Northern Lights OM150C12 Operator's Manual - page 24
22
OM150C12 11/11
Servicing
NOTE: For proper orinetation of the tube bundle, the
core divider plate must be in line with inlet end cap
divider slot with arrow pointing in the correct direction.
3. Install rear end cap (Fig 20, A) over tube bundle with
core divider plate in slot on cap.
Reproduced by permission of Deere & Company, c2007. Deere & Company.
All rights reserved.
RG15325
Figure 20
4. Fasten rear end cap and core to tank. Align core
divider vertically with stamped note indicating “This
Side Up.” (Core shown separated from cap for illus-
tration purposes.)
5. Fasten rear end cap and core to tank with bolts and
washers. Tighten bolts to 24
+/-
3 N•m (18
+/-
2 lb/ft).
6. Install front end cab (Fig 21, B) over core and bolt
to tank. Ensure core holes are aligned with heat
exchanger tank holes. Tighten bolts to 24
+/-
3 N•m
(18
+/-
2 lb/ft).
Reproduced by permission of Deere & Company, c2007. Deere & Company.
All rights reserved.
RG15326
Figure 21
7. Connect all water piping and tighten hose clamps
securely. Fill cooling system with the proper amount
and concentration of ethylene-glycol base antifreese.
8. Open sea cock, start engine and check for leaks.
SP19. ZINC ANODES
1. Zincs are installed in the cooling system to protect
your engine from electrolysis. Check them faith-
fully every 250 hours. If you are in warm salt
water or where electrolysis is a known problem,
check them more often.
Heat exchanger cooled engine:
a. Drain the raw water from heat exchanger
(see Component Locations).
b. Remove zinc holders from back of the tank and
from front and port side of the heat exchanger
(see Component Locations).
Keel Cooled engines.
a. Drain expansion tank and remove zinc holder
from tank (see Component Locations).
2. Scrape or steel brush the zinc electrode clean. If
more than 50% of the electrode has eroded away,
replace it with a new one. The electrode screws out
of the holder.
3. Reinstall the zinc holders. Be sure the threads are
clean and have good metal to metal contact.
SP20. RAW WATER PUMP
Inspect And Repair Raw Water Pump
Note: M150C12 pump has a splined shaft.
1. Close sea cocks and drain raw water system.
2. Remove cover plate (Fig 22, A) from raw water
pump.
Note: Special impeller puller tool is provided with
minor and major raw water pump rebuild kits. If
tool is not available, the impeller can normally be
removed by using two pairs 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 (Fig 22, B) and shaft key (Fig 22,
C) (6068SFM50 only) from pump housing.
4. Remove O-ring (Fig 22, D).
5. Inspect cam plate (Fig 22, E) for evidence of heavy
pitting or wear. Replace as needed.