Nanni T4.155 seriers, Workshop Manual

Page: 138 / 191

60300140 (
indice A
) 4 CYLINDERS WORKSHOP MANUAL 138/191
CHECKING THE THERMOSTAT
CHECK THE THERMOSTAT
ADVICE:
The thermostat is marked with a number according to the valve opening
temperature.
a. Dip the thermostat into water and heat the water gradually.
b. Verify the valve opening temperature.
Valve opening temperature: 71°C
Replace the thermostat when the valve opening temperature is not
within the limits complying with specifications.
c. Verify the valve lift.
Valve lift: 8 mm or more at 85°C
Replace the thermostat when the valve lift is not within the limits
complying with specifications.
d. Check that the thermostat spring is fully stretched when the
thermostat is fully closed.
Replace the thermostat if not fully closed
REINSTALLING THE THERMOSTAT
(refer to component part illustration for removal and
reinstallation)
1. REINSTALL THE THERMOSTAT ON THE
CYLINDER BLOCK
a. reinstall a new gasket on the thermostat.
b. Reinstall the thermostat, taking care to direct the valve stud
of the thermostat upwards.
2. REINSTALL THE WATER FEED PIPE ON THE
CYLINDER BLOC
Reinstall the water feeder pipe.
Recommended tightening torque:
13 N.m (130 kgf.cm)
3. FILL THE ENGINE WITH COOLANT
4. START THE ENGINE AND VERIFY WHETHER
COOLANT LEAKS OCCUR