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Fig. 26
The water pump seal is replaceable. See Section 4.
If system does not maintain pressure and no leaks are
evident externally, there may be an internal leak such as
a blown head gasket, warped cylinder head or cylinder
block.
Testing Radiator Cap
Make sure that rubber seal on radiator cap is not
damaged or distorted. Rubber seals must be clean and
free of debris to seal properly.
1. Install radiator cap on pressure tester and
pressurize the cap.
Specification: 11 ~ 15 psi (0.75 ~ 1.03 Bar )
Replace cap if not within specification.
NOTE
: Recommended pressure cap capacity is
.
13 psi (0.9 Bar)
Checking Thermostat
A thermometer capable of reading
more is required.
1. Check to make sure thermostat valve is fully
closed.
2. Immerse thermostat in water and heat water
gradually, Fig. 27.
3. Note temperature when thermostat starts to open.
a.
178 ~ 183° F (81 ~ 84° C)
4. Note temperature when thermostat is fully open.
a.
203° F (95° C)
Page 22
Fig. 27
CHECK OIL PRESSURE SWITCH
Use Digital multimeter,
continuity.
Remove pressure switch for testing. Connect one
continuity tester lead to the switch terminal and the other
tester lead to the metal body of the switch, Fig. 28. The
tester should indicate continuity when no pressure is
applied to the switch. The switch should open (no
continuity) when approximately 8.0 psi (0.55 Bar) is
applied. Replace the switch if test results are not to
specification.
or
212° F (100° C)
Fig. 28
TM
Vanguard
Twin-Cylinder OHV Liquid-Cooled Engine
5. Remove thermostat from water and allow it to
cool.
a. Thermostat should close fully.
Tool #19464
Section 2 - Troubleshooting
. Set meter to test for
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