Need help: oil drain washer position.

[AL72]

Hi guys, I'm going to change the oil and replace the drain bolt and washer.
The washer it has some kind of step in one side, and the other side is flat. (photos). What side of the washer is facing the cranckcase cover?

Thanks a lot!

 

[Rumpig]

I'd guess the flat side to the crankcase. The washers designed to crush when tightened to seal well and work like a spring washer.

 

[dart1963]

doesn't really matter, it's designed to crush and fill in little imperfections... it will crush as needed, just don't over torque and you'll be fine.

 

[TN6R]

I've read that you need to be very careful not to over torque or you could end up cracking the case where that bolt threads back on. Use a torque wrench man.

 

[alaskanflyboy]

I've read that you need to be very careful not to over torque or you could end up cracking the case where that bolt threads back on. Use a torque wrench man.

I've never heard of that with our bike, but many have pulled the threads out of the pan (it's aluminum and the bolt is steel).

 

[AL72]

Thanks for your responses, and actually I use a torque wrench (31 ft-lb in the oil drain bolt)

Thanks a lot!