i have a 98.5 3500. the truck is leaking oil from the crank case breather on the back of the motor. when i run the truck normally it barely leaks. actualy its a small drip about 16 seconds apart. when im pulling my trailer it dumps out. the other night i went about 400 miles and went through four gallons. a few people said its a broken ring. the only reason i am questioning the thought of a broken ring is the fact that the truck runs perfect. no smoke, no performance loss, nothing out of the ordinary in the drive or idle except the oil dumping out. anyone else experience this? anyone have any suggestions before i have the motor ripped apart?

sounds like to much cranck case pressure could be blowby

hotcummins's Sig:

its a 12valve with a few performance adders

I would say blow by i dont have a breather on myn it has a screw on cap that are sometimes found on the 12v but every once in awhile if i worki it hard i will get some blow off not much but some

NCFPD's Sig:

98.5 Dodge 2500 quad QC 24v cummins,5 inch stacks, K&N BHAF, silencer ring MIA, Hypertec max energy,Raptor 150, SFI approved flex plate,Billite torq conv. cover,Shift kit. 285/75/16 MT's Plenty to come

would it be ok to route that crankcase breather back into the intake? you know, like the gassers do. i realize you would have to go after the grid heaters, or delete them. anyone opinions?

take out a freeze plug and re routre it back into the motor. just read around on here there have been trucks on fire just cause a little oil leak from the turbo so dont mess with the grid heaters. and 4 gall of oil in 400 miles all going into the intake
is there any way you checked your coolent to make sure you dont have a leak back into the motor and causing to much fluid in the motor so its blowing it out?? Im not really 100% sure what it could be with just the info iv heard. but dont run it into your intake

ja-mudder's Sig:

1999 Cumm'a'long AFE intake,hx35 w/ring MIA, Air dog 150, 1/2 fuel line, 275 RV, Edge Comp, ATS stage 3 trans w/billit, 4'' straight, Blue Chip X pump, AR 17'' rims, 35'' SST Swampers,Day lighters, and more
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Welcome to Diesel bombers! Thanks for the resurfacing of the asphalt on the interstate!! four gallons is a lot.I would suggest a compression test.

Jet A Fuel's Sig:

1999 Dodge 3500 Quad cab 2wd NV4500 Manual trans w/ full splined output shaft, RV 275 injectors, AirDog 150, Edge EZ,ValAir Kevlar 13" conversion, Auto Meter gauges,K&N air filter.
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im with Jet. get a compression test and also check for exessive blow by from oil filler cap

What crank case breather on the back of the motor?

The 98.5 has the breather on the front of the motor on teh timing cover.

i have a tube on my 98.5 back on the side of my 24v right around the stock lift pump and it leaks oil like a blow by not much but some

If you have a 24V and the crank case vents anyplace then right down the front of the bock somebody has cutomized somethin or your lookin at the wrong parts here. From the factory the blowby comes out of a round cap about 1 inch deep and approx 3 inches across with a tube comin out the bottom of it right on the front of the timing gear cover behind the fan and drains straight down a tube that is attached to it.

If you went through 4 gallons in that few a miles and this really is oil leaking out of the blowby, odds are pretty good that motor is done and ready for rebuild. If it's got that much pressure it should also be blowin the dipstick out to.

Uncle Bubba's Sig:

99 Quad Cab, 4wd, Drag Comp W/Pump Wire & Boost Elbow installed, K&N Air Canon, MBRP exhaust, Belt Drive Lift Pump and bottom Bulkhead feed from the tank, Isspro EV Pyrometer, Boost Gauge, Fuel Pressure Gauge, DT Pro Fab Trac Bar, South Bend 13-1.25 Con O Clutch, Ranch Hand Bumper, Borgeson Steering Shaft, Black Silicone Boots, 2" Lift Soft Ride Front Coils, Solenoid High Idle Kit, Bilstein 5100 HD Shocks, Rickson 19.5 Wheels w/Hancoock Rubber, HD Maxx Link Sway Bar Links, Superlift dual front stabilizer, EGR Brakes Front and Back, RV275 Injector's, Blue Chip VP44, Prodigy brake controller, B&W Gooseneck hitch and more I can't remember right now. Not to mention more to come I'm sure.
374.2/846.7 at 30psi

First thing, I would check would be your vacuum lines. Make sure that they are connected.
If these are cracked or broken, it can cause a lot of crankcase pressure.
A compression and leak down test would be the next thing I would do.
Good luck.

Yea i talked to a guy thatworked for cummins and he said that some not many but some of the early 24v had the close cap on the front and the blow of coming out the driver sid rear above the starter and it runs between the starter and the block and thats what i got

Ten years a fightin with these things locally here and on a number of boards and it's the first time I ever heard a that. Doesn't make it impossible to be the truth so who knows.

yea very true and i though it was something that was riged up and i didnt have to describe it he new exactly what it was and that it ran between the starter and the block like he was looking at so i believed him but what do i know

The only tube in that area that I can think of is the water drain for the fuel filter. But I imagine the OP knows the difference between Diesel Fuel and Oil.

Can you get pictures of this? I would really like to see one of these as I have never seen or heard of one before this. Does this come off one of the side covers?

To the OP are you sure it is coming out of the breather? Not like the valve cover maybe or anything else? With the engine running and you hold your hand to the tube can you feel a lot of flow or pressure? If your sure the oil is from the breather tube then I would get a compression test done just to check.

kazairl's Sig:

02 6 speed High output 4.10 gears AFE stage 2 Intake AFE 4" straightpipe Edge Jammers 100HP Injectors Quadzilla Adrenaline BD short shift 285/75 R16 Wild Country A/T on Eagle Alloys Some aftermarket speakers and a couple subs