Generic TR 125 - 9 Lubricating System; Preparatory Data; Fault Diagnosis

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IX Lubricating System
Preparatory data--------9.1
Fault diagnosis---------9.2
Oil engine pump-------9.3
9.1 Preparatory Data
Function of lubricating system:
Function of engine lubricating system is to supply lubricating oil to friction surfaces of engine
parts so that dry surface friction will turn to liquid friction between plasmids of lubricating oil. It
is used to reduce wear of component, cool components of higher heat, absorb impact from
bearing and other parts, weaken noise, increase tightness between piston ring and cylinder wall,
clean and take away impurities from surface of component, etc.
Precautions on Operation
When engine oil pump is removed, clean carefully all the components and purge them with high-pressure gas.
During engine oil pump removal and installation, pay attention not to drop anything into the crankcase.
Table of standard values of baseline projects and allowable limit
Item Standard Service Limit
Engine oil capacity
Oil replacement 1L -
Engine overhaul 1.2L -
Oil pump rotor
Radial clearance between
inner and external rotors
Oil pressure pump 0.025-0.175 0.23
Oil suction pump 0.025-0.175 0.23
Clearance between external
rotor and pump block
Oil pressure pump 0.11-0.163 0.22
Oil suction pump 0.11-0.163 0.22
Clearance of rotor end face
Oil pressure pump 0.05-0.11 0.15
Oil suction pump 0.05-0.11 0.15
9.2 Fault Diagnosis
Reducing engine oil
Natural consumption
Oil leakage
Engine burnt
No oil pressure or too low oil pressure
Oil way clogged