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chrisleika

wr400f case bearings

4 posts in this topic

Bike Yamaha WR400F 1998. year

I splited the case and saw that 2 bearings in left crankcase was closed from one side:

 

1. Outer side of drive axle bearing vas closed - there goes seal

2. Outer side of main axle bearing where goes clutch push rod in left case

 

So i have question, theese 2 bearings should be open from both side or close from outer side???

 

 

DSCF1151.JPG

Bearings from inside the case

 

DSCF1156.JPG

Bearings from outside the case

 

Thank You

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I'm working on a YZ250 right now, but the bearings should be similar.  The left side output shaft bearing (83A915) is open on both sides, no seals, but I can't see how a seal on the outide could hurt.  The left side main transmission shaft bearing (6004RUD) is sealed on the outside or the side facing the clutch actuator arm housing.  Hope this helps.

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I'm working on a YZ250 right now, but the bearings should be similar.  The left side output shaft bearing (83A915) is open on both sides, no seals, but I can't see how a seal on the outide could hurt.  The left side main transmission shaft bearing (6004RUD) is sealed on the outside or the side facing the clutch actuator arm housing.  Hope this helps.

left side main transmission shaft bearing (6004RUD) is sealed - in my photo did you mean the small or big bearing is sealed??? Sealed itself or outside is another seal?

In my picture big bearing - drive axle bearing was sealed itself and + outside ist another seal

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They are both supposed to be sealed on only one side and the seal is supposed to be on the outside. If you put them in backwards the seal will pop out from the oil pressure, at the top of your first picture is where the oil feed line is inserted into.

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