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Old 03-10-2016, 04:50 PM   #31
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Looks like you're on the right track. I don't feel so baffled anymore. Get everything on that side of the engine spotless. Simple green and an old toothbrush work well but get it as clean as you can. Then start it up and let it idle while watching underneath. You might have to wait a few minutes but you should eventually find the leak.

Dragon pointed out the compressor is right there. The fuel pump is above that and both of those are capable of leaking oil from where they mount to the gear case.

If I had to guess, from the looks of the video, it look like the gasket between the gear case and the block is leaking . For your sake, I hope it's not, because that's a pretty labor intensive job. Best of luck to you.
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Old 03-11-2016, 04:21 PM   #32
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still trying to source some dye locally - Amazon will not ship to my PO Box all of the sudden?

can I use AC-leak dye instead? Anyone ever done that?
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Old 03-11-2016, 04:38 PM   #33
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As long as it is ester or mineral oil compatible. If it's pag oil based that's a no go. PAG oil won't mix with engine oil while the other two should.
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Old 03-11-2016, 05:37 PM   #34
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DRED!! I can help with the fuel leak.

O RINGS! My 16 y/o engine was leaking. If you have same engine mounted fuel filter the o rings will leak after they start to get hard from age.

The filter drain assy. has 2 inside. They get hard and leak.

The filter can. has a WIF sensor that has..............an o ring! In my case the sensor was actually leaking. On mine there's a block off plate for an optional fuel heater, that's got.....o rings! Even if it has the heater it has........you know

I picked up a box of assorted nitrile o rings and no more leaks!

Also make sure the filter can. gasket is OK.
Plus the intake/outlet lines have rubber coated sealing washers that can leak.

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Old 03-11-2016, 06:40 PM   #35
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DRED!! I can help with the fuel leak.


The filter drain assy. has 2 inside. They get hard and leak.

I had it figured to be the purge valve - from what I have read thought I would need a new purge valve



I picked up a box of assorted nitrile o rings and no more leaks!

Where did you get those?
I guess I need to spend some time on narrowing it down - great info
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Old 03-11-2016, 07:33 PM   #36
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I got the rings at harbor freight.

If it's like mine, remove the valve, unscrew the top and remove the plunger. there's o rings where the valve att. to the canister too.

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Old 03-11-2016, 07:41 PM   #37
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it can't be as easy as harbor freight?

My next question were gonna be....."where do you order parts for cummins?"
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Old 03-11-2016, 08:22 PM   #38
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I get some from Geno's, call them if you have questions, they're very helpful.

800-755-1715

There are lots of places online. I also do bus. with a local diesel performance shop.

https://qsol2.cummins.com
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Old 03-13-2016, 09:35 AM   #39
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After a visit to Harbor Fright, I am set for repairs on Monday



A lifetime supply of o-rings(hopefully)
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Old 03-13-2016, 09:48 AM   #40
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it can't be as easy as harbor freight?

My next question were gonna be....."where do you order parts for cummins?"
EBay is where I get most everything.
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