Cleaning Seawater (Raw Water) Section Of Oil Cooler - Mercury 540 Bravo Manual

10. Shut off the water and remove the flushing attachment.

Cleaning Seawater (Raw Water) Section of Oil Cooler

An open seawater strainer or seacock during some service or maintenance
procedures can introduce water into the boat, causing damage or sinking the
boat. Always close the water supply from the seawater pump, water inlet, or
seacock when performing service or maintenance on the cooling system.
The seawater section of the oil cooler should be cleaned at least once a year or
whenever decreased cooling efficiency is noticed.
ENGINE OIL COOLER
NOTE: The engine oil cooler is located on the top rear portion of the engine.
1. Remove end plates and gaskets.
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a - End plates (2)
2. Clean oil cooler with a suitable brush.
3. Flush passages with fresh water.
4. Inspect gaskets for deterioration and replace if necessary.
5. Install gaskets and end plates. Tighten the screws securely.
POWER STEERING COOLER
NOTE: The power steering cooler is located on the lower port side of the
engine.
1. Loosen water hose clamps and remove hoses if it is necessary to inspect
or clean the cooler.
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MAINTENANCE
NOTICE
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