Posted by NawlensGator on May 10, 2009 at 09:46:14 from (68.155.73.51):
I posted last week about lack of consistant spark at the #1 plug after the engine warmed up (after about 25 min). Tractor would start sputtering and lose significant power. Went through the elec system and found the electronic ignition pickup had loosened. Tightened up and same thing, but now had steady spark on all plugs. Last week replaced SPlug wires (also coil, plugs, dist cap, & rotor, and cleaned the fuel lines, strainers and replaced the sediment screen and gasket). Reset valves. Same thing. IH dealer said he was sure it was in the ignition system and sold me a 3 ohm resistor which I tried in the ig wire to the coil. I didn't think it would work but I had to try his advice. No change. I just don't know what to do next.
Problem started again this morning before tractor had warmed up. So now I'm thinking there might be a valve problem, or worse. Anyway to tell if one is sticking or burnt? Compression test? Yank the head? The #1 valve rocker arm has some side to side slop and it and looks like the washer in front has some wear, but I can't make it miss the valve stem. Thanks in advance for any advice.
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