12
96 Workshop Manual, TPD 1458E, issue 3 - Perkins Confidential: Green
400 Series
To test and to inspect Operation 12-6
Visually inspect for damage, renew the thermostat if the valve is open at ambient temperature.
1 Put the thermostat into the water.
2 Raise the temperature of the water gradually.
3 Record the valve opening temperature and the valve lift.
Notes:
l The start to open temperature is stamped on the thermostat
l 3 to 5 minutes will be required before the valve starts to operate.
Engine Temperature when thermostat
valve starts to open °C (°F)
Temperature when thermostat
valve fully open °C (°F)
403C-11 75 (167) 87 (189)
403C-15
404C-22
80 to 84 (176 to 183.2) 95 (203)
404C-22T 71 (159.8) 82 (179.6)
H1107
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