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Glow Plug Diesel performance, modifications, tuning, and repairs.

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Old 03-12-2014, 09:22 AM   #1
Full83size
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Default Leaking Cummins

03' 265 horse Cummins. 117,000 miles

When I got the truck (92,000 miles), it was just a tad bit wet on the passenger side of the motor just above the exaust flange. A cummins head friend of mine said it looked like a little bit of AF. Now its getting worse and I'm thinking its oil. It's spreading to the drivers side. Starts to get noticeable about two cylinders from the front of th truck, and progressively gets worse til it reaches the firewall. I'm about due for an oil change, and it looks to be about a quart low.

Side note. Every cummins that I've looked at with this low of miles is so clean that you could eat off it.... I also noticed that all of the painted letters on the top of the plastic head cover are pretty scratched up. I've never seen this on a cummins with this low of miles... Could be some idiot set something heavy up there at some point and scuffed it all up, on the other hand, could someone have replaced this engine with a higher mileage unit? How could I find out and know? Most of all, why the heck is it leaking so bad with only 117,000 miles?

Worth noting, I'm getting fuel vapor in the cab. I can't find any fuel leaks anywhere, and its not leaving any oil/fuel on the garage floor etc. My first thought when I saw the wet area around the fuel supply lines was a fuel leak, but it doesn't smell like fuel to the least bit.


Pass side:








Drivers side:


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Old 03-12-2014, 03:50 PM   #2
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Default Re: Leaking Cummins

Valve cover weeping?

A qt in 10,000 miles isn't an issue.
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Old 03-12-2014, 04:04 PM   #3
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Default Re: Leaking Cummins

I don't think so, it looks like its below the valve cover.
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Old 03-12-2014, 05:34 PM   #4
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Default Re: Leaking Cummins

Thats fuel
Oil would be must thicker and nastier
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Old 03-12-2014, 05:36 PM   #5
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Default Re: Leaking Cummins

How is it getting to the pass side of the engine?

Maybe my nose is all screwed up, but it doesn't smell like fuel at all? Could it be coolant?
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Old 03-12-2014, 05:40 PM   #6
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Default Re: Leaking Cummins

its creeping around either the front our the back of the head. fuel leaks will travel a LONG way
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Old 03-12-2014, 05:47 PM   #7
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Default Re: Leaking Cummins

Quote:
Originally Posted by yellowk20 View Post
its creeping around either the front our the back of the head. fuel leaks will travel a LONG way
I could swear that I saw it on the pass side first, but maybe that was a small coolant leak around the coolant plugs before the fuel got there, ive read that they are a common place to find coolant leaks.


So then, do you think it could be the fuel supply lines, where they meet the feeder tubes? Any common places that I should look? It's obviously a super slow leak. Should I clean it all up really good and then keep a close eye on it?
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Old 03-12-2014, 06:25 PM   #8
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Default Re: Leaking Cummins

Quote:
Originally Posted by Full83size View Post
I could swear that I saw it on the pass side first, but maybe that was a small coolant leak around the coolant plugs before the fuel got there, ive read that they are a common place to find coolant leaks.


So then, do you think it could be the fuel supply lines, where they meet the feeder tubes? Any common places that I should look? It's obviously a super slow leak. Should I clean it all up really good and then keep a close eye on it?
Could be coolant, could be two seperate leaks .


Go to Cummins and get some of there coolant dye then go by a black light. clean the hell out of it . and then drive it, get it good and hot then check it with the blacklight.

if that deosn't work go don and get the engine oil dye and do the same thing, if that doesnt work then its a fuel leak
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Old 03-12-2014, 07:39 PM   #9
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Default Re: Leaking Cummins

That is fuel. The smell youre getting in the cab is the fuel burning off from the engine getting hot. My 12v had a leaky line, and the places the fuel traveled had me chasing my ***. I suggest you clean everything, and go for a short trip. It might not leak until its up to temp. Also, it looks like the passenger side might be an exhaust leak.
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Old 03-12-2014, 09:14 PM   #10
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Default Re: Leaking Cummins

how dangerous is that potentially??
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Old 03-13-2014, 03:47 AM   #11
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Default Re: Leaking Cummins

Anytime you have a fuel leak there is a fire potential, that being said if things got hot enough under the hood to ignite diesel the truck would probably already be on fire lol
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Old 03-13-2014, 05:40 AM   #12
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Default Re: Leaking Cummins

Great. So my nose doesn't work anymore, and I have a fuel leak.... Time to get to work....
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Old 03-13-2014, 07:49 AM   #13
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Default Re: Leaking Cummins

Fuel could be slobbering out exh mani. For it to start 9 pass side then go to drivers side tells me you have 2 issues. If it is fuel that is causing wetness on pass side wipe it and smell it. Fuel is fuel period. It doesn't lose smell. Does truck smoke on start up at all? I have seen lower milage trucks like your that have high idle time and the rings never seated properly. They are still rounded. And it will slobber out the exhaust manifold. Or if an injector is leaking. It will leak down over night and when you first start up it will slobber and then clear up. Just a couple ideas. I would have to see it.
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Old 03-13-2014, 07:58 AM   #14
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Default Re: Leaking Cummins

I'm busy this weekend, but it would be great to get a second set of eyes on it. If any of you guys are commuting or passing by Peters Creek in the evenings and want to give it a sniff, let me know. Later next week would work better for me. Think I should clean it up first?

Thanks as always for help you guys. I'll try to look at it in the next few days but realistically I'll look at it next week and update the thread. "Always something" as they say, at least its something that time/money can fix.
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Old 03-13-2014, 12:09 PM   #15
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Default Re: Leaking Cummins

I had a freightliner with a fuel leak on the engine back in Wa. Your is leaking in the same place it was, head gasket maybe?
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Old 03-13-2014, 01:53 PM   #16
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Default Re: Leaking Cummins

you know you have good friends when they volunteer to sniff your junk !
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Old 04-11-2014, 11:28 AM   #17
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Default Re: Leaking Cummins

If you really want to find the source without a lot of guessing, pressure wash your engine, and use a detergent like Simple Green, let it dry thoroughly and spray with a foot powder like Desenex. It will turn colors (Gray instead of white) in the presence of oil. We used it for detecting minute leaks in very large transformers. Works every time. Good luck!
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Old 07-01-2014, 09:22 PM   #18
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Default Re: Leaking Cummins

Did you ever find the leak source?
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