Autumn and spring plan for Mercury FourStroke 15 / 20
Here's what to do when hauling out and launching. Always follow the instruction book for your engine.
Autumn
Change the engine oil and oil filterService kit 300 h (fuel filter, oil filter, spark plugs, seals, water pump kit) 8M0172123 · 1 l NMMA FC-W 10W-30, above 4 °C also FC-W 25W-40 · every 100 hours or annuallyBuy: Marinshopen ↗
Change gear oilevery 100 hours or annually
Check the water-separating fuel filterService kit 300 h (fuel filter, oil filter, spark plugs, seals, water pump kit) 8M0172123 · Replace as needed. · every 100 hours or annuallyBuy: Marinshopen ↗
Check the anodesevery 100 hours or annually
Lubricate all grease pointsevery 300 hours or every 36 months
Flush the engine with fresh water
Lubricate according to the lubrication schedule
Store the engine upright so that water drains out
Spring
Check the thermostatPerformed by a Mercury workshop. · every 100 hours or annually
Check the timing beltPerformed by a Mercury workshop. · every 300 hours or every 36 months
Replace the impellerPerformed by a Mercury workshop. · every 300 hours or every 36 months
Check the gearcase oilMilky oil means there is water in the gear housing.
Check the propeller and anodes
Check that cooling water comes out of the tell-tale hole