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Allis Chalmers Discussion Forum
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AC 185 - bleeding the diesel fuel lines

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scotty b

02-05-2005 12:09:13




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I ran out of fuel and need to bleed the air out of the lines to get it primed again. Can someone give me step by step instructions on how to do it? I have seen it done once before but it"s been a long time.
Thanks for your help.




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K C in Ia

02-06-2005 15:05:32




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 Re: AC 185 - bleeding the diesel fuel lines in reply to scotty b, 02-05-2005 12:09:13  
If you have the single round screw on fuel filter.= Loosen the bleeder on top of fuel filter base a few rounds, locate the manual primer pump, start pumping, when fuel comes out bleeder close screw, now loosen 2 or 3 of the injection lines at the nozzles about 4 rounds each, make sure shutoff cable is in the run position, continue pumping for a while longer. Now if you have someone to help you continue pumping while other runs the starter. If by self start cranking the engine w/starter. Remember to reclamp the hand primer knob or it'll leak.

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Art19330

06-26-2006 13:21:46




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 Re: AC 185 - bleeding the diesel fuel lines in reply to K C in Ia, 02-06-2005 15:05:32  
KC, good information provided. Would you comment on this fuel situation for my 185 please? After bleeding lines (not at injectors, only at bleeder screws) and priming with pump, motor starts and runs for 2 minutes, then dies due to lack of fuel. I can pump again, and restart motor for same 2 minute time. Has my Rosa Master gone out? I did not run out of fuel before this situation occurred.



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scotty b

02-07-2005 09:36:16




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 Re: AC 185 - bleeding the diesel fuel lines in reply to K C in Ia, 02-06-2005 15:05:32  
I found the plunger and bleed screw on the filter. Is there a bleed screw on the fuel pump? I thought I might have to bleed the lines too, as you said, but want to make sure I do the right ones. There is a common line that goes to the top of the injectors and there are inidividual lines that come from the fuel pump to the front of the injectors. Which ones do I use? I am guessing that the individual lines are some sort of pressure lines that tell the injector when to open.

The owner's manual tells about the hand pump and bleed screw on the filter, but nothing else. The service manual doesn't say squat about it. In fact it says almost nothing about the fuel system.

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K C in Ia

02-07-2005 16:34:53




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 Re: AC 185 - bleeding the diesel fuel lines in reply to scotty b, 02-07-2005 09:36:16  
Some of Roosa Master pumps have bleeders but not all. This pump is where the Hi-pressure is made, then goes thru the 6 lines to the nozzles. But if you've gotten fuel up thru the filter and then pumped some more you've likely got fuel to the pump. The lines you want to loosen are the individual ones going from the pump to the nozzles in the cylinder head 3/4" wrench (I think). Do not loosen at the pump. The common line is the excess fuel return it joins a line from the top of injection pump and goes back to the fuel tank. With 2 or 3 of these loosened now you're ready to try to start engine, put throttle to wide open, crank for 30 second on 30 seconds off intervals until the engine starts, then throttle back to idle and retighten fuel lines.

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JMS/MN

02-05-2005 16:47:03




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 Re: AC 185 - bleeding the diesel fuel lines in reply to scotty b, 02-05-2005 12:09:13  
You should buy the operator manual. Beyond that, crack the injector lines loose and keep cranking.



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scotty b

02-05-2005 23:43:51




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 Re: AC 185 - bleeding the diesel fuel lines in reply to JMS/MN, 02-05-2005 16:47:03  
I have the operators manual but didn"t think to look there. I thought it would be in the service manual instead (but wasn"t). It looks pretty straight forward. Thanks.



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