Birken Vogt
Charter Member
I have a 4024 powered genset in the shop for a simple checkup. I have seen this unit before, no trouble noted at the time. That was a couple years ago. 456 hours total. 4024HF285 PE4024L139816. It has sat for years.
When I went to change the oil, first I noted the dipstick was high. Chalked it up to oil overfill. But when I drained it, it came out thin like water and smelling of hot diesel fuel. Removed valve cover and insides smell like diesel as well.
This is where it gets frustrating. Put ~10 psi air pressure to the fuel system to see if I can see a leak, nothing. Put dye in the fuel filter and ran it with black light, nothing obvious. The only clue so far is that the #2 Allen head injector pump hold down bolt appears to have dye creeping in from the sides slowly and the meniscus of oil that is present on the other Allen heads is not present on this one, it looks flat or indented a little. I can't figure how fuel would get there since it is high up and not directly under anything that could leak fuel. I looked all around the injection pumps, lines, and injectors while it was running with dye in it and a black light and saw nothing else.
This one has electronic injectors, no rack, but it has high pressure lines with nuts. When I went looking up the fuel system on this I saw fixed pump/line/nozzle assys with no nuts, maybe that came later.
I suppose it could be leaking out the bottom onto the camshaft or leaking from the transfer pump and I would not see that.
I have a sample pulled for SOS shortly.
Ran out of time today so no further observation done.
When I went to change the oil, first I noted the dipstick was high. Chalked it up to oil overfill. But when I drained it, it came out thin like water and smelling of hot diesel fuel. Removed valve cover and insides smell like diesel as well.
This is where it gets frustrating. Put ~10 psi air pressure to the fuel system to see if I can see a leak, nothing. Put dye in the fuel filter and ran it with black light, nothing obvious. The only clue so far is that the #2 Allen head injector pump hold down bolt appears to have dye creeping in from the sides slowly and the meniscus of oil that is present on the other Allen heads is not present on this one, it looks flat or indented a little. I can't figure how fuel would get there since it is high up and not directly under anything that could leak fuel. I looked all around the injection pumps, lines, and injectors while it was running with dye in it and a black light and saw nothing else.
This one has electronic injectors, no rack, but it has high pressure lines with nuts. When I went looking up the fuel system on this I saw fixed pump/line/nozzle assys with no nuts, maybe that came later.
I suppose it could be leaking out the bottom onto the camshaft or leaking from the transfer pump and I would not see that.
I have a sample pulled for SOS shortly.
Ran out of time today so no further observation done.
