tractor engine trouble shooting

montidale · Mar 6, 2011

I'm working on a M-H 444 with a four cylinder gas engine 277 CID. Trying to get it ready to do some work this spring.The problem is when I open the throttle wide open the engine bogs out and sometimes back fires out the exhaust. It seems to be worse under a load. Did a compression test all cyl from 110-95 psi. Dwell and timing are right on and the tappets are set good. I'm running out of options. Next step is carb or governor? Does anybody have any ideas?

old · Mar 6, 2011

One that back fires a lot of times is a carb problem and it is set to lean. What happens if you choke it some?? If it helps then you know it is not getting enough fuel

rrlund · Mar 6, 2011

I'd about bet you Rich,that you could get another case of beer out of this one by taking the inline filter off and throwing it away.

old · Mar 6, 2011

LOL yep a lot of times that is the problem

rrlund · Mar 6, 2011

Could be too though that the points aren't opening far enough. I've seen'em act that way when that happens.

rustyfarmall · Mar 6, 2011

(quoted from post at 12:06:59 03/06/11) I'm working on a M-H 444 with a four cylinder gas engine 277 CID. Trying to get it ready to do some work this spring.The problem is when I open the throttle wide open the engine bogs out and sometimes back fires out the exhaust. It seems to be worse under a load. Did a compression test all cyl from 110-95 psi. Dwell and timing are right on and the tappets are set good. I'm running out of options. Next step is carb or governor? Does anybody have any ideas?

Bogging down and backfiring can both be caused by insufficient fuel flow or a weak ignition coil. (Can also be caused by insufficient fuel in the gas tank) :lol: :lol: :lol: Yes, I'm guilty of that one.

D7fever · Mar 6, 2011

had trouble like that once.....changed the spark plugs, ran like new

El Toro · Mar 6, 2011

If that carburetor has a main jet adjusting screw near the bottom of the carb you need to open that as that will enrich the fuel mixture.
A lot of garden tractors has this feature too. Hal

old · Mar 6, 2011

Ya or the distributor bushings are getting bad and you have one or 2 cylinder that fire as they should and 1 or 2 that have a weak spark or a simple sticking valve many things can cause the problem and only by checking each thing one by one can one find the cause

old · Mar 6, 2011

You mean Rusty one doesn't run well when it is out of fuel can not understand that LOL. My 841 ford will let me know it is low on fuel and most of the time if I listen I can get it back to the shop for more fuel but there have been times I didn't listen to what it was saying ans walked back for the gas

montidale · Mar 6, 2011

Well you guys gave me a lot of things to try. I'll try opening the main jet more. I can get a coil off the F-in-L's 44 and see if that makes a difference. I never tried pulling the choke out a little will have try that trick. One thing I noticed the plugs in the tractor are Champion D15Y. But the original owners manual calls for Champion 8 Commercial or Auto-lite T8.I'm assuming Champ. 8 cross over to D15Y. I'll have to look in to that.Also being the tractor has a positive ground I have the key lead to the neg side of the coil and the pos going to the dist. Thanks everyone for the input. Dale

Jerry/MT · Mar 6, 2011

Make sure that the advance mechanism is working correctly.You said the initial timing was corredt.
Was your compression test with the engine at operatng temperature and the throttle wide open and the air cleaner disconnected? If not you ought to repeat it.

Leroy · Mar 6, 2011

That champion is a cold plug and they will just not work with this modern gas. The D15Y is a slightly hotter plug but go up to a D19 or D21 plug to get something that will work. On the Deeres that called for the 8 we ran 21 all the time

BobHnwOh · Mar 7, 2011

Condenser.

D7fever · Mar 7, 2011

champion plugs.....that's your problem, get another brand

Dave Sherburne NY · Mar 7, 2011

Change the plugs to AC and change the condenser and
make sure the points are set right.

Cienna · Mar 7, 2011

You have lots of good advice, and lots of good pictures, Hal. Keep it up.

CLTX · Mar 7, 2011

I tried to wean an airplane once. Kind of embarassing!!!

old · Mar 7, 2011

Well if it is the right airplane you can maybe glide to where it is safe to put down but if the wrong one it might fall like a rock. Either way I guess you made it or you jumped out with a big thing on your back. I would spell it out but do not have a clue how to spell it LOL I know it starts with Par

tractor engine trouble shooting

montidale

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