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weep hole at water pump is weeping

in 912 / 914 Technical Questions 12 years ago

  • Re: weep hole at water pump is weeping

    by » 12 years ago

    Evans coolant may make your temps too high. It is a good coolant, but depending on the application it can cause temps to be 20-30F higher and thus reduce any benefit from it. Open air engines tend to work better with it. Tight cowed engines tend to run a little too hot. We can't run it in the Flight Design CT without the temps going over max. You may be better off with better cooling with a 50/50 mix. I doubt it was your coolant that did you in unless you had silicates and left the coolant in too long before changing it. You should change coolant every 2 years. It only takes 2/3 - 1 gal. of coolant and only a few minutes to change so it should not be neglected. The seals are meant to hand the small amount of coolant pressure so it should not be an issue. Thousands of other Rotax 912's use standard coolant and don't have the problem.

    The seal is a mechanical thing and can fail on occasions or if debris gets in there and erodes the surfaces.

    Roger Lee
    LSRM-A & Rotax Instructor & Rotax IRC
    Tucson, AZ Ryan Airfield (KRYN)
    520-349-7056 Cell

      
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  • Re: weep hole at water pump is weeping

    by » 12 years ago

    Roger, your so right. But luckely we have a slight cooler climate here in Norway :D
    I will give Evans a try when testflying, and if I get coolant issues, I will try water and glycol mix.

    The job taking the rear end appart went easly. Looking forward to recive the press tool and the new parts.

    Thanks,
      
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  • Re: weep hole at water pump is weeping

    by » 12 years ago

    Is it still the loctite 243 I should use on the seal ? Or 648 ?
      
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  • Re: weep hole at water pump is weeping

    by » 12 years ago

    Hi Thomas,

    Yep, I would say Norway is a little cooler than most of us. Norway would be a fun place to visit. Evans may work for you then. Evans would work for me in the winter here in Tucson, AZ, but once the OAT's hit 21C then engine temps are too high and become counter productive.
    Loctite 243

    Roger Lee
    LSRM-A & Rotax Instructor & Rotax IRC
    Tucson, AZ Ryan Airfield (KRYN)
    520-349-7056 Cell

      
    Report

  • Re: weep hole at water pump is weeping

    by » 12 years ago

    To thoose of you witch has performed this task. My parts and press tool is on theire way. Please correct me if I am wrong.

    Everything has been taken appart, cleaned and checked for inperfections. Everythings looking good. I polished of some slight corrosion inside where the oilseal and ceramic seal is mounted.

    So over to the re-assembly :


    * Press new shaft seal into ign housing pre-oiled. Sealing lip showing inwards.
    * Press rotary seal carefully onto the press punch tool 877-258, then press the waterpump shaft into the tool until it stops (Assumeing it bottoms inside the press tool ?) conical end first.
    * Place the pump gear inside the ign housing the right way.
    * Press the shaft with the rotary seal allready on into the ign housing. (Do you now press the shaft and seal all the way in until the shaft has gone through the gear and is flush with the sealing flange) ???

    THIS IS WHERE I GET CONFUSED. Please someone, explain.

    Now place the ing housing on a flat surface and, using a handpress, press the water pump shaft into the STOP wat max. 20kN with a punch (4), part nr 877258. Then turn the ign housing and press the waterpumps shaft back using a 10mm bolt until the collar of the waterpump shaft is flush with sealing surface of the water pump housing.

    ISSENT THE SHAFT ALLREADY PRESSED IN ? AND WHY PRESS IT BACK OUT ? AND OUT OF WHAT ? THE GEAR OF THE SEAL. I AM SURE THE JOB WILL GO FLAWLESS, BUT I AM KINDA CONFUSED ON THE ASSEMBLY OF THE SHAFT INTO THE SEAL, THE SEAL INTO THE IGN HOUSING AND THE SHAFT/SEAL INTO THE GEAR.

    Thanks,
    Thomas
      
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