Question about crankcase ventilation

[Loghead]

I have a '97 2500 born with an automatic-converted to 5 speed.

I've looked on TDR and several other Cummins sites, YouTube and You Name It.

I can't find - on my engine - anything that seems to be a crankcase ventilation component.
I've seen diagrams indicating such components on the timing case cover, but not on mine.
I've seen videos and so forth telling of a draft tube exiting near the starter.
Nope.

If anyone can tell me where else I might look, other than the dipstick tube or leaky pan gasket, I'd love it.

Whatever I'm supposed to have, the beast is getting tired and though it still seems to run strong there's some blowby to contend with.

I'm considering the use of a dual valve cover breather assembly that, from what I've read, comes from the 3.9 Ag engines.
I'd just plumb a draft tube terminating at a vented bottle under the engine.

Any thoughts on that approach?

Thanks ahead of time.

 

[petersonj]

I believe the second generation 12 valve engine crankcase vent is located on the rear part of the tappet cover on the left side of the engine. One the second generation 24 valve engine, the crankcase vent is located on the timing cover.

Hope this helps.

- John

Stock CCV

Modified CCV.

 

[Loghead]

Thanks peterson.
I'll look there.

 

[BigPapa]

 

[Loghead]

I see no vent hose on my engine - which could explain the amount of oil I'm finding on the lower back of the engine.
Thanks BP

 

[Ozymandias]

Probably lost the hose.

 

[Loghead]

Probably lost the hose.

Somewhere - on some "what-the-heck-is-this?" forum - there's a picture of my draft tube.

 

[Joe Mc]

That leaking pan gasket you mentioned might just be due to the missing hose on the tappet cover. Although I have a 24v what I did to the CCV hose on the timing cover for mine was to extend the hose (in a downward slope) back to the transmission/transfer-case area. This way the oil mist doesn't clog the radiator etc. and provide that infamous 2nd gen auto chassis lubrication system. In your case, if you extend the hose/missing hose, you might not actually have a pan leak/weep.

 

[Loghead]

That leaking pan gasket you mentioned might just be due to the missing hose on the tappet cover. Although I have a 24v what I did to the CCV hose on the timing cover for mine was to extend the hose (in a downward slope) back to the transmission/transfer-case area. This way the oil mist doesn't clog the radiator etc. and provide that infamous 2nd gen auto chassis lubrication system. In your case, if you extend the hose/missing hose, you might not actually have a pan leak/weep.

I like the way you think Joe.
I changed oil pans a few years ago (plowing snow gets mud and salt crammed over the front axle which rusts the pan).
There's no polite way to describe that job.
After I changed the pan/gasket I hadn't seen much oil whatsoever. I was spraying Fluid Film on the bottom of the truck a few days ago and noticed alot of oil back there.
Scared me a little.

 

[Joe Mc]

Loghead, I can relate to the scared feeling of an oil pan R&R. Thank goodness mine still is not leaking and not rusted. Changing the oil pan doesn't look like a fun job and from what I've found from reading on this site, other sites and just looking at what would be involved, it isn't a job that appears to be ab easy one... Fluid Film is some pretty awesome schmutz!!! I got a gallon about 4 years back, did a brush on application to my truck, daughter and wife's cars and still have about a ½ gallon left.