I bought a used compressor and intend to change out the oil and install a HTF auto tank drain on it. The air pump does not have a dipstick or sight glass on it. Since the oil bung was in a tough location, most of the old oil ended up on the floor and could not be replaced with a similar volume. The pump is a Vee twin or four cylinder (thought is was a two, but the heads have a "8"-ish shape to them.. Pics are posted on alt.binaries.pictures.woodworking). Can anyone recommend an oil level relative to the crank or other point? Also, where can I learn more about this machine.. The 60?gal tank has a welded tag identifying it a 1956 John Wood of Conshohocken Penna. The motor is a 3 hp single phase AJAX, and this bad boy weighs in at about 400#.
many thanks!