13
C
HECKING
THE
END
COMPRESSION
PRESSURE
- With the engine cold, remove the spark plug cap.
- Remove the spark plug.
- Using a 10mm adapter, install a compression test manometer on the spark plug housing, and tighten at
the prescribed torque.
- Crank the engine using the starter motor and with the carburettor fully opened, as long as the manometer
reading has stabilized. If the pressure is within the prescribed limits, remove the manometer and refit the
components following the removal procedure in the reverse order.
- If the pressure is below the min allowable pressure, check the engine speed in test conditions. If this is too
low, check the starting system, if this is acceptable, or slightly faster, ensure the proper cylinder base gasket
is installed, and inspect the sealing of the thermal components (piston rings, valves, head, timing system,
etc.).
C
HARACTERISTIC
Compression pressure
Min allowable value: 10,5 Kgr
Engine revs:
~ 630 rpm (starting speed).
Locking torques (N*m)
Tightening torque
~
10
÷
15 Mm
MAINTENANCE
M
M
MAINTENANCE
C
C
G
CO
SS O
SSU
