silverstate55
Unemployable
- 2,075
- 873
- 113
- Location
- UT
I've got a LDT-465-1D motor. I've replaced all filters & fluids, then decided to replace all fuel lines since a couple of the nylon ones were cracked. I've drained my fuel tank, cleaned & flushed it, cleaned the in-tank lift pump & replaced the rubber fuel hose on it with a brand-new one, verified that it works quite well, flushed out all the stock fuel lines with solvent & compressed air.
I've refiltered the fuel, so it's good to go. I carefully disassembled the IP and replaced the 3 troublesome O-rings, then carefully reassembled everything. Everything seemed to function-check just fine. I made sure that the IP went back in on the engine just as it came out, and verified that all the timing marks lined up properly (engine timing marks set, both inspection plates on the IP removed & the timing marks were PERFECT, including the HH grooved tooth that was one tooth to the right as the TM spec'd).
I bled the fuel system at the secondaries, then cracked every injection line at the injectors to ensure fuel flow; plenty of fuel flow to the injectors. When I try to crank it over, the motor spins but it won't fire at all. There is a little bit of smoke vapor from the exhaust afterwards.
I then removed each & every injector, and disassembled each one. Each one of the back 3 injectors (4, 5, 6) were dry at the tip. I cleaned as much carbon & soot off that I could, and verified that the injector tip sprayed properly (put the straw from my carburetor cleaner can right down to it, and the proper 2-stream spray pattern comes out strongly). I am careful not to touch the parts I shouldn't with my fingers, and carefully re-assemble and reinstall on truck. I reinstall all return & injection lines, but still no fire.
I've had to recharge my batteries twice, I've run them down so much trying to start this stupid thing. I've got good strong fuel all the way up to the injectors, but no start. It won't even try to kick over.
I've got the fuel stop disengaged (pushed all the way in), and I've tried leaving the Accessory switch on for up to 30 seconds to ensure I'm getting plenty of fuel from the in-tank lift pump.
I've read all through these forums (where I've gotten some good ideas that I've already tried but with no success) and I've read through every TM I could download. The troubleshooting manuals say to simply replace the IP.
What am I missing? I feel so stupid right now, the truck was running just fine back in November when I parked it in my side yard. Now that I've rebuilt the dumb thing it refuses to start.
A couple of things I noticed are that when I turn on the Accessory switch, the fuel level at the bottom of the injector return line starts to rise, then falls and does this repeatedly; also, there is NO fuel coming from the injectors back into the return lines despite repeated cranking. Shouldn't some excess fuel be kicked back into the return lines?
Thanks in advance for any help, this is driving me absolutely crazy.
I've refiltered the fuel, so it's good to go. I carefully disassembled the IP and replaced the 3 troublesome O-rings, then carefully reassembled everything. Everything seemed to function-check just fine. I made sure that the IP went back in on the engine just as it came out, and verified that all the timing marks lined up properly (engine timing marks set, both inspection plates on the IP removed & the timing marks were PERFECT, including the HH grooved tooth that was one tooth to the right as the TM spec'd).
I bled the fuel system at the secondaries, then cracked every injection line at the injectors to ensure fuel flow; plenty of fuel flow to the injectors. When I try to crank it over, the motor spins but it won't fire at all. There is a little bit of smoke vapor from the exhaust afterwards.
I then removed each & every injector, and disassembled each one. Each one of the back 3 injectors (4, 5, 6) were dry at the tip. I cleaned as much carbon & soot off that I could, and verified that the injector tip sprayed properly (put the straw from my carburetor cleaner can right down to it, and the proper 2-stream spray pattern comes out strongly). I am careful not to touch the parts I shouldn't with my fingers, and carefully re-assemble and reinstall on truck. I reinstall all return & injection lines, but still no fire.
I've had to recharge my batteries twice, I've run them down so much trying to start this stupid thing. I've got good strong fuel all the way up to the injectors, but no start. It won't even try to kick over.
I've got the fuel stop disengaged (pushed all the way in), and I've tried leaving the Accessory switch on for up to 30 seconds to ensure I'm getting plenty of fuel from the in-tank lift pump.
I've read all through these forums (where I've gotten some good ideas that I've already tried but with no success) and I've read through every TM I could download. The troubleshooting manuals say to simply replace the IP.
What am I missing? I feel so stupid right now, the truck was running just fine back in November when I parked it in my side yard. Now that I've rebuilt the dumb thing it refuses to start.
A couple of things I noticed are that when I turn on the Accessory switch, the fuel level at the bottom of the injector return line starts to rise, then falls and does this repeatedly; also, there is NO fuel coming from the injectors back into the return lines despite repeated cranking. Shouldn't some excess fuel be kicked back into the return lines?
Thanks in advance for any help, this is driving me absolutely crazy.
![[thumbzup]](https://www.steelsoldiers.com/images/smilies/icon_smile_thumzup.gif "Thumbs Up [thumbzup]"){kind=icon}
