S50MC-C Fuel Pump 909-4.
2
Dismantling
207
Fuel Pump S50MC-C
Dismantling
909-4.2
2.
Note!
Before dismantling any part of the fuel
pump, make sure that the pump has
been relieved of pressure and that all oil
has been drained off.
1. Dismantle the fuel pump top cover/plunger
barrel assembly.
See Procedure 909-5.2.
2. Remove the fuel oil inlet pipe between the
fuel pump and the fuel oil inlet valve.
Discard the gaskets.
3. Remove the nuts at the base of the fuel
GN909-4.2 207 02
pump.
Mount the lifting tool and lift the fuel pump
housing away. See Data D-3.
3.
Note!
Take care not to damage the threads of
the studs.
Land the fuel pump on wooden planks.
GN909-4.2 207 03
When referring to this page, please quote Procedure 909-4.2 Edition 207 Page 1 (5)
MAN B&W Diesel A/S
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909-4.3 Fuel Pump S50MC-C
Overhaul
Overhaul
909-4.3
1. 1. Tilt the fuel pump housing into a horizontal
position on the wooden planks.
2. Remove the bottom plate from the fuel
pump housing.
If the bottom plate sticks, loosen it by
screwing two M10x70 mm screws into the
threaded holes of the bottom plate.
3. Dismantle the:
• Fuel oil index arm.
GN909-4.3 207 01
• Regulating guide.
2.
GN909-4.3 207 02
3.
GN909-4.3 207 03
Page 2 (5) When referring to this page, please quote Procedure 909-4.3 Edition 207
MAN B&W Diesel A/S
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S50MC-C Fuel Pump 909-4.3
Overhaul
4. Dismantle and inspect the erosion plugs on 4.
both sides of the fuel pump housing.
If heavily eroded, replace the erosion plugs.
5. Clean all the parts in diesel oil or kerosene.
Blow dry with compressed air.
Warning!
Always use eye protection when working
with compressed air.
GN909-4.3 204 04
6. Mount a new sealing ring in the pointer for
the fuel oil index arm.
Note! 6.
Soak the sealing ring in lubricating oil
before mounting.
7. Clean all inside surfaces of the fuel pump
housing.
HC909-3.4 121 11
When referring to this page, please quote Procedure 909-4.3 Edition 207 Page 3 (5)
MAN B&W Diesel A/S
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909-4.3 Fuel Pump S50MC-C
Overhaul
9. 8. Lubricate the following with molybdenum
disulphide grease (MoS2):
• All internal surfaces of the fuel pump
housing.
• The sliding surfaces of all the parts of the
regulating system.
• The teeth of the:
– Regulating guide.
– Fuel index arm.
GN909-4.3 207 09
9. Mount the fuel oil index arm.
Adjust the position of the fuel oil index arm
so that the scratch mark on the fuel oil in-
dex arm is aligned with the centre of the
10. fuel pump housing.
Mount the fuel oil index pointer.
10. Mount the regulating guide in the fuel pump
housing, ensuring that the scratch mark on
the regulating guide is aligned with the
scratch mark on the fuel oil index arm.
11. Mount the bottom plate on the fuel pump
housing.
GN909-4.3 207 10
11.
GN909-4.3 207 11
Page 4 (5) When referring to this page, please quote Procedure 909-4.3 Edition 207
MAN B&W Diesel A/S
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S50MC-C Fuel Pump 909-4.4
Mounting
Mounting
909-4.4
1.
Note!
Before mounting the fuel pump housing,
make sure that all sliding faces and
threads are cleaned and lubricated with
molybdenum disulphide grease (MoS 2).
See Procedure 913-11. D-1
1. Lower the fuel pump housing on to the D-2
pump base, taking care not to damage the
threads of the studs.
Remove the lifting tool.
Mount and tighten the nuts at the base of
the fuel pump housing. See Data D-1, D-2.
2. Mount the fuel oil inlet pipe between the
fuel pump and the fuel inlet valve.
GN909-4.4 207 02
3. Mount the fuel pump top cover/plunger-bar-
rel assembly.
See Procedure 909-5.4.
2.
GN909-4.4 207 03
When referring to this page, please quote Procedure 909-4.4 Edition 207 Page 5 (5)
MAN B&W Diesel A/S
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