Thread: question relating to checkvalve - Provent and TD5

My setup would have +ve pressure inside the provent. The stop valve prevents oil traveling up the drain from the block.

Mine drains into a plastic bottle. So far I only have to empty it every oil change. But it only had about 20ml of oily crap. It took awhile before any oil even made its way into the bottle.
I have the checkvalve on it, but mainly because I thought I would end up loosing it if it wasn't attached to the Disco.

I agree with rar110. I think the check valve is only required if the return is above the oil level in the sump. It is to stop blow-by going back up into the provent.

ok and as my return line returns to a T peice above the flexy braided section of the turbo return feed (ie above the oil level) i need it..

However from what i read, the provent is under suction as the air intake pulls the gasses through the provent, therefore the check valve needs to close with suction to stop oil being pulled up through the return...

Or am i very wrong here? I'm just trying to work out which way round it goes... and what happens if the valve fails.. and as a side ... find out how much oil returns back down the turbo return line...

confused...

Steve

Steve, the check valve stops crank pressure from being pushed back into the Provent. As the drain is the filtered side of the PCV, it would essentially just go straight up the drain hose and into the turbo suction. The positive pressure would stop any gas flow through the actual element.

Position the check valve so it flows from the vent back to the engine. When engine is running, check valve will close and when stopped valve will open and drain any oil in it back to the crankcase.

Andrew


Using Capitals, the difference between helping your Uncle Jack off a horse or helping your uncle jack off a horse...

Mine drains oil to the same point as the oil drain for the alternator/vac pump. Oil could possibly flow back up to the Provent if the valve wasn't fitted.

I fitted a more modern tappet cover at the same time as the provent. Only a minute amount of oil is now venting from the top of the motor. I will also vent from the crank case - probably a lot more oil when I vent from there.