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Section 2.1 Injector Unit Pump
All MBE 900 engines are water-cooled, four-stroke,
direct-injection diesel engines. The cylinders are arranged in line
on both the 6-cylinder and 4-cylinder models. Each has a separate
fuel injection pump (unit pump) with a short injection line to the
injection nozzle, which is located in the center of the combustion
chamber. The unit pumps are attached to the engine block and are
driven from the camshaft. Each cylinder has two intake valves and
one exhaust valve.
Section 2.1.1 Injector Unit Pump Removal
Remove injector unit pump as follows:
1. Remove the engine trim panel. See Figure "Engine Trim Panel
Removal" .
Figure 1. Engine Trim Panel Removal
2. Remove the end cover from the lower right side of the
flywheel housing, then attach the engine barring tool J 46392.
3. Remove the fuel injection line. Refer to "2.2.1 Removal Of
High Pressure Fuel Lines And Transfer Tubes" .
4. Disconnect the engine wiring harness from each injector unit
pump to be removed. See Figure "Injector Unit Pump
Removal/Installation" .
1. Engine Trim Panel 2. Injection Lines
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Figure 2. Injector Unit Pump Removal/Installation
5. Carefully loosen the injector unit pump mounting bolts. 6.
Check the spring tension on the injector unit pump by pushing down
on it. If you cannot push
down on the injector pump manually, the spring tension is at the
maximum. You must decrease the spring tension on the injector pump
before removing it.
7. If the spring tension on the injector pump is at the maximum,
go to the next step to reduce it;
1. Injector Unit Pump 5. Mounting Bolt
2. Black O-ring (large O-ring on shaft) 6. Injection Line
3. Green O-ring (small O-ring on shaft) 7. Engine Wiring
Harness
4. O-ring (on head)
PERSONAL INJURY
To avoid injury from an ejected injector unit pump, do not
completely loosen the mounting bolts until you have tested the
spring tension. If the spring tension is at maximum and you remove
the mounting cap screws, the pump will be ejected from the engine
crankcase.
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otherwise, go to step 9 for removing the mounting bolts. 8.
Using the barring tool, rotate the crankshaft until the spring
tension decreases enough to push the
injector pump down manually. 9. Remove the mounting bolts from
the injector unit pump.
10. Using the barring tool, rotate the crankshaft until the
camshaft lifts the injector unit pump. See Figure "Injector Unit
Pump Removal" .
Figure 3. Injector Unit Pump Removal
11. If the injector unit pump doesn't come out easily, use the
injector/unit pump puller J 46375 to remove it.
a. Thread the impact extractor onto the top of the injector unit
pump, where the injection line was installed.
b. Pull the injector unit pump out by using the slide hammer on
the impact extractor. Do not use excessive force that could damage
the threads on the injector unit pump fuel line connection.
12. Check the injector unit pump for wear or damage. If any is
found, replace the entire component. The injector unit pump is not
serviceable, except for the O-rings.
Note: Replace all three O-rings.
13. Remove and discard all three O-rings: two on the injector
unit pump shaft, and one on the injector pump head. See Figure
"Injector Unit Pump Removal/Installation" .
14. Repeat this procedure for each injector unit pump that needs
to be removed.
Section 2.1.2
1. Injector Unit Pump 3. Camshaft
2. Mounting Bolts 4. Fuel Line Connection
NOTICE:
If the injector unit pump doesn't come out easily, do not try to
pry it out. This will damage it. Use the special impact extractor
to remove it.
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Injector Unit Pump Installation
Install the injector unit pump as follows:
1. Install a new pump head O-ring on the injector unit pump
head, as removed. 2. Lubricate the injector unit pump bore in the
cylinder block with grease. 3. Lubricate the new pump shaft O-rings
with grease. 4. Install the black O-ring on the injector unit pump
shaft. See Figure "Black O-ring Installation" .
Figure 4. Black O-ring Installation
a. Insert the O-Ring installer J 46382 over the injector pump
shaft, leaving only the first groove in the shaft exposed.
b. Slide the black O-ring (it is the larger of the two) over the
installer and onto the first groove in the injector pump shaft.
5. Install the green O-ring on the injector unit pump shaft. See
Figure "Green O-ring Installation " .
1. Black O-ring 3. Head of Injector Unit Pump
2. Seat for Black O-ring
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Figure 5. Green O-ring Installation
a. Back the O-ring installer out over the injector pump shaft,
leaving the second groove in the shaft exposed.
b. Slide the green O-ring (it is the smaller of the two) over
the installer and onto the second groove in the injector pump
shaft.
6. Insert the injector unit pump into the mounting hole on the
crankcase. Use the bolt mounting holes on the engine as a guide for
positioning the injector pump. Push the injector pump in by hand.
If it won't go in easily, rotate the crankshaft until the pump goes
in easily.
7. Install the mounting bolts, and tighten 65 Nm (48 lbft). 8.
Connect the fuel injection line. Refer to "2.2.2 Installation of
High Pressure Fuel Line" . 9. Repeat this procedure for each
injector unit pump, as removed.
10. Connect the engine wiring harness to each injector unit
pump. 11. Prime the fuel system. 12. Start the engine and check for
leaks. Tighten connections as needed. 13. Install the engine trim
panel. See Figure "Engine Trim Panel Installation" .
1. Green O-ring 3. Black O-ring (installed)
2. Seat for Green O-ring 4. Head of Injector Unit Pump
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Figure 6. Engine Trim Panel Installation
Copyright 2015 by Detroit Diesel Corporation. All rights
reserved.
1. Engine Trim Panel 2. Injection Lines
EPA04 MBE 900 Workshop Manual (DDC-SVC-MAN-0024) Printed Sat Jan
04 22:20:22 2014
Generated on 05-04-2015
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