Parsun F40 EFI, Maintenance Manual

Page: 65 / 119

60
Special tool
Piston slideway flywheel gripper and flywheel puller Valve spring compressor kit
Clearance gauge Oil filter spanner
Check the compression pressure
1
．
Start the engine, warm it up for 5 minutes, and then shut it down.
2
．
Remove the engine stop safety line.
3
．
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.
4
．
Fully open the throttle, turn the crankshaft using the starter or start motor, and check the
cylinder pressure when the reading on the pressure gauge is stable.
Note:
For the control box in use, remove the throttle linkage, open the carburetor throttle
lever fully by hand, and check the pressure.
5
．
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.
Compression pressure: 840 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 gasket. Adjust or replace them if necessary.
The outboard motor is equipped with an automatic decompressor, so the data cannot be
very accurate.
Check oil pressure
1. Start the engine, warm it up for 5 minutes, and then shut it down.
2. Remove the oil pressure switch and connect a pressure gauge.
Note:
Use a pressure gauge with 1/8 pitch thread adapter.
3. Test oil pressure
Oil pressure (reference data): 230kpa (60℃, 950±50 r/min)