Mercruiser Air Activated Single Point Drain System; Figure - Chris-Craft 32 Launch (RJ) Owner's Manual

Mercruiser Air Actuated Single Point Drain System
1. This procedure refers to the air pump attached to the front
of the engine. Any air source can be used.
2. Water left in the engines will freeze and cause dam-
age.
3. Ensure that the lever on top of the pump is flush with the
handle (horizontal).
4. Install the air pump on the fitting in the air manifold.
5. Pull the lever up (vertical) to lock the pump onto the fitting.
6. Pump air into the system until both green indicators extend
and water drains from each opening in the engine.
7. Immediately remove the blue drain plug from the side of the
heat exchanger.
8. This must be removed within 30 seconds.
9. Allow the system to drain for a minimum of five (5) minutes.
10. Add air as necessary to keep the green indicators extended.
11. Crank the engine over with the starter motor to purge any
water trapped in the seawater pump.
12. Do not allow the engine to start.
13. Reinstall the blue plug in the heat exchanger.
14. Remove the air pump from the air manifold and place in bracket.
15. If air activated System fails use all blue plugs to drain the engine.
16. Remove end caps, washer and gasket from the heat exchanger.
17. To ensure that all water is drained leave the drain system open
while transporting.

Figure 4-16

Warning: Do not drain anti freeze from
the closed cooling system drain plugs.
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Storage And Commissioning
Figure 4-17
Exchanger
Remove the end caps to manually
drain the system
Figure 4-14
Port Drain
Figure 4-15
Starboard
Figure 4-18
Figure 4-13
Heat
Gasket
Washer
End Cap
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