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GMC 71 Series User Manual

GMC 71 Series
112 pages
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GMC 71 Series Specifications

General IconGeneral
Engine TypeDiesel
ConfigurationInline
Fuel SystemDirect Injection
ApplicationsIndustrial, Marine, Power Generation
Fuel TypeDiesel
Cooling SystemLiquid Cooled
Cylinders6
AspirationTurbocharged
Engine Model71 Series

Summary

FOREWORD

PRINCIPLES OF OPERATION

The Diesel Principle

Explains the basic principle of diesel engine operation, converting heat to work.

The Two-Cycle Principle

Details the two-cycle engine operation, intake, and exhaust strokes.

ENGINE STANDARDIZATION

ACCESSORY ARRANGEMENT

Describes the flexible placement of standard accessories on the engine.

ENGINE MODELS

Details the nomenclature for various engine models and configurations.

GENERAL SPECIFICATIONS

TYPICAL UNIT ILLUSTRATIONS

MODEL, SERIAL AND UNIT DESIGNATIONS

Explains how unit numbers and models are stamped on engines.

OIL, WATER, AIR, AND FUEL SYSTEMS

LUBRICATING SYSTEM

Outlines the components and function of the engine's oil circulating system.

COOLING SYSTEM

Describes the two types of cooling systems used in industrial models.

AIR INTAKE SYSTEM

Details the air intake system, including the blower and its function.

FUEL SYSTEM

Illustrates the fuel supply system, emphasizing clean fuel delivery to injectors.

ALARM SYSTEM

ALARM SYSTEM

Describes the alarm system for monitoring engine conditions.

INJECTORS

INJECTORS

Explains the mounting, operation, and service of fuel injectors.

GOVERNORS

LIMITING SPEED MECHANICAL GOVERNOR

Explains the function of a governor for controlling engine speed under varying loads.

VARIABLE SPEED MECHANICAL GOVERNOR

Describes a governor that allows operator control of engine speed.

HYDRAULIC GOVERNOR

ELECTRICAL SYSTEM

STARTING SYSTEM

Outlines the components of the engine starting system.

AUTOMATIC SHUTDOWN SYSTEMS

Explains the electrical circuits for automatic engine shutdown.

COLD WEATHER STARTING

AIR HEATER

Explains the operation and components of the air heater system for cold starts.

FLUID STARTING AID

Details the fluid starting aid system for assisting engine ignition in cold weather.

POWER TAKE-OFF

POWER TRANSMISSIONS

Lists the types of power transmissions used on Series 71 industrial units.

POWER TAKE-OFF WITH SHORT SHAFT

Describes the PTO with a short shaft and its clutch mechanism.

POWER TAKE-OFF WITH DOUBLE PLATE CLUTCH

Details the PTO with a double-plate clutch for increased surface area.

POWER TAKE-OFF WITH REDUCTION GEAR ASSEMBLY

Explains the PTO with a reduction gear for specific engine applications.

TWIN ENGINE POWER TRANSFER GEAR

Illustrates the power transfer gear and clutches for twin units.

CLUTCH- MULTIPLE UNITS

Describes the clutch assembly used in multiple engine units.

OPERATION AND MAINTENANCE

OPERATING INSTRUCTIONS

Provides initial instructions for starting and operating the engine for the first time.

STARTING

Outlines routine checks and procedures for starting the engine.

STOPPING

Details the proper procedure for shutting down the engine.

LUBRICATION AND PREVENTIVE MAINTENANCE

BEFORE STARTING

Lists checks to perform before routine engine startup.

EVERY 8 HOURS

Specifies maintenance tasks required every 8 operating hours.

EVERY 50 HOURS

Details maintenance tasks required every 50 operating hours.

EVERY 100 HOURS

Lists maintenance tasks required every 100 operating hours.

EVERY 200 HOURS

Specifies maintenance tasks required every 200 operating hours.

EVERY 500 HOURS

Details maintenance tasks required every 500 operating hours.

EVERY 1000 HOURS

Lists maintenance tasks required every 1000 operating hours.

LUBRICATING OIL SPECIFICATIONS

FUEL OIL SPECIFICATIONS

ENGINE TUNE-UP PROCEDURE-SINGLE AND MULTIPLE ENGINE UNITS

TUNE-UP PROCEDURE FOR INDUSTRIAL UNITS WITH LIMITING SPEED MECHANICAL GOVERNORS

Steps for tuning up engines with limiting speed governors.

TUNE-UP PROCEDURE FOR INDUSTRIAL UNITS WITH VARIABLE SPEED MECHANICAL GOVERNORS

Steps for tuning up engines with variable speed governors.

TUNE-UP PROCEDURE FOR INDUSTRIAL UNITS WITH HYDRAULIC GOVERNORS

Steps for tuning up engines with hydraulic governors.

THROTTLE ADJUSTMENT FOR LOAD EQUALIZATION ON TWIN OR QUAD INDUSTRIAL UNITS USING VARIABLE SPEED GOVERNORS

Exhaust Valve Clearance Adjustments

Adjusts exhaust valve clearance to ensure proper engine operation.

Time Fuel Injectors

Details the procedure for timing the fuel injectors correctly.

Governor Spring Plunger Setting

Sets the governor spring plunger for proper engine power and performance.

Position Injector Control Racks

Sets injector rack positions for equal fuel distribution and load balance.

Idle Speed Adjustment

Adjusts the engine's idle speed for smooth operation.

TROUBLE SHOOTING

LOCATING A MISFIRING CYLINDER

Procedure to identify a cylinder that is not firing correctly.

CHECKING COMPRESSION PRESSURE

Steps to measure compression pressure in engine cylinders.

HARD STARTING

Identifies causes and checks for difficulty starting the engine.

NO FUEL OR INSUFFICIENT FUEL

Troubleshooting steps for fuel delivery issues.

LOW OIL PRESSURE

Identifies causes and checks for low engine oil pressure.

UNEVEN RUNNING OR FREQUENT STALLING

Troubleshooting steps for irregular engine operation.

DETONATION

Identifies causes and checks for engine detonation issues.

LACK OF POWER

Troubleshooting steps for engine power loss.

EXHAUST SMOKE ANALYSIS

Diagnosing engine problems based on exhaust smoke color.

EXCESSIVE CRANKCASE PRESSURE

Identifies causes and checks for high crankcase pressure.

ABNORMAL ENGINE COOLANT TEMPERATURES

Troubleshooting steps for high or low coolant temperatures.

HIGH LUBE OIL CONSUMPTION

Identifies causes and checks for excessive engine oil consumption.

CHECKING ELECTRICAL STARTING SYSTEM

GROUNDED SYSTEM

Checks for proper operation of the generator and regulator in a grounded system.

INSULATED SYSTEM

Checks for proper operation of the generator and regulator in an insulated system.

STORAGE CHART

PREPARATION OF UNITS FOR STORAGE

Procedures for protecting engines during storage.

INSTALLATION

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