7000 hard starting

gbs · Mar 5, 2022

Neighbors 7000 diesel with a Simms injector pump sat for 2 years and he couldn't get it to start, so he asked me to help get it started. From what I was told the injector pump was rebuilt and had less than 10 hrs on it, engine was completely rebuild several years earlier but has low hours. I found moisture had stuck the rack which took little effort to free up still wouldn't start even though the starter speed seemed to be adequate. Pulled the injectors, all were firing at cranking speed, pump timing checked, valve clearance checked, changed the pump oil it was ok, still would not start. As a last resort we pulled started it, it started belching white smoke but cleared up and ran good, allowed it warm up to operating temperature , shut it off would start again, pulled it again time the engine turned a couple rounds it fired up used it for a little while ,shut it off no start again, what have I miss?

Bern · Mar 5, 2022

Sounds to me like the rack is still a little sticky. To confirm pull the rack cover off and manipulate it by hand while you crank.

Dieseltech · Mar 6, 2022

What Bern said, sounds like one or more plungers are sticky and keeping the rack from moving freely. With the side cover off, set throttle wide open. Now work the stop cable in/out and see if the rack moves as it should. There's also a chance the plungers are fine, but the pump was built with the wrong lower plunger spring disc spacers, which will keep one or more plungers from moving freely too. Pump will need to come down again to correct that problem.
If rack does work OK, are you setting the throttle 1/3 open and then tripping the cold start button? That helps greatly on cold starting, if engine starts OK warm.

gbs · Mar 6, 2022

Rack moves freely, the extra fuel button was stuck also, I freed that up and it contacts the spring inside and returns on its own but has no effect on the rack, I tried moving the rack toward full open as far as it would go and held in place with finger pressure then press the button the rack didn't move but I could the button tab rubbing the contact plate of the rack. Don't know if some one has ground the tab down to gain extra fuel or what is taking place. Would it be possible that the max fuel screw is to tight not allowing enough fuel for starting ? I tried pulling the throttle from idle to wide open several times and each time I got a good response with a moderate amount of black smoke. Don't know a lot about these pumps, do they have some type of starting advance?

Dieseltech · Mar 6, 2022

There's no advance on those pumps, and if you get black smoke on hard acceleration the max fuel screw is not in too far. The cold start button won't do anything IF throttle is in low idle position, throttle lever MUST be open 1/3 or more for the cold start button to stay in when pushed. It SHOULD pop back out on it's own IF the linkage inside is working right after engine starts.

gbs · Mar 6, 2022

when I tried the max fuel button I had it at full full throttle position .thanks all for your help, looks like the pump is going back to the shop

7000 hard starting

gbs

Member

Bern

Well-known Member

Dieseltech

Well-known Member

gbs

Member

Dieseltech

Well-known Member

gbs

Member

Similar threads