First, a "Jimmy 6-110" is a General Motors (predating the Detroit Diesel name) 6-cylinder diesel that displaced 110 cubic inches per cylinder (6-110, get it?). They are long out of production (last was 1954 IIRC).
The Rest of the Story:
The aforementioned 6-110s powered the generators on an Army vessel I served aboard. They held some 25 gallons of oil and the crankcases were plumbed to a waste oil system with a pump. Normally, it was an easy change... except that the drain valve was jammed/broken on the one generator, so we had to dismantle the plumbing and valve, collect the oil from under the engine (in buckets), then replace the drain valve. It was messey enough trying to catch the oil while removing a valve and a pipe nipple but it was complicated by something worse. Unfortunately, we had just had the bizarre experience of finding thousands of baby eels clogging one of our sea chests, essentially a box welded to the inside of the hull and used in this case to connect the cooling water inlet pipes to the generators. We had eight generators and when they began overheating, we found the eels had clogged the screens in the sea chest, almost stopping the flow of water. In the process of cleaning the screens, lots of them had oozed into the bilges, died in the oily bilgewater and gotten quite rank by the time I was "elected" to crawl under the deckplates to drain the oil and replace the valve. The PTSD continues!