KEDO - Performance Products search itemno 27815

Thanks Jens.
Next question : Where is the possision of the valve ?

In the clutch sidecover as I recall

All this info is for my '03 xt600, But I would think the same goes for yours

Hi,

This oil valve is in the crank case gasket face which is exposed when the right side cover (clutch side) is removed.

Years ago I think that I read on this site that this valve only prevents oil from draining out of the head when the engine stops, but the Kedo info says it prevents oil draining from the oil tank and into the engine. I wonder which is correct.

If you do replace this oil valve, you may need to remove the exhaust header to allow you to remove the banjo bolt that connects an oil pipe between the top of the crank case and the clutch cover. But this pipe was added some way through XT600 production, so not sure whether your engine wil have it.

I would be very interested to hear if changing this valve does reduceor stop oil draining out of the oil tank, as I also am having this problem with my 1993 XT600z 3AJ tenere

Mark

"I would be very interested to hear if changing this valve does reduce or stop oil draining out of the oil tank, as I also am having this problem with my 1993 XT600z 3AJ tenere"

Hi Mark,
1st experience was an engine that lost oil into engine overnight, rebuilt with new valve and oil pump, solved the problem. 2 years and 20000km later it still holds oil for days, does not leak. But inconclusive as both parts were renewed.

Now busy with 34l engine but never ran it before rebuild so no history but:
I have done a test with a stripped 34L engine where i assembled empty cases and the old well worn pump and check valve without clutch cover. Used ATF in the oil tank rigged high above. The experiment failed because there were no leaks!

Oil from the tank can 'leak' into the crankcase only via the oil pump and the check valve you mention, or via missing seal rings between engine cases. All oil from the pump must pass the valve, lifting the ball off its seat against the spring. Thus it is a non-return valve but also a forward check valve until pressure overcomes the spring.

I would always use a new valve seat, Yam part 583 13113 00, cheaper than most oil seals in the engine. Never use anything but the correct spring. The ball can be obtained from bearing suppliers, 3/8" diameter.

Interesting that the oil pipe to gearbox fitted to later engines may to start at silver case engines in 3AJs but not in silver case 2KFs.

Regards,
p