Chris-Craft 2015 21 Carina Owner's Manual page 148

Closed Cooling Drain And Winterization
Draining the seawater system
Use a suitable receptacle while draining.
Open the drain nipple (1) by carefully screwing the
nipple. Use a number 17 block spanner if the nipple
sticks. Drain all coolant and screw in the nipple by
hand.
Move the hose and then continue to drain the coolant
from the drain nipple (2) and (3)
Fig 4-23. Closed Cooling Drain Points
Note: Ensure that the
petcock (#3) is closed
before starting the engine.
Warning: Do not drain anti freeze from
the closed cooling system drain plugs.
4-28
Storage And Commissioning
Fig 4-25. Volvo D3 Diesel
Cleaning the seawater filter.
Warning! Risk for water penetration
Screw off the cover (1) and remove the
seal plate (2).
Lift out and clean the insert (3).
Important!
If the boat is used in water that has a lot
of contaminants, seaweed, etc. the filter
must be checked more frequently than
indicated in the maintenance schedule.
Otherwise there is a risk that the filter will
clog and the engine will overheat.
Fig 4-24.
Sea
Strainer
Fig 4-26.
Sea
Strainer
Location
4-28