #26
  7. crofrog

    crofrog Long timer

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    Also with out changing the size of the restrictor (thermostat in this case) you aren't going to dramatacially alter flow rates so I'd see if that's an updated part number as well.
    #27
  8. gefr

    gefr Life is a trip

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    Since the impeller is slimmer by 1,5mm and the housing is also slimmer, I guess the target could be to make it occupy less volume. Just a wild guess, untill I try to install the new items.
    Cheers.
    #28
  9. BobbyC

    BobbyC n00b

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    I ordered a water pump rebuild kit last week and the shaft is new. It looks like there's some sort of coating to harden the surface. The seal is still gray and it comes as a set with the shaft.

    No pics as I was in a rush to get my bike together and head down to NC.
    #29
  10. Autostream

    Autostream Long timer

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    You may be suprised to know it can be possible to improve cooling by slowing the water flow.

    I used to see this with V8's a lot when I was a mechanic in a previous life...

    Often the temporary solution to an overheating problem was to remove the thermostat. But when the actual fault was fixed and the radiator cleaned out or whatever, the engines would often overheat. This seemed to bebecause theater was passing through the radiator so fast it got no chance to let the heat go. Put a thermostst in and slow the water down and it would all be normal again.
    The V8's were affected the most in the ones I sw as they usually had biggest waterpumps, but I have seen it on smaller rice burners too.

    This may have nothing to do with the 990 changes, but sort of related to the subject...
    #30
  11. gefr

    gefr Life is a trip

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    #31
  12. cat

    cat Long timer

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    My conclusion is that I'm not changing mine. - Well, only if I change the housing as well.
    #32
  13. StevenD

    StevenD Hmmmm, dirt!

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    Just kicking this up again!

    Has anyone been round to measuring the shaft? There's a difference in impeller thickness, new one is thinner. The cutout and profile is different in the new housing. Old impeller does not fit new housing, it touches it just.

    I wonder, is the new shaft also shorter?

    I have just installed a new shaft and seal from a kit by KTM and had an 09 housing and impeller left so installed that too on my 07 engine. Works fine but forgot to measure the shaft and check clearance on the new impeller and cover.

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    #33
  14. gefr

    gefr Life is a trip

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    There were no differences in diameter though.
    Cheers.
    #34
  15. StevenD

    StevenD Hmmmm, dirt!

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    At, found an old shaft and compared it to a new one. They are different! So keep 09+ with 09+ stuff, don't interchange unless you know what your doing!

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    #35