[AT] IH 2504

[Dennis Johnson]

Last week I was at my Oklahoma cabin and finally figured out what was going on with my IH 2504. It would run for a few minutes until things warmed up, and then loose power and die. It was progressively getting worse. It acted like it was running out of fuel. Would set a minute, and then restart for a little, and die again. I thought it was a fuel issue, but gravity seldom fails and I had took settling bowl and card apart and all looked acceptable.
It finally dawned on me that I had a valve issue, and intake valve was heating up and holding open enough to ruin the vacuum where it would not suck fuel mixture into engine. Was not able to check compression because my special sockets were in my Texas shop.
Got some "charity case" Isuzu put together to clear my cabin garage (out temporarily-it is missing compression so I will need to pull head and fix valves) Then I drove the tractor in and pulled the head on it. Bit of a pain to do with loader on it.
Findings were:
#1 - bent pushrods was off of the rocker, so intake would not open and cylinder not firing.
#2 - significant exhaust valve leak
#3 & #4 - valves hold gas in head, probably adjustment was out on one or both.
Exhaust and Intake manifold was missing about 1/8" of casting on the #1 port.
Head now at machine shop, and replacement manifold and gaskets are ordered.
I need to work on throttle linkage - it is stuck in one position and will not move. Also need to install some working and readable gauges.
Hopefully I can get head back and parts in so that I can  next time I go to cabin. Need to fine torque for head bolts, and valve adjustment values. I need to remember to get my old oversized plug sockets - plugs look larger than the normal 13/16" hex size. Only needed to use these special sockets once every 10 or 15 years, so I hope I can find them.

Dennis

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