TP-6277 10/0344 Installation
6.5 Cooling System
Design the marine generator set cooling system to
include the following features.
6.5.1 Intake Through-Hull Strainer
(Seacock Cover)
Install a screened intake through-hull strainer to prevent
entry of foreign objects. Use perforated, slotted-hole, or
unrestricted-hole design strainers. See F igure 6-8 for
examples of typical strainers. The inner diameter of the
strainer opening must be equal to or greater than the
inner diameter of the waterline hose to the seawater
pump.
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2
3
4
5
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1. Inside packing
2. Outside packing
3. Seacock cover
4. Direction of vessel movement
5. Typical intake through-hull strainers
Figure 6-8 Seacock Installation
Do not align the strainer (in relation to the direction of
travel) with any other through-hull intakes. See
Figure 6-9. Flush mount the recommended
through-hull strainer. Install slotted-hole design
strainers with the slots parallel to the direction of the
vessel’s movement.
Note: Position the intakes in relation to the vessel’s
travel so neither is in the wake of the other.
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2
4 3
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1. Generator set intake
2. Intake
3. Aft (rearward)
4. Fore (forward)
Figure 6-9 Intake Strainer
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 s ea chests or
other designs that provide a positive pressure to the raw
water pump for the intake through-hull strainers. A
positive pressure will force water past the raw water
pump and into the engine. A s ea 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.
6.5.2 Seacock
Mount the seacock to the hull, assemble it to the intake,
and ensure that it is accessible for operation. Figure 6-8
shows a typical seacock 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.
6.5.3 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 6-10 for a typical installation.
The optional Kohler seawater strainer is threaded for
1/2 NPT fittings.
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