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Old 06-07-2019, 02:12 PM   #1 (permalink)
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Default Water pump questions.

So again, I am making a new post because all work has come to a stop waiting to find an answer. I hate to start posts for each question, but it's the only way I can get a response. And of course I am sitting around with tools out and everything uncovered with possible rain headed this way.
So my questions are....
First, the replacement pump came with soft gaskets, and the one on it had a metal gasket between the water pump assembly. The gasket that mates to the block is soft like the one on it was, but there was tons of what looked to be black RTV on both seals and gobs of it coming out around everything.
So is it OK to use the soft gasket? And the manual says nothing about using anything with the gaskets. Should I use the rub on permanent for seals, or should I use black RTV.
https://youtu.be/ub3usZoCP-c
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Old 06-07-2019, 02:19 PM   #2 (permalink)
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Default Re: Water pump questions.

I like doing a job only once and particularly despise water pump leaks, so I use a gasket along with a thin layer of black RTV on both sides to ensure a proper seal.

Mechanic preference I guess.

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Old 06-07-2019, 02:33 PM   #3 (permalink)
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Default Re: Water pump questions.

+1 with the above mentioned - definitely a preference. Regardless, make sure that the surface is clean.

Permatex actually offers an RTV that is "water-glycol" resistant much like their commonly used one for parts that see oil.

https://www.permatex.com/products/ga...licone-gasket/



For certain metal gaskets, I will sometimes use their copper spray. Just my two cents.

Good luck!
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Old 06-07-2019, 02:33 PM   #4 (permalink)
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Quote:
Originally Posted by 68Whiskey View Post
I like doing a job only once and particularly despise water pump leaks, so I use a gasket along with a thin layer of black RTV on both sides to ensure a proper seal.

Mechanic preference I guess.

BSN, RN, EMT
should I go out and grab some avtual black RTV or would one of these that I have work?
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Old 06-07-2019, 02:34 PM   #5 (permalink)
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Default Re: Water pump questions.

Quote:
Originally Posted by bboyalan View Post
+1 with the above mentioned - definitely a preference. Regardless, make sure that the surface is clean.

Permatex actually offers an RTV that is "water-glycol" resistant much like their commonly used one for parts that see oil.

https://www.permatex.com/products/ga...licone-gasket/



For certain metal gaskets, I will sometimes use their copper spray. Just my two cents.

Good luck!
I agree, I use the copper spray on many gaskets with phenomenal results.

The water pump & thermostat housing RTV bboyalan mentions does work great- it fixed a water pump o-ring leak for me a while ago, when nothing else worked.

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Old 06-07-2019, 02:36 PM   #6 (permalink)
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Default Re: Water pump questions.

Quote:
Originally Posted by HOTROB View Post
should I go out and grab some avtual black RTV or would one of these that I have work?
That Permatex Ultra Grey or Black should be fine. Dont use copious amounts - just a nice thin bead.

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Old 06-07-2019, 02:41 PM   #7 (permalink)
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That Permatex Ultra Grey or Black should be fine. Dont use copious amounts - just a nice thin bead.

BSN, RN, EMT[/QUOTE]thanks I wasn't sure if the black would be ok since it isn't labeled an RTV. I am leaning on ultra grey because of the heat tollerance. The black silicone has no heat rating listed on it.
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Old 06-07-2019, 04:56 PM   #8 (permalink)
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Default Re: Water pump questions.

I've used both just depending what I've had on hand they'll work.

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Old 06-07-2019, 05:13 PM   #9 (permalink)
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Default Re: Water pump questions.

The OE metal gasket is best, but if the gasket surfaces are pitted, you risk it leaking. I would not use the paper gasket myself, but if I did, I'd use a gasket dressing like high tack or equivalent. I would strongly advise against using any RTV on a paper gasket. It will eventually just turn into a mess.

If the surfaces are not in a condition to accept the metal gasket, I would use no gasket at all, and seal it with anaerobic sealer or a good quality RTV.
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Old 06-07-2019, 05:39 PM   #10 (permalink)
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I am guessing this is not a good sign.
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