10. Shut off the water and remove the flushing attachment.
Seawater Pump Impeller Inspection
Service should be performed by an authorized Mercury MerCruiser dealer.
Inspect seawater pump impeller if insufficient seawater flow occurs (if operating
temperature exceeds normal range).
a - Seawater pump
Cleaning Seawater (Raw Water) Section of Oil Cooler
NOTICE
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.
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.
MAINTENANCE
70 eng
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