wd-45 lost spark
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=170255
Printed Date: 14 Sep 2025 at 12:04pm
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Topic: wd-45 lost spark
Posted By: mdm1
Subject: wd-45 lost spark
Date Posted: 18 Apr 2020 at 5:29pm
The tractor started right up and ran fine. I decided to take it for a short ride. I was going up a slight incline and it quit like it had run out of gas. Fired right back up but did the same thing again. Checked the fuel level with the closest universal fuel gauge and it seemed like maybe going up hill it didn't get gas.(this has been a problem before) Put five gallons of gas in it and no start. Didn't seem like it wanted to fire. 6v system, turned over very good, 6.1v at the battery, 5.3v when cranking. 5.3volts at the - side of coil with the switch on or cranking. Cleaned points, rotor and distributor cap. Checked spark with a good tester-no spark. Checked - terminal and + terminal on coil with a mulimeter. 0.0 Secondary was 8.3. Is my coil shot? Happened like right now. Sorry about the length of this post. Should the primary test around 1.5+-?
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Everything is impossible until someone does it! WD45-trip loader 1947 c w/woods belly mower, 1939 B, #3 sickle mower 1944 B, 2 1948 G's. Misc other equipment that my wife calls JUNK!
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Replies:
Posted By: MACK
Date Posted: 18 Apr 2020 at 10:27pm
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I would guess coil or condenser. MACK
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Posted By: Boss Man
Date Posted: 19 Apr 2020 at 8:22am
Posted By: Sugarmaker
Date Posted: 19 Apr 2020 at 8:23am
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I have run them out of gas many times! I mean many times! One thing I forget to do is turn the fuel on sometimes too. Thats a easy fix.:) Check for fuel again at the carb. If it has a drain on the bottom, which it should have open that and check for fuel flow too. Man I think back of the thousands of hours My Dad and I spent on these with so little maintenance. Good luck getting it running again. Regards, Chris
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D17 1958 (NFE), WD45 1954 (NFE), WD 1952 (NFE), WD 1950 (WFE), Allis F-40 forklift, Allis CA, Allis D14, Ford Jubilee, Many IH Cub Cadets, 32 Ford Dump, 65 Comet.
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Posted By: mdm1
Date Posted: 19 Apr 2020 at 8:50am
Chris I did check the gas flow. My problem is my tactors are 2hrs away so I need to take the parts I hope I need. To hard to parts chase. I think I will get a coil and tuneup kit and take a drive. I have to add. One multimeter will go as low as 200 on the ohms and then on the primaries reads 1.5, 2000 reads 1. After that it reads 00. The other one only goes down to 2k and reads 00
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Everything is impossible until someone does it! WD45-trip loader 1947 c w/woods belly mower, 1939 B, #3 sickle mower 1944 B, 2 1948 G's. Misc other equipment that my wife calls JUNK!
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Posted By: Ted J
Date Posted: 20 Apr 2020 at 11:28am
The condenser I would think of second, especially if it is an old one made in the US. If it is China junk, yes it's probably bad.
But I'd think it's the coil first......
But then, thinking,,,,,,and yes, it does hurt,,,,, start checking the continuity of the various wires themselves for an open. Solid wires on these old girls have a tendency to snap and cause an open. Hope this helps....
Looks like we may not get our breakfast for quite some time now....what with our dictator governor.
Hey Thad, want a governor??
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"Allis-Express"
19?? WC / 1941 C / 1952 CA / 1956 WD45 / 1957 WD45 / 1958 D-17
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Posted By: mdm1
Date Posted: 20 Apr 2020 at 3:02pm
Update. I took a new coil and a tuneup kit. Bought the parts at a farm store. Sorry but only place I could get them on my time shedule. Got some good ideas from Lon(MN). Had juice at the - side of the coil. Checked the points for spark. Had spark. Still no spark at the plug wires. At Lon's suggestion I ran a jumper from the hot wire on the starter to the - on coil. Put in new points, condenser and rotor. Fired right up. Took off jumper and hooked the wire back up to coil. Started and ran. For some reason I thought I would check the volts at the battery when it was running. Pulled out the switch to see if it would increase. The tractor shut off like I had turned the key. Opened the switch box and nothing looked bad. (new 3way switch) Unhooked the -wire on coil and hooked up jumper. Fired right up. Going to rewire it, get a voltage regulator and a push pull switch for the lights.
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Everything is impossible until someone does it! WD45-trip loader 1947 c w/woods belly mower, 1939 B, #3 sickle mower 1944 B, 2 1948 G's. Misc other equipment that my wife calls JUNK!
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Posted By: mdm1
Date Posted: 30 Apr 2020 at 6:55pm
Update. I ordered a 6v voltage regulator from Steve(B&B). Installed the voltage regulator. Rewired the entire tractor except the lights. Will do those later as I don't use them anyway. Really cleaned up the junction box on the tractor. Everything worked as it should. Happy tractor. Thanks for all the suggestions!
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Everything is impossible until someone does it! WD45-trip loader 1947 c w/woods belly mower, 1939 B, #3 sickle mower 1944 B, 2 1948 G's. Misc other equipment that my wife calls JUNK!
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Posted By: Dave(inMA)
Date Posted: 30 Apr 2020 at 7:26pm
Hey - it's great to win one of these battles!! Good to hear.
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WC, CA, D14, WD45
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