Crankcase Ventilation Fittings, etc.

[rich001]

Oh Greg, aren't we a smart one. With the spinny thing and water flowing and little bits of metal Everywhere. Now I dare you, double dog dare you, to include one of these works of art free with the top end oiler kits. THEN I would be impressed.

Truly great work. Will drool for hours.

Richard

[Steve]

OK, I am no master mechanic, but I do have a bit more than a basic grasp of mechanical concepts, and I am confused about these statements:

I think I need to do this as I'm pushing some oil from the shifter shaft seal. ... I really do think I'm building a bit much case pressure, & I figure it can't hurt.

and ...

I have a hose coming off the valve cover, routed back to just in front of the license plate.

It is my understanding that the vent at the top of the valve cover is open to the entire crankcase and should probably handle any pressure build-up caused by anything short of broken rings. How can you build up pressure when you already have a direct vent to the atmosphere?

.

[Greg B]

My thought is that the small size of the of the hole isn't letting the case vent fast enough.
Am I correct? I don't know.
Leak down on the motor looks ok, and it was rebuilt about 13,000 miles ago.
Again, I figure it can't hurt.

[Steve]

My thought is that the small size of the of the hole isn't letting the case vent fast enough.
Am I correct? I don't know.

I'll bet that if you put a pressure meter on that line, it won't show ANY pressure.

Your only source of pressure in the crankcase is blowby.
You say that leakdown is good and the engine was recently rebuilt.
You should not have any blowby.

.

[Greg B]

Very well could be.
But there are no perfect systems. When I leaked the motor down,
the test showed about 1-2%, which is totally acceptable.
Again, I don't know if this will do anything or not. But, I HAVE addressed
the seal & shifter shaft, so what will it hurt to try this?
Answer: It won't.