Yuchai YC4D60-D21 User Manual

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YC4D60-D21 /YC4D85Z-D20
YC4D60-D21 /YC4D85Z-D20 SERIES DIESEL ENGINE GENERATOR
OPERATION & MAINTENANCE MANUAL
Guangxi Yuchai Machinery Co., Ltd

Yuchai YC4D60-D21 Specifications

General

Engine Model	YC4D60-D21
Cylinders	4
Compression Ratio	17.5:1
Max Power Output	60 kW
Rated Speed	1500 rpm
Starting System	Electric Start
Lubrication System	Pressure and splash lubrication
Fuel System	Direct Injection
Aspiration	Naturally aspirated
Engine Type	4-stroke, water-cooled, direct injection
Cooling System	Water-cooled
Weight	400 kg

Summary

Technical data of adjustment and control for engine

Tightening torques of the connecting screw thread

Main parts fit clearances

Charter two Main installing requirements

Installation of the camshaft

Installation of the valves and valve guides

Installation of the injectors

Installation of the cylinder head

Installation of the gear train

Charter three Engine adjustments

Adjustment of the valve clearance

Fuel injection pressure adjustment

Oil pressure adjustment

Operation of diesel engine

Preparations before starting the diesel engine

Starting the diesel engine

Operating the diesel engine

Stopping the diesel engine

Charter Diesel engine maintenance

Requirements of technical maintenance

Maintenance methods

Charter 6 Normal trouble and Troubleshooting

Diesel engine can not start or start difficultly

Lists causes and remedies for engine starting issues.

Insufficient power output

Cylinder gasket damage or leakage

Turbocharger is out of order

Abnormal noise during engine operation

Exhaust with abnormal smoke color

Too low oil pressure

Too high oil pressure, much diluted oil, excessive oil consumption

Too high water outlet temperature

Engine stops by itself

Engine over-speeding (Speed rises sharply)

Common trouble and troubleshooting remedies for injection pump

Injection failure

Lists common injection failures and their remedies, including oil issues and worn parts.

Insufficient or uneven outlet oil

Addresses fuel pump issues with insufficient or uneven outlet oil and solutions.

Common trouble and troubleshooting remedies for governor

Unsteady speed (engine hunting)

Covers causes for unsteady engine speed (hunting) and corresponding remedies.

Speed always lower than calibrated speed.

Provides remedies for engine speed consistently lower than calibrated speed.

Speed rising promptly to abnormal state(runaway)

Common trouble for fuel supply pump

Common trouble and troubleshooting remedies for injector

Bad atomization of injector and insufficient or without fuel injection

Low injection pressure

Injector oil leak