Modern Vespa

The replacement clutch side seal that I got is all metal on the backside (side facing bearing). The one I removed had a rubber outer lip and rubber backside. Different manufactures? Wrong seal? One better than the other?

Oh. Old seal on top of pic. My replacement is bottom seal.

If the metal seal is kosher, do I use loctite on it? What kind, where?

I like the metal ones better, The ones with rubber can fall out easier. I usually clean the surface with acetone and then use red loctite to really glue the metal seal in there.

Thanks for the reply. Red loctite on the "race" and outer edge?

I use Loc-tite 603TM retaining compound for setting main drive seals. 603TM is best when using in an environment where oil contamination is possible.

Don't use "regular" red Loc-tite on rubber in hot engines, especially on a rubber coated seal.

If using the original-style main drive seal (all metal outer with rubber only at center) I recommend using 648 retaining compound. 648 is green and use for pressed-in bearings, but will work well for the metal seal.

Its all metal with rubber in center. Thanks for the reply and specific info. I'll get the 648.

Wow. 648 not easy to find. Gonna order some. Thanks for your info.

The metal ones are easier to put in, but I've had better luck with the rubber ones.

Also, I like Loctite #290. It's called "wicking grade." You put it on after the parts are assembled and it wicks it's way in to the threads (or, not threads). You can drip it on electrical connectors to keep them from pulling apart too.