Tractor problem

Ji Case 35172 · Dec 26, 2017

I have a Case Sc that runs really bad. It used to always run like a top then all of the sudden it started to change now it runs like crap. I thought it was the intake manifold gasket so I replaced that and the exhaust manifold gasket it sounded better but it still runs bad. I have cleaned the carburetor 4 times and I try to adjust it to make it run better and no matter how much I turn the idle mixture screw or things like that it doesn?t seem to make that much of a difference. Do I need a carburetor rebuilt kit or did it jump timing? What do you guys think.

Olliejunkie · Dec 26, 2017

How's the points and condenser?

DeltaRed · Dec 26, 2017

Have you checked the ignition system?Condencers have a way of failing,points get burned,plug wires go bad(especially carbon silicone)/fall off......

Gary Mitchell · Dec 26, 2017

And the rest of the electrical system i.e. cap, bug, and wires, plus wiring. gm

Russ from MN · Dec 26, 2017

Cracked distributor cap? Spray the inside with WD 40 and then wipe out the excess, the water displacer will force the moisture out of the cracks and temporarily solve your problem. Something cheap to try!

oldproudvet · Dec 26, 2017

Bad or weak ignition will mimic fuel problems everytime. Although, with my SC, I had the intake/exhaust manifold rot thru and leak ex and excess air into the intake, definitly won't run well that way. That's the way mine was, running fine, a week later garbage. Changed from mag to dis, carb apart a dozen times until one of the guys on the Case forum next door mentioned that the manifolds are prone to crack/break/rot thru, or whatever.

rrlund · Dec 26, 2017

Just a caution as you get in to a tune up on it. If you change the plug wires,use steel or copper core wires,not carbon core.

mschwartz · Dec 26, 2017

Hello I would also suggest that it may be the manifold as I went through the same scenario last year with a SC. Mine went from running great to running poorly to finally only running for less than a minute or until the manifold warmed up and opened the crack. Good luck, Mike

old · Dec 26, 2017

If I have said it once I have said it 100 times trouble shoot then parts NEVER the other way around
#1 check that you have a good blue white spark at the center wire of the distributor cap and at all the plug wires. It needs to jump a 1/4 inch gap or more.
#2 pull the carb drain plug and make sure you have a good steady flow of gas that will fil la pint jar in less then 3 minutes.
#3 when was the last time you serviced the air cleaner and dumped the water and mud out and fill it with oil
#4 check the compression you may have valves that need to be adjusted. Over the years of running they do need to be adjusted once in a while

Steve@Advance · Dec 26, 2017

If that engine has a history of manifold problems, a vacuum gauge will be helpful in diagnosing.

Here is a video with instructions for using one. I realize this is on a high tech engine, but the same principles still apply. He is basically reading the instructions that come with a vacuum gauge.
Using a Vacuum Gauge

Andy Martin · Dec 26, 2017

(quoted from post at 08:37:42 12/26/17) Just a caution as you get in to a tune up on it. If you change the plug wires,use steel or copper core wires,not carbon core.

I never put carbon filament wires on my old tractors, the carbon filament wires on them seem to last forever.

Ji Case 35172 · Dec 26, 2017

I have already done all that at least twice if not more times

Ji Case 35172 · Dec 26, 2017

They look to be okay

rrlund · Dec 26, 2017

The old Oliver dealer told me one time that he's had tractors come in with carbon core wires that wouldn't even pull themselves in the door. They changed to copper core wires and that was all that was wrong.

Janicholson · Dec 26, 2017

Wiggle the Distributor cam shaft. any wiggle at all will allow the points to have floppy gap setting and cause major stumbling at different speeds. Jim

RandyB(MI) · Dec 26, 2017

Wiggle your throttle shaft around. Bet it and it's bushings are worn out. Gets worse when cold weather sets in as everything shrinks just enough to push it past it's 'safe zone" so to speak. Will wreak havok on running just like manifold leak or other carb problems. Causes lean condition and inconsistent missing/popping etc.

old · Dec 26, 2017

If that is so then you have missed something or you may have a bad cap or the distributor bushing could be going bad. Check point gap at all 4 lobes of the distributor cam.. I had one not long ago that the bushings where bad and the points did not open as wide as they should have so it made it a hard to start and run well machine

DeltaRed · Dec 26, 2017

You cant tell a bad plug wire just by "looking".

rlp in Co. · Dec 26, 2017

Spray carb cleaner around intake manifold area while it is running. A large change in the rpm means a leak.

JOCCO · Dec 26, 2017

If MAGNETO YOU COULD HAVE OTHER ISSUES like rotor and fields scored.

Leroy · Dec 26, 2017

You cannot tell if a condensoe is good by just looking at it. And no test that I know of.

flying belgian · Dec 26, 2017

I will preach this till I am blue in the face.===It is almost always the points. Replace the points first.===

showcrop · Dec 26, 2017

What is this? A year end special on timing jumpers? This Case guy must be the fifth one in about ten weeks that insists that he can't have a normal, simple to solve problem. Despite all the suggestions about the common problems that he may have he is sure that it has jumped timing.

casecollectorsc · Dec 26, 2017

Using a DC the other day. Never fails to start and runs fine. Started it and backed up to a piece of equipment to move it. Acted like it ran out of gas and quit. Poured in some gas and would not start. Pulled the cap off the distributor and the points had wore enough that they wouldn't open. Set them and starts and runs fine again...check the points.

Traditional Farmer · Dec 27, 2017

After you cleaned the carb did you put in a filter to stop crap from the tank stopping up the carb again?

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