The external plumbing is just the normal line routing for a bypass oil filter. All stovebolt engines, even the dipper types, have an oil pump. He might have had the engine converted to pressure-lubed rod bearings, but the oil pan would have to be removed to check on that modification.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!