Nanni T4.155 seriers, Workshop Manual

Page: 35 / 191

60300140 (
indice A
) 4 CYLINDERS WORKSHOP MANUAL 35/191
Compression pressure:
3.040 kPa (31.0 kgf/cm²) or more
Minimum pressure:
1.961 kPa (20.0 kgf/cm²)
Pressure difference between cylinders:
Less than or equal to 490 kPa (5.0 kgf/cm²)
e) If the compression pressure of one or more cylinders is less than that of
the other cylinders, pour a small amount of engine oil in the injection port
and repeat checking operations a . to c . on the cylinder where the pressure
is low
- If adding engine oil in the cylinders makes it possible to increase the compression
pressure, it is probable that the failure is due to wear or damage to rings and/or
cylinder bore.
- On the other hand, if the compression pressure does not change, it is probable
that this is due to a stuck valve, a poor seat or a broken gasket.
5) REINSTALL THE INJECTORS
6) RECONNECT THE INJECTION PUMP WIRING COUPLING UNIT
(POWER SUPPLY CUTOFF CONTROL SOLENOID).
7) START THE ENGINE AND VERIFY WHETHER FUEL LEAKS
OCCUR.