4-25 4-25
Mercruiser Manual Three Point Drain System
1. Use this procedure if the engine is not equipped with an
air activated single point drain system.
2. Start by removing the blue plug in the thermostat housing
to allow the system to drain down from that point.
3. Remove a blue plug from the distribution housing located
on the lower port side of the engine.
4. Remove two (2) blue plugs from the raw water pump
located on the lower starboard side of the engine.
5. Verify that water is draining from each opening. Allow
the system to drain for a minimum of five (5) minutes.
6. Place plugs in the important papers pouch.
7. Crank the engine over with the starter motor to purge
any water trapped in the seawater pump.
8. Do not allow the engine to start.
Warning: Do not drain anti freeze from
the closed cooling system drain plugs.
The Thermostat Housing is located in
front of the engine at the top.
Raw Water Pump
Distribution Housing
Blue Plug
Drain Location
Storage And Commissioning
Figure 4-19
Figure 4-20
Figure 4-21
Fuel Cooler
Figure 4-22
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