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HT4100 4.1, 4.5, 4.9 Discussion, School of hard knocks in Cadillac Engine Technical Discussion; Good luck with that! I use wheel bearing grease when assembling the O rings on the transfer pipe. I also ...
  1. #16
    carnut is offline Cadillac Owners Master
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    Re: School of hard knocks

    Good luck with that! I use wheel bearing grease when assembling the O rings on the transfer pipe. I also make sure the pipe is perfectly clean and not pitted. I remove the coolant sensor on the intake, push the pipe in enough to get a small screwdriver behind the pipe thru the access, then after everything is assembled, I push the pipe forward to the water pump. Then I reinstall the coolant sensor. Maybe you can push it back again but I dont think you will have access to the O rings. Did you use a new pipe or just new O rings? The new pipe has a forked retainer thats installed last to properly position the pipe. It slips over the pipe between the intake and waterpump.

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    Re: School of hard knocks

    just new rings with a little greese.

  3. #18
    carnut is offline Cadillac Owners Master
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    Re: School of hard knocks

    I think the water pump needs to come off again, sorry to say! The pipe should be new unless you somehow damaged the O rings.

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    Re: School of hard knocks

    Thanks carnut,
    I reused the original pipe. The leak is a very slight seepage. I can dab up the coolant with a paper towel and it takes about a week before the puddle returns, under the A/C compressor. (without running the engine)
    So...No way around removal of the water pump?
    What if I use a little sealant rather than grease?
    I dont want to have to disassemble again!
    I think I'll spend a little time with it this afternoon. Its cold right now (30 deg) but the sun is shining and the day should warm up a might.

  5. #20
    carnut is offline Cadillac Owners Master
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    Re: School of hard knocks

    You might try draining a little coolant drying the pipe and apply high temp silicone around both ends of the pipe. Let it set overnight then add coolant. My concern is under pressure it will leak again. Or with pressure the O rings will seat. How lucky do you feel? If it stops seeping, buy a lottery ticket!

  6. #21
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    Re: School of hard knocks

    I agree. If I was lucky I wouldnt...well you know.
    My thought was to apply high temp silicone to the rubber o-rings instead of grease upon reassembly.

  7. #22
    carnut is offline Cadillac Owners Master
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    Re: School of hard knocks

    But that would require access to the O rings once assembled. I've probably done 3 4100 water pumps and I've never used anything but grease to allow the O ring to slide into place. Silicone inside a cooling system sounds like a problem waiting to happen. If it were meant to use anything other than grease, there would be a gasket not an O ring.

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    Re: School of hard knocks

    Quote Originally Posted by carnut View Post
    I think the water pump needs to come off again, sorry to say! The pipe should be new unless you somehow damaged the O rings.
    Yup! That pump has to come off in order to remove the expantion pipe and o-rings.

  9. #24
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    Re: School of hard knocks

    I removed everything again, back down to the water pump and was able to confirm coolant was seeping past the expansion pipe o-ring at the thermostat housing.
    After disassembling I cleaned the ports as well as the pipe and installed new o-rings with a liberal amount of grease. I reinstalled the water pump and radiator hoses then I refilled the system, removing the temp sensor in order to burp the block.
    Two day's later I checked and found no trace of leak so I finished bolting everything back on.
    Just waiting for the Battery to charge up now.

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