Onan MGKBC Series, Руководство по установке

Страница: 16 / 32

7
SYSTEM COMPONENTS
Raw Water Pump
The raw water pump can work against a maximum
lift (suction) of 48 inches (122 cm) WC to deliver the
required flow of cooling water. Lift is a combination
of the actual vertical lift and the resistance to flow
cause by the hose, strainer, sea cock and through-
hull fitting.
The pump impeller must be wetted with water to es-
tablish initial pump lubrication and suction. See the
Operator’s Manual.
Raw Water Hose
The 5/8 inch (15.9 mm) hose barb for raw water
pickup is mounted on the drip pan on the right side
(Page 23). Use SAE 20R3 or equivalent hose to
supply raw water to the genset. The hose must be
able to resist a slight vacuum.
Sea Water Strainer
The sea water strainer should have a 5/8 inch
(15.9 mm) inlet. It should be located below the level
of the raw water pump (Page 23) and as close as
possible to the genset. The basket must be remove-
able for cleaning.
Sea Cock
Install a bronze, full-flow sea cock on the through-
hull fitting.
Through-Hull Fitting and Strainer
The through-hull fitting should have a 5/8 inch (15.9
mm) inlet and be as close to the genset as possible.
If the strainer has slotted openings, the slots must
be parallel to the keel for best flow when the boat is
under way. Also, stagger the through-hull fittings
along the keel so that downstream fittings are not
starved.
CAUTION
Do not use a scoop-type through-
hull fitting. A forward-facing scoop can develop
enough ram pressure to flood the engine. A
rear-facing scoop can develop enough suction
to impede flow.
Siphon Break
Conduct the RAW WATER PICKUP TEST to deter-
mine whether a siphon break is required to prevent
the engine from being flooded with floatation water.
Siphon Break Kit 541-0876 is available if a siphon
break is required. Carefully follow the instructions in
the kit. The hoses in the kit replace the hose be-
tween the engine heat exchanger and exhaust-wa-
ter mixer (Figure 1). The end panel of the genset
has knockouts for the hoses to pass through
(Page 23). The kit has the hole grommets. Fig-
ures 4 and 5 illustrate typical siphon break installa-
tions.
CAUTION
Engine damage due to flooding as a
result of failing to install a required siphon break
is not covered by Warranty.
Coolant Recovery Tank
The genset is shipped with a coolant recovery tank
kit. Follow the instructions in the kit.
The tank must
be accessible for daily inspection and refilling.
Clamp the recovery hose to the hose barb on the
coolant fill neck (Figure 1). Route the tank recovery
and overflow hoses through the holes in the end of
the enclosure (Page 23). Make sure the overflow
hose terminates in the drip pan where it will not
splash coolant on electrical components. Fill the
tank in accordance with the Operator’s Manual.
Initial Coolant Fill
The genset is normally shipped from the factory with
coolant, unless prohibited by shipping regulations.
Fill the system, if necessary, in accordance with the
Operator’s Manual.
CAUTION
Engine damage due to running the
engine without coolant is not covered by War-
ranty.
Redistribution or publication of this document,
by any means, is strictly prohibited.