12. Fill a container with a sufficient amount of propylene glycol antifreeze and tap water, mixed to manufacturer's
recommendation to protect the engine to the lowest temperature to which it will be exposed during cold weather or
extended storage.
13. Disconnect the seawater inlet hose from the seawater pump. Using an adapter, if required, temporarily connect an
appropriate length piece of hose to the seawater pump and place the other end of the hose into the container of propylene
glycol mixture.
a - Seawater pump inlet
b - Aftercooler discharge pipe seawater drain plug (identified
with blue dot)
NOTE: Discharge of propylene glycol into the environment may be restricted by law. Dispose of propylene glycol in
accordance with federal, state, and local laws and guidelines.
14. Start the engine and operate at idle speed until the antifreeze mixture has been pumped into the engine seawater cooling
system.
15. Stop the engine.
16. Remove the temporary hose from the seawater pump.
17. Install the seawater inlet hose onto the seawater pump housing and secure the hose with a clamp. Tighten the clamp
securely. Place a tag at the helm with instructions informing the operator the seacock is closed and must be opened before
starting the engine.
Checking the Seawater Pickups
Ensure that the water inlet holes for the seawater pickup are clean and not obstructed.
Typical through-the-hull seawater pickup
a - Water inlet holes
Cleaning the Seawater Strainer
NOTICE
An open seawater strainer or seacock during some service or maintenance procedures can introduce water into the boat,
causing damage or sinking the boat. Always close the water supply from the seawater pump, water inlet, or seacock when
performing service or maintenance on the cooling system.
1. Ensure that the engine is not running.
2. Close the seacock.
3. Remove the screws, washers, and cover.
Section 5 - Maintenance
Page 64 90-8M0117076 eng FEBRUARY 2018
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