CLOSED COOLING MODELS - 6B-2190-823225--1 1096
3. Inspect gasket (if used) and rubber seal on cap
for tears, cuts, cracks or other signs of deteriora-
tion. Replace gasket, if damaged, or entire cap if
rubber seal is damaged.
72714
b
c
a
a - Rubber Seal (Cap MUST BE Replaced if Damaged)
b - Gasket (Look for Cracks under Gasket)
c - Locking Tabs (1 Hidden)
4. Check that locking tabs on cap are not bent or
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 in-
structions which accompany tester for correct
test procedure.) Cap must relieve pressure at 14
PSI (97 kPa), and must hold rated pressure for 30
seconds without going below 11 PSI. Replace
cap if it fails to fall within these limits.
72716
IMPORTANT: Before reinstalling cap in next step,
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 be sure that they are not
bent.
72715
b
a
a - Inspect for Damage
b - Cam Lock Flange
6. Reinstall cap on reservoir or heat exchanger.
Thermostat
Removal
1. Follow instructions “a” and “b”:
a. Drain coolant from exhaust manifolds by re-
moving lower hose or drain plugs from each
manifold. Be sure to drain both port and star-
board sides.
NOTE: If coolant flow is restricted or fails to occur, a
wire should be repeatedly inserted into all drain holes
to insure there are no obstructions in passages. Re-
move petcock, if necessary, to insert wire completely
into drain hole.
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