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Allis Chalmers Discussion Forum

AC D17 Diesel Injector Pump Issue

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11-05-2019 12:12:48

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Hey all,

First I would like to say this is a pretty great forum, and thanks.

I'm having trouble starting a D17, a 1950's model I believe.
I cleaned out the fuel valve underneath the tank and am getting good fuel flow up to the injector pump. However when cranking I do not get any flow from the pump to the heads. I've opened the bolts on the outflow side of the pump, to check for flow, without any luck. I usually crank in 10-15 second intervals.

Do you guys have any suggestions as what other things to check for before chalking it up to a rebuild?
Attached are some pictures.


Thanks for any help!


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11-06-2019 04:00:33

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 Re: AC D17 Diesel Injector Pump Issue in reply to t-man123, 11-05-2019 12:12:48  
Not sure exactly what's going on here, but your next best move is to throw a chain around the front axle and PULL START it. This will get the engine and injection pump spinning fast enough it should eventually start. If after a couple of miles it doesn't start, pull the pump. Have the D-17 in road gear and get the engine spinning above 1,000 RPM by your tachometer.

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11-05-2019 17:01:53

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 Re: AC D17 Diesel Injector Pump Issue in reply to t-man123, 11-05-2019 12:12:48  
Most older AC tractors are bass akwards on the fuel stop control, out is run, in is fuel off. When did engine last run? If it's been more than six months there's a good chance internal valves and plungers are stuck inside. I've been repairing lots more pumps like that lately, either due to water/rust in fuel, OR the save the planet Bio diesel...

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11-05-2019 21:46:20

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 Re: AC D17 Diesel Injector Pump Issue in reply to Dieseltech, 11-05-2019 17:01:53  
I forgot to mention, I did have the throttle lever pulled back. It's been over two months since it was run last. Are there any other ways to get that pump primed before pulling it? Thanks for the reply!

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11-05-2019 15:08:17

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 Re: AC D17 Diesel Injector Pump Issue in reply to t-man123, 11-05-2019 12:12:48  
Do you have the fuel shut off control knob pulled to the rear (run) position? Has the control rod come unhooked from the shut off lever on the pump? Have you tried loosening the injector lines at the injectors and leaving them loose while cranking?

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11-05-2019 21:55:43

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 Re: AC D17 Diesel Injector Pump Issue in reply to Jim.ME, 11-05-2019 15:08:17  
Yeh I had the shut off pulled to the rear. The control rod is attached to the lever; I'm pretty sure of it, but Ill double check. Yeh I loosened a couple of the lines at the heads. There seemed to be some residual diesel in one of the lines but she wouldn't smoke.

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11-06-2019 05:05:44

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 Re: AC D17 Diesel Injector Pump Issue in reply to t-man123, 11-05-2019 21:55:43  
Once when I had one that just would not prime I bought this little inline diesel pump on Amazon that I plumbed in and just connected to the battery with alligator clips. Got it running, took the pump back off and went on down the road.

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