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2-71 detroit/HD5G

Printed From: Unofficial Allis
Category: Allis Chalmers
Forum Name: Construction and other equipment
Forum Description: everything else with orange (or yellow) paint
URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=33421
Printed Date: 09 Jun 2024 at 10:41am
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com

Topic: 2-71 detroit/HD5G

Posted By: darrel in ND
Subject: 2-71 detroit/HD5G
Date Posted: 06 Jul 2011 at 3:55pm

I went and did some work on my recently acquired (but not home yet) HD5G yesterday, and just as a suspected it may do, the engine was a run-away when it started. I was able to shut it down with no problems, but I guess that the remedy for the run-away two stroke detroit is new injectors, right? Any one out there with some good advice or helpful hints on changing these injectors, or am I completely on the wrong track? I am kind of pressed for time, because I am sure that the lady who had the auction would like to see it out of her yard, and I would like to have it running, for easier loading and unloading when hauling it home. All help appreciated, thanks. Darrel

Replies:

Posted By: Coke-in-MN
Date Posted: 06 Jul 2011 at 4:09pm

Run away could be low fuel or stuck rack or governor.

Remove the rocker cover and you will see the injectors and the rail that controls them . the rack adjustment is getting both injectors to move the same amount at the same time when the linkage is moved.

Injector timing is done with a pin gauge to set the height of the injector piston to the top of injector body. a pin gauge is used for this or a depth scale on a vernier calaper could be used in a pinch.

As you move the throttle lever the rack should respond to the movement, if not look for binding in governor housing . By pulling the shut off lever it closes the fuel down all the way on the injectors through governor housing lever on top as well as air supply to blower.

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Faith isn't a jump in the dark. It is a walk in the light. Faith is not guessing; it is knowing something.
"Challenges are what make life interesting; overcoming them is what makes life meaningful."

Posted By: q4016lanz
Date Posted: 06 Jul 2011 at 6:00pm

Hi guys one of ours HD5s we check it before we started it the rack in the injector was stuck and the same on a 353gm we recently got the rack it was stuck wide open we pulled them out and cleaned them got the rack moving again it started and runs sweet hop this helps cheers john

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15 allis chalmers tractors

9 lanz bulldog tractors

2 water cooled deutz

9 john deeres tractors

14 Aus made orange chamberlains

I spent most of my money on old tractors I wasted the rest

Posted By: darrel in ND
Date Posted: 06 Jul 2011 at 7:25pm

Thanks guys, I hope to get back over to it soon and take the valve cover off and see what I see. I'll keep you posted. Darrel

Posted By: Coke-in-MN
Date Posted: 06 Jul 2011 at 9:16pm

One thing , they suggest replacing the injector lines IF they are removed from head or injectors. They are snug to fittings , NOT tight, the double flare fittings have a tendency to crack when torqued to much. Care is needed when working with them.

The linkage should move easily and the gear rack on injectors also should feel loose when moved.

Posted By: darrel in ND
Date Posted: 26 Jul 2011 at 10:27am

Update: There was one injector stuck. I put in two re-man injectors and she runs like a champ, except for the fact (as you will see in my prior post) that the steering clutches are stuck. Also, where is the serial number located on this outfit; I can't seem to find it. Darrel

Posted By: Coke-in-MN
Date Posted: 26 Jul 2011 at 10:33am

Srl # is on tag on lower right side of dash , small plate mounted there and also on rear case stamped into back face of the housing .. If it is a 5 G that will be covered by counterweight and not readable least easily...

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Faith isn't a jump in the dark. It is a walk in the light. Faith is not guessing; it is knowing something.
"Challenges are what make life interesting; overcoming them is what makes life meaningful."