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|John Goetz||I have 1974 Ford 3000 series industrial tractor.The motor has been rebuilt ( bore, rings, head job, bearings, After I increase the engine speed the number 3 cylinder quites firing. Bench checked the injectors and the injector pump, changed the filter and bled the system four or five times. Swapped the injectors from cylinder to cylinder and replaced the pump with another pump, it is always the back cylinder that stops firing. HELP Thanks
Has been my experience that the valves are too tight on that cylinder causing them to float out at upper RPM. If I remember correctly they set .18 on both the intake and exhaust valves. This is with the engine at normal operating tempature. Temporarily loosen those two rocker arms 1 turn each and retry engine to see if miss goes away. If so re-adjust all the valves to a loose.18 on both intake and exhaust. Some books give different clearances but Ford issued a service bulletin with these clearances and many independent books don't state the proper clearance for these engines.