Operator`s manual
Raw
Water
Pump
The raw water pump
is
a self-bleeding, gear-driven, rotary pump with a non-ferrous housing and a
neoprene impeller. The impeller has flexible vanes which wipe against a curved cam plate within the
impeller housing, producing the pumping action.
On
no account should this pump be
run
dry. There
should always be a spare impeller and impeller cover gasket aboard (an impeller kit). Impeller failures
occur when lubricant (raw water) is not present. Such failures are not warrantable and the operator's are
cautioned to make sure raw water flow is present at start-up. Know your pump, know its location on the
engine and know how to change the impeller in it.
SCREWDRIVER
NEOPRENE
IMPELLER
CURVED CAM
SCREWORIVER
Remove the impeller with the aid
of
two small screwdrivers, as illustrated, and carefully pry the impeller
out
of
the pump. Install the impeller
by
positioning the hub pin to align with the slot in the drive shaft.
Move the blades to conform to the curved cam plate and push the impeller into the pump's housing.
Water
Pump
Drive Belt Tension
Generator models
COme
equipped with belt guards that cover over the belt(s) on the front
of
the engine.
("OUt
of
sight -out
of
mind." The belt guard
is
not installed for that purpose.) Operators are advised that
the inspection, service, and maintenance spoken
of
below should be followed.
II
WARNING
II
Never attempt to adjust the drive belt's tension while the engine
is
in operation.
II
CAUTION
II
Excessive water pump drive belt tension can cause rapid wear
of
the belt and reduce the service
life
of
the fresh water pump's bearings. Excessive slack or the presence
of
oil on the belt can
cause belt slipping, resulting in high operating temperatures.
The water pump drive belt is properly adjusted
if
the belt can be deflected no less than 3/8 inch and no
more than
112
inch (I0mm, 12mm) as the belt is depressed with the thumb at the midpoint between the
two pulleys on the longest span
of
the belt. A spare drive belt should be carried on board.
47
WESTERBEKE
GENERATORS