Page 123 - REPOWER REFERENCE GUIDE (2020)

Cooling System
Seawater Strainer

A seawater strainer is recommended if the boat is to be operated in an area with a high debris content. The strainer must be
large enough to ensure an adequate supply of water to cool the engine. Install the seawater strainer in an area where it will be
easily accessible for inspection and cleaning. The strainer should be installed in the water inlet hose after the seacock (water
inlet valve) to allow the operator to shut off the water when cleaning the strainer. If boat is not equipped with a seacock, the
strainer should be located above the waterline to prevent water from entering the boat during service. The strainer must allow
draining under freezing temperatures.

7533

Typical seawater strainer
Seawater Supply System—Inboard

Specifications

NOTE: Refer to the Mercury MerCruiser Inboard Applications manual for details on the seawater inlet restriction test.
Seawater Supply Hose

Seawater Supply Hose Specifications
Seawater inlet hose 32 mm (1‑1/4 in.) I.D. (wire reinforced)
Seawater pickup
Seacock (optional) Low restriction with 32 mm (1‑1/4 in.) connections
Seawater strainer (optional)
Seawater Inlet

Seawater Inlet Specifications
Collect data at the seawater pump inlet (vacuum)
Maximum water inlet restriction 34 kPa (10 in. Hg)

90-8M0149179 eng NOVEMBER 2018 © 2019 Mercury Marine Page 4E-11