Annual maintenance is usually carried out when the outboard boat engine is being winterised after laying up the boat at the end of the boating season.
Carry out all the tasks previously indicated for one month and three months, taking care to flush the motor with clean fresh water to remove any debris as well as salt deposits. Drain all water completely.<br>
The impeller pushes the cooling water round the engine. This normally needs to be replaced annually. Actually removing the impeller can be complicated on some engines. The manufacturer’s manual should explain how to access and remove it.
Four-stroke outboards need to have the engine oil changed. Warm the engine first, with it operating in clean water, in order to thin the oil before draining it. Wear protective gloves and unscrew the drain plug. Drain the oil into a suitable container, carefully removing the sealing ring before it drops into the oil. Remove the oil filter and clean or replace it.
If the oil is milky in colour, water has got into it. An engineer will need to rectify this.
Fill with oil specified by the manufacturer and check for leaks after running the engine.
To winterise the outboard, carry out all the previously mentioned maintenance tasks and check any additional requirements in the motor’s manual. These will include spraying appropriate types of oil onto the engine and into the spark plug holes to prevent corrosion. Lubricate all moving parts on your outboard boat engine. Check the starter cord and replace if necessary.
Store the motor safely clamped upright in a secure frost-free location.
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