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Thread: v8 water pump upper weep hole

  1. #1
    Senior Member
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    v8 water pump upper weep hole

    What's your thoughts on dab of silcone on UPPER weep hole
    rather than waitng for "nature" to take it's course and gum it ?

    Don't recall ever actually paying attention to that hole,
    not talking about the lower weep.

    It's too hard for me to even see if it's open or not since installed.
    Eyes were fun then too as I hunted the old gaskets, couldn't find them.
    Perfectly flat and full coverage with a little shine I thought was block.
    My hands immediately told me different when I went to clean before
    putting on new gaskets. Lately I've started painting things white on truck
    just so I can find them later. Think I'll paint windshield before long.

  2. #2
    Senior Member chengny's Avatar
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    Just a thought;

    GM probably made a few hundred thousand or so of these coolant pumps over the years. And, (as you know) I am no expert but I would imagine that they were designed to be very flexible in regards to application. A centrifugal pump doesn't care how it is mounted as long as the shaft is parallel to the longitudinal axis.

    Anyway this pump was most likely spec'ed for many different engines (i.e. marine, locomotive, emergengy generators, etc.). It could be that the upper weep hole is actually the lower weep hole if the pump was intended to be mounted upside down as compared to a SBC.

    BTW - I paint everything either black or silver.
    1986 Sierra Classic
    Lost it in a fire

    Replaced with 1986 Sierra K3500 single axle

  3. #3
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    dab of silicone?? i wouldnt put alot of faith in it. try it and see how it works. you may have found a simple solution to this problem. but definitely keep an eye on it over the next while. instead of silicon, you may try using QuikSteel or the like. it may harden and put up with the temps a bit better especially if you do form some sort of pressure there. except for the mounting of the fan to the clutch, that job is pretty simple and easy to do, even with less than perfect eyesight.

  4. #4
    Senior Member Oldmech's Avatar
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    I use silicone in the mud trucks.. the mud pits around here are pretty nasty. Youd be amazed where that silty stuff gets.. so yah, after i lost a couple of Weiand HV pumps prematurely I started putting a dab of silicine "over" both the holes. I put it over instead of "in" the holes so i could remove it once in a while to check for leaks. Keeping that grit out of those holes seems to have greatly extended the life of my water pumps. (in this particular situation)

  5. #5
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    Thanks for the replies guys.

    Never should have opened the hood, keep finding "one more thing"
    Course with the pump, I am swapping the t-stat,
    so I figure good time to clean that ground while there.
    Then my lazy eye wanders over an inch to the next ground.
    Hey, I should clean that up too, see a little corrosion starting.
    Well, gee, I says to myself, I stould remove the stud to clean,
    can't work that easy while hiding in the slot. Sounds good.
    Why just pull the one when I can get that lift backet too ?
    That means pull the bolt on it's other end, out it comes.

    This is where my life bites me with stuff I no longer remember.
    Are both holes blind ? I can see bottom of one but other is junked.

    Do these need thread locker ? If I used more than 12 ft/lbs to remove,
    then I must be superman.

    Top half of bolts as going through intake (intake is not threaded)
    are ugly but cleanable. Hurt to backfill top with silicone to prevent ?

    Like everybody else, I want answers as soon as I'm done typing.
    Couldn't actually use them that fast, I will still be waiting
    for more painted things to dry.
    Any one else painting their truck one inch at a time ?
    It's 1hr to sunset, fog rolling in, winds at +15 .... yea rattle can !!

  6. #6
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    must be sunset now. sorry for being tardy back but i have other obligations on Thurs like any other person trying to make it along in the world. you know how that goes.
    i didnt use thread locker on the intake bolts on my truck and they are still holding true at 15 ftlbs. couldnt hurt though.
    if you are worried about seepage through the holes, you shouldnt have any. that is what the gasket is for. since you didnt remove all the bolts, the gasket should still be in great shape and would not be prone to leaking.
    silicone on everything. you have stock in that company??

  7. #7
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    Not that it's shaping my agenda brad,
    but I have a can of black and a tube of silly.
    I can hear it already. Shut up.

    Clearly the threads had something on them before.
    Just wondering how important, sounds like you think not.
    Are they both blind holes or just the one ?

  8. #8
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    Back in highschool my friend had an 86 Iroc with a 350. Naturally he was flat broke and the waterpump started leaking out the weap hole. We filled it with silicone and he drove it for another 3 months before the bearings went out of it.
    Joe
    89 K2500 Chevy, Wee-Oh-five 294K miles
    1962 Scout 80 parts I guess
    1966 Scout 800 resto job
    2005 Chevy 2500HD Short cab long box DURAMAX
    1996 P30, 6.5 NA Mac Mobile
    whole lot of buicks

  9. #9
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    Quote Originally Posted by crabtruck View Post
    Not that it's shaping my agenda brad,
    but I have a can of black and a tube of silly.
    I can hear it already. Shut up.
    you make it too easy at times.

    i would imagine that both holes are blind so use maybe a dental pick and compressed air to blow out the threads free of dirt and debris. do you have an icepick that you can test with?? and no, i am not promoting using more of her kitchen utensels. i am stating that for the record.

  10. #10
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    Quote Originally Posted by bradrhale View Post
    ...and no, i am not promoting using more of her kitchen utensels.
    i am stating that for the record.
    I been saying "that texas guy told me to" for years
    Took some convincing because she said
    "why that nice gmc and jw would do no such thing"
    I told her there's another side to texas ...

    So since I had nothing else to do between coats of paint
    I played with the pictures. Idle hands and all that...
    .


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