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18-10-2004
18-10-2004
00
REG. CODE
1-5302-662
MODEL N°
51092
DATE OF ISSUE
REVISION
DATE
ENDORSED
COMPILER TECO/ATI
VII
COOLING SYSTEM
Checks on thermostat valve
Dip the thermostat valve into a metal container ( a pan ) filled with water.
Procure a thermometer with max reading of 150 °C and dip in also in the same container to monitor the water temperature.
Heat up water and check – by means of the thermometer – that the thermostat valve starts opening at the required temperature
of 80° ±2° C.
If the valve opening temperature is different replace the thermostat.
With the previously described setting, keep heating the water up to 95 °C : at this temperature the valve must be completely
open, meaning that the lift is 7 mm.
Make sure that in cold water the valve is definitely closed.
In cased the thermostat valve would not open, the result is a substantial increase of the coolant temperature with abundant
overflow of the coolant itself out of the expansion tank.
Checks on water pump
Water pump is provided with two drain channels located in the upper part to the purpose of unveiling possible liquid leakages
thus indicating an incipient failure of the pump seal.
Particularly during the engine run-in period small leakages of fluid are to considered normal.
Make sure the pump shaft does not show any axial clearance and can turn freely without undue localised friction.
Check that the impeller is free from dents, cracks or – worse – some blade is broken or missing at all.
If anyone of these checks is negative, just replace the water pump.
When re-assembling, replace the O-ring seals, tighten the fixing screws with a torque wrench at the indicated torque of 12÷15
Nm and check for a free turning of the pump after the tightening.
Replace the gasket of the inlet fitting of the pump.
Replace the timing belt.
Cooling liquid circulating pump
Components:
1 Water pump case
2 Snap ring
3 Water pump bearing
4 Water pump sealing
5 Water pump impeller
6 Pulley
7 Shaft
Thermostatic valve
1 Case
2 Air vent
3 Valve head with wax sensor
Features:
Opening temperature: ...... 80° ± 2° C
Max stroke at 95° C: .......... 7 mm
Liquid return ...................... 30/80 lt/h
The following operation must be performed with the utmost
attention. The water temperature reaches very high values –
near boiling (about 100°C). Serious burns can result from
contact.
Pay attention to splashes and overflows. Be careful not to knock
over the container
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