Disassembly Of Engine Coolant Pump; Cleaning And Inspection - Yanmar 3TNV82A Service Manual

COOLING SYSTEM
Disassembly of Engine Coolant
Pump
1. Remove the thermostat cover (Figure 8-8, (1)).
Discard the gasket.
(4)
(3)
Figure 8-8
2. Remove the thermostat (Figure 8-8, (2)).
Discard the O-ring. Remove the temperature
switch (Figure 8-8, (3)) and gasket
(Figure 8-8, (4)). Discard the gasket.

Cleaning and Inspection

Temperature Switch
1. Check for proper operation of the temperature
switch. Connect a continuity light or ohmmeter
to the temperature switch. Connect one lead to
the terminal of the switch (Figure 8-9, (1)) and
the other lead to the metal portion of the switch
(Figure 8-9, (2)).
8-10
(1)
(2)
2. Place the temperature switch and an accurate
thermometer (Figure 8-9, (3)) in engine
coolant.
3. Slowly increase temperature of the fluid using
an external heat source.
4. The temperature switch is operating properly if
the continuity light or ohmmeter indicates
continuity when the fluid temperature reaches
225°F - 235°F (107°C - 113°C).
Thermostat
0000267A
1. Check for proper operation of the thermostat.
Place the thermostat (Figure 8-10, (1)) and an
accurate thermometer (Figure 8-10, (2)) in
warm water.
2. Slowly increase the temperature of the water
using an external heat source.
Engine Coolant Pump
(3)
(1)
Figure 8-9
(2)
Figure 8-10
TNV DI Service Manual
(2)
0000577A
(1)
0000577A