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Discussion Forum
Show Parts for Model:

FARMALL H CARB ADJUSTMENTS??

Author 
LOU

10-13-2000 18:14:55
24.93.48.34



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GOT MY H RUNNING PRETTY WELL, BUT HAVE NOT ATTEMPTED TO ADJUST THE CARB. THERE ARE 3 (I THINK) ADJUSTING SCREWS, ANYONE CARE TO GIVE SOME INPUT ON THEIR ADJUSTMENT? HAVEN'T SEEN INSTRUCTIONS ANYWHERE EXCEPT ON CARB REBUILD SHEET. THANKS




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T_Bone

10-14-2000 02:27:42
207.254.53.37



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 Re: FARMALL H CARB ADJUSTMENTS?? in reply to LOU, 10-13-2000 18:14:55  
Hi Lou, I've never worked on a H, but lookin at the parts book:

1: On the upper main body on the left side is the idle rpm adjustment. Adjust for proper rpm at idle.

2: On the lower left side body, is the idle inrichment screw. Turn for best idle, but if turn all the way in and it makes no difference then the idle circuit is still plugged. Reclean. A preset is 1 turn out from seat.

3: On the lower body bottom a screw running from right to left at a 45 degree angle is the high rpm fule mixture screw. Run engine at 1500rpm and set for best rpm without missing. A preset is usually 1-1/2 turns out from seat. A Rich setting is better. I usually turn to best lean run, then turn rich 1/4 turn. Lean is screw in, rich is out.

4: On the upper body rigth side next too the fuel inlet there is a idle passage plug. This should be screwed all the way in. But if idle circuit is running ruff, then remove and clean passage with Chemtron Berriman B-12.

5: Inside of lower bowel left side is a idle jet metering screw, so that should be cleaned upon rebuild.

6: On lower right side is a pin, ball,and spring used to set tension on the choke butterfly and used as a dent setup to hold the choke open.

Thats all I can see in the diagram and should be a complete adjustment. Let me know if you need more help!

T_Bone

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T_Bone...Adjustment Up Date!!

10-14-2000 15:32:44
207.254.53.45



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 Re: Re: FARMALL H CARB ADJUSTMENTS?? in reply to T_Bone, 10-14-2000 02:27:42  
Hi Lou, You may want to get a service manual for this carb for adjustment. After referring to my 340u manual there is a whole bunch of "accurate" adjustments that would take way to long to type. The ones I've given are basic adjustments and should work "ok".

On Item 3: They call for a preset of 6 turns on a slightly different carb? Wow! You'll know right away which way is too much or little. Watch the exhaust stack, if black then it's too much and if lean it'll start to die with no black exhaust.

Besure to note Andy's post on the correct air adjustment. Thanks Andy!

T_Bone

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Andy Martin

10-14-2000 13:29:48
38.31.75.47



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 Re: Re: FARMALL H CARB ADJUSTMENTS?? in reply to T_Bone, 10-14-2000 02:27:42  
Per T-Bone's good advice, item 2, the idle mixture screw is an air screw. It acts the reverse of a fuel mixture screw. Closing it cuts off the air and makes the mixture as rich as possible. Opening it adds more air and leans out the mixture.

As he said lots of carbs are plugged and you get little or no response, but if it is idling rich, turn the screw out instead of in to lean it.



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