Thread: Crankcase ventilation.

I can't answer your question but have you looked into disabling EGR as generally, exhaust gasses combine with any oil vapour to clog the inlet tract. However the interaction of EGR and DPF burns could mean that disablig EGR isn't an option on these engines.

IMO towing 2 tonnes with a D300/D350 shouldn't require any modifications.

Doing those sorts of mods may/will also be an issue while the vehicle is under warranty,in case it has any warranty issues,no matter what the issues are.

Also same as Graeme has said the vehicle should easily drag that sort of weight around with no mods.

I tow a 2.8 t viscount with a 225 D350 with no problems, last year up Darwin/Kununurra areas the engine never went above normal but not sure of the transmission temps though. The D350 handled it with ease.

The EGR can be electronically disabled and enabled with no record.

The issue is blowby through the rings and down stroke pressure.

So at the moment when the piston travels down increasing pressure in the crankcase. The crankcase is vented through internal tubes through the block into the heads then into the inlet manifold.

The blowby through the piston rings mists the oil and that is what travels up to the inlet manifold.

So the egr let's in burnt gases into the inlet and the crank ventilation let's engine oil into the inlet manifold.

External crank ventilation it goes through a one way valve straight to atmosphere.

This eliminates pressure So the piston down stroke isn't fighting pressure and engine oil isn't entering the combustion chamber.

The reed/one way valve allows for consistent oil scavaging.

The auxiliary trans cooler will give the trans a longer life.

I also drive mine like a sports car and I tow pretty regularly at 2 tonnes and all 7 seats filled with the family.

Originally Posted by Trunksie

The issue is blowby through the rings and down stroke pressure.

ummm, unless IVe forgotten something important, its not a isolated journal engine, single, dual or triple. When one pistons coming down another is going up downstroke pressure is negligible.

Dont faf with the ventilation by porting it in ways it wasnt designed to be ported, fit a provent or similar into the system using existing portings.

Sorry yes the pressure is close to balanced.

But blow by still increases pressure and misting and i don't want it in my intake

Just do it and let us know how you get on.

RAM 1500 (ZF 8HP70 / 8HP75)
BMW X5 30d / 40i (ZF 8HP)
BMW X6 30d / 40i (ZF 8HP)
Jeep Grand Cherokee (ZF 8HP70 / 8HP75)
Audi Q7 3.0 TDI (ZF 8HP)
Audi Q8 3.0 TDI (ZF 8HP)

These all use the same trans as the disco and all have issues with overheating when towing.

The ram is renowned for overheating the trans and causing failure.

The fix is always an aux trans cooler