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  Should I use LockTite and/or gasket sealants?

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Author Topic:   Should I use LockTite and/or gasket sealants?
Legobusier posted 04-11-2004 09:50 PM ET (US)   Profile for Legobusier   Send Email to Legobusier  
Hi all,

I'm in the process of replacing my water pump and was wondering if I should use locktite on the lower unit bolts and the water pump bolts. My Clymers manual says to use it, but I wanted to see what you all think. I've even had people tell me to put anti-seize on the bolts.....which is it?

Also, should I use a "gasket sealant" on the gaskets before setting them or just clean the surfaces? I have heard some gasket materials are meant to swell a bit when they are in contact with water (and therefore seal) and the gasket sealants actually can prevent this from happening. Any opinions on this?


greyg8r posted 04-12-2004 03:48 AM ET (US)     Profile for greyg8r    

Having just overhauled my 1982 Evinrude 90, here is what the Clymer manual says about that engine (and my personal opinion):

Loctite(r) (or generic equivalent) is recommended for all applications. I agree. Use the blue stuff, not the red stuff. The red stuff will kick your a-- when it comes to removal time. Blue stuff unbolts easily (but not too easily).

I think Loctite will also reduce the corrosion obviating the anti-seize.

As for the gasket sealer, I became a certified auto mechanic as an undergraduate and continued to work p/t for a few years. I cannot recall a mechanic using gasket sealer and I certainly never did for cars. I don't know why boat engines would be different from cars as the gaskets don't really come into contact with the water. But, since the Clymer manually recommends gasket sealer, I would (and did) use it on my boat engine.

Just my dos centavos.


Legobusier posted 04-12-2004 08:29 AM ET (US)     Profile for Legobusier  Send Email to Legobusier     
Thanks for the response Richard. Acutally, the Clymer manual says generally NOT to use gasket sealant unless specifically noted (or something like that). I was just wondering what the general consensus around here was - if there is one.

The other reason I was wondering: One of the two gaskets I just pulled (with the water pump) had gasket sealant & one didn't. The top one did (the one you would remove to get to the impeller). The bottom gasket did not. This is the one that is under the water pump base. I assume this has never been disassembled and looked to be a factory (sealant free) installation.


BW23 posted 04-12-2004 08:41 AM ET (US)     Profile for BW23  Send Email to BW23     
I recently replaced the water pump and gearcase on my 97 MERC 225 EFI.

Factory manual says to use Loctite 272? on the water pump assembly which I did.
I did not apply any lube to the gearcase bolts because they dis-assembled quite easy.

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