Northern Lights OM150C12 Operator's Manual - page 23
OM150C12 11/11
21
Servicing
Reproduced by permission of Deere & Company, c2007. Deere & Company.
All rights reserved.
RG15325, RG15326, & RG15327
Figure 18, A. B & C
On All Engines:
NOTE: The heat exchanger core may be removed
from hoursing when either end is removed. It is
strongly recommended that both end caps be removed
for clenaing when cleaning the heat exchanger core.
5. Thoroughly clean all buildup from both end caps and
inspect zinc plug in each. Replace plugs as needed.
(See Check Zincs in 250 Hour section, p14)
6. Use a 4.76 mm (3/16”) diameter rod to clean out any
buildup in each heat exchanger tube. Run the rod
the entire length of each tube to push debris out.
Reproduced by permission of Deere & Company, c1992. Deere & Company.
All rights reserved.
RG6066
Figure 19
7. Flush the heat exchanger tubes with clean water,
making sure all tubes are cleared of debris. Clean
(with brass rod) and flush heat exchanger again if
necessary to remove any remaining debris from
tubes.
If you suspect that your heat exchanger core is
defective, have your authorized servicing dealer or
engine distributor pressure test for leaks. Replace
heat exchanger core as required.
8. Remove and thoroughly clean water manifold/heat
exchanger hoursing if needed.
Re-assembly
1. Insert two O-rings into the front and rear end caps.
2. Lubricate ends of tube bundle lightly with clean
multi-purpose grease.
SP16. FLUSHING THE COOLING SYSTEM
(CONTINUED)
1. Flush the cooling system and check for leaks and
blockage every 2000 hours. The engine must be
stopped and cold.
2. Close the seacock.
3. Remove the pressure cap from the expansion tank
with caution. If applicable, open the cooling system
air vent on top of turbocharger.
4. Open the drains on the exhaust manifold and engine
block. Drain the fresh water system (see Component
Locations, pages 4 - 5).
5. For vessels with keel cooling, the vessel must be out
of the water to allow draining of the keel cooler.
6. With drains open, pour clean water into the expansion
tank. When the water from drain is clear and free from
discoloration and sediment, close that drain. When all
drains are closed, flushing is complete.
7. Fill the fresh water system by pouring the
recommended coolant mixture as described in
previous sections.
8. Close cooling system air vent on turbocharger.
9. Open the seacock.
10. Start the engine. Check hoses and connections and
repair any leakage.
SP17. HEAT EXCHANGER SERVICE
Remove, Inspect & Clean Engine Heat Exchanger Core.
IMPORTANT: Initially remove and inspect the engine
heat exchanger core at 250 hour or three month
service interval on a new engine. Then, remove and
clean at every 500 hour or 12 month interval thereafter
1. Close sea cocks and drain the sea water system.
2. Open drain cock on cylinder block and drain
approximately two gallons of engine coolant into a
clean container. Close drain cock.
3. Loosen hose clamps. Remove end cap mounting
cam screws and remove rear end cap (Fig 17-A).
4. Remove end cap mounting cap screws and remove
front end cap (Fig, 18, B). Remove heat exchanger
core (Fig 18, C) from rear of heat exchanger.
Figure 17