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Engine Discussion of preventative/corrective maintenance and other technical issues regarding your coach's engine.

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  #1  
Old 08-25-2019
LeRoy LeRoy is offline
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Default Cummins help needed

I need some insight from people with more experience with the 8.3 than me. We left Souix Falls this morning with everything fine. When we pulled into Rollag and shut down the toad was an oily looking mess. I thought it was oil at first, but it is clear now that it is fuel. I checked for loose items, wiped stuff down and started it back up. There is a pretty good bit of fuel coming out of/near the barrel on the injection pump that is closest to the rear off the coach(front of the engine). I’m unsure yet if it is coming from the connection between the line and the barrel or not. It got dark before I could put a wrench on the line to make sure it’s tight. Are there o-rings that I can replace? I would like to go get some parts and fix it where we are. Thoughts?
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Old 08-25-2019
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Randy Dupree Randy Dupree is online now
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Theres no Orings to change,the injector line is a compression fit,first thing is to put a wrench on it and give it a tug.
then wipe dry and run the engine,checking for leaks.
The injector line could be cracked,do not check for leaks by running your hand over the lines!!
I use baby powder,dust it over the lines and watch where it gets wet.
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  #3  
Old 08-25-2019
LeRoy LeRoy is offline
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I’ll do that first thing in the morning. I’m concerned it might be coming from the base of the barrel. But i’ll Know better in the morning.
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Old 08-25-2019
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If its coming from the delivery valve (base of the barrel) you need to find a diesel injection shop,theres a brass shim type thing and some Orings in it.
But,you need a special socket to really do it right,and you need that special shim if it cracked.
It is possible to use vise grips to unscrew the delivery valve,i have done it as a roadside repair,but it screws up the outside and i was lucky that time and it was an Oring.
I have had the brass shim crack and you can't fix it without a new shim.
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  #5  
Old 08-25-2019
DirtDigger DirtDigger is offline
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If anything like a 5.9 Cummins, definitely follow Randy’s advice and don’t put your hand near any fuel line. These have high pressure.
I had a bad leak once while driving down the interstate. Didn’t know about it until a diesel coated Corvette signaled to me. Luckily I was able to pull off. That leak emptied 35 gallons in about 3 minutes. Turned out to be a cracked pressure fuel line. Very common, as the dealer had many replacement parts and knew even which one I needed.
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Old 08-26-2019
Harold,Cat&Sam Harold,Cat&Sam is offline
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Default P-pump

Ours coated the toad with diesel one time . Turned out to be the mechanical fuel lift pump .
There is an inlet fuel line on the curbside of the injector pump and a return line on the pump between the pump and engine . I had to remove the AC compressor to get to the return line " overflow valve" .

We'll be standing by waiting to hear what you find this morning .
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Last edited by Harold,Cat&Sam; 08-26-2019 at 08:30 AM.
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Old 08-26-2019
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I am not an 8.3 expert, but I will be up there with my dad on Thursday, so if there's anything I can do to help just let me know. There should be no lack of tools up there, but you never know. We're coming up from southern WI. I'll PM you my cell.
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Old 08-26-2019
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Quote:
Originally Posted by badandy View Post
I am not an 8.3 expert, but I will be up there with my dad on Thursday, so if there's anything I can do to help just let me know. There should be no lack of tools up there, but you never know. We're coming up from southern WI. I'll PM you my cell.

Thats a good offer!
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  #9  
Old 08-26-2019
LeRoy LeRoy is offline
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I think we are back in business. John at Midland Diesel Service in Fargo had the parts on hand, told me what to expect and even loaned me the special tools and a torque wrench to use. It ended up being a failed o ring on the delivery valve holder. The holder was only finger tight when I dissembled it. I don’t know why that was, but it is torqued properly now. A test run didn’t show any leaks so my fingers are crossed and we’re only out six bucks. Thanks for the replies from everyone and offers of help.
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Old 08-26-2019
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buy a lottery ticket!
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