Sea Strainer; Seawater Supply Test; Seawater Inlet Restriction Test - Mercury MerCruiser Product Applications Manual

Cooling System

Sea Strainer

A sea strainer is recommended if the boat is to be operated in an area with a high debris
content. The strainer must be sized to minimize restriction (See Specifications) and to
provide a reasonable service interval. Locate the strainer in an area that will be easily
accessible for servicing. If the boat is not equipped with a seacock, the strainer should be
located above the seawater-line to prevent seawater entry into boat when servicing. The
strainer must have provision to allow draining in freezing temperature periods.

Seawater Supply Test

Seawater Inlet Restriction Test

Maximum seawater inlet restriction must not exceed 17 kPa (2.5 psi) when measured at
the inlet side of the seawater pump. Pressure can be tested using pressure gauge and
hardware. Gauge must be capable of accurately reading a vacuum (below atmospheric
pressure).
1. Install an adapter into the seawater inlet hose at the seawater pump to allow the
connection of a pressure gauge.
b
Brass seawater pump
Page 7A-8
Typical Sea Strainer
c
a - Connection for the pressure gauge
b - Adapter
7533
c
Composite seawater pump
c - Seawater pump inlet connection
90-863758060 AUGUST 2006
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