CLOSED COOLING SYSTEM SERVICE MANUAL NUMBER 22
Page 6B-16 90-860074--1 FEBRUARY 2002
6. Examine lower inside sealing surface in filler neck to ensure that it is perfectly smooth
and free of debris. Also, inspect cam lock flanges on sides of filler neck to ensure that
they are not bent.
72715
a
b
a
b
a-Filler Neck
b-Cam Lock Flange
7. Using a cooling system pressure tester similar to one shown, test cap to ensure that it
releases at proper pressure and does not leak. Refer to instructions which accompany
tester for correct test procedure. Cap must relieve pressure at 97 kPa (14 psi), and must
hold rated pressure for 30 seconds without going below 76 kPa (11 psi). Replace cap
if measured values are less than specified.
72716
Typical Pressure Cap Tester
8. Reinstall cap on heat exchanger.
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