if you're vacuum pump springs a leak

[swank]

take a close look at where the oil's coming out. if it's at the red arrow, all your going to need is a new o-ring . found this out last night. i was losing 3-4 qts of oil in 2hrs drive time. got the seal/gasket/o-ring kit from cummins for 7 bucks and started taking things apart. when i separated the set-up at the red arrow (good place to start when everythings on the truck, only 2 bolts) i found that the o-ring was as brittle as hard candy. i took the vacuum pump completely off and investigated/cleaned it though. couldn't find where the seal would go on it, so i'm guessing it goes somewhere near the blue arrow. put the new o-ring on, bolted 'er back together and surprise! no more leak. soaked the underside with simple green for a while and then down to the car wash to get rid of the few GALLONS of oil under there. problem solved.

dave
pic here

[UPNSMOKE]

Yes The Seal Goes At The Blue Arrow. It Seals The P/s Pump Coupler

[swank]

btw, here's the cummins part # for the "kit" (gasket, seal, o-ring) that should cost about $7.42 straight from cummins. $50 or so if you let mopar put their sticker over the cummins one on the EXACT SAME package.

4089742

[Paccool]

Swank, Thanks to you and Tom for the info you have entered in the first gen tech section. All info is great, need more!

The only thing I would add on this one is to be careful when removing the seal from inside the vacumn pump housing. It (the housing) is aluminum and scores easy.

How do I know??? Don't ask!

[swank]

i heard about that, but didn't have to do it on mine.

[R-N-R]

Mine is seeping (slow drip) from the red arrow. Thanks for the info and the P/N!