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Thread: coolant leak

  1. #1

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    coolant leak

    So after losing the supercharger gear in the motor, I had no choice but to rebuilt the engine in my '10 rxtx 260.
    All went well, followed the instructions in the shop manual, all bolts torqued to proper specs and all.
    Motor fired right up and no issues apart for some coolant loss at the very bottom of the PTO bolts.
    As soon as I fill the reservoir tank, it starts to drip at approx a drop a second.
    Thought it was the coolant pump that was leaking and making it look like it was the PTO but it wasn't.

    Thought it might be the seal in the back of my coolant impeller but wouldn't there be coolant in my oil if that was the case?
    Any ideals?


  2. #2
    Maybe the gasket was pinched or bad between the pto and block?

  3. #3
    Kosh's Avatar
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    Check out the weep hole on the pto cover, there is a drilling open to the environment between the water pump mechanical water seal and the shaft oil seal. The idea is if you do have a leaking mechanical water pump seal it will drip out rather than enter the crankcase.
    you may need a mirror and torch to see.

  4. #4
    boost junkie skidoochris's Avatar
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    torch = flashlight


    Click image for larger version. 

Name:	torch.png 
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    what do you aussie's call this?

  5. #5
    Quote Originally Posted by skidoochris View Post
    torch = flashlight


    Click image for larger version. 

Name:	torch.png 
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    what do you aussie's call this?
    That's called a flashlight, mate.

  6. #6
    Kosh's Avatar
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    lol, I should of said some form of concentrated external lighting, that being said a 'torch' or I call it 'oxy acetylene' will light the way and help evaporate any excess coolant

  7. #7
    SLASHER's Avatar
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    Yeah us Aussies call a flash light a torch....lol

  8. #8

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    Maybe the gasket was pinched...I glued both side of that gasket so I don't think it would have moved but could be. As for the bypass hole would it not leak coolant outside the pto cover and not inside of it? If I remove the bottom bolt and blow in the reservoir, coolant rushes out from the bolt hole. Could I get away with silicone or right stuff around the bottom bolts and torque them back up? I'm trying to avoid removal of the pto if I can. Having to remove the shaft sucks!

  9. #9
    suck my wake's Avatar
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    Did you replace the seals behind the water pump impeller during your rebuild? If not it sounds like you need new seals, the weep hole is located on the lower right side of the PTO housing as viewed from the rear of the motor, if thats where the coolant is coming from then its a good bet the seals, mainly the mechanical one is bad. If the inner seal goes bad then yes you will see coolant in the oil..

  10. #10

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    Yes, replaced both the mechanical and oil seal, but didn't have the tool BRP recommends I use. It's leaking from the bottom bolts, not the weep hole, it drips at approx a drop a second. If I put pressure in the coolant reservoir and remove that bolt, then coolant rushes out of the hole the bolt was in. If I put my finger on the hole, then coolant goes out the next bottom bolt.

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