8030 has an engine miss
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=155745
Printed Date: 25 Apr 2025 at 2:24am
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Topic: 8030 has an engine miss
Posted By: RickA
Subject: 8030 has an engine miss
Date Posted: 19 Nov 2018 at 9:16pm
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I have an early 80s AC 8030 that has suddenly developed a miss. Earlier this year I put a fresh set of batteries and a new fuel filter in. The motor was starting easily. Today, the outdoor temp was 40 degrees. I cranked the engine and it did not seem to get smoke right away like it usually does. I shot a little ether in the breather and it started and ran rough for about 20 seconds then died. I ethered it again and it finally started but ran rough until the engine warmed. I plowed a few terraces without issue, then it started to miss like it was lacking fuel. It never powered down, just missed. I looked over the injector pump for a leak and checked the air filter. Any assistance on what to look for as an issue would be much appreciated.
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Replies:
Posted By: HagerAC
Date Posted: 19 Nov 2018 at 9:21pm
Did you change both fuel filters? Ever drain the water from the first fuel filter? Maybe sucking air in the system somewhere. I have seen injector nozzles break the tip off also and that really makes them run rough
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30+ A-Cs ranging from a 1928 20-35, to a 1984 8070FWA, Gleaner R52
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Posted By: RickA
Date Posted: 19 Nov 2018 at 9:26pm
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No, I only changed the fuel filter next to the oil filters. I agree it acts like it is getting air in the system somewhere. I'll replace the other filter and see if it improves. Thanks!
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Posted By: HagerAC
Date Posted: 19 Nov 2018 at 9:46pm
Possibility that a fuel line could be cracked or possibly collapsed inside.
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30+ A-Cs ranging from a 1928 20-35, to a 1984 8070FWA, Gleaner R52
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Posted By: tornado8070
Date Posted: 20 Nov 2018 at 10:03am
Change all fuel lines
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09’ DT205B, 08’ DT220A, 83' 8070 MFWD, 83’ 8070 85’ 8050 MFWD, 83' 8030, 82' 8010, 85’ 6080 MFWD, 84’ 6080, 79' 7020, 85' M3 RWD, 85' 920 diesel,AC C-50 forklift.
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Posted By: DennisA (IL)
Date Posted: 20 Nov 2018 at 4:17pm
I had an issue where it was sucking air at the inlet side of the water separator. The threads were worn in the housing and letting the hose back out. Had to replace the housing.
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Thanks & God Bless
Dennis
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Posted By: jiminnd
Date Posted: 20 Nov 2018 at 4:34pm
Any blue smoke, I had one with bad injector and it scored a piston, then it missed.
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1945 C, 1949 WF and WD, 1981 185, 1982 8030, unknown D14(nonrunner)
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Posted By: RickA
Date Posted: 20 Nov 2018 at 8:18pm
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No blue smoke, but today I drained the water separator filter and then tried starting the tractor. Again it required ether and took a couple tries. Warmed it up and plowed a couple more terraces. Runs good, then misses. Runs good, then occasional misses. No real change from before. Will continue to investigate the possibility of a break of crack in the fuel system somewhere.
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Posted By: RickA
Date Posted: 20 Nov 2018 at 8:20pm
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I plan to replace the separator filter so will check out the inlet and outlet for an air leak. THanks for the tip.
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Posted By: RickA
Date Posted: 20 Nov 2018 at 8:22pm
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When you say change all fuel lines, are you referring to the line between the tanks and filters but before the injector pump? Are you suggesting an air leak or possible fuel restriction due to a plugged line?
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Posted By: MACK
Date Posted: 20 Nov 2018 at 9:30pm
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Have saw a lot of tractors with ambec pumps miss after shutting down on dino. Always come out of it after idling a while. Could be a governor problem as the governor does go bad on these pumps. MACK
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Posted By: RickA
Date Posted: 20 Nov 2018 at 9:49pm
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Thanks for the thought. I've got a friend that works on diesel locomotives that has worked on this tractor for me before. I'll be contacting him next week and will share this information as a possible issue.
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Posted By: DrAllis
Date Posted: 21 Nov 2018 at 7:19am
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Start by removing the belly guard and removing the fuel supply hose from the bottom of the left (main) tank and be sure fuel gushes out from the tank. You are wasting your time on anything else until you KNOW you have a good strong stream of fuel that can leave the tank outlet. Re-routing that same hose under the bellhousing is better than up and over the bellhousing like it was from the Factory. It can be shortened up some if you do this.
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Posted By: injpumpEd
Date Posted: 21 Nov 2018 at 7:39am
I've heard of the hose going around the front of the engine getting a hole rubbed through it too. Being on the suction side makes it hard to find a pin hole.
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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: RickA
Date Posted: 21 Nov 2018 at 8:17am
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Would it hurt anything for me to take the fuel line loose at the pump and blow air back through the line in case there is some gunk built up that needs to be dislodged?
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Posted By: DrAllis
Date Posted: 21 Nov 2018 at 8:45am
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The problem with that is you just blew it back into the tank where it could (one day down the road) plug the outlet again. I have had debris in tanks before causing what you are describing. Until you are SURE that it is open and free-flowing, anything else you do may be a giant waste of time.
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Posted By: allisrutledge
Date Posted: 21 Nov 2018 at 11:30am
Has it sat a while? Is alge possible?
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Allis Chalmers still exist in my mind and barns
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Posted By: RickA
Date Posted: 21 Nov 2018 at 12:34pm
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It gets about 100 hours of use annually. I use it in the spring to prepare seedbed on acreage I don't no-till. In the fall to disk corn stalks and plow terraces. Also have a mounted drill that I use for cover crop plantings with this tractor, and pull a fertilizer buggy. So the use is sporadic but spread out over the course of the crop season.
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Posted By: RickA
Date Posted: 21 Nov 2018 at 12:36pm
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And when I drained the water separator and changed the fuel filter I didn't notice any algae. Not to say it wouldn't be possible.
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