Mitsubishi diesel engines Service Manual page 141

COOLING SYSTEM - DISASSEMBLY, INSPECTION AND REASSEMBLY
1. Thermostat
1.1 Disassembling the thermostat
<Disassembly sequence>
‡ @ Thermostat cover
‡ A Gasket
1.2 Inspecting the thermostat
Place the thermostat in a container filled with
water. While heating the water, measure the
water temperature at which the thermostat starts
to open, and also the water temperature at which
the valve lift reaches 8 mm (0.315 in.). If the
measured temperatures do not conform to the
standard values, replace the thermostat.
Valve opening
temperature
82• } 1.5 (179.6• } 2.7)
This is a "hot" operation. Pay every attention to
prevent burns and fire.
5 - 6
Disassembly of the thermostat
Unit: • Ž (• ‹ ‚ e )
8 mm (0.315 in.)
valve-lift temperature
95 (203)
Replace: Gasket
‡ B Thermostat
‡ C Thermostat case
Stir the water for even temperature
Inspecting the thermostat