Post by ken on Aug 17, 2004 8:02:51 GMT 11
I have been interested in the engine fuming discussion and had a look at my setup. I have a 94 3.1 turbocharged Bighorn. On the top of the tappet cover where the hose connection leaves there is a diaphragm arrangement. Someone suggested that the crankcase normally operates on slight vacuum, well this diaphragm would stop that as there is a fine spring keeping it closed apart from a fine bleed hole. However it seems to me that when the diaphragm is fully open there is not much of a gap there for the gas to exit to the intake and could cause quite a build up in pressure.
Why is this device there? The only reason I can think of is for the budding submariners - to stop mud working into the engine by keeping a slight positive pressure there even when the engine is idling. Better to have a little oil out than mud in through the seals.
There is also a connection from the rubber hose to the inlet manifold via some kind of valve. Have you any idea what this does.
Also the drain hose from the tappet cover to the dipstick pipe. As there are already 8 holes from the valve gear to the sump via the push rods what good does it do?
Why is this device there? The only reason I can think of is for the budding submariners - to stop mud working into the engine by keeping a slight positive pressure there even when the engine is idling. Better to have a little oil out than mud in through the seals.
There is also a connection from the rubber hose to the inlet manifold via some kind of valve. Have you any idea what this does.
Also the drain hose from the tappet cover to the dipstick pipe. As there are already 8 holes from the valve gear to the sump via the push rods what good does it do?