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Special tool
Piston slideway Flywheel gripper and flywheel puller Clearance gauge
Oil filter spanner
Check the compression pressure
1．Start the outboard motor, warm it up at idle speed for 5 minutes, and then turn it off.
2．Remove the spark plug and connect the pressure gauge to the spark plug hole.
Note:
Before removing the spark plug, clean the pit where the spark plug is installed with
compressed air to prevent dust or other sundries from entering the cylinder.
3．Fully open the throttle, turn the crankshaft (start), and check the cylinder pressure when
the reading on the pressure gauge is stable.
Note:
When checking cylinder pressure, do not change throttle opening.
4．If the detected pressure is lower than the specified value or there is a difference between
cylinders, add a small amount of oil into the cylinders and then detect it again.
5．Compression pressure: 945 kPa
Note:
If the cylinder pressure continues to increase, check whether the piston and piston ring
are damaged. Replace it if necessary.
If cylinder pressure does not increase, check valve clearance, valve, valve seat, cylinder
liner, cylinder head and cylinder head seal ring. Adjust or replace them if necessary.
Check oil pressure
1. Start the engine, warm it up for 5 minutes, and then shut it down.
2. Remove the oil pressure sensor and connect the pressure gauge.
Note:
Use a pressure gauge with 1/8 pitch thread adapter.
3. Test oil pressure
Oil pressure (reference data): 440kpa (at idle speed)
660kpa（@3000 r/min）
Note:
The actual oil pressure varies according to temperature and oil viscosity.
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