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  1. #1
    Road Train Member
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    Cummins ISX leaking oil and heavy CC oil smell

    05 Volvo with an ISX Cummins. I can visually see a wet spot on back of motor/head from drivers side. During exhaust braking I get a pretty heavy crank case oil smell coming into the cab. Anybody have an idea of what might have sprung a leak back there? Looking around on my Cummins QuickServe account I see there "may" be a block-off plate back there of some sort??? The wet spot is up high around the head area. Any up pipes for the Cac system back there?

    The motor doesn't seem to be using any oil, or not much at least. Oil changed last week, and I have put 2K miles on here in the last 4 days. Dispstik is still on full. But, its still wet on back of block, and every time I run the exhaust brake I have to crack the windows for fear of asphyxiation.


  2. #2
    Light Load Member
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    Seen alot of 05' ISX's leak there. Usually no effect on performance just leaks oil down the side of your motor. Just a headgasket will usually fix it

  3. #3
    Light Load Member pichu's Avatar
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    the air inside the motor cant come out when you use jake (inside is a big turbulence )one reason is the Elbow of the pipe is to small its like the size of my breather in my Toyota you need to change it to the size3/4 to 1" or big like a caterpillar size elbow and pipe and change the gasket because its burnt

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  5. #4
    Light Load Member
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    And like pichu said you need to enlarge your breather tube. It will help stop alot of other oil leak

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  7. #5
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    Haven't been back to the house to have the shop look at it. Hopefully its just a valve cover gasket. Otherwise I have been quoted 40-46 shop hours, $4 K for a new head, and another $1500 for a kit. Basically I am looking at $8K if its the head gasket!

    How would you guys enlarge the CCV on this motor? Yall got me wondering, since the CCV elbow was recently changed if theres some sort of restriction in it now. How hard is that front cover to remove? Would a top facing hole in the valve cover be a better solution?

  8. #6
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    Was it off really clean then run it up and look, be sure the vent is clean, you can remove the vent tube, and wash it out also. Find the leak then decide.

  9. #7
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    Rollin, btw. Yeah, no effect in performance. She runs like a champ, that stink just scared the hell outta me LOL

  10. #8
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    Seen lots leak but never needed a head to fix it

  11. #9
    Bobtail Member
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    mine has similar issues but is coinciding with a severe drop in oil pressure after 3-5000 miles, I don't have to change the oil just the filter and the pressure goes right back up for another 3-5k. Getting annoying and IS expensive I just tried lucas oil treatment to see if it would prolong the filter life but its not looking hopeful.
    However the stench from the exhuast when idling over night is unbearable!! sulphur and burnt gear oil is the only way to describe it. it comes and goes as it pleases.
    these two things are killing me! any advice?

  12. #10
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    Quote Originally Posted by 660hater View Post
    mine has similar issues but is coinciding with a severe drop in oil pressure after 3-5000 miles, I don't have to change the oil just the filter and the pressure goes right back up for another 3-5k. Getting annoying and IS expensive I just tried lucas oil treatment to see if it would prolong the filter life but its not looking hopeful.
    However the stench from the exhuast when idling over night is unbearable!! sulphur and burnt gear oil is the only way to describe it. it comes and goes as it pleases.
    these two things are killing me! any advice?
    what year and make is your truck? if it is older than a 2011 i have seen particularly in pb/kw 2010 models have exactly what you are describing, oil filters only lasting 5-10000 miles and oil press drop, what is happening is before 12/2010 the isx had a different piston design, and after time it let soot buildup in the engine and when it started burning it and coming loose, it clogged the oil filter and drop oil press. after 12/ 2010 they changed the piston design and seems to have taken care of the problem, this is only in the dpf engines 2008-present, i know this personnaly because i have dealt with the local cummins rep and discussed at length with him this issue had 2 trucks do it before i left the fleet i was working for and the updated piston change cured the problem, didnt seem to appear until the trucks had over 150k on them. just my .02

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