Engine Seawater Pump Inspection - Mercury MerCruiser Diesel Inboard 2.8L Operation & Maintenance Manual

1. Close the seacock (if equipped) or disconnect and plug the seawater inlet hose.
a
a - Seacock
b - Seawater inlet hose
c - Plug
2. Using a suitable adapter, connect a flushing hose from a water tap to the seawater inlet hose connected to the seawater
pump inlet.
3. Partially open the water source to about 1/2 maximum. Do not use full water pressure.
4. Place the remote control in the neutral, idle speed position and start the engine.
Operating the engine out of the water at high speeds creates suction, which can collapse the water supply hose and overheat
the engine. Do not operate the engine above 1400 RPM out of the water and without sufficient cooling water supply.
5. Operate the engine at idle speed in neutral for about 10 minutes, or until the discharge water is clear.
6. Observe the water temperature gauge to ensure that the engine is operating in the normal range.
7. Stop the engine.
8. Shut off the water tap.
9. Remove the adapter from the seawater pump inlet hose connection.
10. To prevent water from siphoning into the boat or engine, do not open the seacock or reconnect the water inlet hose at this
time.
11. Place an appropriate tag on the key switch stating that the seacock must be opened or the seawater inlet hose must be
reconnected before operating the engine.

Engine Seawater Pump Inspection

IMPORTANT: Mercury strongly recommends that this service be performed by a Mercury Diesel authorized repair facility.
Remove and inspect the engine seawater pump at the interval specified in the Maintenance Schedule. See your Mercury
Diesel authorized repair facility.
90-8M0133679 JUNE 2017
eng
c
a -
b -
d
c -
d -
a
b
23450
NOTICE
Section 4 - Maintenance
b
c
13171
2.8 shown, 4.2 similar
Adapter
Flushing hose
Water tap
Seawater inlet hose
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