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Engine Requires Rich Fuel Adjustment To Run

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cheg

01-14-2003 05:27:25

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I started my 35 D after replacing the head. I earlier cleaned and rebuilt the carb (also fuel nozzle). The engine has new rings, head was plained and valves ground. The manifold was also plained and a new gasket put on. New points and condenser in Mag (big blue spark).

I turned the idle and load to the suggested carb settings for starting. The only way the tractor will run is with the choke half closed. I turned the adjustment screws out and slowly opened the choke. After many adjusting screw turns out, the tractor began to run with the choke open. I have never had a tractor do this. Do you have any ideas why I have to pour the fuel to the engine to get it to run? The engine still does not sound right. Is there such a thing that the inside of the manifold may be cracked letting exhaust gas into the intake portion? Somebody had stripped the threads on the carburetor to manifold mounting bolt holes. They drilled out the threads and now the holes go into the exhaust. A helicoil was put in. With the 2 carb to manifold bolts in place, that may not be a factor. If the engine sounded better, I would not worry about it. The timing also looks correct. Any ideas would be appreciated. Thanks

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Clooney

01-14-2003 08:01:16

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Re: Engine Requires Rich Fuel Adjustment To Run in reply to cheg, 01-14-2003 05:27:25

Cheg, the usual cause of having to turn the idle screw out farther than normal is a plugged idle passage or transfer hole in the carb. Worn throttle shaft bushings or incorrectly installed bushings [not flush with the inside of the throttle bore if the bushing hole isn't step bored] could be another cause. Also, make sure the throttle plate isn't worn on the ends� [if possible try a different carb to eliminate that as the problem].
~If the carb is [not the problem], make sure the float is set correctly. If the float isn't too low, suspect a vacuum leak [use an unlit propane torch or carb cleaner] & go around the intake manifold & carb base to see if the engine picks up RPM's. If so, you have a leak..If you don't have an obvious vacuum leak or carb problem you might want to pull the carb & make a block-off plate & pressurize the exhaust or intake & look [or listen] for leaks between the intake & exhaust or other signs of leakage. ~Have you verified the valve to crankshaft timing is correct using the L/H exhaust open mark on the flywheel?

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cheg

01-14-2003 12:47:14

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Re: Re: Engine Requires Rich Fuel Adjustment To Run in reply to Clooney, 01-14-2003 08:01:16

I earlier checked the mark for the LH Impulse and it triggers when it hits the mark on the tractor. I have not used the LH Exhaust open mark. Is this procedure listed in the archives? I do not understand how to do or set this. How does this timing get off?

The spark plugs I am using are new Autolites. The plug wires are new solid core.

Thanks

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Clooney

01-14-2003 13:46:23

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Re: Re: Re: Engine Requires Rich Fuel Adjustment To Run in reply to cheg, 01-14-2003 12:47:14

Cheg, the "LH Exhaust Open mark" is used to check the cam timing against the crankshaft position. It usually can't move by itself but could have been assembled incorrectly at one time.
~ Before checking, make sure the flywheel is on correctly...With the L/H exhaust valve lash set to specs, rotate the flywheel in the forward direction until the L/H exhaust valve is just starting to open ["0" lash,,, or just as the push rod starts to get tight while spinning it], at that time the "L/H ex open" on the flywheel should be within about 1" of the case mark.....

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Gordon

01-14-2003 07:11:49

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Re: Engine Requires Rich Fuel Adjustment To Run in reply to cheg, 01-14-2003 05:27:25

Try Autolite plugs

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