Cylinder Pressure Measurement - Segway VILLIAN SSV Series Service Manual

CYLINDER HEAD, CYLINDER, PISTON CYLINDER HEAD, CYLINDER, PISTON

Cylinder pressure measurement

TIPS
Fully charge the battery before measuring
◆ Warm up the engine completely, then stop it.
◆ Disassemble the spark plug (refer to the spark plug chapter).
◆ Connect the cylinder pressure gauge and the connector fi rmly to the spark plug hole.
◆ Special tools-cylinder pressure gauge, cylinder pressure gauge connector.
◆ Keep the throttle fully open and use the starter motor to drive the engine several times.
◆ When the pressure gauge stops rising, stop rotating and read the pressure value.
Electric starter:
If the pressure value obtained is not within a reasonable range, you should refer to the following table.
problem
Cylinder pressure
v a l u e i s o u t o f
reasonable range
Cylinder pressure
value is lower than
t h e r e a s o n a b l e
range
Cylinder pressure (reasonable range)
diagnosis
Due to the valve oil seal and/or piston oil
ring damage, the piston, cylinder head
and combustion chamber produce carbon
deposits (can be determined by the white
smoke exhaust).
The thickness of the cylinder head gasket is
incorrect.
the valve spring is damaged or the elastic
force fails,
Air leakage around the cylinder head
Bad valve seat condition
Incorrect valve clearance
Piston/cylinder hole clearance is
unreasonable.
Bad condition of piston ring and/or piston
ring groove
1.1 ~ 1.3 MPa (11~13 kgf/cm², 159~188 psi)
3-5-42
Measures (actions)
Remove carbon deposits
and replace damaged parts if
necessary.
Replace with standard gaskets.
replace the spring.
Replace the damaged cylinder
head gasket and check for
deformation of the cylinder
head.
Repair if necessary.
Adjust the valve clearance.
Check the cylinder block and
replace/repair if necessary
Replace the piston and/or
piston ring.