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Allis Chalmers Discussion Forum

bleeding an HD3 Allis diesel?

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Mr. T. Minnesota

05-06-2014 05:31:56

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Forum Members,

Have been trying to start a '65 Allis HD3 crawler without success. About the only things left are did I bleed the lines at the right spot? Can anyone fine tune me on where lines should be bled ? Second thing is completely removing all fuel, mostly new fuel, and adding cetane to get a better ignition point for starting. Am about to give up on it if these things do not help!! Any and all thoughts are welcome.

Mr. T. Minnesota

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05-07-2014 19:47:23

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 Re: bleeding an HD3 Allis diesel? in reply to Mr. T. Minnesota, 05-06-2014 05:31:56  
A Rosa master pump won't be on a Detroit. They're a common rail two stroke. Putting air pressure to the tank isn't a bad theory as was brought up before. There should be a blender on the pump body itself. I usually end out cracking all the lines at the injectors on a rosa master system. If you have someone to crank it and you tighten up the nuts one at a time as fuel bubbles out while the engine is cranking seems to work best in my experience. Either in excessive quantities works good to but kinda brutal. Lol

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05-07-2014 07:03:18

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 Re: bleeding an HD3 Allis diesel? in reply to Mr. T. Minnesota, 05-06-2014 05:31:56  
If its like an hd5 it uses a Detroit. On the side of a Detroit there is a roots blower. Usually there is an air dam that is spring actuated to act as an emergency shutoff. A good many of these have made people think they have fuel problem. also according to tractor data they only made 30 hd3. Is that accurate?

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Mr. T. Minnesota

05-07-2014 13:42:05

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 Re: bleeding an HD3 Allis diesel? in reply to jr1983, 05-07-2014 07:03:18  

This HD3 is a '65 version. You are correct saying they made only a few HD3's in the '40s. This is a newer one made from 1960-68. Not sure what engine is in it, four cylinders with the
Roosa-Master injector pump.

Mr. T. Minnesota

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Randy Shoe

05-06-2014 06:45:09

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 Re: bleeding an HD3 Allis diesel? in reply to Mr. T. Minnesota, 05-06-2014 05:31:56  
Put air in the tank, seal with a rag, Loosen bleeds or injectors and force air out until straight fuel runs, or pull return fuel line off going back to the tank and put air to it with bleeds or injectors cracked. Not familiar with the particular system, but will work for most all.

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