Check The Cylinder Pressure; Detection Of Spark - LONCIN LC2V80FD Maintenance Manual

Part IV Faults Diagnosis

4-10 Check the cylinder pressure

1) Remove the spark plug cap and spark plug.
2) Install the pressure gauge onto the spark plug hole
3) Start the engine for several times to measure the compression
pressure.
Cylinder
pressure

4-11 Detection of spark

1) Remove the spark plug
2) Install the spark plug onto the spark plug cap.
3) Ground the (-) electrode (thread part) of spark plug and start the
engine to check the spark.
Warning
It is prohibited to touch the spark plug wire with wet hands during the test.
When touching the high-voltage line with wet hands, starting engine may cause high voltage, which is very
dangerous.
The falling fuel oil may ignite around the spark plug. Remove the fuel oil and then check. Stay away from the
spark plug hole when testing.
2
11-13 Kgf/cm
Pressure
gauge
Spark
plug
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