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Sputtering Part 5 (My tractor is possessed)

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Rob in VA

02-02-2004 05:40:52

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Ok,

Either my tractor is possessed by one of the old horse farmers that likes to play games or I need some more advise.

This weekend I changed out the exhaust/intake manifold and muffler (at Dell's recommendation) thinking there might be a crack between the exhaust and intake chambers, but that was not the case and I still have a sputtering/backfire problem, seems worse now the a few weeks ago. The problem is now happening as soon as I start the tractor. Here is the kicker, she will run terribly for 15 or so minutes and then all of a sudden, woola, she is running like a champ, no sputtering or backfire and plenty of power. She will run like this for 10-15 minutes and as quickly as it came on, it is over and she is running terribly again. So yesterday, I checked the plugs which are only 2 monthes old and they were dark black with a lot of soot on them. In fact one of them wouldn't even arc. So I ran up to the parts store and bought and gapped four new plugs thinking my problem was solved, but not... she still sputters and backfire something aweful. I also checked the distributer, looked fine. Looked at and reset the points, they all looked good. Bypassed the resistor, and rewired the coil, all of this did not fix the problem. Again, the following has been replaced in the last couple of monthes.

Coil
Ignition
Spark plug wires
spark plugs
distributer cap
points
rotor
condensor
manifold
resistor
voltage regulator (cut out)
carburator
new gas w/dry gas additive

Please help, I am going crazy trying to figure out this problem. Why would the tractor run fine all of a sudden and then go back to sputtering after 15-20inutes of good running.
thanks
rob

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raytasch

02-02-2004 15:51:54

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Re: Sputtering Part 5 (My tractor is possessed) in reply to Rob in VA, 02-02-2004 05:40:52

Rob, Nowhere did I see that you pulled and cleaned the mesh from the air cleaner, clean the cup, or tell how much and what weight oil you are using in the air cleaner cup. Does the problem exist with the air cleaner tube disconnected? Maybe that mouse that built a nest in to top part of the air cleaner moves her brood every 15 minutes. BTW, I think Gaspump meant to say the vacuume port is above the intake flange. My swag is something is changing the mixture.
ray

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Rob in VA

02-02-2004 16:34:28

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Re: Re: Sputtering Part 5 (My tractor is possessed in reply to raytasch, 02-02-2004 15:51:54

Unfortunatley, I did clean out the air filter and all its components. Can't remember what weight oil I used, but I followed the manuel. I have tried taking off the tube, but no noticable difference. I will keep pluging away, the up side of this, I am learning a lot about the N tractors.

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EDDIE8N

02-02-2004 15:34:17

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Re: Sputtering Part 5 (My tractor is possessed) in reply to Rob in VA, 02-02-2004 05:40:52

Rob,
Try taking your air intake hose from the air cleaner off the carb and see if it will run that way.
I know this sounds way out on a limb, but the problem might be in the oil bath air cleaner, i.e. chunk of ice choking of the air to the carb.
Far fetched, but worth a try.
Good Luck,
EDDIE8N

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Rob in Virginia

02-02-2004 14:29:58

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Re: Sputtering Part 5 (My tractor is possessed) in reply to Rob in VA, 02-02-2004 05:40:52

Thanks for all the advise, I will pull the brand new Zenith carb I just put on there and give a good cleaning and adjust the float because it still overflows if the gas is not turned on. I will keep you all posted.

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Dell (WA)

02-02-2004 09:15:15

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Re: Sputtering Part 5 (My tractor is possessed) in reply to Rob in VA, 02-02-2004 05:40:52

Rob..... ..you write..... "So yesterday, I checked the plugs which are only 2 monthes old and they were dark black with a lot of soot on them"..... . Wanna guess why they're black and sooty? OR do I haffta tell ya yer carb needs adjustment. (grin) Remember, all we can do is offer advice based upon what you report.

Ford tells ya, to turn all adjustments screws to 1-turn. Well yeah, that should get you in the ballpark to gitter started.

After you gittitt started and semi-warmed up, I adjust the down-pointing mainjet screw to 1 1/2 turns and LEAVITT.

Then adjust the side-pointing idle mixture screw to MAXIMUM rpms, not smoothest idle, MAX ok? On a good carb, it usually about 1/4 turn. Remember, N-Carbs are bassawkwards, out for lean, in for enrich.

Adjust the behind carb idle set screw for a SLOOOooow 400 rpms.

You need to alternate between the idle mixture and idle rpms adjust. Anything that seems so slow but doesn't die is probably close enuff. I check by goosin' the throttle, if'n it don't die, its close enuff..... ..Dell

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E. Ray

02-02-2004 08:05:04

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Re: Sputtering Part 5 (My tractor is possessed) in reply to Rob in VA, 02-02-2004 05:40:52

Rob..... ..... .Checked back through the archives to see if you are front of side mounted. Couldn�t find so I will throw this out. Have a NAA that was having symptoms similar to yours and I thought it was fuel. I checked and rechecked fuel system several times. The last time I reset the float, was stand there shaking my a&& and scratching my head listening to it sputter. I reached down and twisted the distribute and lo and behold, the cap was loose on the distribute. The clips were on but, could twist the cap a few degrees. Either the gap on the dist. is too big or the tooth on the cap is too small.(or the other way around) I moved cap counter clockwise as far as it would go, put a wire around it and wired it back to the batt. box. Plan to find which and fix it right as soon as I get time.(that was last spring)..... .....E. Ray

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ONTRICK

02-02-2004 07:35:36

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Re: Sputtering Part 5 (My tractor is possessed) in reply to Rob in VA, 02-02-2004 05:40:52

Had same problem did excactly what you did step by step turned out to be the seal at the throttle plate shaft on the carb goodluck ONTRICK

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bj/8n/mt

02-02-2004 07:20:03

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Re: Sputtering Part 5 (My tractor is possessed) in reply to Rob in VA, 02-02-2004 05:40:52

Since you [and me too] are grasping at straws try this one. You mention changing the cutout so I am assuming this is a front mount distributor. If so there is a copper strip that connects the points that has been known to break and cause intermittent ignition. There is also a fiber washer that can be compressed too tight and cause intermittent ignition. Check both really, really carefully off the tractor and on the bench and see if there isn't a break in the strip or washer.

Your mileage may vary

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bobeque

02-02-2004 07:08:16

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Re: Sputtering Part 5 (My tractor is possessed) in reply to Rob in VA, 02-02-2004 05:40:52

When you clean out your carb, go beyond the usual soaking and air blowing and take the main nozzle out with a 3/8 deepwell socket and clean small holes with wire from a wire brush. Clean all jet orfices same way and use lots of compressed air. Be sure float level is set properly (1/4 " clearance) and check filter screens between carb and gas tank. blow them out with air good. It sounds like your problem is in the fuel system.

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Bob

02-02-2004 06:58:22

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Re: Sputtering Part 5 (My tractor is possessed) in reply to Rob in VA, 02-02-2004 05:40:52

I can't recall from a previous round if you stated what distributor you have, but have you checked the advance mechanism for unusual wear or sloppiness, and that the spark advances properly with speed? Have you checked for shaft/bushing wear?

Have you checked your valve clearances, and lifted each valve with a screwdriver to check for free movement, and the same "feel" to all the valves, giving a rough idea of similar spring tension on all the valves?

If all else fails, there is a slight possibility of a small head gasket leak between two cylinders. This can cause weird problems.

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Gaspump

02-02-2004 06:53:29

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Re: Sputtering Part 5 (My tractor is possessed) in reply to Rob in VA, 02-02-2004 05:40:52

Man you threw everything in the book at that poor old tractor. Slow down and take it step by step! The problem you describe now sounds very much like an ignition problem that is in the carb! (Sometimes they are). It sounds like sticking or non seating float and needle valve which causes over flooding with fuel. It will sometimes clear up as fuel flows for a time. As to the manifold a simple vacuum test would have shown a bad one, the small plug above the exhaust flange is for the test. Best thing now is go over each and every step in the whole process and correctly diagnose the problem, you can find the problem(s) or may wish to have a pro mechanic help.

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Upper Peninsula, Mich

02-02-2004 06:48:36

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Re: Sputtering Part 5 (My tractor is possessed) in reply to Rob in VA, 02-02-2004 05:40:52

Rob. You must have the ghosts of Henry Ford and Harry Furgeson living inside and still fighting their handshake agreement. Suggest you consider all of todays posts and then add an international prayer vigil to rid the beast of it's problems. You might also consider selling it back to whom ever you bought it from and raise the price to cover all the new parts and labor you have in it.Unless you still consider that person a friend? Seriously, the black plugs points to what you have been saying all along, "its a gas problem." Too rich a mixture produces the black gumed up plugs you have been describing. Is it also spitting out black smoke when it starts sputtering? Sounds like it may be choking itself off at times, doesn't it? Which one of you forum members placed this Cruel HEX on Robs tractor?

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RB(VA)

02-02-2004 06:32:15

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Re: Sputtering Part 5 (My tractor is possessed) in reply to Rob in VA, 02-02-2004 05:40:52

Ron,
Sounds to me that you've got a bit of trash in the carb. somewhere and it is being pulled into the main jet and then being blown back whenever there is a lean mix backfire.
Take it apart and clean it in carb solvent form your local parts store and blow it out good with an air hose.
Good luck.

Roy

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souNdguy

02-02-2004 05:56:50

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Re: Sputtering Part 5 (My tractor is possessed) in reply to Rob in VA, 02-02-2004 05:40:52

You trying to mow a indial burial ground?

Soundguy

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Fred

02-02-2004 05:50:43

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Re: Sputtering Part 5 (My tractor is possessed) in reply to Rob in VA, 02-02-2004 05:40:52

Try a Catholic priest and go after that old horse farmer.

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