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John Deere 310 problems

B

Bcdiesel

New User
Hello guys Im in desperate need of help from you gurus. So I have
i John Deere 310 3 cylinder. I originally got the machine non
running and basically needed a full engine overhaul. So I took the
engine apart and did an In frame rebuild. Next was the injection
pump. I took it apart cleaned absolutely every little piece. Did a full
rebuild on the pump as well. Everything looked good. Plungers
werent sticking and vent wire is free. Also has new governor ring.
My issue is after putting it all back together the tractor starts and
runs for a few seconds then dies. If i try to start it right after it dies it will just crank and crank and not start. But if I let it sit for a few mins its starts right up but does. I have tried just about anything.
Like checking return like glass ball.I have taken the pump apart 3
times already each time triple checking everything and all is good.
I have bypassed filter housing and run clean diesel from a jug. No
matter what I do it does the same thing. My only other option is the
injectors but I would like a second option before I buy a different
set.
 
Hello BC welcome to YT! I believe you have the CAV pump on that tractor, never been in one of those. I can tell you that if the tractor starts and runs or idles any length of time the injectors are not your problem. Fuel delivery from the pump is your issue. These YouTube videos of people rebuilding or resealing injection pumps have increased the bravery of some folks. Nothing against you personally but, not always but quite often the untrained and inexperienced poking around inside an injection pump has a less than stellar outcome. Hopefully a guy that posts here as Dieseltech will chime in here with some miracle revelation for you! He is an injection pump rebuilder.
 
Yea I actually downloaded a service manual for the pump and followed rebuilding steps from there. Its a JDB331AL-2406. Which is why Im lost. Everything was inspected and is within spec as far as Im concerned. Hopefully someone with more knowledge chimes in
 

I read where you checked glass ball to be sure it's not clogged but did you also check for clogged return line? Is fuel tank venting allowing air in as fuel leaves the tank?
 
Try this test, run engine and with a screwdriver handy loosen the two screw timing cover on the pump side JUST as engine begins to stall. If speed picks back up WITH the leak at the side cover, but stalls again with the cover tight there's a return restriction causing the trouble.
 
I have tried that. Ive run it without the rerun line attached and does the same thing. Ive also checked the fuel inlet screen and valve all seem to be working as expected. The metering valve moves freely. Not sure if theirs is any hidden regulator I missed but I followed the service manual and made sure to take out every little piece from the pumping head and hydraulic head. I also checked the vent wire assembly and the vanes on the pump all look to be good. It feels like it runs out of fuel and just dies. I tried to bypass the fuel filter and run it with a 12v lift pump and no success
 
Ok I performed your test. There is no effect when I unscrew the bolts and let some diesel out when it fires up. Just starts and runs for about 3 seconds.
 
(quoted from post at 11:32:30 01/03/23) Ok I performed your test. There is no effect when I unscrew the bolts and let some diesel out when it fires up. Just starts and runs for about 3 seconds.
Click to expand...


Are you sure that the fuel vane pump body is on right ( for instance, you have it in cc and it should be C, or the opposite?).

This could have been messed up before, the cotter pin on the pump cover should tell the location, but maybe it had been removed and not put right again?
 
Then it's not return fuel related. Recheck the fuel supply side, and if that's OK check the HYDRAULIC system. I had a Case backhoe do the same thing years ago, owner's grandkids were playing on the machine and locked one of the valves back. Engine would start right up and die quickly before the engine could rev high enough for the hydraulic relief valve to open. Sad thing is the owner brought me the injection pump TWICE which I found nothing wrong with BEFORE the locked back lever was found.
 
I know I said the injectors are likely not the problem, but I had another thought. I do not think it is a very common problem with pencil injectors but I wonder if one is not seating properly and is letting compression/air come back in the pump. Dieseltech should know if this is something that should be considered. You could test for this by disconnecting the injectors and crank it watching for bubbles coming out of the injectors.
 
Update: After disconnecting the coupler for the hydraulic pump the engine starts and runs perfectly fine. Thank you Dieseltech for the help!!! Now I just gotta figure out what is stuck in hydraulics shouldnt be too much of the a problem. At least I know the engine and injection pump work perfectly fine.
 
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