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John Deere Tractors Discussion Forum
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Adjusting B Model Carb....

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Jeffro

01-02-2004 05:35:58




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I have put a rebuilt carb on my '50 model B and am having a tough time getting it to run right. I think the problem is with the Load adjustment. The book says to apply a belt load to the tractor and adjust, but I have no belt-driven apparatus. Anyone got suggestions for alternate solutions?
Thanks-
-Jeffro




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Clooney (carb adj)

01-02-2004 07:59:09




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 Re: Adjusting B Model Carb.... in reply to Jeffro, 01-02-2004 05:35:58  
Jeffro, it's really hard to get a good load needle adjustment just sitting still. The problem is even at wide open throttle the carb throttle plate is only partially open so it is still running on some of the idle mixture...

~Probably the place to start is set the load needle to 1 turn open from seated & see how it runs.. That might be slightly rich but most run pretty good there...

~With the tractor hot & sitting there idling you should be able to briskly push the hand throttle lever to wide open & the engine should accelerate smoothly without any popping or surging. Some black smoke out the muffler when briskly accelerating is normal but should go away as it runs for a few seconds more..

~A good place for a load test is to climb a long steep hill in high gear & see how it pulls..

~If you have a large trailer to haul your tractor you can put a load on that [like another tractor] & apply the electric brakes as you pull it..

~Or just pull your truck with someone lightly riding the brakes in the truck [preferably NOT your wife unless you want to cook your own supper tonight]..

~You might start at one turn open from seated then try 1/4 turn more closed & 1/4 turn more opened & see how it runs.. Then try 1/2 turn in both directions & see how it runs..

~You said...."am having a tough time getting it to run right"..>>> If you explain that in more detail we can probably help you on that issue.. Tell us where, when , & how, it doesn't run good & I'm sure we can help you with it.

~Maybe your problem isn't all carb related...

~Before posting back or E-Mailing, try running it with the choke partially back on & see if that makes it run better,, if it does you could have other issues..

JDClooney@aol.com

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John T

01-02-2004 07:19:33




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 Re: Adjusting B Model Carb.... in reply to Jeffro, 01-02-2004 05:35:58  
Jeffro, Yes using a load yields the best true carb load adjustment, regardless if you have an implement you can attach to the belt (like a Baker Fan) or PTO (like a grinder/mixer) etc. If you have no load to attach, heres how to get it in the ballpark that works for me.

Start with it (load needle) set at around 3/4 to 1 turn out from closed,,,,, , set throttle at Wide Open Throttle,,,,, richen (open) the load needle until she starts to black smoke out the stack and cut out (from running too rich),,,,, , then lean (screw in) the load needle just to where she stops black smoking out the stack and runs smooth. That may be a tad lean, cuz under a load more fuel is required, so if she starves under a load open (richen) her out a tad. On the idle needle, I set it initially at 1 3/4 to 2 out, then set throttle at idle, then lean (screw in) the idle needle till she starts to die,,,,, then richen (open) her back out about 1/4 turn till she idles smooth but not too much black smoke out the stack.

If they are set right, if you suddenly crack the throttle from idle to wide open, she will take her gas, not cut out or hesitate, throw a puff or 2 of black smoke, and then be fine.

After settign the load needle if she starts to cut out and starve for fuel under a load or even drivign in a high gear up a hill, richen (open) the load needle about 1/4 turn or so until she has power and fuel then under a load and dont cut out.

Again, this is simply a method that works for me, although Im sure there are plenty other ways and opinions of skinning the same cat lol

What are the problems and symptoms of it not running right as you claim????? ?? Is the ignition good and a good hot spark????? Is the fuel clean and fresh and water free????? Is the choke set right and wprking as it should??? Is the air cleaner bowl clean and has no water?????

Post back your results and any more quesions or e mail jmn50@msn.com

Good Luck n God Bless ya Jeffro

John T

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