Kohler 40-150EOZDJ

TP-6862 6/1414 Section 3 Cooling System
Do not use a speed scoop or cup design intake
through-hull strainer because it can cause a ramming
effect and force water upward, past the seawater pump,
and into the engine cylinders when the vessel is moving
and the generator set is shut down.
Do not use hull designs incorporating sea chests or
other designs that provide a positive pressure to the raw
water pump for the intake through-hull strainers.
Positive pressure forces water past the raw water pump
and into the engine. A sea chest is a concave
molded-in-the-hull chamber that aligns to the direction
of travel. A sea chest configuration applies a positive
pressure similar to a scoop-type through-hull strainer.
3.2.2 Seacock
Mount the seacock to the hull, assemble it to the intake,
and ensure that it is accessible for operation. Figure 3-2
shows a typical installation.
Avoid overcaulking the seacock. Excess caulk reduces
water flow and, in some cases, develops a barrier that
can force water upward, past the seawater pump, and
into the engine cylinders when the vessel is moving and
the generator set is shut down.
3.2.3 Seawater Strainer
123
5982--3.3
1. Seawater pump
2. Seawater strainer
3. Seacock
Figure 3-4 Seawater Strainer
Mount the seawater strainer to the seacock or
permanent structure at a point not higher than the
seawater pump. Ensure that the strainer is accessible
for service. See Figure 3-4 for a typical installation.
Some seawater strainers include a seacock and an
intake through-hull strainer.
Maximum seawater inlet p ressure at the seawater pump
is 34.5 kPa (5 psi). Excessive pressure will cause water
ingestion.
3.2.4 Water Lines
Water lines from the seacock to the engine-driven
seawater pump are usually constructed of flexible hose.
Connect a flexible section of hose to the seawater pump
to allow for vibrational motion of the generator set during
operation. Support a nonflexible water line within
102 mm (4 in.) of its connection to the flexible section.
Keep the seawater hose as straight and short as
possible. If the hose is too long, usually over 4.6 m
(15 ft.), water suction problems may occur. See
Section 7 for the inlet water line hose size and the
seawater connection to the seawater pump inlet. Avoid
running the inlet pipe above the generator. See
Figure 3-5 for the seawater inlet connection.
1
ADV8500A-
1. Seawater pump
2. Seawater inlet (opposite s ide)
2
Figure 3-5 Seawater Inlet Connection (Located on
non-service side), Typical
3.2.5 Closed Heat Exchanger
A closed heat exchanger is the best cooling method for
most applications. See Figure 3-6 for a typical
installation. Provide space to access the water-cooled
exhaust manifold pressure cap.