WD45 Zenith carb drips gas
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Category: Allis Chalmers
Forum Name: Farm Equipment
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URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=110366
Printed Date: 15 Sep 2025 at 11:06am
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Topic: WD45 Zenith carb drips gas
Posted By: woodman Steve
Subject: WD45 Zenith carb drips gas
Date Posted: 13 Aug 2015 at 3:28pm
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hi, I am having problems with the 45's carb. The tractor runs fine, but the carb drips a lot of gas. When it is not running, it comes out in a stream. Here is what I have done so far. I have two sets of needles and seats. I have tested both using compressed air. I can hold the needles into the seat and stop the flow of air. I have tried both sets in the carb. Both let the gas leak. I mounted the carbs without the bowl on the carb, and I can easily hold up the float and stop the flow of gas. I have shaken the float, there is no gas inside, and not leaking. the float does not appear damaged. I have adjusted the float so it hangs parrellel to the carb body. I.have set the float in gas and it floats fine. I tried adjusting the float so it does not fill the blow so full. Please help. I am not sure what to try next. thanks! Steve |
Replies:
Posted By: BennyLumpkin
Date Posted: 13 Aug 2015 at 8:31pm
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You'll more than likely have to pull the carb apart. More than likely it's one of two things...dirt in the needle valve not allowing it to close or the floats have a hole in them allowing gas into them and they'll no longer float...either way you'll need to tear it down. ------------- Central PA Allis Express 1934 WC254 1945 WF 1945 WC135755 1951 WD68085 1953 WD45-150217 1957 WD45D-230744D B110 |
Posted By: Dan73
Date Posted: 13 Aug 2015 at 9:00pm
| When I rebuilt the carb on my d17 I had trouble getting the float adjusted correctly. After checking the needle and seat and float where all correct I ended up flipping the top of the carb upside down. So the float was holding the needle into the seat. I then measured the distance from the body of the carb to the float. Knowing that the float would leak at this gap I decided to bend both sides of the float radically to a point I knew there wouldn't be enough fuel to run the tractor and re assembled the carb. I proved to myself that the carb would not leak if setup correctly. Next I slowly bent the floats back about 1/8 of an inch each time until I found a gap where it started to leak. Then I backed up 1/8 to stop the leaking. This method required taking the carb apart a few times but it resulted in a float setting where the carb didn't leak and the carb didn't run out of fuel. That was my solution. |
Posted By: woodman Steve
Date Posted: 13 Aug 2015 at 9:26pm
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I can try adjusting it as you described. I must have took the carb apart ten times today. A few more times is now easy. Thanks, Steve |
Posted By: jlogli
Date Posted: 14 Aug 2015 at 6:44am
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Is the needle rubber? If not get one. ------------- 1945 WC on full steel, WD wide front, WD45 power steering, 1966 D-17IVfactory 3 point.1967 D-17IV SC. 1973 rotobaler white top. orange top roto, model 90 combine,82S, four bottom plow.302 baler. |
Posted By: Steve in NJ
Date Posted: 14 Aug 2015 at 6:48am
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Make sure the round gasket that goes under the seat isn't sitting on a little tiny piece of the old seat gasket. That's just enough to let fuel in under the seat and not through it! Also, make sure the inlet threads and the inlet bore itself isn't full of rust n' debris where it would get into the needle valve and make the needle leak. The newer style needle valves with the Viton tip work great, but they catch that little debris all the time if the fuel delivery system and or carb bore isn't spotless. When I'm rebuilding carbs for our customer's, I run a bore brush up n' down inside the inlet. Even after I glassbead the carb. You'll be a bit surprised the crap that comes outta' that bore even after glassbeading it! Rust n' debris get hung at the back of the inlet bore along with the threads for the inlet elbow. The bore brush on a hand drill will clean that crap right out and also shine the bore and the threads all up. Then ya know its clean!... HTH 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: woodman Steve
Date Posted: 17 Aug 2015 at 8:38pm
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Success at last. I got a new needle and seat. This stopped the gas dripping. I got the WD running as good as it has ran in years. Thanks for the suggestions and advice. Steve |
Posted By: nick51ca
Date Posted: 28 Sep 2015 at 10:09am
| I got a new kit from Steve for a CA. It never ran so good and idles great now. The needle and seat started to leak though. Cleaned up the inlet as suggested here and so far it's been just fine. There was a bunch of junk in there that probably got loosened up from soaking. |
Posted By: Stan IL&TN
Date Posted: 28 Sep 2015 at 11:19am
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And if all else fails just turn off the gas when it's parked. ------------- 1957 WD45 dad's first AC 1968 one-seventy 1956 F40 Ferguson |
Posted By: Dan73
Date Posted: 28 Sep 2015 at 11:42am
That is good advice in general. Turning off the gas can help if you have gunk in the tank which keeps getting into the carb. |
Stan IL&TN wrote: