Gasket sealant

[tlewick1]

I'm rebuilding a 1150 Mercury -- the repair manual recommends Loctite blue for the crankcase assembly (where the gasket consists of only a rubber strip.) I've used Loctite for screws but didn't know it could act as a sealer. My question is, should I get gasket sealer and put it on the gaskets where there's a liquid passing through? (i.e. Crankcase and cylinder block covers, carburetor.) Again, do I need to add a sealant to certain gaskets?

 

[Texasmark]

Locktite thread sealer is activated by contact pressure. It is also a thin liquid. If you are talking about the front and rear halves of the crankcase/block then I would say it's the right application as you don't want to change the dimensions but you want a seal. Volkswagen Bugs with the opposed 4 bangers had the same problem. Calling for the blue says they know that sooner or later someone will be in the block and will need to take it apart. Blue is for sealing with subsequent repair access, unlike red which is made primarily for a one time application and locks up tight. We used the blue primarily in my work in industry as the equipment had to be repairable.

 

[Faztbullet]

Must be a Seloc manual.. You don't not use blue Loctite on any sealing surfaces on this engine. The manual calls for Permatex 2C-12 or a equal. Permatex aviation sealant or Loctite 515 will work just use sparingly around oil passages.

 

[Texasmark]

Must be a Seloc manual.. You don't not use blue Loctite on any sealing surfaces on this engine. The manual calls for Permatex 2C-12 or a equal. Permatex aviation sealant or Loctite 515 will work just use sparingly around oil passages.

I thought it was a little strange using a thread sealant for a casting mating sealant, but who knows......surely you do! However the dimensional consideration (I would think) is still a consideration being that you are using these two castings to contain the crankshaft, bearings, and seals.