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Allis Chalmers Discussion Forum
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D-17 Dsl Injection Pump Problems

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Mike Kolstad

05-09-2005 10:32:49




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Hi There

I just got a 1957 D17 Dsl, It had a blown head gasket. It had sat for a few years. Well anyway, I fixed the head gasket and got everything back together. But, it seems that the injector pump won't prime. I have fuel up to the pump, but the pump won't suck anything in. If anyone has any ideas short of tearing the pump down it would be appreciate it.

Thanks

Mike




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D-17 Dave

05-10-2005 21:26:28




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 Re: D-17 Dsl Injection Pump Problems in reply to Mike Kolstad, 05-09-2005 10:32:49  
First the pump has to have fuel. Is there fuel flowing to the pump with the line off at the fitting on the rear of the pump. Next there is a wire screen filter under the fitting in the transfer pump where fuel line conncts. Remove this and check for rust/trash/blockage. If that"s clear, and your handy with small parts. Remove the 4 bend cap bolts that hold the endcap onto the rear of the pump. This will exspose the transfer pump vanes. If the pump was stuck and you cranked it, it could have broken the vanes. If they are OK then carefully pull the end-cap off the tractor and remove the screen again. Under the screen there is a couple of balance springs and a plunger. This is the fuel pressure regulator for the transfer pump. Make sure this plunger is not stuck from fuel varnish. If it all looks good, reassemble the end-cap. You"ll notice when removed it had some lineup pins in the houseing to stabilise the center fuel guide in the end-cap. You want to make sure this gets put back in the same place. Try to prime as stated above. Make sure the fuel shut-off is turned on, and the throttle is wide open. Loosen the injecter lines at the injecters and spin the engine over. This may take several tries as you don"t want to cook the starter. Maybe 90 to 120 seconds at a time. When you see fuel spurt from a few of the lines your in bus. Tighten the lines, reduce the throttle, and fire it up. If everything looks fine but it refuses to prime then it"s rebiuld time on the pump.

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Mike Kolstad

05-11-2005 11:27:11




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 Re: D-17 Dsl Injection Pump Problems in reply to D-17 Dave, 05-10-2005 21:26:28  
Thanks for the info I'll give that a try this weekend when I go back home. I've got the service manual so things should be ok. I've overhauled most types of 2-stroke and 4-stroke motors, but I'm new to diesels. If I have any problems I'll be back :)But again, thanks for help.



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Doc. 301

05-10-2005 21:16:35




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 Re: D-17 Dsl Injection Pump Problems in reply to Mike Kolstad, 05-09-2005 10:32:49  
Sometimes if a pump has sat a while with old diesel the metering valve will stick, simple fix you can do yourself with a lil guidance. But I have also had a couple that the delivery valve stuck from being gummed up, thats a little more involved. If you need any help, parts, whatever, drop me a line.



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Gatz

05-09-2005 15:00:57




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 Re: D-17 Dsl Injection Pump Problems in reply to Mike Kolstad, 05-09-2005 10:32:49  
before you tear into it...
Try loosening all the nuts where the lines go to the injectors just enough to crack the connection; then maybe one more turn.
Wobble the lines a little to allow any air to escape while cranking it over a number of times.
Watch the connections for fuel.
If it starts to run, shut it off right away and tighten the connections.
It could be that there's trapped air inside the pump and lines and won't provide any resistance to build up pressure.

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old

05-09-2005 10:52:32




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 Re: D-17 Dsl Injection Pump Problems in reply to Mike Kolstad, 05-09-2005 10:32:49  
A lot of times if a pump sits like that it will need to be rebuilt before it will work again. Seals dry out and gum up from sitting. Had the problem on a 190XT a couple years ago, boy did it hurt to have it rebuilt cost me $700



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