Solutions for crankcase breather tube?

[Island Moose]

I'll bet they all do it, but my crancase breather tube, which simply vents downward the ground from the engine, drips small amounts of oil.

In my effort to make her oil-tight, I'm thinking of ways to prevent this. Would I be causing a venting problem if I attach a foot of rubber hose, then curl it back up and zip-strap it to the breather pipe itself like a "p-trap"? What about some sort of catch can like the racers use?

 

[David*BJ70]

I plan to re-route in the frame... since 3 years... but never made it !

 

[Cruiser D]

I plan to re-route in the frame... since 3 years... but never made it !

I had asked a similar question in diesel tech as my blow-by tube puffs out alot of smoke and this concerned me.

I was told that the tube in question was a crankcase breather, although it appears to come out near the top of the engine (below valve cover)...

I was also informed that the diesel exhaust puffing out is acidic and would rust out the frame if vented here.

Other options discussed include venting it back into the air intake to reuse any unburnt diesel fumes. My 3B air intake has an odd little offshoot with a PVC "jug" just after the rad and before the air cleaner that goes nowhere and seems to serve no purpose that I can see. Perhaps this would be a good spot? May cause excess dirt in the air filter though.

 

[Greg_B]

I'll bet they all do it, but my crancase breather tube, which simply vents downward the ground from the engine, drips small amounts of oil.

In my effort to make her oil-tight, I'm thinking of ways to prevent this. Would I be causing a venting problem if I attach a foot of rubber hose, then curl it back up and zip-strap it to the breather pipe itself like a "p-trap"? What about some sort of catch can like the racers use?

Hi Moose

I've seen various discussions over the years about ways to deal with this.

The oil vapor is acid. I vented it into my frame, and 1 year later took it out. I've plans to cut the tube and leave a 1" nipple, then pipe it into the intake air between the filter and the intake manifold. The 13BT/12HT/1HZ/1HD-T all vent from the valve cover into the intake air (before the turbo on the tubo'd models) so I don't see it being much of a concern to do this with the 3B too.

hth's

gb

 

[Psilosin]

If you plan to pipe it back into the intake, I'd recommend adding an oil catch can into the path to keep the oily vapour from coating the walls of all the intake piping. The 2LTII engine I have vents back into the intake and yuck what a mess!!

Also don't buy the el-cheapo oil catch cans off ebay...they need to have internal baffleing (or at least the ability to stuff your own media like mesh scouring pads inside) to actually do anything. Most of the TypeR etc flashy ones on Ebay are just empty cans. The other thing to watch for is the inlet/outlet size...if that is too small (and most designed for little sports cars are) then you can not be relieving the pressure from the engine fast enough and cause problems.

Here's what mine looked like when I had it installed (now gone to make room for 2nd battery)...

 

[coldtaco]

If you intercool your turbo diesel, I would recomend getting rid of this breather hose from your air intake like the 13B-T has as all that oily mess will coat your intercooler and plumbing I just added a longer section of hose and have it dumped past the frame. The only downside to this is when slow going you might smell this stuff as it is blown up your way. You also could add a piece of hose long enough to run to the back of your rig so it vents behind you and then you might not smell it.