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Thread: Water pump gasket sealant???

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    Jedi Trainee Kleykamp's Avatar
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    Water pump gasket sealant???

    Should I use a silicone sealant with the water pump gasket or is the paper gasket enough? Seems I used just the gasket last time and had no leak issues. When I took the old pump off I didn't have to scrape the gasket off either. Same question for the thermostat housing as it is a much thinner paper gasket. Thanks

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    Great Pumpkin TR3driver's Avatar
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    Re: Water pump gasket sealant???

    I wouldn't. Hylomar maybe, not silicone RTV.
    Randall
    56 TR3 TS13571L once and future daily driver
    71 Stag LE1473L waiting engine rebuild
    71-72-73 Stag LE2013LBW waiting OD gearbox rebuild

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    Luke Skywalker mrv8q's Avatar
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    Re: Water pump gasket sealant???

    Way back when, I used a thin coat of Hylomar on both sides of the paper gasket, and all is well.
    Best, Kevin Browne
    '59 TR3A #TS58370L
    Look for The Lost Gold of WWII on The History Channel

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    Luke Skywalker
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    Re: Water pump gasket sealant???

    One advantage of using a bit of sealant is to hold the gasket in place while fitting the pump, housing or part. Back in the day, we used brush top Permatex or sometimes just a bit of grease.
    I don't recall having anything else available but we didn't operate at the leading edge then.
    Tom
    1960 TR3A TS73117 (under restoration year 8, owned since 1964)
    1959 TR3A TS58023 (in case I never finish the one above)
    1969 Triumph Herald 13/60 (a whim)
    1970 Lotus Elan Plus 2 /0023/N
    1992 BMW325IC (fun to drive)

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    Great Pumpkin TR3driver's Avatar
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    Re: Water pump gasket sealant???

    Permatex is good too, although perhaps overkill in this situation. It seals really well, but pretty much guarantees you'll have to tear the gasket in half to get the joint apart, then it's a PITA to clean up the surfaces for the next time.

    My objection to RTV is that it can squeeze out on the inside and form a bead, which can later break off as a string and float around until it clogs something. I've seen this happen even with professionals doing the work.

    Many years ago, a friend and I went to Grand Teton National Park, so he could photograph the sunrise. There is a moment when the sun just peeks over the mountains on one side, and lights up the snow caps on the other side, while the valley is still in relative darkness. Very impressive, I recommend it!

    When we rolled into the valley, 2 hours before dawn, the dash thermometer read 5F. AND, the heater quit working! Brrr! The old wagon had just gotten it's 100,000 mile tune-up a few weeks before, in preparation for this trip; and the radiator shop later confirmed that it was a string of silicone plugging up the heater. (Not one of GM's better designs, on that engine the water pump had to come off to change the distributor cap.)

    Unfortunately, his camera didn't work (apparently got too cold while setting up), but here's an idea of the shot he was going for:

    Randall
    56 TR3 TS13571L once and future daily driver
    71 Stag LE1473L waiting engine rebuild
    71-72-73 Stag LE2013LBW waiting OD gearbox rebuild

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    Luke Skywalker
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    Re: Water pump gasket sealant???

    Quote Originally Posted by TR3driver View Post
    Permatex is good too, although perhaps overkill in this situation. It seals really well, but pretty much guarantees you'll have to tear the gasket in half to get the joint apart, then it's a PITA to clean up the surfaces for the next time.

    My objection to RTV is that it can squeeze out on the inside and form a bead, which can later break off as a string and float around until it clogs something. I've seen this happen even with professionals doing the work.
    I should have mentioned that we always put the Permatex only on the pat that comes off. That way disassembly is easy and you can scrape off the goo on the bench. Tom
    1960 TR3A TS73117 (under restoration year 8, owned since 1964)
    1959 TR3A TS58023 (in case I never finish the one above)
    1969 Triumph Herald 13/60 (a whim)
    1970 Lotus Elan Plus 2 /0023/N
    1992 BMW325IC (fun to drive)

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