Chaincase bearings

[t-rav]

Can someone tell me wich side of the bearing has no seal in the chaincase I replaced bearings but both have seals and cannot remember wich way it was lol is the seal on the side u can see behind the gears or the backside of chaincase thatate against drive shaft and jackstaft

 

[SWEDE]

They come from the factory with the seal towards the gears and open on the backside....

 

[barry]

seal should go on shaft side of case

 

[WedigSRX]

their is a section this, try searching the topic.
I would leave the seal on both sides of the bearing, that will keep out the small metal filings from the chain that eats the bearing up. Also it will help keep moisture out.

 

[YAMMIEGOD3:16]

seal goes backside. 3:16 (yammie tony)

 

[Backwoods M Max]

Bearing seal faces the gear. Oil can get past it but it keeps all the metal crud out of it.

 

[YAMMIEGOD3:16]

i have a case out of a 2000 srx in my hand. seal backside. don,t know. lol. 3:16 (yammie tony)

 

[Ding]

Long debate with various opinions through the years. Even the manufacturers can't seem to make up their minds. However, I do believe that in 2000 Yamaha spec'd the seal on the gear side and no seal on the backside. As a previous poster mentioned, the theory is that this creates a wicking action to pull oil in and the seal acts as a screen. I have never tested the validity of this but have noticed that bearings with this config seem to be cleaner than ones with no seal on the gear side. I have seen fully sealed bearings go dry, not sure why this occurs but have seen it more than once. So I always put the seal on the gear side and remove it on the backside.