Cleaning And Inspection - Mercury MerCruiser D2.8L D-Tronic Service Manual

CLOSED COOLING SYSTEM
7. Remove combination heat exchanger and engine oil cooler.
Heat Exchanger / Engine Oil Cooler and Related Components
8. If either the closed cooling section or oil cooler portion of the heat exchanger are
defective, it will be necessary to replace the complete assembly.

Cleaning and Inspection

1. Clean water passages in heat exchanger by inserting a suitable sized wire brush on a
proper length rod into each passage.
2. Put on safety glasses.
3. Blow loose particles out of, and from between, water passages using compressed air.
4. Provided the passages for seawater are acceptably clean and free of debris, clean the
exterior of the heat exchanger with soap and water. Scrub gently with a brush as
required.
5. Visually inspect all exterior surfaces and water passages for cracks or damage. Repair
or replace as required.
Page 6B-28
a - Hoses
b - Clamps
c - Coolant Vent Hose Fitting
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c
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SERVICE MANUAL NUMBER 22
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90-860074--1 FEBRUARY 2002
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