Maintenance Manual of 4M11 Series Diesel Engine For Land Power Generators
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② Disassemble the connecting nuts between high pressure fuel pipe and various cylinders of fuel
injection pump in turn.
4.7.3.3 Inspection and Maintenance of High-pressure Oil Pipe
①Observe the external surface of high pressure fuel pipe for presence of cracking and leakage. If yes, replace
high pressure fuel pipe and feed back as per corresponding procedure.
②Observe the connector cones on two ends of high pressure fuel pipe and ensure the intactness.
4.7.3.4 High-pressure Oil Pipe Assembly Procedures
The assembly procedures are in the reverse order of the disassembly procedures. However, notice to
keep the high pressure fuel pipe clean and intact.
4.7.4 Disassembly, Inspection, Repair, and Assembly of Fuel Injector
4.7.4.1 Exploded View for Assembly of Fuel Injector
Figure 4-57 Exploded View for Assembly of Fuel Injector
4.7.4.2 Fuel Injector DisassemblyProcedures
①Disassemble the connecting hollow bolts between fuel injectors of various cylinders and fuel
injector fuel return pipe.
②Disassemble the compression bolts of fuel injectors and take out the fuel injector pressure plate.
③Disassemble the fuel injectors by special tool.
4.7.4.3 Inspection and Maintenance of Fuel Injector
①Check the copper seal washer. Upon detection of excessive deformation or other damage, replace
it and at the same time clean the surfaces of fuel injector seat holes to disassemble carbon
Gland bolt
Spherical
washer
Hollow bolt
Fuel injector
Fuel injector pressure
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