AC 160 engine start
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=149641
Printed Date: 22 Jun 2025 at 4:57am
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com
Topic: AC 160 engine start
Posted By: combatww2
Subject: AC 160 engine start
Date Posted: 18 Apr 2018 at 11:07pm
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I have a 1972 160 diesel that I resleeved. It started, got warm then re-torqued the head bolts. Started it up again, drove it for about 15-20 minutes and parked it. It was working fine. I installed a new ignition switch and glow plug, cranked it over and it just kept cranking. Don't like to but I gave it a shot of starter fluid and it did nothing to help. Mot even a spurt. I'm at a loss to whats wrong. Cranks over. has fuel. ????? Anyone have any clues?
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Replies:
Posted By: TramwayGuy
Date Posted: 19 Apr 2018 at 6:33am
Do you get smoke when you crank it over? You will, if you actually have fuel.
You say you installed a new ignition switch — perhaps you didn’t get the wire to the diesel shutoff where it belongs.
Did you check the valve clearance after retorquing the head bolts?
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Posted By: combatww2
Date Posted: 19 Apr 2018 at 7:29am
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Yes, there is smoke. Yes, checked valve clearance. I will re-check the wiring on the switch. Thanks for the reply. I'll let you know how I make out.
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Posted By: combatww2
Date Posted: 02 May 2018 at 6:05am
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Checked wiring, everything checks out. I had replaced pre-heat elementas well and that checks out and working properly also. Could the fuel pump timing gotten out of sync somehow? The tractor was running after I had retorqued the head bolts before I parked it.
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Posted By: injpumpEd
Date Posted: 02 May 2018 at 7:08am
Pump has a cable to shut off right? Make sure you're in the run position at the pump, and the cable didn't slip out of position. If that's all correct, look at the bolts that drive the pump. Had one customer call me with a similar situation, and he must not have torqued the bolts properly, because they all 3 fell out! lol!
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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: BrianC
Date Posted: 02 May 2018 at 8:16am
The only time my 160 failed to start (aside from dead battery), it involved the fuel shutoff. In my case it was internally gunked up and was stuck in off position. I had no smoke during cranking.
I would crack loose the supply pipe at the injectors, and visually verify each injector is getting fuel. If it is pumping, well today it will be 80 degrees, it should start.
A few things- This injection system is old school, all mechanical.
The glow plug is called Thermostart, an intake manifold pre-heater system. It is plumed into the fuel system. But I can't see how it's malfunction can cause loss of injection pump prime. Ether caused no reaction? Anyone ever seen that? There would have to be no compression.
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Posted By: injpumpEd
Date Posted: 02 May 2018 at 10:40am
Was running, shut off, worked on it, then tried starting? Or was this over the course of a few weeks/months? If it's sat, the pumping plungers could have stuck, thus not pumping. I've found many times that ether will only fire the engine if there's some fuel being injected, won't run on ether alone. My bet it the pump is no longer turning due to the bolts falling out. Gears rotating may have held it in place, but once shut off, you lost the retention from the helical gears, thus it just pushed away missing the little dowel.
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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: combatww2
Date Posted: 21 May 2018 at 5:18am
Sorry for not getting back to anyone sooner. I replaced the head gasket on it, started and ran fine, shut it down and retorqued the head bolts after it warmed up, restarted it and drove it for about 20 minutes, parked it and changed the ignition switch and then it would not start.
It is getting fuel. It cranks over ok. Switch wiring is correct. Fuel shut off is in correct position. Tried it when outside temp was sunny and hot. Still no start. |
Posted By: Kcgrain
Date Posted: 21 May 2018 at 12:12pm
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You sure your working with an Allis Chalmers 160 tractor? There is no preheat elements on a 160, it has a perkins diesel in them that used a flame thrower type preheater, which you might just as well unhook youll never use it.
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