Maerin
Guru
I had the injector pump (CAV DPA) overhauled and the injectors checked in MD. Shop I've used before. This in response to rough running, occasional hard re-start 45 min. after a long run at cruise.
The work seemed to help, smooth run for about 30 hrs. and the rough run returned. Pulled injectors & had a shop in NY check them, end result 5 were rebuilt, 80 hrs since pump work now. #5 was the worst. #5 didn't stumble as much on a crack test as the rest, and I could feel on the injector line that #5 seemed to pulse harder than the rest. Re-start issue gone.
All back in, better, seemed to run much smoother, decided to continue on trip. (Georgian Bay). After a day, still seems to be running rough, but not as bad as before. WOT is up where it should be, no smoke, a bit of sheen at idle. No blowby, soot near exh. at end of day's run, have to look for it- minimal. Had fuel analyzed by lab, no water, no bugs, but they did report that it's 4-5% bio-diesel, but should not create a problem. No water in bowls, polished for days through 10 mic filter, no water, filter barely discolored, no restriction indicated on filter gauge, <2" Hg.
I'm still getting a harder pulse on the injector line for #5, this by feel. I'm concerned about continuing to run- although the rough run is just enough to cause a vibration that can be felt-doesn't shake in the mounts, can hear the roughness in the exhaust, but it's random, not a rhythmic "miss". Haven't repeated the crack test since injectors were rebuilt.
The shop in MD is in touch with the NY shop, to their credit they are working with me. I'm suspect of the pump due to the correlation of the #5 injector issue with the pulsing I'm feeling. Pump overfeeding fuel to #5? I don't know enough about the internals of the pump to know if that's really logical.
Any suggestions on what I might be overlooking or what else I can do?
The work seemed to help, smooth run for about 30 hrs. and the rough run returned. Pulled injectors & had a shop in NY check them, end result 5 were rebuilt, 80 hrs since pump work now. #5 was the worst. #5 didn't stumble as much on a crack test as the rest, and I could feel on the injector line that #5 seemed to pulse harder than the rest. Re-start issue gone.
All back in, better, seemed to run much smoother, decided to continue on trip. (Georgian Bay). After a day, still seems to be running rough, but not as bad as before. WOT is up where it should be, no smoke, a bit of sheen at idle. No blowby, soot near exh. at end of day's run, have to look for it- minimal. Had fuel analyzed by lab, no water, no bugs, but they did report that it's 4-5% bio-diesel, but should not create a problem. No water in bowls, polished for days through 10 mic filter, no water, filter barely discolored, no restriction indicated on filter gauge, <2" Hg.
I'm still getting a harder pulse on the injector line for #5, this by feel. I'm concerned about continuing to run- although the rough run is just enough to cause a vibration that can be felt-doesn't shake in the mounts, can hear the roughness in the exhaust, but it's random, not a rhythmic "miss". Haven't repeated the crack test since injectors were rebuilt.
The shop in MD is in touch with the NY shop, to their credit they are working with me. I'm suspect of the pump due to the correlation of the #5 injector issue with the pulsing I'm feeling. Pump overfeeding fuel to #5? I don't know enough about the internals of the pump to know if that's really logical.
Any suggestions on what I might be overlooking or what else I can do?