5. Switch off the engine.
6. Replace the cover on the seawater filter.
7. Attach a suitable hose to the seawater‑cooling system drain screw.
Heat exchanger drain screws
a - Closed‑cooling system drain screw
b - Seawater‑cooling system drain screw
8. Open the drain screw and allow the water to drain into a suitable container.
9. When the draining is complete, remove the hose and close the drain screw.
10. Be certain to open the seacock prior to boat operation.
Checking the Seawater Pickups
Verify the water inlet holes for the seawater pickup are clean and unobstructed.
Typical through-the-hull seawater pickup
Typical through-the-transom seawater pickup
a - Water inlet holes
Cleaning the Seawater Strainer, if Equipped
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. With the engine off, close the seacock, if equipped, or remove and plug the seawater inlet hose.
2. Remove the screws, washers, and cover.
3. Remove the strainer, drain plug, and sealing washer.
4. Clean all the debris from the strainer housing. Flush both the strainer and housing with clean water.
5. Check the cover gasket and replace when damaged or if it leaks.
6. Reinstall the strainer, drain plug, and sealing washer.
a
a
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Section 4 - Maintenance
90-8M0133568 eng JUNE 2017 Page 49
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