maahes
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- Lansing/Jackson, MI
I've been beating my head against the truck for over a week now. Still cant make it fire. Hopefully a guru can point out something simple I've overlooked.
Truck is a 71 M35A2, D turbo
Here's the symptoms: 1-5 were all in the same day, prior trips were short and had no issues.
1. Started stalling on clutch-in as the RPMs dropped below 500
2. When starting had to keep idle over 800 RPM or it would stall
3. Starting began taking longer and longer cranking before it would fire.
4. Eventually it would require a small ether hit to start, then as long as the idle was over 800 RPM it would run fine.
5. On the way home it apparently ran out of fuel, I thought there was enough as there was over 5 inches in the tank, added 2 gallons and got it to the gas station for another 20, ran fine the rest of the way home (15 miles)
6. Let it sit overnight and next morning would not fire still, did not try with ether as I was home and not stuck someplace.
Over a week of poking sticks at it here is what I've observed/done:
1. Replaced all 3 fuel filters, found secondary/final were missing parts and were not seating on the top of the enclosure to properly place filter between dirty/clean fuel uptakes. Got replacement parts and re-installed both filters.
2. Air bled system up to HH per the TM and other threads here.
3. Observed fuel returning through return lines to tank
4. Observed good bubble free flow from the bleed valve on top secondary/final filters (4 inch spout)
5. Removed center bolt from HH and observed fuel spout and pencil in the hole moving up and down when cranking but only about 1/4 inch of movement
6. Removed fuel cutoff cable cover and fuel shutoff rod, both moved freely as well as the lower arm that moved to the rear of the engine and sprung back to its original place.
7. Cracked injector lines 1, 5, 6 at injectors and observed fuel exiting lines during cranking
8. Removed all injector lines and observed pooled fuel in all ports on HH except 6 and 2 which appeared dry with considerable rust
9. Removed HH and found clip and small button shaped piece had fallen off bottom of spring mechanism, reattached, cleaned rust from ports 6 and 2, blew air in injector lines to ensure they weren't clogged, re-installed HH and injector lines.
10. Noted sheered nut on fuel shutoff rod (the rod that has the small tooth part that goes into the HH), all parts of the remaining rod appeared tight and moved freely, nut is still held in place by black clip and from wear marks appears to have been this way for awhile
11. Re-assembled all parts and re-bled lines up to HH
12. Charged batteries
Turns over great, no clunking or rough turnovers (not hydro-locked) but still will not fire. There is no smoke out the stack when its cranking, and I observe no fuel leaks. I've read mixed instructions on bleeding the injectors, some posts say do it then others say don't, I leaned toward the cautions "don't" side and only opened the line to see if fuel was actually coming out.
The only thing that didn't look right was #10 but that nut didn't seem to do much as the assembly was tight, however as I don't know allot about diesels Ill leave it to the experts.
Any help is appreciated, I've exhausted what I've found in the TMs and other threads.
On the plus side the GF says my hands are softer than hers from all the diesel!
Truck is a 71 M35A2, D turbo
Here's the symptoms: 1-5 were all in the same day, prior trips were short and had no issues.
1. Started stalling on clutch-in as the RPMs dropped below 500
2. When starting had to keep idle over 800 RPM or it would stall
3. Starting began taking longer and longer cranking before it would fire.
4. Eventually it would require a small ether hit to start, then as long as the idle was over 800 RPM it would run fine.
5. On the way home it apparently ran out of fuel, I thought there was enough as there was over 5 inches in the tank, added 2 gallons and got it to the gas station for another 20, ran fine the rest of the way home (15 miles)
6. Let it sit overnight and next morning would not fire still, did not try with ether as I was home and not stuck someplace.
Over a week of poking sticks at it here is what I've observed/done:
1. Replaced all 3 fuel filters, found secondary/final were missing parts and were not seating on the top of the enclosure to properly place filter between dirty/clean fuel uptakes. Got replacement parts and re-installed both filters.
2. Air bled system up to HH per the TM and other threads here.
3. Observed fuel returning through return lines to tank
4. Observed good bubble free flow from the bleed valve on top secondary/final filters (4 inch spout)
5. Removed center bolt from HH and observed fuel spout and pencil in the hole moving up and down when cranking but only about 1/4 inch of movement
6. Removed fuel cutoff cable cover and fuel shutoff rod, both moved freely as well as the lower arm that moved to the rear of the engine and sprung back to its original place.
7. Cracked injector lines 1, 5, 6 at injectors and observed fuel exiting lines during cranking
8. Removed all injector lines and observed pooled fuel in all ports on HH except 6 and 2 which appeared dry with considerable rust
9. Removed HH and found clip and small button shaped piece had fallen off bottom of spring mechanism, reattached, cleaned rust from ports 6 and 2, blew air in injector lines to ensure they weren't clogged, re-installed HH and injector lines.
10. Noted sheered nut on fuel shutoff rod (the rod that has the small tooth part that goes into the HH), all parts of the remaining rod appeared tight and moved freely, nut is still held in place by black clip and from wear marks appears to have been this way for awhile
11. Re-assembled all parts and re-bled lines up to HH
12. Charged batteries
Turns over great, no clunking or rough turnovers (not hydro-locked) but still will not fire. There is no smoke out the stack when its cranking, and I observe no fuel leaks. I've read mixed instructions on bleeding the injectors, some posts say do it then others say don't, I leaned toward the cautions "don't" side and only opened the line to see if fuel was actually coming out.
The only thing that didn't look right was #10 but that nut didn't seem to do much as the assembly was tight, however as I don't know allot about diesels Ill leave it to the experts.
Any help is appreciated, I've exhausted what I've found in the TMs and other threads.
On the plus side the GF says my hands are softer than hers from all the diesel!
