606 head scratcher

[JAsher452x]

Last night i was out pulling posts to replace fence. i had the tractor running at about 1200 rpms so i could keep the hydraulics happy with out loading up to much. after about 10 mins i noticed a faint misfire. thought nothing of it and after 10 more mins it was a few more cylinders misife. i climbed back up on and cracked the throttle and it clear up all bout about on cylinder. i thought it might be a good time to get back to the shed. I started my drive through the paddock around to the gate and she started to fall on her face firing on about two cylinders. to keep from doing any more possible damage i shut her down. after about 10 seconds i cranked to see if i could hear if something mechanical may have failed, when i hit the starter it fired right up perfectly and purred no sign of the misfire. i did not want to press the issue and took it to the shed to retire for the night.

Any ideas where to start to look at? I do know that i need to get a tune up done, was just waiting to get my little jobs done before i pull the loader off to get in there. points looked good a few weeks ago when i checked. I have not pulled the plugs to check them, kind of a bearcat to get to with the loader on the machine. could it be condensor or coil? its not a fuel issue, i could smell the unburnt fuel in the exhaust when it was misfiring.

 

[sd pete]

It might have a fuel flow problem. It could be plugged at the tank outlet the sediment bowl or at the carburetor. I am not familiar with the 606. If it has a drain plug on the carb unscrew it and see if it will run out a pencil size stream for 30 sec to a minute.

 

[notjustair]

Lately I have had a headache with spark plugs in an old gas tractor. I used to think either they
worked or didn't. These had been funny and had to be replaced eventually when I got sick of
messing with it. Don't discount t those plugs. And don't run champions.

 

[Andy Martin]

I'd start with the condenser and swap out the coil if that doesn't fix it.

 

[old]

Could be either ignition or fuel. Carb could have gotten a piece of dirt in the float needle area and that will cause flooding which would cause that. I would check the spark and make sure it is a nice blue/white and that it jumps a 1/4 inch gap at all plug wires. Then pull the carb drain plug and let the gas flow for a few minutes and catch the gas to look for water/dirt/rust

 

[RBoots]

X2 on the champions, I like the way you think lol. And I would replace the condenser, they can do funny things to your spark when they fail. New ones seem to be junk. After doing numerous tune ups on the tractors on our farm, I have seen more condenser failures than I used to after replacing them.

Ross

 

[JAsher452x]

well tonight after getting home and getting chores done. i went out to tinker and check things. i started with fuel just to rule that out. filled a gallon glass jug pretty quick out of the carb drain. crystal clear nothing in the fuel. then for grins i attempted to start it.. no fire, fuel dripping out of the weep hole on the carb after 10 seconds of cranking.
I knew it was flooded after that lol. i went over and pulled the coil feed off the cap and hooked it up to a gapped plug that i keep mounted to the loader frame. cranked the engine over and had a good blue white flash pulse. that tells me that the condenser and points are working. Took the cap off and found the cap had ALOT of carbon tracking on the contact leads. rotor was not to bad. That is where i stopped for the night because for the life of me i could not locate my 12 point thin walled 7/8 socket to check the plugs

 

[old]

Not something you want to do often but with the ignition on grab the distributor cab and spin it over. If you jump 10 feet and want to say a few words that you can not post here you have a crack distributor cap and it has absorbed water so that is where you spark has gone. Just ask me how I learned that one

 

[JAsher452x]

Old, i will take your word on that. had that happen on an old HEI not a good day for sure. it was kinda hard to see if the carbon was building up much on the plastic due to it being a black cap and holding my head in an goofy postion to get a look up in side the cap.

Is there a vent on these IH distributors to let moisture out? it seems the only time i really have any troubles with the tractor is when it is humid or humid condtions.

hopefully tonight if the rain holds off and i can get it fired up i can get the loader off and start on a tune up

 

[old]

Many times a crack distributor cap will hold moisture and that in turn short it out. When if is humid and wet it is even worse. I learned that back when I was younger and my dad had a GMC pick up that would not run well when it was humid out and I found a cracked distributor cap the hard way. Yep I put my hand on it when some one was trying to start it. But at least I found the problem

 

[Roger l hall]

next time it starts starving for fuel loosen the fuel cap it might not be vented or plugged roger