Shooting the breeze this morning at my mates place checking out his new yacht tender/work boat. It's an 18 foot clinker fibreglass put put and he has installed this single cylinder about 10 hp Sabb diesel. The motor came out of a 32 foot ferro yacht. The rocker cover is off in the photo so we could work out where the air intake was! The air comes in through the push rod tube! The rocker arms are in those enormous roller bearings. No oil pump, there is a paddle on the side of the crank that splashes oil on to roller bearings. The conrod is visible in the bottom photo and it's bigger than most trucks. To clean the sump you can put your hand in past the conrod. There is no oil filter. It's immaculate inside and will last forever.