Northern Lights OM150C12 Operator's Manual - page 25
OM150C12 11/11
23
Servicing
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 inpeller repair kit.
IMPORTANT: If the impeller has chunks of mate-
rial 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.
IMPORTANT: Petroleum based lubricants can
cause the impeller to swell, and are not recom-
mended to lubricate the impeller before installa-
tion.
7. Lubricate new impeller blades with a non-petro-
leum 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 th eimpeller onto
the shaft.
8. Using a new O-ring, (fig 22, D), install cover plate
and tighten cap screws with washers securely.
9. Install raw water pump and tighten cap screws to
73 N•m (54 lb/ft).
10. Connect raw water inlet and outlet tubes. Tighten
mounting screws evenly until secure.
11. Replace O-rings on oil tubes and install oil filter
housing and oil tubes. Tighten mounting scres to
35 N•m (26 lb/ft).
12. Open sea cocks, start engine and check pump
operation.
Remove And Install Raw Water Pump
1. Close sea cock and drain raw water system.
2. Remove four flange mount cap screws and remove
sea water inlet tube (Fig 23, A) and outlet tube (Fig
23, B.)
Reproduced by permission of Deere & Company, c2007. Deere & Company.
All rights reserved.
RG14949, RG12189, RG6243
Figure 22