Northern Lights M65C13, Operator'S Manual

Page: 63 / 122

Lubrication&Maintenance/2000 Hour/24 Month
RG19661,0000402 -19-09MAR13-1/1
Inspect And Repair Sea Water Pump
(4045AFM85/6068AFM85)
NOTE: Sea water pump with shaft key is illustrated.
Sea water pumps with a splined shaft follow
the same procedure
1. Close sea cocks and drain sea water system.
2. Remove cover plate (A) from sea water pump.
NOTE: Special impeller puller tool is provided with minor
and major sea water pump rebuild kits. If tool is not
available, the impeller can normally be removed
by using two pair of pliers to grip impeller vanes
on opposite sides of impeller. Rotating the pump
shaft by hand may help free the impeller. Petroleum
based lubricants can cause the impeller to swell,
and are not recommended to free a stuck impeller.
3. Remove impeller (B) and shaft key (C) (if equipped)
from pump housing.
4. Remove O-ring (D).
5. Inspect cam plate (E) for evidence of heavy pitting or
wear. Replace as needed.
6. Inspect impeller for damages such as tears, stress
cracks, excess abrasions on vane ends, or chunks
of material missing. Impellers that are run dry will
overheat and fail the impeller blades at the root.
Impellers that swell and stick, fail the impeller in
the middle of the blade. If impeller replacement is
necessary, order an impeller repair kit.
IMPORTANT: If impeller has chunks of material
missing, the heat exchanger, aftercooler,
marine gear oil cooler and any other circuit
that are cooled by raw water should be
thoroughly cleaned and flushed.
7. Install shaft key (C) (if equipped) on shaft.
IMPORTANT: Petroleum based lubricants can cause
the impeller to swell, and are not recommended
to lubricate the impeller before installation.
8. Lubricate new impeller blades with a non-petroleum
based lubricant such as silicone or soapy water.
Install impeller using a twisting motion and be sure
the impeller blades are bent in the same direction as
they were upon removal to prevent damage at startup.
Rotate impeller on shaft to align keyways/splines and
slide the impeller onto the shaft.
9. Using a new O-ring (D), install cover plate and tighten
cap screws with washers securely.
10. Install sea water pump and tighten cap screws to 73
N·m (54 lb-ft).
11. Connect sea water inlet and outlet tubes. Tighten
mounting cap screws evenly until secure.
RG14949
—UN—20JUN07
Remove Cover Plate
RG12189
—UN—25FEB02
Remove and Inspect Components
RG6243
—UN—23MAR92
Inspect Sea Water Pump Impeller
A—Cover Plate
B—Impeller
C—Shaft Key D—O-Ring
E—Cam Plate
12. Replace O-rings on oil tubes and install oil filter
housing and oil tubes. Tighten mounting cap screws
to 35 N·m (26 lb-ft).
13. Open sea cocks, start engine and check pump
operation.
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