Today I came across a old air compressor with a Detroit Diesel motor in it. Its a 4 cylinder and has the blower mounted on the right side of the motor. The valve cover says Detroit Diesel on it. I'm sure the motor has a tag someplace. The bellhousing appears to be a sae bolt pattern. I'm going to get some pictures of it in the morning. Is this type of motor usable in a truck or by design is it only usable as a power unit?

Thanks