Here's what to do when hauling out and launching. Always follow the instruction book for your engine.
Autumn
Drain the water separatorevery 50 hours or every 1 months
Check the battery electrolyte levelevery 50 hours or every 1 months
Change the saildrive oilevery 100 hours or every 6 months
Change the engine oilevery 150 hours or annually
Change the gearbox oilevery 150 hours or annually
Winterise the raw water systemLet the engine draw in antifreeze until it comes out of the exhaust, or drain the system as described in the owner's manual.
Check anodes, belts and hoses
Fully charge the batteries and disconnect the negative terminal
Spring
Adjust the alternator belt tensionevery 250 hours or annually
Clean the air intake silencerevery 250 hours or annually
Inspect the raw-water pump and impellerevery 250 hours or annually
Check the electrical connectionsevery 250 hours or annually
Check belts, hoses, oil level and coolant
Check through-hulls, seacocks and hose clamps
Charge and connect the batteries, clean the terminals
After launching, check that nothing is leakingStart the engine and check that cooling water flows out evenly.