Repair 7

How to Change Your MerCruiser Oil

To ensure that your MerCruiser engine powers your boat sufficiently, it is important to change its oil every year or after 100 hours of use, whichever comes first. Changing your MerCruisers oil requires you to hand pump the oil out of the system before refilling the crankcase and replacing the oil filter.

Instructions

1

Run your MerCruiser engine for ten to fifteen minutes to ensure that the oil in the engine is properly warmed up. This will aid in the siphoning of the oil from the engine.

2

Remove the dipstick.

3

Attach the threaded oil pump to the threaded end of the hole from which you took the dipstick. The specialty threaded oil pump can be purchased from a boating store or supplier.

4

Unscrew and remove the oil fill cap.

5

Punch a hole into the top of the oil filter with an awl and a hammer. Punching a hole into the oil filter before siphoning the oil from the engine will allow air to enter the crankcase and help in the pumping process.

6

Crank the hand pump until your MerCruisers crankcase is drained of oil. Drain the oil into an oil tray.

7

Use a strap wrench to remove the old oil filter.

8

Wipe the point at which the new oil filter will attach to the engine to remove all debris before wiping new engine oil around the edges of the connection.

9

Reattach the new oil filter by hand.

10

Fill your MerCruiser with the amount of oil specified in your owners manual.