MerCruiser 305 CID (5.0L) Service Manual page 758

SERVICE MANUAL NUMBER 24
IMPORTANT: Cap MUST be replaced if damaged.
5. Using a cooling system pressure tester (similar to one shown), test cap to be sure 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 16 psi (110
kPa), and must hold rated pressure for 30 seconds without going below 11 psi. Replace
cap if it fails to fall within these limits.
IMPORTANT: Before reinstalling cap in next step, examine lower inside sealing sur-
face 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 be sure that they are not bent.
6. Reinstall cap on reservoir or heat exchanger.
Index
90-861327--1 OCTOBER 1999
c
a - Rubber Seal
b - Gasket
a - Sealing Surfaces
b - Coolant Recovery Passages
a
b
a
b
CLOSED COOLED MODELS
72714
72716
72715
Page 6B-9