1984 4.1 liter waterpump
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HT4100 4.1, 4.5, 4.9 Discussion, 1984 4.1 liter waterpump in Cadillac Engine Technical Discussion; Help! My 84 was overheating and when I attempted to pull the t-stat one bolt broke off in the housing. ...
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    patc is offline Cadillac Owners Member
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    Unhappy 1984 4.1 liter waterpump

    Help! My 84 was overheating and when I attempted to pull the t-stat one bolt broke off in the housing. To make things worse when I attempted to drill out the bolt, the bit broke. Now I am at the point of pulling off the waterpump to remove the bolt from the housing. The housing itself appears to "float" on the throat of the pump and a port on the block. Is there anything special that I need to know or be concerned with while doing this? Thanks!

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    MMNineInchNails's Avatar
    MMNineInchNails is offline Cadillac Owners Enthusiast
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    Just buy a new bit.....

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    patc is offline Cadillac Owners Member
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    Re: 1984 4.1 liter waterpump

    Quote Originally Posted by MMNineInchNails
    Just buy a new bit.....
    Everybody's a comedian. Have you ever tried drilling through a hardened bit?

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    Night Wolf's Avatar
    Night Wolf is offline Cadillac Owners 10000+ Posts
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    hmmmm best advice, dumb the HT4100...... you said it overheated...what a surprise with the engine....be happy you didn't wipe out the block and/or heads.....

    Really though, see about getting a Olds 307 (cheap, reliable, never dies) or a Chevy 350 (want more power, or to make a sleeper) for it..... you could probally find one cheap...

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    Katshot's Avatar
    Katshot is offline Cadillac Owners Master
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    Re: 1984 4.1 liter waterpump

    It's seperate replacable housing. But you need to pull the pump to get it off. Everything's all sealed with "O" rings and comes apart quite easy. When you replace the whole assembly, you need a "kit" that allows you to install the whole thing and then install the cross-over pipe after. It comes with a couple clips and instructions on hoe to do the install. After it's done, you'll be able to R&R the T-stat without removing the waterpump.

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