Thanks for the warnings about the modern GL-5 EP gear oils. Since the original manuals spec SAE 50 oil, I suspect that is what has always been used, at least here at the museum. Mind you, the brake steering isn't anything to write home about either, especially in first gear.
Kirk, I don't think we checked each engine idling down after hand operating the speed control lever with the linkage disconnected. I'll check that. The low speed and high speed springs look in good shape with good idle speed control and max rpm limited to about 2200 rpm. The buffer screw each side is just snugged up enough to tame the idle hunt so I don't think it's screwed in too far.
Malcolm
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