20 - 0005 Technical data
Coolant thermostat
Standard version Tropical version
Start of opening at °C 81 to 85 69 to 73
Main valve Stroke in mm 8
Fully open at °C 95 85
Bypass valve Stroke in mm 6.0 to 7.5
Closed at °C 92 82
Leak water quantity of 0.67 to 1.17
main valve at 1 bar
and 20 °C in l/min
max. flow quantity with 333
main valve open and
pressure of 1 bar in l/min
Coolant pump
Coolant pump At impeller seat 15.039
shaft diameter 15.028
Large bearing 30.009
29.996
Bearing seat
Small bearing 17.008
16.997
Shaft diameter for hub 29.054
29.041
Bore diameter in hub 29.021
29.000
Hub diameter for 42.000
front seal 41.840
Shaft diameter for 17.008
rear seal 16.997
Bore diameter 15.018
in impeller 15.000
Radiator cap
Code number 100 or 1.0
Pressure relief valve opens at bar 0.9 to 1.15
Vacuum valve opens at bar 0.1
Test cooling system with overpressure in bar 0.9 to 1.2
Tightening torques in Nm
Coolant pump to crankcase M8 30
M10 50
Fan to coolant pump hub 35
Thermostat housing to cylinder head 30
Cover to thermostat housing 35
Drain plug to crankcase 55
Temperature sensor to thermostat housing 30
Seal holder to coolant pump housing 30
Capacities
Cooling system approx. 13.5 l
Coolant Sheet no. *) 310, 311, 325.2
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