Preparations for a new water pump - Alfa Romeo Bulletin Board & Forums
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post #1 of 13 (permalink) Old 08-25-2019, 11:50 AM Thread Starter
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Preparations for a new water pump

By the looks of the green droplets flying out of the front of my 1300TI's water pump, I'm guessing it's time to replace it, and have a new one somewhere in transit between Centerline and SF. Not having replaced a water pump before, I'm curious if those of you who have, have any suggestions on how to prepare for the job. Are there any particular sorts of chemicals that are good for cleaning up the mating surfaces, and is it necessary to put any kind of sealant on the metal surfaces and/or the gasket before bolting the new unit on?

If it's necessary to use a sealant, and you have any recommendations on brands, I'm all ears.

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AA
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post #2 of 13 (permalink) Old 08-25-2019, 01:31 PM
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Just make sure the area is clean, I usually use fine grit paper. Normally the gasket is just fine, but you can use rtv, in my opinion.
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post #3 of 13 (permalink) Old 08-26-2019, 06:12 AM
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Clean very well, especially around the tach drive bushing, and the oil pressure hole. You want a good seal there.
As long as you're there, if you feel like removing the crank pulley, it's a good time to do the front crank seal, if needed.

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post #4 of 13 (permalink) Old 08-26-2019, 07:22 AM
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Quote:
Originally Posted by isaacferreira View Post
Normally the gasket is just fine, but you can use rtv, in my opinion.
The choice of gasket sealant is a bit like motor oil (or religion) - everyone has a preference, everyone has strong feelings.

RTV would NOT be my first choice. It's hard to apply in thin layers, it tends to ooze out "worms" that get into your coolant & oil passages and it smells like cat pee. I prefer a non-hardening gasket sealant applied it in a thin layer:



Or old-school, brush-on sealant:

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post #5 of 13 (permalink) Old 08-26-2019, 12:08 PM Thread Starter
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Another question...do you apply the Permatex to the metal surfaces, the gasket, or all of the above?
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post #6 of 13 (permalink) Old 08-26-2019, 12:17 PM
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The last water pump I got had specific instructions to install the gasket dry. Use a good gasket and clean the surfaces and you’ll be fine.
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post #7 of 13 (permalink) Old 08-26-2019, 12:23 PM Thread Starter
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Thanks, Tom. Guess I'll wait and see what sort of instructions come with the new pump.

Much obliged!
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post #8 of 13 (permalink) Old 08-28-2019, 06:33 AM
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One caveat. If a new pump, this shouldn't apply. I had a rebuilt pump once, I guess the sealing surface was not that smooth. I installed it dry, with a gasket. Once it heated up and expanded a bit water found its way into the oil passage. Took a while to diagnose that one. So I use sealer on both side of the gasket not matter what.
These are 6mm studs and nuts so need to be snug but not gorilla tight. The two left-most studs (generator side) go through the front cover into the block so stretch more.

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post #9 of 13 (permalink) Old 08-29-2019, 04:18 AM
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Quote:
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The last water pump I got had specific instructions to install the gasket dry. Use a good gasket and clean the surfaces and you’ll be fine.
I know of NO gaskets applied at the factory that used sealants around them. If you insist on using them which is okay, I suppose, I would use a Wurth product that is applied as thin a film as you can get it on both sides of the gasket .. some sealants work like glue and can make R&R parts the next time a real PITA. The old school Indian black sealant used on gear boxes is pretty good to used on gear box halves. Permatex makes it too. Looks and smells like licorice. I always installed water pumps and intake manifolds dry and never ever had a problem. Oil sumps I might put a very itsy small swab around the studs. I might do the same on a water pump depending on the gasket material. I cursed PO's when dismantling engines with gooy 'glued" on gaskets on them. I also never used anything but a Reitz gasket (unless not available) which are impregnated with graphite and meant not to stick..
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post #10 of 13 (permalink) Old 08-29-2019, 07:30 AM
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Another question...do you apply the Permatex to the metal surfaces, the gasket, or all of the above?
I would lay the gasket on a piece of newspaper and smear a thin coating of sealant on the side that goes against the pump. Then I'd stick that to the pump surface. Next, I'd apply sealant to the other side of the gasket. After making sure the stud holes in the gasket are aligned with the holes in the pump housing, you can install the pump&gasket to the engine front cover.

The key to applying sealant is to just wet the gasket. You don't want any accumulation of sealant to ooze out.

Quote:
Originally Posted by divotandtralee
I know of NO gaskets applied at the factory that used sealants around them.
Sure, but the aluminum surfaces were nicely machined when the factory assembled these engines. But today, after many rebuilds, those surfaces are often nicked and gouged after having various hack mechanics scrape off the old gaskets with chisels, axes, chainsaws, etc. So you often need some sealant to stop those wounds from bleeding.

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'67 Duetto
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Last edited by Alfajay; 08-29-2019 at 09:47 AM.
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post #11 of 13 (permalink) Old 08-29-2019, 09:08 AM
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post #12 of 13 (permalink) Old 08-29-2019, 05:01 PM
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Jay.. you are correct but I haven't taken apart an engine assembled by a gorilla, . I think a close eye on the subject spells what needs to be done. Anything not smooth needs smoothing and gaps (gouges) are an easy dab of gasket sealant I mentioned but only enough to seal the gouge. Boy, you must have seen some junk in your day. I only use plastic or a wedge of pine if necessary to break things loose. Never ran into a cratered gouged gasket seat or part that goes on it.
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post #13 of 13 (permalink) Old 08-30-2019, 08:53 AM Thread Starter
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I got the new water pump from Centerline. Interestingly, the installation guide says that if you're installing the pump with a gasket, that you shouldn't use sealant. If you install it without a gasket, though, it says you should use sealant. Out of paranoia, I'm inclined to use a smidge.

Thanks for all the input!
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