Installation manual
RAW
WATER
PUMP
IMPELLER
DESCRIPTION
Coolant
(fresh.
water)
cooled generators have
dual
water
pumps while
the
raw
water
cooled
models
use
a single water
pump.
The pumps are essentially
the
same.
The
upper
pump
mounts
to
the
top
of the lower
pump
and
has
a
tang
on
the
shaft that
fits
into the shaft of
the
lower
pump.
Both pumps
are
driven simultaneously
by
the
engines drive belt.
The following instructions apply
to
either
pump:
PUMP
OVERHAUL
Disassembly
The pump
when
removed
from
the
engine
will
have
the
hose
attachment nipple threaded into the inlet and outlet
ports
of
the
pump
along
with
a drive pulley attached
to
the
shaft of
the
pump.
remove
these
attachments noting their positions
before starting
the
pump
disassembly.
1.
Remove
the
four cover plate
screws,
cover plate,
and
sealing
O-ring.
Dual
Pumps
Remove the cover screws
and
the cover will separate the
upper pump. (raw water) from the fresh water (coolant)
pump
as shown in the illustration.
Remove the wear plate to expose the impeller. Notice the
direction the impeller blades are working in so as to install
the replacement impeller with blades working in the same
direction.
2.
Remove
the
impeller
using
a pair of pliers, grasping
the
hub
and
pulling it out of the pump with a twisting
motion.
3. Remove
the
screw
and
sealing washer that hold
the
cam
in
place. remove the cam and inner wear
plate
behind
it.
4.
Remove
the
dust plate
and
circlip.
5.
Support
the
pump
body
on
an
arbor
press
tlnd
with
a drift,
press
the
shaft and bearing assembly out of
the
pulley
end
of
the
pump.
6.
Remove the O-ring
from
the
shaft.
7.
Support
the
outer bearing
and
push
the
shaft out of
the
bearing.
8.
Remove
the
spacer and circlip .
Inspection
Inspect
all
parts
and
replace those showing
wear
and
corrosion.
INSPECTION:
CHECK
AT
THE
BASE
OF
EACH
BLADE
BY
BENDING
VIGOROUSLY.
REPLACE
THE
IMPELLER
IF
THERE
ARE
ANY
CRACKS,
INSPECT
THE
O-RING
AND
IMPELLER.
REPLACE
IF
ANY
SIGNS
OF
WEAR
OR
TEARING
CIRCLIP
A
LIGHTLY
GREASE
THE
PUMP
CHAMBER
WITH
GLYCERIN
IMPELLER
PIN
FITS
INTO
SHAFT
SHAFT
O-RING
INNER
BEARING
SPACER
OUTER
BEARING
CIRCLIP
C
DUST
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PLATE
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PULLEY
Engines & Generators
26