I took a brass bolt and flattened one side for rolling out main bearings. Just stuck it in the oil hole and barred the engine over. Used a turn buckle placed over 2 head studs, a metal plate, and a hydraulic jack to press in cylinder liners. Needed a tool to lock up the clutch on my dirtbike, so I just stuck some solder in the teeth of counter balancer gear.

Whenever someone buys an engine for a ship, the manufactuer provides the yard with all of the special tools required to maintain the engine. A lot of times, it is just bent wrench, or has some weird handle welded on it so it can get into the tight places. It makes eninge manufacturers very angry when engineers lose special tools (often means the crew is incompetent which could lead to engine failure and when a multi-hundred million dollar engine fails, you had better believe there is going to be some failure analysis done by the manufacturer) the manufacturer will reluctantly provide the specially bent wrench for a small sum of $800-$1500 dollars. They are all very homemade looking and not of manufactured quality, either.