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Yuchai YC4D85Z-D20 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

Table of Contents

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Yuchai YC4D85Z-D20 Specifications

General IconGeneral
Engine ModelYC4D85Z-D20
Rated Speed1500 rpm
Cooling SystemWater-cooled
AspirationTurbocharged
Engine Type4-Cylinder, In-line, Water-cooled
Starting SystemElectric start

Summary

Chapter one Engine specifications and accessories

Charter two Main installing requirements

Charter three Engine adjustments

Charter Diesel engine maintenance

Charter 6 Normal trouble and Troubleshooting

Diesel engine can not start or start difficultly

Identifies possible causes and remedies for a diesel engine failing to start or starting with difficulty.

Insufficient power output

Lists potential causes for insufficient engine power and provides corresponding troubleshooting and remedy steps.

Abnormal noise during engine operation

Details common causes of abnormal noises during engine operation and suggests remedies for each.

Exhaust with abnormal smoke color

Explains common exhaust smoke colors (black, white, blue) and their associated causes and remedies.

Too low oil pressure

Addresses issues related to low oil pressure, including possible causes like insufficient oil or clogged pipes.

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

Covers problems associated with high oil pressure, diluted oil, and excessive oil consumption, with troubleshooting steps.

Too high water outlet temperature

Provides solutions for engines experiencing overheating, including checks on cooling water and thermostat.

Engine stops by itself

Identifies reasons why an engine might stop unexpectedly, such as fuel depletion or lubrication line blockages.

Engine over-speeding (Speed rises sharply)

Offers remedies for engine over-speeding, often related to issues with the injection pump or governor.

Common trouble and troubleshooting remedies for injection pump

Lists common problems with the injection pump, such as failure to supply fuel, and provides troubleshooting steps.

Common trouble and troubleshooting remedies for governor

Details common issues with the governor, like unsteady speed or speed rising promptly, and their remedies.

Common trouble for fuel supply pump

Addresses common problems with the fuel supply pump, including wear, leaks, and clogs, with repair suggestions.

Common trouble and troubleshooting remedies for injector

Focuses on injector issues like bad atomization or insufficient fuel injection, and their troubleshooting.

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