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Special Tools
Piston slideway Flywheel gripper Valve spring compressor kit
and flywheel puller
Clearance gauge Oil filter spanner
Check the Compression Pressure
1．Start the engine, warm it up for 5 minutes, then shut it down.
2．Remove engine stop safety line.
3．Remove the spark plug and connect the pressure gauge to the spark plug hole.
Attention:
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.
4． Fully open the throttle, turn the crankshaft with the starter or starting motor, and check
the cylinder pressure when the reading on the pressure gauge is stable.
Note:
For models using the control box, remove the throttle linkage, fully open the carburetor throttle lever
by hand, and then detect the pressure.
5．If the pressure is lower than the specified value or there is a difference between the
cylinders, add a small amount of oil to the cylinders and then carry out the detection.
Compression pressure: 840 kPa
Note:
If the cylinder pressure continues to increase, check the piston and piston ring for damage. Replace it
if necessary.
If the cylinder pressure does not increase, check the valve clearance, valve, valve seat, cylinder liner,
cylinder head and cylinder head gasket.
Adjust or replace it if necessary.
The outboard motor is equipped with automatic pressure relief device, and the data cannot be very
accurate.
Check the Oil Pressure
1. Start the engine, warm it up for 5 minutes, then shut it down.
2. Remove oil pressure switch and connect pressure gauge.
Note:
Use a manometer with a 1/8 pitch thread adapter.
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