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Old 15-12-2023, 07:49   #1
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replacing gaskets

I've just finished pulling off all the peripheral parts to my engine to clean it up and repaint. Now I'm starting to look at bolting parts back on and I'm wondering if anything has to be done with new gaskets prior to installation.
Most of them are some sort of paper and will be doing the following:
oil pan
water pump">raw water pump drive gear
fresh water pump

Should they go in dry? coated in oil? sealant?
The engine is a Westerbeke W27 if that matters.

Thanks
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Old 15-12-2023, 09:48   #2
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Re: replacing gaskets

The gaskets will stand on their own if the mating surfaces are clean and free of defects.

However, in the case of difficult to reach areas [e.g., vertical surface that is difficult to reach] I will coat one flange surface with Aviation Permatex #3 gasket compound to act as a light adhesive to hold the gasket in place while fitting and fastening a difficult assembly together. [Permatex #2 (more viscous) and #3 [less viscous) are both non-hardening; the paper gasket will easily peel free years later. There are many similar products.]

Permatex applied to both flange surfaces will help a thin gasket seal against imperfect flange surfaces.

Just my approach- among millions of others…

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Old 15-12-2023, 10:28   #3
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Re: replacing gaskets

For any type of gasket that is not paper or slides around easily it's good to use something like the Permatex mentioned to hold it in place. Put it on the side of the removeable item so in the future you can remove the part to clean it off as the permatex comes off very difficult. So on like a pan gasket, put it on the pan not the block. Nothing normally on head gaskets.
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Old 15-12-2023, 10:41   #4
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Re: replacing gaskets

Thanks first the replies, I haven't used permatex, and have a feeling that the oil pan is going to be tricky because of the location and size. I assume it's available in automotive stores?
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Old 15-12-2023, 10:57   #5
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Re: replacing gaskets

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Originally Posted by mbowser View Post
Thanks first the replies, I haven't used permatex, and have a feeling that the oil pan is going to be tricky because of the location and size. I assume it's available in automotive stores?
Yes, Permatex #2 is readily available [in a tube], but it is much thicker than the #3 I recommend for use with thin gaskets. I do see the #3 Aviation in a bottle with a brush up here in most hardware stores.

Note: Don’t get Permatex #1; that is the hardening formula which will require much scraping and cleaning to remove in the future…

Cheers, Bill
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Old 17-12-2023, 15:44   #6
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Re: replacing gaskets

Picked up some Permatex #2 over the weekend and got the oil pan reinstalled. Worked great, makes the pan side just tacky enough to keep the gasket in place while I got the bolts in place.
Thanks for the advice
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Old 17-12-2023, 17:00   #7
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Re: replacing gaskets

Yanmar gasket sets now come with 2 big fat tubes of “ Threebond” silicone gasket maker ...... no actual timing cover gasket, no oil pan spacer gasket, no oil pan gasket,....... just Threebond!!
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Old 18-12-2023, 10:09   #8
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Re: replacing gaskets

Quote:
Originally Posted by mbowser View Post
Picked up some Permatex #2 over the weekend and got the oil pan reinstalled. Worked great, makes the pan side just tacky enough to keep the gasket in place while I got the bolts in place.
Thanks for the advice
I’m glad you had success…

Now fess up; how far up your hands and arms [etc.] did the Permatex crawl? <grin>

Cheers, Bill

PS: I got it [#2 Permatex gasket compound] all over a couple of large adjustable wrench handles a couple of years ago. They are still coated and now tacky enough to not readily transfer to my hands. It makes for an excellent non-slip grip on those heavy wrenches…
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Old 18-12-2023, 11:21   #9
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Re: replacing gaskets

Quote:
Originally Posted by wrwakefield View Post
I’m glad you had success…

Now fess up; how far up your hands and arms [etc.] did the Permatex crawl? <grin>

Cheers, Bill

PS: I got it [#2 Permatex gasket compound] all over a couple of large adjustable wrench handles a couple of years ago. They are still coated and now tacky enough to not readily transfer to my hands. It makes for an excellent non-slip grip on those heavy wrenches…
Ha, yep... the one time I decide not to use gloves. That stuff certainly is messy.
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Old 18-12-2023, 23:23   #10
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Re: replacing gaskets

^^ But it smells very much perfume!
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Old 20-12-2023, 17:01   #11
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Re: replacing gaskets

Quote:
Originally Posted by skipperpete View Post
Yanmar gasket sets now come with 2 big fat tubes of “ Threebond” silicone gasket maker ...... no actual timing cover gasket, no oil pan spacer gasket, no oil pan gasket,....... just Threebond!!
Interesting to know that what I've been doing for years ( Using silicone or loctite master gasket ) instead of yanmars asteroid dust gaskets is not that bad.
I'd imagine the 3 Bond is a "special price" as well
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Old 20-12-2023, 18:02   #12
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Re: replacing gaskets

For things that need to come apart occasionally (like valve covers) a nice "trick" is to seal the gasket to the pan/cover/etc well (such as with silicone) and put a think coat of oil on the smooth (block) side of the joint. Then apply a bead of silicone to the gasket, wait until it "just" skins and assemble. This makes disassembly easy as well as avoiding tearing the gasket later.
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Old 20-12-2023, 18:09   #13
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Re: replacing gaskets

Another trick useful for parts where keeping proper registration is important and/or difficult is to use locating dowels. These are simply headless screws that you can make from inexpensive bolts from the hardware store. Choose the correct thread, cut off the head, perhaps hacksaw a slot in the unthreaded end to facilitate removal and place a couple to align the gasket and part. Best choose/cut the bolt so the smooth/unthreaded area bears on the part. Remove when done and replace with the correct bolt.
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Old 21-12-2023, 20:53   #14
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Re: replacing gaskets

Good tips jamhass
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Old 30-12-2023, 08:06   #15
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Re: replacing gaskets

Permatex cleans up easily with solvent alcohol (shellac thinner). Great stuff that has been around since 1909.
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