RAW
WATER
PUMP
IMPELLER
DESCRIPTION
Coolant (freshwater) 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 0-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 and with a drift,
press tlie shaft and bearing assembly out
of
the pulley end
of
the pump.
6. Remove the
0-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.
26
INSPECTION:
CHECK
AT
THE
BASE
OF
EACH
BLADE
BY
BENDING
VIGOROUSLY.
REPLACE
THE
IMPELLER
IF
THERE
ARE
ANY
CRACKS.
INSPECT
THE
0-RING
AND
IMPELLER.
REPLACE
IF
ANY
SIGNS
OF
WEAR
OR
TEARING
DUST
PLATE.
LIGHTLY
GREASE
THE
PUMP
CHAMBER
WITH
GLYCERIN
PULLEY
CIRCLIP
A
IMPELLER
PIN
FITS
INTO
SHAFT
SHAFT
O·RING
INNER
BEARING
SPACER
OUTER
BEARING
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