I pulled all 4 injectors on my Farmall 504's D188 and did not pull the pre-cups. Also, I did not pull the copper sealing washers per my diesel mechanic/injector man. He said as long as I did not "disturb" them then they were fine. I cleaned them and torqued them down. It runs like a new tractor.
Pictures of my 504 injector teardown...
I'm sure ya can tell which one was leaking. Also the injector man said since the ends of the injectors had a clean line around them that the copper washers were not leaking by. I replaced the injectors in the same holes, in the same orientation to minimize leaks.
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Today's Featured Article - Tractor Profile: Farmall M - by Staff. H so that mountable implements were interchaneable. The Farmall M was most popular with large-acreage row-crop farmers. It was powered by either a high-compression gas engine or a distillate version with lower compression. Options included the Lift-All hydraulic system, a belt pulley, PTO, rubber tires, starter, lights and a swinging drawbar. It could be ordered in the high-crop, wide-front or tricycle configurations. The high-crop version was called a Model MV.
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