carburetor ???
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=131892
Printed Date: 02 Jun 2025 at 10:47pm
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Topic: carburetor ???
Posted By: jkoepke
Subject: carburetor ???
Date Posted: 27 Nov 2016 at 7:00pm
| Hi Guys brand new on here not sure if im posting in right spot or not im sure somebody will let me know. I have a 1950ish wd45 tractor that has a couple issues im trying to work out. The motor starts right up and will idle for 10 minutes or so then it will backfire a little and die. When i try to restart it some times it will fire right back up but most of the time it acts flooded and wont start. I took carb off and cleaned all ports and checked float level all seems to be good. It has a tsx773 carb. I also changed plugs points condensor rotor and cap, wires trying to resolve issue with no luck. Is it possible it coould be idle jet set to lean or to rich? When im running the tractor with a loadon motor it runs fine. |
Replies:
Posted By: WF owner
Date Posted: 27 Nov 2016 at 7:29pm
| Have you checked to see if you have consistent spark after it stalls? It sounds like it could be a bad coil to me. |
Posted By: jkoepke
Date Posted: 27 Nov 2016 at 7:40pm
| Now that you mention that i did pull coil wire and turned it over to check for spark. I could not see spark at that time but it sunny out and hard to see. I let it set a little while and it started right back up. Today it done the same thing and died try to restart and it acted flooded again i checked spark at coil right away and there was good spark, good fuel, but is acts flooded and wont start. If i hold throttle wide open and try to start it pops a couple times but wont start. I will have to let it set a while before it will start again. |
Posted By: Gerald J.
Date Posted: 27 Nov 2016 at 7:57pm
|
Coils do fail from heat sometimes in 15 minutes or so and after cooling recover. Condensers have been known to do that but more often don't recover in my experience. Check for these conditions by checking for spark from the coil hot wire right after it quits. A gas tank cap that doesn't vent will let it run for a while 10 to 20 minutes before the vacuum built up in the tank keeps fuel from flowing. Check for a sucking sound when you open the gas tank cap right after it stops. That vacuum will starve the engine, but should do it sooner when running under a load at working speeds instead of idle speed. Idle mix set wrong won't help it run a long time. Its bet set with the governor held off and tuned for maximum idle speed with the throttle plate held closed. If you let the governor work it will hide the speed changes you need to hear to get the best idle mixture. Too rich can flood it so it dies. Gerald J. |
Posted By: DrAllis
Date Posted: 27 Nov 2016 at 8:12pm
| Next time at the 9 minute mark, shut off the gas at the sediment bowl for one minute and reopen it. See how it reacts. While you had the carb apart, a new needle and seat and bowl gasket would have been in order at a minimum. |
Posted By: jkoepke
Date Posted: 27 Nov 2016 at 8:13pm
| when it does die i loosen the gas cap and it does have a lot of sucking sound. When i try to restart it with cap off it wont start |
Posted By: jkoepke
Date Posted: 27 Nov 2016 at 8:21pm
| While carb was apart i did replace needle and seat and gasket. Is there a difference between 6 and 12 volt condenser? |
Posted By: Sugarmaker
Date Posted: 27 Nov 2016 at 8:24pm
|
Welcome! The 45's are the best! I just don't own one.:( I don't think you should have a sucking sound when you take the cap off the gas tank. Check to see if that cap is venting properly as mentioned. I have had the carbs off several times before I was happy. Good suggestions so far on electrical. We need a picture or two of said tractor! Regards, Chris ------------- 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. |
Posted By: jkoepke
Date Posted: 27 Nov 2016 at 8:35pm
|
Im thinking about picking up a new coil, However my tractor is 80 miles away so not sure what is on it. It is a 12 volt system. Is there a over the counter 12 volt coil that i should use? Thanks for all the help |
Posted By: Gerald J.
Date Posted: 27 Nov 2016 at 9:32pm
|
There is a difference in the coil for 6 and 12 volts, running a 6 volt coil on 12 volts will be hard on the coil causing it to overheat and short turns. Your coil is probably fried, so a universal 12 volt coil is the handiest replacement though another 6 volt coil and a suitable resistor with resistance the same as the coil primary will work, but will be harder to find. There probably is a difference in the condenser also. If you have a sucking sound at the gas cap your gas cap isn't venting and it should be a venting cap. I know NAPA has venting caps for farm tractors, I bought one last year. We think of tractors having only one problem at a time, but 12 volts on a 6 volt coil and the gas cap not venting could be two problems at a time. Gerald J. |
Posted By: Allen Dilg
Date Posted: 27 Nov 2016 at 9:50pm
| Hello jkoepke Try removing the intake hose from carb and run it?? When it dies open the drain under the carb, should run full stream for 15 seconds. What ever you find PLEASE REPOST!! Allen You refer to sucking sound explain, runs rich black smoke?? |
Posted By: jkoepke
Date Posted: 27 Nov 2016 at 10:07pm
| Ok I looked at some old posts looks like NAPA IC14SB woud be a good replacement for the coil and i will be getting a new fuel cap as well. When i was testing coil for spark it was jumping about 1/8 to 3/16 inch and looked shinny silver bright not a good blue color. I will repost once i replace these may be a week or more before i get back to tractor. Thanks for all the help, need to get it going snow is here. |
Posted By: Steve in NJ
Date Posted: 27 Nov 2016 at 10:20pm
|
If that Tractor has been changed over to 12V's, you want a 3.0 Ohm coil to work with the 4 cylinder on 12Vs. Don't purchase a Universal 12V coil. They're only 1.8 Ohms which is fine for a 6 cylinder or V8. With the 4 cylinder, you need 2.7-3.3 Ohms of resistance. A three ohm coil puts you right smack in the middle. That coil DOES NOT use a ballast resistor. BTW, welcome aboard the best damn Allis site goin'!! Steve@B&B ------------- 39'RC, 43'WC, 48'B, 49'G, 50'WF, 65 Big 10, 67'B-110, 75'716H, 2-620's, & a Motorhead wife |
Posted By: jkoepke
Date Posted: 27 Nov 2016 at 10:21pm
| Allen, It does not smoke at all. The gas cap is a self venting gas cap but maybe it is working properly. After it dies when i loosen the gas cap i can here it sucking air into gas tank. It is actually hard to turn gas cap until sucking sound is gone so i think gas line is air locked. I just dont know why it acts flooded unless coil is bad and not producing enough spark to fire. I think i have multiple issues that are all related |
Posted By: Orange Tractors
Date Posted: 28 Nov 2016 at 2:05am
|
Change the gas cap first and see if that fixes your problem. You could even run it without a the cap on if you don't want to buy one to test it. There are both vented and in vented ones, make sure you get the vented one. Robert
|
Posted By: WF owner
Date Posted: 28 Nov 2016 at 5:19am
...and sometimes dirt (and insects) can plug up a vented cap! |
Orange Tractors wrote:Posted By: jkoepke
Date Posted: 03 Dec 2016 at 4:54pm
| I just went and worked on wd 45 today. Changed the coil and gas cap and it fired right up and ran perfect. It set and idled for half hour and ran good plowing snow. Thanks for all the help. Not sure if it was gas cap or coil or maybe both. |