AC 200 Injection Pump
Printed From: Unofficial Allis
Category: Allis Chalmers
Forum Name: Farm Equipment
Forum Description: everything about Allis-Chalmers farm equipment
URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=46766
Printed Date: 30 Aug 2025 at 3:47pm
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Topic: AC 200 Injection Pump
Posted By: old mack
Subject: AC 200 Injection Pump
Date Posted: 06 Mar 2012 at 2:13am
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I installed a rebuilt injection pump on my uncles 200. It is the early serial number so we timed it to 24 degrees btdc. After we primed the system we started the tractor. We finally got it to fire, but it would not rev to high idle. After running for a minute or so it began to rev up a little then something gave way and the tractor quit. We decided to check the timing again and when we pulled the cover off the pump and began turning the motor to 24 degrees, we noticed the pump was not turning with the motor. So we removed the gear cover from the timing cover. The gear and the injection pump shaft are turning in the front. We are assuming that the shaft either broke, it slipped out of the slot in the other end of the pump, or something broke internally on the pump. Either way we can't find any timing marks on the pump drive gear or the idler gear it is driven by. How can we set this up so we can pull the pump off and see whats going on?
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Replies:
Posted By: stray
Date Posted: 06 Mar 2012 at 4:49am
You should be able to pull the valve cover and rotate the engine tell #1 is coming up on compression, both rockers loose. Then set you timing marks on 24 degrees and then you can pull the pump.
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1969 190XT series 3
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Posted By: DrAllis
Date Posted: 06 Mar 2012 at 6:22am
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Sounds like the pump head has siezed. If you remove the #1 line from the pump head and gently move it just out of the way, look inside the hole and turn the engine over. At some point (if the rotor shaft is really turning) you'll see a discharge hole pass by the line hole. If you never see any hole pass by, the head is siezed and junk. I doubt that your pump rebuilder will eat it. Did you do the injectors at the same time??
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Posted By: injpumpEd
Date Posted: 06 Mar 2012 at 6:26am
sure sounds like a seizure to me as well. Did you make sure there were 2 washers on each banjo bolt? Like DR says, did the shop work on the injectors? I have heads here. pm me if need help with this. Ed.
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210 "too hot to farm" puller, part of the "insane pumpkin posse". Owner of Guenther Heritage Diesel, specializing in fuel injection systems on heritage era tractors. stock rebuilds to all out pullers!
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Posted By: old mack
Date Posted: 06 Mar 2012 at 10:12am
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Thanks for the response. He did not get the injectors rebuilt. All of the copper washers were in. Thats not the news I wanted but I was thinking that might be the case. I'll let you know what we find. Thanks again
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Posted By: injpumpEd
Date Posted: 06 Mar 2012 at 12:34pm
why was pump rebuilt to begin with? Was yours rebuilt, or an exchange provided? Were you trying to time it with it running? Good luck, Ed.
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210 "too hot to farm" puller, part of the "insane pumpkin posse". Owner of Guenther Heritage Diesel, specializing in fuel injection systems on heritage era tractors. stock rebuilds to all out pullers!
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Posted By: MACK
Date Posted: 06 Mar 2012 at 9:43pm
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You said copper washers were in place. If they are copper that is the problem. They should be steel. Copper will mash too far causing the end of bolts to push the head into the rotor. MACK
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Posted By: ALLISMAN32
Date Posted: 06 Mar 2012 at 10:00pm
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Had a couple 7000's that the dowel pins that hold the front engine adaptor plate to the engine block had worked out and would cause the head of the pump to seize.Hard problem to find if not knowing what to look for. On the 7000's the dowel pins worked out of the block, i think there was one on each side that could do this. When we finally figured it out i drove a pin in, tapped the block with pipe threads and inserted a pipe plug. Not sure without looking if the 200 is made the same as a 7000. Actually maybe it was a standard coarse thread and a set screw in the hole to keep the pin from backing out.
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Posted By: DrAllis
Date Posted: 07 Mar 2012 at 6:13am
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200's aren't normally known for timing cover dowel pins falling out, but 7000's sure are. The cause is the side frames extending too far ahead of the engine and not being channel iron, allowing too much flex in some cases and working the dowels loose.
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Posted By: old mack
Date Posted: 07 Mar 2012 at 1:52pm
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injpump Ed- the pump is seized, is the head repariable or will we have to put a new pump head on it?
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Posted By: injpumpEd
Date Posted: 07 Mar 2012 at 2:34pm
pump needs to be torn down and rebuilt, again. I have driveshafts, as well as a good used head. Head will be pressed apart to determine cause of seizure. very rare to be able to reuse a seized head, though it has been done. Ed.
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210 "too hot to farm" puller, part of the "insane pumpkin posse". Owner of Guenther Heritage Diesel, specializing in fuel injection systems on heritage era tractors. stock rebuilds to all out pullers!
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Posted By: old mack
Date Posted: 08 Mar 2012 at 8:53am
Posted By: old mack
Date Posted: 08 Mar 2012 at 1:23pm
Ed, How much for a drive shaft and a used head?
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Posted By: injpumpEd
Date Posted: 08 Mar 2012 at 2:33pm
pmme and we can discuss.
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210 "too hot to farm" puller, part of the "insane pumpkin posse". Owner of Guenther Heritage Diesel, specializing in fuel injection systems on heritage era tractors. stock rebuilds to all out pullers!
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