Lombardini CHD series - Cooling System Components; Expansion tank and cap; Checking for cooling system leaks; Coolant circulating pump

- 65 - Workshop Manual LDW CHD _ cod. 1.5302.345 - 6° ed_rev. 05
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Expansion tank and cap
The expansion tank is separated from the radiator and is tted
withacoolantllcap.
The cap comes with vacuum valve 1 and pressure relief valve 2.
The pressure relief valve opens at a pressure of 0.7 bar.
Thermostat
1 - Air valve
Specications:
Opening temperature: 77°/81°C
Max. stroke at 94°C = 7.5 mm
Coolantowratewiththermostatandvalveinclosedposition=
15 Liters/h.
Coolant circulating pump
Impeller 3 and hub 5arettedtotheshaftbypresst.
To remove the impeller, screw the M 18x1.5 bolt into bore 2.
To remove that shaft take 4 which locks the bearing to the pump
body. A seal is located on the shaft between the bearing and the
impeller.
In case of worn-out seal, coolant leaks from hole 1.
LDW 1503 - 1603 - 2004 - 2204:
The ratio between the pump and engine rpm = 1:1.2
Pump delivery at 3000 rpm is 70 liters/min.
LDW 2004/T - 2204/T:
The ratio between the pump and engine rpm = 1:1.5
Pump delivery at 3000 rpm is 116 liters/min.
Checking for cooling system leaks
Remove the cap from the expansion tank and check coolant
level.
Replace the cap with one tted with portable hand air pump
couplingasshowninthegure142.
Compress air at a pressure of 1 bar for approximately 2 minutes.
Check that no leaks occur.
Caution – Warning
In very dusty working conditions verify and clean the
outside of the radiator frequently.
 Replacecoolantasspeciedonpage22.
Cooling system