NOTE:
If the cylinder pressure increases continuously, check piston and piston ring for damage. Replace if
necessary.
If the cylinder pressure doesn’t increase at all, check valve clearance, valve, valve seat, cylinder liner,
cylinder cover and cylinder cover gasket. Adjust or replace if necessary.
The outboard engine comes with an automatic decompression device, so the pressure data measured
may have variance.
OIL PRESSURE INSPECTION
1. Start the engine and preheat it for 5 minutes. Then stop it.
2. Remove the oil pressure switch and attach the pressure gauge.
NOTE:
Please use the pressure gauge equipped with 1/8in pitch thread adapter.
3. Check the oil pressure
Oil pressure (reference data): 110kPa (idling speed)
OIL PRESSURE SWITCH INSPECTION
1. Remove the oil pressure switch and attach the vacuum pressure gauge.
2. Load the stated pressure on oil pressure switch.
Inspect the continuity of oil pressure switch with digital circuit tester. Replace if unqualified.
Pressure Continuity
Above 14.7kPa Discontinuous
Below 14.7kPa Continuous
3. When the engine rpm increases, check the opening pressure of the safety valve. Clean or replace if
necessary.
Opening pressure: 388.0～450.0kPa
DISASSEMBLING POWER UNIT
1. Open the top cowling.
2. Remove starter.
3. Remove chokes cable and throttle cable.
4. Remove carburetor.
5. Remove flywheel with special tool.
Flywheel gripper and flywheel puller
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