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Thanks for the info everyone. I did some more searching myself and found the service manual for the series 53 engines: Link Changing the tach, like many things on this engine requires precission adjustments and special tools. I also want to correct something I posted earlier: The injectors do...

members of this forum have been a great help. thanks! I've got a 4-53 gm diesel with blower running a 1967 hein-werner c12-hd hydraulic excavator. The engine was manufactured in 1966. The guys who know the series 53 engine are getting fewer and farther between. I need a tachometer and the...

Thanks for all the help! I really appreciate it.

I'd say that the engine went to the max rpm that the governor is set to(2200 rpm). It stayed there for about 20 seconds and then dropped down to the slow idle I normally expect with the throttle lever in the slowest position (which is where it was when I pressed the start button-- but note, I...

Is the govener the assembly that the throttle cable attaches to?

Thanks for all the great advise. Three of the four injectors are, I believe, original-- I replaced one. I'm going to replace the three old ones. This 1966 4-53 gm diesel has an emergency air shut-off accessible just below the blower. But I've read some horror stories on runaway detroits sucking...

I have 1966 4-53 diesel engine in a hydraulic excavator of the same year. Today when I started the engine it floored itself to full throttle and held itself there for about 20 to 30 seconds in spite of the fact that I had the throttle off. Then it dropped itself down to idle. I always push the...