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Discussion Forum

Allis CA Problems

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Jeff Rose

06-23-2002 20:34:32

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I am Jeff Rose. Thanks for all the advice from all of you on my newly purchased CA, But I still need your help. If anyone could give me any mmore Advice on where to go next I would Appreciate it. This one has my Dad( a mechanic in the 50's and 6o's) and myself stumped. I will try to list what we have already done... hopefully in the order we performed the task. I had purchased the CA at an auction.Brought it home, ran it for a few hours of grass cutting. When I went to back her into the barn, I "Idled down" and noticed her surging bad. It was late so I figured I would check it out later. next Time I started her she was fine, ( I had changed the oil, checked the plugs, changed the oil breather, and check the radiator.) She idled just fine so I put a little gas in her( same gas is used on other equipment) She worked just fine for about 15 minutes of cutting than the surging came back. The only way to keep her running was to pull chock full out. She has no power to run PTO mower when you do that, so back to the barn. I was thinking maybe trash in the gas line, so I emptied the cinnamon bowl( not much trash there) , and blew out the gas line to carb. got her started , idles ok but surge came back when I went to pull her out of the barn. Found a carb kit at NAPA(although it was for a few different zenith carbs, not all the jets came in the kit.) Rebuilt the carb , blew out the lines, adjusted Timing. Emptied the gas tank and wiped the tank out as best I could. got her idling smooth, was able to cut for a few hours...then surge came back. so I figure trash from the tank. Back to the barn empty cinnamon. bowl...blow out the lines...still surges. At this point I think maybe leak in intake manifold. Get her idling ..spray wd 40 ...then carb cleaner around the intake. and no difference in idle speed. By now I have received your notes. so dad set the jet to where you suggested ... and did a little timing work.. and got her to purr like a kitten. ( that was yesterday..I had our son at ball tournament ) Dad took her out this afternoon tho test cut some grass. He drove to the end of his long lane...no problem... Turned on PTO. cut about 30 yards..and ..SURGE again!!! He played with her some out there. Air mix screw...timing .. nothing. We don't know what to do next. there does not appear to be any junk in the lines anywhere. I will try to find a new carb ...but if I am going to that expense,,, I want to know I am on the right track. Same if I try to find a better rebuild kit. It seems to us to be a fuel problem...But what??? I know this is quite a long note. And I expect to compensate you for your Time and Advice... But the grass is getting taller...and we don't know what to do next. Any help is appreciated and thanks Jeff Rose

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Gene [In]

06-26-2002 11:11:46

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 Re: Allis CA Problems in reply to Jeff Rose, 06-23-2002 20:34:32  
sounds like a bad ignition coil.

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06-25-2002 15:09:59

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 Re: Allis CA Problems in reply to Jeff Rose, 06-23-2002 20:34:32  
Jeff, Someone could have replaced your governor spring in the past with the wrong one. Wrong spring would give wrong tension could make it surge. The correct springs don't cost much. (anti-surge and governor). An in-line fuel filter can't hurt either and don't cost much. Grass going fast here. Good luck. Let us know what you find out. Dale

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Tom Westerfield

06-24-2002 19:41:04

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 Re: Allis CA Problems in reply to Jeff Rose, 06-23-2002 20:34:32  
Jeff, I'd bet on the spring too. Had the same problem. Couldn't believe that something so small would have such an effect, but it does. I put the spring on and it ran/runs like an antelope(I refuse to give reference to another cloven hoofed wild creature).

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06-24-2002 06:55:32

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 Re: Allis CA Problems in reply to Jeff Rose, 06-23-2002 20:34:32  
My WD was doing this a few years back (the exact same thing) and it wasn't the spring that time, it was junk in the tank. i filled the tank up for the first time in years and i guess that caused the old rust to break loose. it would slip through and get between the needle and seat. I put an in line fuel filter on and it's been fine every since. i know that rust in the tank sounds like kind of a generic answer but it really was for me. It would only run with the choke more than half way on. i blew compressed air up into the tank to disperse the rust that had gathered around the outlet....it ran just fine so then i took the tank off and cleaned it out. good luck

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Phil Auten (Tx)

06-24-2002 06:35:42

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 Re: Allis CA Problems in reply to Jeff Rose, 06-23-2002 20:34:32  
Also check the gas cap vent to be sure it isn't plugged. My B died suddenly after running for a while and wouldn't start. Turned out to be the vent in the cap. Also look down into the tank with a flashlight. There might be something floating around in there that blocks the outlet periodically and causes your problem. I've heard stories about rags, bugs (big ones) and just rust/dirt causing this same problem. Duey's suggestion to check the anti-surge spring is a good one too.

Good luck, and let us know what you find,

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06-24-2002 06:34:21

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 Re: Allis CA Problems in reply to Jeff Rose, 06-23-2002 20:34:32  
I have a CA that used to surge like that that had a mag on it. Had the mag redone and still the problem, went to a salvage yard and got good distribitor and it runs like a kitten even under long hard pulls[a grain bin auger]. We had kits in the carb new gas lines and sediment bowl, and it still surged. Just a idea. Harold

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Bryan Smith

06-24-2002 05:45:19

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 Re: Allis CA Problems in reply to Jeff Rose, 06-23-2002 20:34:32  
Make sure you have the spring Duey talks about. NExt, buy an inline fuel filter from NAPA or CarQuest (about $10 with hose and fittings) and install it. Clean out the carb and fuel line, then see what happens. That straner in the sediment bowl will stop large chunks, but it's better as a water separator than as a filter - small rust flakes still go through. The inline filter fixed the problems on my B quite nicely.

Clean out the inlet fitting from the gas tank too. Sometimes large rust flakes will go down into the fitting and restrict flow.

The fact that it runs fine for a while makes me believe that it's a trash problem and not a carb problem. You may also have some worn pins or weights in the governor - but I would say trash first.

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Duey (IA)

06-24-2002 04:42:08

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 Re: Allis CA Problems in reply to Jeff Rose, 06-23-2002 20:34:32  
You need an anti-surge spring. It hooks from a small hole in the throttle rod to the generator bracket.
This puts just enough drag on the throttle rod to prevent the surge. Duey

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06-23-2002 23:17:07

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 Re: Allis CA Problems in reply to Jeff Rose, 06-23-2002 20:34:32  
check your fuel flow at the tank , these older tractors have trouble with rust flakes breaking loose inside the tank, caused from sitting for periods of time with very little gas in the tank.
most tractors have a screen built in the fitting that goes up in the tank (looks like a upside down funnel) when trash gets built up around the screen enough, the problem you are having showes up. hope this helps Gordon-(TN)

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06-23-2002 20:50:33

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 Re: Allis CA Problems in reply to Jeff Rose, 06-23-2002 20:34:32  
Jeff: I was running my G Allis today and had the similar problem. The only way it would run was with full choke. My battery was not charging right and was almost not strong enough to crank it. Ipulled it to the shop and put it on charge. Do you think a low battery could be the problem? I will work with it tomorrow and see. Good luck.

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06-24-2002 19:51:37

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 Re: Re: Allis CA Problems in reply to Dave, 06-23-2002 20:50:33  
Sound about like my CA. Left 3 gallons of gas in it over the winter. Had the rust problem fixxed by sealing the tank. That was last year. Over the winter it came back again. If I was on alomost level ground it would run but very rough, then on hills going up them it would go dead and have to pull it with the old truck. My guess would be rust in the gas tank. Rember a small amount of rust is just enough to block thefuel line. I had a friend with a WD he got stick and files out of his gas tank.
If it is rust in the gas tank take it off the tractor. put rocks, bolts, nuts, gravel, any thing that will fit in the gas tank and shake it up down and side to side , and every way possible. Then wash it out with brick acid, and wash it out with gas diesel, or any other fuel, let the fuel fumes eviporate, then put gas tank sealer in it and shake it again.

Hope this helps in some way

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