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Old 03-13-2012, 01:29 AM   #1 (permalink)
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Water pump gaskets

What do you use? If it comes with a paper gasket do you use it? Do you add RTV to it? Do you just use RTV all together?

Did a timing belt/water pump on my parents e30 and the damn thing is leaking. Surface was 100% clean and I scrubbed it with some wheel wool. I'm kicking myself for not adding some RTV to the flimsy, thin paper gasket
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Old 03-13-2012, 01:57 AM   #2 (permalink)
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permatex right stuff, works great in a variety of applications. I've used it in place of hundreds of supplied paper gaskets with 0 issues.

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Old 03-13-2012, 05:06 AM   #3 (permalink)
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iv always added atleast a thin layer of rtv on either side of the gasket IF i run the gasket. way i see it is it never hurts to run a lil rtv.


have fun redoing it
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Old 03-13-2012, 05:27 AM   #4 (permalink)
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On water pumps I've just run RTV
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Old 04-06-2012, 10:28 AM   #5 (permalink)
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Update: I was told the best shit to use for thin flimsy gaskets is the brush on aviation shit.

Car leaks 2 weeks later.

Wtf, the water pump has gotta be fucked up. I triple checked everything before assembling


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Old 04-06-2012, 10:31 AM   #6 (permalink)
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Gasgacinch on all paper gaskets.

Biggest problem I see is people over tightening shit.
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Old 04-06-2012, 10:40 AM   #7 (permalink)
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Used a inch lb torque wrench to torque to 15 ft lb


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Old 04-13-2012, 10:04 AM   #8 (permalink)
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Think I found the problem. Too much belt tension tweaking the wp housing. Only 3 bolts holding it on


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Old 04-13-2012, 12:01 PM   #9 (permalink)
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Quote:
Originally Posted by NorCalPR View Post
What do you use? If it comes with a paper gasket do you use it? Do you add RTV to it? Do you just use RTV all together?

Did a timing belt/water pump on my parents e30 and the damn thing is leaking. Surface was 100% clean and I scrubbed it with some wheel wool. I'm kicking myself for not adding some RTV to the flimsy, thin paper gasket
A good question.

If the parts are new, clean and no pitting just a little blue Hylomar. Another replacement is 3-Bond. Sometimes called "Yamabond"
Its used when the surfaces are precision machined and you don't use a gasket. I would have used it in the application you described, and it would not leak)

If the surface is pitted, sees high temps or pressures I "upgrade" to High Temperature Anaerobic Flange Sealant. (Permatex)

Why not to use silicone?
1. It actually does not stick as well as you think it does.
2. Once cured, its "done". Any movement will cause it to "fail"
3. It can "Spit" the gasket under clamping force. (Its "Slippery, and can shear off the sealing surfaces)
4. You don't see silicone used to seal gasket surfaces on aircraft on in anything that "counts"

Do I have a tube of silicone in my trail box? Hell yes.. works great on sidewalls..
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Old 04-13-2012, 12:32 PM   #10 (permalink)
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I do both sides of pretty much any gasket with Permatex non-hardening gasket sealant. I hate leaks & rarely get any gasket surfaces leaking if I do it this way. It is a royal pain to clean up though when you pull things apart....and its pretty much permanently on anything it gets smeared on.
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Old 04-13-2012, 04:50 PM   #11 (permalink)
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Yarp, I used aviation form a gasket, it's similar to hylomar.

Sjit works good, it sealed up my drive flanges where the rtv did not


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Old 04-13-2012, 04:59 PM   #12 (permalink)
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permatex right stuff, works great in a variety of applications. I've used it in place of hundreds of supplied paper gaskets with 0 issues.
+1 works much better than regular rtv.
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Old 04-13-2012, 06:03 PM   #13 (permalink)
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ultra black rtv, if you prep it right the shit will need a a hammer and pry bar to get it off. any time i have a problematic area that is what i use, works great.
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Old 04-14-2012, 05:26 AM   #14 (permalink)
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I use a skim coat on both mating surfaces of the gasket with the Permatex gray stuff meant for anti-freeze, otherwise I usually use the ultra black for everything else.
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