(another) B Starting problems
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=204213
Printed Date: 19 Nov 2024 at 11:41am
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com
Topic: (another) B Starting problems
Posted By: stockcalc
Subject: (another) B Starting problems
Date Posted: 18 Nov 2024 at 3:09pm
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uploads/25308/AllisChalmersB.jpg" rel="nofollow - uploads/25308/AllisChalmersB.jpg
Hello all - First time posting (new account also) - have followed a lot of great discussion/advice/troubleshooting here over the last few years. Thank You
I inherited a 1948 B Allis Chalmers (6V, magneto, father in law had it -ve ground - I know they are +ve ground, have not switched it yet) - tractor usually started well with a quick choke, would hear it pop, shut choke off and it would fire up. It would have issues restating though if I ran it a while, shut it down. Would need to wait 15-30 minutes, re-choke it and it would fire, shut off choke and it would start. Tractor is on a woodlot in Canada and stays out of the weather when not in use.
In September it was running as described above then I shut it down but have not been able to get it started again. Tried the above and no luck. I was able to get it back in the shed (towing, winching) and have pulled the carb and sediment bowl, cleaned them thoroughly (carb kit), new plugs with spark. I have not opened the magneto yet. I have a video so you can hear it but i don't think I can attach it here? I attached a picture for reference but you all have seen a thousand of these... It sounds like it should fire up, just something has changed. When choke is off it does not sound like it will start. I tried some quick start ether spray as well and it chugs (sounds like it will start) but does not start. Have not tried a bump start yet - not sure if that would do it.
Any help appreciated - I'm guessing it flooding but I can't seem to find a combo that it will start. I'm also wondering if it could be a grounding/short issue? I opened the ignition box to examine it and did not see anything. I did update the wire connector to the magneto (shut off) also as the wires were fraying. This is a hobby tractor so I take all of this as part of the education, which I am enjoying. |
Replies:
Posted By: steve(ill)
Date Posted: 18 Nov 2024 at 8:03pm
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well, if you got spark, that leads to believe it is fuel related... Since it does fire on ether ( but does not run) , that also leads one to believe it is fuel related... Could be one jet is plugged so it does not suck up gas and hard starting.. Heavy chocking is another sign that the carburetor has a plugge jet.
I know you have cleaned it, but it may need the jets removed, cleaned, blow out with air, rod thru the holes with a torch tip cleaner.. etc... Everything you said lead to believe it still has a carburetor problem.
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Like them all, but love the "B"s.
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Posted By: Gary
Date Posted: 18 Nov 2024 at 8:24pm
If it were mine, first thing I would do is make sure that the "fresh" gas in the Fuel Tank is getting all the way through the elbow at the Carb.
Different spots along the way that gas could be blocked.
Next after that check would be the Air Flow through the Breather.
G
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Posted By: Eric B
Date Posted: 18 Nov 2024 at 9:44pm
This may not be your issue but I'll share it as a possibility. One year when I had my '48 B up at our bush property from spring to fall, I was using it off and on as needed but the same tank of gas essentially. It started OK when I put it on the trailer for home at the onset of fall. At home I went to start it later when the temperature was just under +4 C (39 F) and it refused to even give a single 'puff'. To my surprise it had spark (battery ignition). I drained the tank and the carb, put in fresh gas and it started immediately. I was most amazed. The tractor having been in the sun all summer made the gas evaporate away essential aspects needed for a lower compression engine to start. This was confirmed as I consulted the expertise from guys that are into car racing. Since then, when I can't park my tractors away from the sun I generally cover the tank with a piece of plywood to keep the tank cooler. When I suspect questionable gas in tractors when fall comes and I know I will need trouble free starting in the real cold of winter, I drain the gas, put it in a can marked 'summer gas'. It's still OK for use the following summer.
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Currently- WD,WC,3WF's,2 D14's B. Previously- I 600,TL745,200,FL9,FR12,H3,816 LBH. Earth has no sorrow that Heaven cannot heal!
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Posted By: steve(ill)
Date Posted: 18 Nov 2024 at 10:24pm
Gary idea of checking the air flow is a good idea... I had a wasp build a mud nest INSIDE The air cleaner top cap and restrict air flow to the air cleaner... Always ran like i had the CHOKE on.....
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Like them all, but love the "B"s.
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Posted By: stockcalc
Date Posted: 19 Nov 2024 at 6:15am
Thank you all - great forum. Very helpful I agree it sounds like fuel - am wondering about the float and needle value also I have drained the fuel a few times (when taking off sediment bowl) and am using fresh fuel (purchased this summer, stored in a cool shed)
I will take the carb off again - I did take the jets out, cleaned but will try that again Ill check air flow through the breather as well - good suggestion Tractor is at the woodlot so I will be up again on the weekend, get carb, clean during the week and return following weekend to reinstall. Once the heavy snow hits I can't drive down the hill - need to snowshoe in then (am in Eastern Canada)
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Posted By: Les Kerf
Date Posted: 19 Nov 2024 at 8:50am
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Random issues I have encountered causing poor/non starting with my Allis Model C:
Magneto impulse not 'clicking', causing the effective timing to be early; it can still give a spark but at the wrong time. If you have the ability to hand-crank, check for spark and listen for the tell-tale clicking of the magneto.
Champion spark plugs. 'Nuff said.
Restricted air flow through the oil bath air cleaner. While parked outside, rain water leaked into the oil cup, the emulsified solution then froze into the consistency of ice cream.
Water in the fuel.
Cranking too fast by using 12 volts on a 6 volt starter.
My Model C refuses to start when the throttle is too far open. With the throttle lever set in the second notch it fires up almost instantly.
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Posted By: Steve in NJ
Date Posted: 19 Nov 2024 at 10:36am
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Disconnect your Mag kill switch and see if it starts. Could be the switch itself going to ground on occasions. If you disconnect the switch and it fires right up, there's your culprit. Happens quite often. Check fuel flow from the tank to the Carburetor. Disconnect the line at the Carb, open the petcock on the sediment bulb and catch the fuel in a clean jar or container. Let it flow for a few minutes and see if it slows down or stops, and then all of a sudden it starts again. If so, it's a fuel delivery problem and not neccessarily the Carburetor itself.
As for the Mag, when was the last time it was tuned up? The points may be getting oxidation on them due to a failing gasket or just age. Condenser will play havoc like that as well. If the Mag has the old style tar taped Coil in it, it could be leaking and grounding out on the inside of the Mag housing. Replace the old tar taped Coil with the newer Epoxy Coil whether the Coil is bad or not. Those old tar taped Coils were the pits!
Steve@B&B
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39'RC, 43'WC, 48'B, 49'G, 50'WF, 65 Big 10, 67'B-110, 75'716H, 2-620's, & a Motorhead wife
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