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Crank breather check valve

Rafael

GT Reference
Joined
Feb 16, 2009
Messages
1,096
Location
San Leandro, CA
Continuing saga of the Quota tear down.

I removed the large crank breather hose for replacement and found the check valve completely clogged with rust. This check valve design doesn't make sense to me, it traps condensate at rest unlike the valve in the T-3 which is in the breather box and is upside down so it can't trap anything. I have an Augustini breather box on my SP and left out the check valve; seems to work. I'm tempted in leaving it out on the Quota. Any opinions out there about leaving this check valve out?

Rafael
 
Get a new one and put it in. The valve is designed to be one way, to let air out of the crankcase, but not back in. Good for efficiency.
 
Thanks John-

I guess I'll get one for my SP as well.

What do you think of relocating the check valve at the upper end of the hose where it connects to the frame? My thought is that with the check valve up high less vapors and crud from the frame box will roll down rest on the check valve than if it were at the designated location. The valve would end up on an incline, so I would make sure the ball drops to the bottom and seats properly.

I suspect this problem was caused by the bike not being ridden for extended periods. We found the hose to the air filter box disconnected as well.

Rafael
 
Yours is the first I have ever heard of getting rusty. Probably from the other hoses being disconnected. I think the original position is best.
 
I've never seen a rusty one befor either... thanks again! The check valves are in route.

Now that I think of it, the motor oil still showed signs of moiture the second oil change after buying the bike. It seems that without the crank vent system operating properly condesation doesn't evaporate.
 
The Quota has been on a couple of rides now. A couple of people that have ridden it before and after, the new PCV, say that it's running better. The improvement is too subtle for me, it didn't ride it very much before, but I'm sure enjoying it now. It's mine for the winter while we work on the SP. :cool:

So, if your bike has sat around for a while, especially in a coastal region, check that PCV make sure it's working properly.

thanks again
 
Old thread, but for posterity...

The rust issue is caused by condensation from the breather sitting in the frame's breather tank. The tank rusts, and the rusty oil emulsion runs back into the engine. This may be caused by taking a lot of short trips so that the condensation isn't heated out of the breather, but in my opinion it is not a gamble you want to take. I can confirm that my Quota had this problem as the sump was full of rust chunks. Thankfully the oil pump screen seemed to do its job properly in my case.

As a quick fix, disconnect the breather return hoses from the heads and run them into a catch tank.
 
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