Ok,I consider myself somewhat knowlegable on my engine. Some history first,I drove to Springfield IL to pick up a trailer,delivered to KS,noticed that vaccum pump to front case was leaking,went to my local cummings dealer for gasket(not a big deal,done several times before). Left to pick-up a trailer in Des Moines going to SD,truck purred like a kitten for 130 miles at 72 mph,loaded trailer and headed out,30 miles later felt a miss,loss of power,pulled in to a fuel stop a mile down the road,lifted hood to see oil all over the place(never lost good oil pressure(40-45 psi)20 psi at idle,shut truck down.Found that oil was leaking from push rod cover(this is where I get confused)it looked like something had blown/forced the gasket out. Trailered home,tore into it removing everything that would hamper a good inspection including VP and found nothing that would have caused this to occur.Timing is correct(as far as I can determine,have turned to #1 TDC,everything in line)no bent push rods,dropped valves that I can see.Not wanting to pull head,YET,just trying to figure what could cause enough pressure in crankcase to blow this,and I admit I'm lost.Yes I could replace gasket,but need to figure out the cause.

Crankcase vent plugged up? :shrug:Did the hose freeze shut on you causing the crankcase pressure to build up.

  Mopar1973Man said:

Crankcase vent plugged up? Did the hose freeze shut on you causing the crankcase pressure to build up.

X2 Or the mechanic loosened the nuts hoping for a return. Sent from my SCH-I500 using Tapatalk

  silverram323 said:

X2

Or the mechanic loosened the nuts hoping for a return.

Sent from my SCH-I500 using Tapatalk

Mechanic was me,and I don't like returns:moon:.

--- Update to the previous post...

  Mopar1973Man said:

Crankcase vent plugged up?

Did the hose freeze shut on you causing the crankcase pressure to build up.

Was to warm at the time. So I am going to dig further into it.

Moparman stated in one of his articles that if a vacume line is left disconnected the vacume pump will act like a compresser pumping air into your crankcase. Check vacume lines??

I also second a possible plugged vent. If you have the vent hose extended, which I'm sure you do, maybe a drooped section puddled oil.

Or the hose got soft and mushy and now folding over in the wind...

  Mopar1973Man said:

Or the hose got soft and mushy and now folding over in the wind...

thanks for all the input,but none of the above apply. Vacuum hoses are intact,crank case vent is good. like i said I'M CLUELESS. Guess I'll have to dig deeper(not what I wanted to do.:banghead: .