Posted by pwyld on March 23, 2015 at 06:26:46 from (12.216.216.6):
I’m looking for some suggestions on a probable root case for my tractor stalling out. Here’s what I got: - 1956 International Harvester 300 Utility Tractor (Gasoline). - Refurbished the carburetor (used new carburetor kit, new gasket and new pin) – float works fine. - Cleaned fuel line & tank of debris, cleaned gas filter – fuel flows freely into glass filter vial. - Installed new oil and water temperature gauges. Oil gauge registers fine when tractor is running. - Tested water temperature gauge prior to installing in tractor. Water temperature gauge registers when sensor was put in boiling hot water. Facing the engine manifold the upper left exhaust manifold has a crack directly on top of it. I patched this up with JD weld. I know it’s a bandage solution, but crack goes back to the engine block. Didn’t want to chance brazing it that close to the engine block, nor wanted to risk taking it off and possibly breaking or snapping a bolt. Here’s the symptoms: Tractor fires up initially with no problem. Runs pretty well for about 15 to 20 minutes, even under load. Water temperature hardly registers. After engine is running for this amount of time, the engine starts to sputter and jerk as if it were not getting enough fuel. Again, the water temperature is just starting to register; still within the low range. If I let the tractor sit for a little while, say about 5 minutes, it fires up again; however, it will stall again approximately within 5 minutes say. In my opinion, the problem is somehow temperature related. I was thinking it might be the crack in the exhaust manifold, but that doesn’t make sense to me. I can see if it was the intake manifold sucking in air, which would make the air/fuel mixture too lean when the crack would expand when the engine heated up. But I didn’t visually see any cracks on the intake side. Plus, the water temperature gauge was reading very low, so the engine temperature was relatively cool. I’m wondering if anyone else out there had a similar problem, or any suggestion on what I should try next.
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