Posted by Owen Aaland on August 12, 2014 at 13:29:54 from (216.47.34.49):
In Reply to: 1568 Questions posted by John M on August 12, 2014 at 05:31:34:
The engine runs on four cylinders, two on each side, until the engine load reaches 20%. As the load increases the other four cylinders start to fire until at 80% all cylinders are getting equal amounts of fuel. Above 80% load it runs evenly on all eight. Which four cylinders that are working all the times depends on when the tractor was made. Part way through production they changed which four cylinders ran all the time. Both systems fires the two center cylinders on one side and the end cylinders on the other.
The main reason IH gave for running on only four cylinders at idle and light load was to insure that those cylinders that were working would have enough load on them to keep them warm enough to clear up smoke from a cold cylinder.
Starting with ether assist is standard procedure at temperatures below 70° F. Push the ether assist button after getting the engine to crank over and continue to feed ether after it starts until if no longer pushes out white smoke.
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