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Allis Chalmers Discussion Forum
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My B sputters on high

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Shawn Auman

03-25-2008 18:54:09




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I think this is a gouvernor problem. 42 B sat for 6-7 years. I rebuilt the carb. I knew from before she was put away that the coil needed replace because it would run for 20 minutes and then lose spark. I know the mag, points, condenser and distributor are all lined up and time perfectly. After I put the carb back on with fresh gas and new fuel line she fired right up but only runs good at idle. When I push the throttle the rpm go up but she pops and back fires and runs bad. I am reasonably confident it is not a fuel problem as she never dies or stops. It also feels like moving the throttle a little forward makes the engine run up fast but that may be my imagination. I have newer style governor spring and the surge spring on. The governor is about the only thing I have not opened up been through. I am guessing it is not advancing the timing with the rpm. Also rotating the mag while she is running make no noticeable difference. Any insight would be very helpful.

Thanks

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luke baxter

03-28-2008 17:35:10




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 Re: My B sputters on high in reply to Shawn Auman, 03-25-2008 18:54:09  
I bought a '41 B that sat for a number of years and had a "sputtering" condition with it. It turned out to be a sticky lifter. The lifter on # 1 cylinder hung up causing the push rod to lean over out of place. Once I corrected this issue it ran much better. No more sputtering.



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DARDAN

03-27-2008 22:33:26




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 Re: My B sputters on high in reply to Shawn Auman, 03-25-2008 18:54:09  
Castrol 'super clean' cleaner concentrate at full strength will disolve old carb varnish in minutes. Actually works faster and easier than any other product I've tried over the years. Just soak and flush with hot water. $6-$8 a gallon. It's a biodegradable soap product with a high lye content and really cuts grease and carbon on stuff. I even use it to clean engine parts to avoid sending out to tank.

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Ted in NE-OH

03-26-2008 08:54:49




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 Re: My B sputters on high in reply to Shawn Auman, 03-25-2008 18:54:09  
Sounds like starving for gas. Take tank off and rinse out remove sediment bowl and clean inlet.



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Texas Denny

03-26-2008 07:23:22




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 Re: My B sputters on high in reply to Shawn Auman, 03-25-2008 18:54:09  
I know it might sound strange to you, but it sounds like carburetor to me as well. The main jet is tough to clean as usually the pipe going into the throttle body can't be removed (stuck or no tool to fit it). Even if it can't be taken out, it can be cleaned - but with great difficulty. I once had a tractor that sat a good long time before I got it. I took off the carb and cleaned the main jet three or four times before I got it running good. I never got it running excellent - it still stumbled a little on speed up. Since the engine needs less fuel at idle, the restrictions cause less trouble at idle. In addition, the idle circuit is more important at idle and the idle circuit controls the mixture.

When I've had electrical problems, they usually have been there at all rpm's. Your governor will not have an impact on this unless it is wildly surging.

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Shawn Auman

03-26-2008 20:40:36




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 Re: My B sputters on high in reply to Texas Denny, 03-26-2008 07:23:22  
Cleaning the carb worked. Runs much better. It is not perfect yet but hoping it works it self out but she is ready to work.



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Texas Denny

03-27-2008 07:13:58




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 Re: My B sputters on high in reply to Shawn Auman, 03-26-2008 20:40:36  
Great! When they get crudded up inside, it is very difficult to get them clean again. They do have some gas additives that are supposed to dissolve "gummy deposits". I've have had limited success with them - never used them on old tractors. But I have used them with fuel injected cars and they seemed to help. It might help get the last little bit out of your carb.



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garytomaszewski

03-27-2008 16:21:52




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 Re: My B sputters on high in reply to Texas Denny, 03-27-2008 07:13:58  
When I get this close I like to run some E-85 through, especially after having carb off and cleaned. One gallon can and hose so as not to loosen any rust from tank, choke closed part way(just a little black exhaust), usually finishes the internal cleaning.



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Dick L

03-26-2008 08:25:15




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 Denny This Might Help in reply to Texas Denny, 03-26-2008 07:23:22  
I think you are on the right track. As to removing the feed tube: I have a set of screwdriver type nut drivers. The end of the tube will insert up the center hollow shaft. I (always) take a burnzamatic torch and heat the cast area around the feed tube threads before I start to turn feed tube out. No heat on the feed tube itself. Before I started to use heat I twisted some off. If the power jet gives any resistance I heat the outside of the area to loosen the brass power jet also. I started this when I found out a shop the rebuilds carburetors bakes them in an oven and removes the inserts while still warm.

With the feed tube and power jet out I run small drill bits by hand in the holes to make sure all the sticky stuff and carbon is out.

This is after soaking them in a basket of NAPA carb cleaner. After inserts removed and the drill bits used I soak again and then flush with water and blow them dry.

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Texas Denny

03-26-2008 10:15:13




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 Re: Denny This Might Help in reply to Dick L, 03-26-2008 08:25:15  
Yes, I have one of those tools now. On that first carb, I did not. So it took a very long time to get that goo out of the pipe. I've never twisted a pipe off - just lucky, I guess. Drill bits work good for cleaning a stuck one. That goo even comes off the bits with some difficulty.



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slowsmoke

03-26-2008 04:01:37




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 Re: My B sputters on high in reply to Shawn Auman, 03-25-2008 18:54:09  
If it sat for that long, I might have a valve hanging. Try running a compression test. Only a guess!



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old

03-25-2008 21:16:41




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 Re: My B sputters on high in reply to Shawn Auman, 03-25-2008 18:54:09  
Back fire 99% of the time means the carb is running lean. Thats one of the problems with the B and C and not having an adjustable main jet on the carb. I would try to work on the carb more your main jet is still clogged up. BTDT and have the same problem from time to time on my C



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