Cooling,               Raw water. Pump twin impeller . One circulates cooling water

                              the other is a bilge pump

                      OR :-

                              Heat exchanger with a similar pump. One impeller pumps raw

                              water past  the heat exchanger, the other circulates coolant

                              around the engine.

Transmission,     Conventional gearbox lubricated by engine oil. Can have a

                              reduction box attached. This has its own lubrication.

                              Note :- Diesel 30 grade  only in the engine.  Not multi grade

                              which will make the gearbox slip.