ACC40 running rough
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=198577
Printed Date: 31 Oct 2025 at 12:15am
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com
Topic: ACC40 running rough
Posted By: Josh4God
Subject: ACC40 running rough
Date Posted: 06 Dec 2023 at 5:59pm
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I have an ACC-40 propane forklift that has been sitting in the corner of our hangar, not run for 3 years. Model # C 40 L PS Serial# AFR524866. I came on the job a year and a half ago, and recently decided to try and get it running. It is now fully functional, except for the alternator needing to be replaced. The engine runs very rough and sounds like it is misfiring. I checked inside and there was alot of water in the engine oil. #1 piston actually has a puddle of oil on top of the head. I would look for engine manuals, but I do not know the engine make or model as the sticker on top of the heads that was probably the label is completely worn off. I have seen several users on the forum talk about having a continental f163 in the same model forklift, but several things look out of place. I will be sending some pictures. Any help finding out the make and model of this engine, and manuals for it would be appreciated.
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Replies:
Posted By: Josh4God
Date Posted: 06 Dec 2023 at 6:17pm
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Posted By: Josh4God
Date Posted: 06 Dec 2023 at 6:18pm
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Posted By: Josh4God
Date Posted: 06 Dec 2023 at 6:19pm
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Posted By: Josh4God
Date Posted: 06 Dec 2023 at 6:20pm
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Posted By: steve(ill)
Date Posted: 06 Dec 2023 at 6:24pm
another view ------------- Like them all, but love the "B"s. |
Posted By: jaybmiller
Date Posted: 06 Dec 2023 at 6:29pm
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first guess.... plugs not wired up right ? I got a deal on D-14 #3, ran rough...just got onto trailer. get home, rewire plugs from 1-2-3-4 to 1-2-4-3, ran like a top ! ------------- 3 D-14s,A-C forklift, B-112 Kubota BX23S lil' TOOT( The Other Orange Tractor) Never burn your bridges, unless you can walk on water |
Posted By: steve(ill)
Date Posted: 06 Dec 2023 at 6:35pm
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fork trucks normally came with a Continental f135 , f163 or buda 153 .... NONE of the valve covers looked like that..... Is it aluminum ? Looks more like a small car engine ??
I would look all over that motor and try to find some casting number, stamping, or something that might lead you in the right direction. The engine runs very rough and sounds like it is misfiring. I checked inside and there was alot of water in the engine oil. #1 piston actually has a puddle of oil on top of the head. You might have a blown head gasket / etc... As Jay said... you might take compression ... roll motor over slowly with plugs out and figure out which pistons come up on compression in what order. .......... cleaning the distributor and point is a good idea.
------------- Like them all, but love the "B"s. |
Posted By: Josh4God
Date Posted: 07 Dec 2023 at 10:55am
Thank you both! I did not think about rewiring the plugs. I have already cleaned the distributor points but that was about a month ago when I started the project. I will check the firing order. Also, I found this FB27 number stamped onto the left side of the block. I included a picture of it. 
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Posted By: Josh4God
Date Posted: 07 Dec 2023 at 11:50am
| I checked the firing order by checking the order of compression strokes. They match the order in which the plugs are wired up. It is 1-3-4-2. It sounds more like it is the head gasket. |
Posted By: jaybmiller
Date Posted: 07 Dec 2023 at 3:42pm
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curiously.. 1-3-4-2 is 1-2-4-3 if you go the other way.... please humour me and try it Jay ------------- 3 D-14s,A-C forklift, B-112 Kubota BX23S lil' TOOT( The Other Orange Tractor) Never burn your bridges, unless you can walk on water |
Posted By: DiyDave
Date Posted: 07 Dec 2023 at 5:25pm
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That motor looks like an import, to me. Its a very late model, with that paint and tin, and I am not familiar with late model stuff. Is the dealer that is on the sticker still in business? If so a call to them, or whoever bought them out, might be get you some info... ------------- Source: Babylon Bee. Sponsored by BRAWNDO, its got what you need! |
Posted By: Josh4God
Date Posted: 08 Dec 2023 at 10:22am
| Yes, the dealer sticker is still on the truck. I will give them a call to see if they know anything about the engine. |
Posted By: Josh4God
Date Posted: 08 Dec 2023 at 10:23am
| I will give it a try. |
Posted By: Josh4God
Date Posted: 08 Dec 2023 at 10:43am
| I tried wiring it 1-2-4-3 and it would not start. After re-wiring it to 1-3-4-2 the engine started successfully. |
Posted By: steve(ill)
Date Posted: 08 Dec 2023 at 12:55pm
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the majority of engines are 1-3-4-2 ............. Allis and a couple others were 1-2-4-3. With that aluminum finned valve cover.. it sure look like a small automotive engine from 1980 . ?? ------------- Like them all, but love the "B"s. |