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Old 07-19-2015, 10:21 AM   #1
gots2no
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Case sealing question

Getting ready to apply case sealant and have a question. I assume it should be applied on all mating surfaces to preserve even clearances on the case even if those areas do not need sealing?
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Old 07-19-2015, 11:33 AM   #2
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Most manuals will state not to apply sealant there near the main bearings and oil passages to prevent any sealant from coming loose and clogging up the oil galleys and pump filter causing oil starvation. Sealant is used to prevent stuff from leaking out and in. Those surfaces are inside the case so it doesn't even matter. You can put a very thin film there but that's totally up to your discretion. Motors have not exploded from gasket sealant not being present there out of the factory and this practice has been going for years.
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Old 07-19-2015, 01:58 PM   #3
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dont think you need sealant if there is a factory gasket but if you do use something like yamahalube or GS11, silicon swells much bigger and blocks oil pasages the other stuff doesn't and it also doesn't completely cure making it a good sealant.

My personal opinion is the only thing that needs sealant if a gasket is not present would be the outside of case, most definately do not put that on the caps like you have shown above. Proper measurement and clearances that are withinfactory tolerences should solve the comment above.
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Old 07-19-2015, 10:56 PM   #4
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Quote:
Originally Posted by gots2no View Post
Getting ready to apply case sealant and have a question. I assume it should be applied on all mating surfaces to preserve even clearances on the case even if those areas do not need sealing?
I would and have applied sealant there. As far as I'm concerned, it needs it there to seal oil from the bolts. I always apply it very thin. Just short of wiping it completely off, and that is for the entire mating surface.

Stay as far off of the bearings as possible while making sure there is enough to create a proper seal.
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