"B" series diesel novice - breater question

Joined: 08 Jul 2007 Location: Sunny QLD

left hand side of the engine, running from the block, just under the exhaust, is a tube down to the sump...
on my engine it has been cut off the sump, and the hole welded over, now this pipe just dumps onto the road!

im trying to find out what this pipe is, and why its been cut? if its some sort of breather, wouldnt that really bad for going through water?
any help is appreciated

Posted: Mon Jul 23, 2007 11:15 pm

I believe its called a blow by pipe, hasn't been cut thats how they are although I am trying to find if it can be rerouted any where.

BJ

But mines a 3B and its on the right hand side

Joined: 15 Feb 2003 Location: Shed.

that's how it is from factory. even brand new diesel truck engines have a blowby pipe that just sprays poo on the road.

you can block it off and plumb a breather from the rocker cover into the intake downstram of the air filter, this way the oil mist that comes out of there gets burnt, but if your engine has a lot of blowby it will make it smoke and push up your EGT's at full throttle. you can route the breather form the rocker cover into an oil catch can which will solve everything, as long as you remember to regularly drain the oil catch can.

cheers

DD

Joined: 04 Jun 2007 Location: vic

you must be looking at it from the front of the vehicle (left handside), as far as I know the 3B is modeled on the same block etc so BJ42 is your exhaust manifold on the rhs if sitting in the drivers seat?

Joined: 08 Jul 2007 Location: Sunny QLD

sorry about the confusion, yes it is on the driver's side.

there is a weld on the sump, right under it, i thought that may have been where it went in, also the end of the pipe looked like it had been cleaned up on a grinder, but if you think its factory, i will leave it alone.

its always blowing air, not sucking, and if i cover it, the preassure builds up against my hand, the air looks clean, not smokey or oily too.

Joined: 14 Jan 2004 Location: somewhere out there

the hole in your sump could of been from a turbo install there an oil return line goes back into the sump..

i found the blow by pipe keeps my front shaft well lubricated and rust proofed! Razz