SEAWATER COOLING SYSTEM
SERVICE MANUAL NUMBER 22
90-860074--1 FEBRUARY 2002 Page 6A-39
7. Inspect cooler / exchanger passages.
• If passages are clear: Reconnect seawater hoses and tighten hose clamps secure-
ly.
IMPORTANT: Mercury MerCruiser does not recommend the immersion of oil/power
steering/ transmission fluid coolers in cleaning solutions. If backflushing and/or wire
brushing of the problem cooler does not satisfactorily clear the passages
replacement of the cooler is recommended.
• If passages are still obstructed:
a. Clean tubes in heat exchanger and coolers by operating a suitable wire brush of the
proper size through each tube.
71724
a
a-Wire Brush, Sized to Fit Passages
b. Rinse out heat exchanger and cooler tubes with tap water from a hose to remove
loosened particles.
c. Replace unit if it cannot be satisfactorily cleaned. Refer to the following section.
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