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48 'A' Carb Question

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Mike P

05-03-2002 05:31:10

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My tractor runs strong and starts easily, but he carb makes lots of clattering noise and the throttle plate constantly flaps open shut when the runnig.

I appears that the throttle shaft is quite worn and has lots of play in it.

I've never seen how a carb on tractor like this should act. Is the throttle valve supposed to move a lot (outside of the worn shaft that is) when the tractor is running? It acts like theres back pressure in the carb thats hitting the throttle plate when the motor is running which causes the throttle plate to open/close.

The governor linkage is stable and doesn't appear to be causing this behavior.

I'm planning on rebuilding the carb, including a new throttle shaft, and am wondering if this behavior is normal; if it's cause by worn parts; or if if could be something else such as the timing?

My 48 'A'

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Clooney

05-03-2002 14:45:38

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Re: 48 'A' Carb Question in reply to Mike P, 05-03-2002 05:31:10

Mike, what you have is not normal but does happen.
~There are different reasons that the carb will act as you say & that depends on throttle position, idle screw to spring adjustment, wear on the throttle rod & hole in the throttle shaft lever, wear on the throttle shaft & bushings or leaking intake valve(s).
~What engine speed, throttle setting & carb throttle plate opening does the carb flutter happen at?

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Mike P

05-05-2002 07:05:13

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Re: Re: 48 'A' Carb Question in reply to Clooney, 05-03-2002 14:45:38

I can't imaging that this behavior is normal at all. I'm hoping it's just in need of a rebuild.

It displays this behavior at all engine speeds, throttle settings, choke settings.

I'm planning on taking the fuel system apart today. I'd like to get it reconditioned so that when I put the rear end back together (see a previous post where you gave me a bit of guidance on my Powr-Trol woes) I can put a refreshed carb back on.

Could this behavior in the carb be caused by a problem outside fo the fuel system? I'm thinking of possibly a leaking valve or bad timing.

My 48 'A'

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Clooney

05-05-2002 14:22:07

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Re: Re: Re: 48 'A' Carb Question in reply to Mike P, 05-05-2002 07:05:13

Mike, if the problem is evident at all engine speeds, especially above idle you could have a leaking valve, worn camshaft, mis-timed camshaft, misfiring ignition, or severely coked up exhaust valve. ~Before disassembly check the ignition timing, cam timing, (on L/H cylinder compression & with "L/H exhaust open" on the flywheel to case lined up [or with in 1"] the l/H exhaust valve should just start to open ["0" lash]), look at the valve operation to see if they are all opening about the same, run a compression check then remove the push rods so ALL valves stay closed then put about 80 lbs of air pressure in each cylinder to see where the air comes out [called a leak down test & will show leaky valves or rings].
~If possible try another mag/distributor including wires from a known good engine.

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