109500 EFI Bravo
MAINTENANCE
CB73
Cleaning Seawater (Raw Water) Section of Oil
Cooler
CAUTION
When cleaning engine oil or power steering coolers with the
boat in the water; be sure to close off the water supply from
the seawater pump to the cooler or water may enter the boat
when end plates or hoses are removed.
Seawater section of oil cooler should be cleaned at least once a year
or whenever decreased cooling efficiency is noticed.
1 Engine Oil Cooler - Remove end plates and gaskets. Clean oil
cooler with a suitable brush. Flush passages with fresh water. In-
spect gaskets for deterioration and replace if necessary. Install
gaskets and end plates. Tighten screws securely.
2 Power Steering Cooler - Loosen water hose clamps and re-
move hoses if it is necessary to inspect or clean cooler. If the oil
hoses need to be removed from the cooler, be prepared to cap
or plug them to avoid draining the power steering reservoir. Re-
install cooler and tighten hose clamps securely. Check power
steering fluid level.
Start engine and inspect cooling system for leaks.
CA99
Changing Positive Crankcase Ventilation Valve
This engine is equipped with a positive crankcase ventilation valve
(PCV). This valve should be changed every 100 hours of operation
or at least once a year, whichever occurs first.
• Remove hose from PCV valve and pull valve out of intake man-
ifold.
• Install new PCV valve in intake manifold and reconnect hose.
• Ensure valve is tightly seated in manifold.
Use only MerCruiser replacement parts.
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