CUMMINS N14 User Manual

Explains the purpose and structure of the troubleshooting and repair manual.

Provides definitions for technical terms used in the manual.

Details procedures for cleaning engine parts using various methods like solvent, steam, and bead blasting.

Outlines general practices and precautions for engine repair, emphasizing safety and genuine parts.

Lists critical safety precautions and warnings to be followed before performing any repair work.

Explains the purpose and nature of illustrations used in the manual, noting they may be generic.

Defines the various symbols used in the manual to convey instructions and warnings.

Explains how the Cummins model name provides engine information.

Details the location and importance of the engine dataplate for identifying specific engine information.

Provides diagrams showing component locations, filter points, and access for instrumentation and controls.

Lists detailed specifications for various engine systems like air induction, cooling, and lubrication.

Explains the location and purpose of fuel pump dataplate information for calibration.

Outlines general procedures and techniques for effective troubleshooting, emphasizing thorough analysis.

Introduces symptom charts designed to aid in diagnosing specific engine problems by following logical steps.

Further steps for gradual overheating, checking radiator cap, antifreeze concentration, and temperature gauges.

Further steps for gradual overheating, including thermostat, radiator shutters, water pump, and air/combustion gases.

Continues troubleshooting for sudden overheating, examining thermostat, air/combustion gases, and water pump functionality.

Continues troubleshooting poor acceleration, checking sensors, throttle linkage, vehicle parasitics, and air leaks.

Further steps for poor acceleration, checking Compuchek tests, AFC signal lines, and fuel supply restrictions.

Continues troubleshooting low power engine brake issues, examining piston adjustments and solenoid valve seals.

Continues troubleshooting no-start conditions without smoke, checking fuel lines, fuel pump rotation, and injector issues.

Continues troubleshooting slow deceleration in PT fuel systems, checking Compuchek tests and injector seating.

Continues troubleshooting no-start conditions with smoke, checking fuel contamination, valve adjustment, and injector issues.

Continues the engine noise troubleshooting, checking valve/injector clearance, injection timing, and vibration damper.

Further steps for engine noise diagnosis, checking drive train backlash, main/connecting rod bearings, and flywheel issues.

Continues basic troubleshooting for low power, checking fuel pump, air filter, and throttle linkage.

Further steps for low power issues, checking CAC plumbing, fuel grade, tachometer, and AFC plunger.

Addresses low power issues specific to industrial, electric drive, and mechanical drive applications.

Continues application-specific low power troubleshooting for genset applications, checking sensors and fuel/air delivery.

Further application-specific low power troubleshooting for marine applications, checking governor and propeller shaft.

Guides on analyzing performance data to diagnose low engine power output, checking intake and fuel system restrictions.

Continues performance measurement for low power, checking fuel rates, pressures, and brake adjustments.

Continues troubleshooting rough idle issues, checking fuel grade, engine brake settings, and overhead adjustments.

Final steps for rough idle diagnosis, checking CELECT™ injector malfunction and internal engine damage.

Continues troubleshooting rough running or misfires, checking engine brakes, overhead adjustments, and injection timing.

Continues troubleshooting unexpected engine shutdown, checking injector malfunction.

Continues troubleshooting low idle speed surges, checking governor settings and fuel inlet/drain line restrictions.

Covers PT, PT PACER, and CELECT™ systems for engine speed surge troubleshooting.

Final steps for speed surge troubleshooting, covering Genset and Industrial applications with EFC control.

Continues engine vibration troubleshooting, checking flywheel, power components, and gear backlash.

Continues troubleshooting slow cranking with air start, checking starting motor malfunction.

Continues electric start slow cranking troubleshooting, checking starting circuit components and pinion/gear damage.

Continues troubleshooting engines that start but won't keep running, checking intake/exhaust restrictions and fuel pump delivery.

Continues troubleshooting excessive fuel consumption, checking fault codes, speedometer, and fuel/air delivery.

Guides on analyzing performance test data for excessive fuel consumption, checking intake air restriction and fuel plumbing.

Final steps for fuel consumption performance test evaluation, checking overhead adjustments and STC operation.

Continues troubleshooting oil consumption, checking STC valve, air compressor oil pumping, and turbocharger seals.

Details troubleshooting steps for low lubricating oil pressure, checking oil level, external leaks, and viscosity sensors.

Addresses excessive oil sludge in the crankcase, checking oil supply, fuel grade, and injection timing.

Continues black smoke troubleshooting, checking turbocharger wheel clearance and fuel quality.

Guides analysis of performance data for excessive black smoke, checking fuel drain line restrictions and injector conditions.

Continues performance measurements for black smoke, checking fuel rates, pressures, and overhead adjustments.

Continues white smoke troubleshooting, checking STC oil delivery and injector tappets.

Final steps for white smoke troubleshooting, checking injector protrusion and cylinder compression.

Discusses engine-related causes of poor acceleration and response, such as low no-air settings and throttle linkage issues.

Provides a report form for documenting engine lubricating oil consumption.

Outlines checks for maintenance history, external leaks, and fuel pump tampering related to oil consumption.

Discusses the use and properties of antifreeze, including mixing ratios and freeze/boiling points.

Explains the need for Supplemental Coolant Additives (SCA) and proper precharging levels for cooling system protection.

Illustrates the flow of coolant through the engine, showing key components and pathways.

Provides general information about the cooling system's functions and components.

Details procedures for pressure testing the cooling system to identify leaks.

Warns against using sealing additives due to potential problems like coolant filter clogging.

Lists specialized tools recommended for performing cooling system procedures.

Advises against using soluble oils due to potential damage to cooling system components.

Lists important specifications for the cooling system, including capacity, temperature ranges, and pressure limits.

Discusses the importance of water quality for cooling system performance and potential issues from contaminants.

Provides instructions on how to safely drain the engine's cooling system.

Details procedures for removing, inspecting, and installing the fan and fan hub.

Outlines procedures for inspecting, installing, and removing fan belts.

Describes how to visually inspect the fan for damage or wear.

Explains how to inspect the fan shroud for proper clearance and damage.

Details inspection of the fan spacer and pulley for cracks or damage.

Provides step-by-step instructions for filling the engine cooling system with coolant.

Explains the primary functions of the engine cooling system.

Guides on inspecting radiator and charge air cooler fins for obstructions and damage.

Details testing and inspection procedures for the radiator pressure cap to ensure proper sealing.

Explains the operation of radiator shutters and how to check their temperature actuation.

Discusses the correct use and importance of supplemental coolant additives for engine protection.

Shows a graph illustrating thermal control settings for fan and shutter operation based on temperature.

Covers testing procedures for the thermostat, both in-chassis and out-of-chassis.

Details removal and installation procedures for the thermostat housing.

Explains inspection, removal, and cleaning of the thermostat seal.

Covers testing, removal, and installation procedures for the viscous fan clutch.

Details removal, cleaning, and inspection of the crankcase breather system.

Provides instructions for calibrating the engine oil dipstick to ensure accurate readings.

Outlines the procedure for safely draining the engine's lubricating oil.

Provides steps for filling the engine with lubricating oil and installing the oil filter.

Covers removal, cleaning, inspection, and testing of the high oil pressure relief valve.

Explains how used oil analysis can diagnose internal engine damage and wear.

Details removal and installation procedures for the lubricating oil cooler assembly.

Covers removal, cleaning, and installation of the lubricating oil filter.

Guides on checking the engine for oil leaks after operation and inspecting the crankcase breather.

Outlines procedures for removing, cleaning, inspecting, and installing the oil pan.

Details testing and installation procedures for the lubricating oil pressure gauge.

Covers removal, cleaning, inspection, installation, and testing of the lubricating oil pump.

Details removal, cleaning, inspection, and installation of the lubricating oil pump signal line.

Covers cleaning, installation, and removal of the lubricating oil pump signal line orifice.

Describes tests for the operation of the lubricating oil system, including pressure checks.

Illustrates the flow of lubricating oil through the engine systems.

Shows the flow diagram for the lubricating oil system, focusing on viscosity sensor and STC valve.

Lists specialized tools for lubricating oil system procedures.

Lists key specifications for the lubricating oil system, including pressure and capacity.

Details testing and installation procedures for the lubricating oil temperature gauge.

Covers removal, cleaning, inspection, and installation of the lubricating oil transfer tube.

Details removal, cleaning, inspection, installation, and testing of the main oil pressure regulator.

Explains the importance and procedure for priming the lubricating oil system before engine operation.

Covers removal, cleaning, inspection, installation, and testing of the viscosity sensor on STC engines.

Illustrates the flow of air through the intake system, including the turbocharger and charge air cooler.

Details methods for testing air leaks in the intake and exhaust piping, turbocharger, and CAC connections.

Covers cleaning, inspection, and checking pressure drop across the charge air cooler.

Provides an overview of the combustion air system, including intake piping, turbocharger, and CAC.

Lists specialized tools required for combustion air system maintenance.

Lists specifications for air induction and exhaust systems, including temperature rise and restrictions.

Outlines procedures for checking exhaust restriction using a manometer or gauge.

Illustrates the flow of exhaust gases through the system, including the turbocharger.

Details how to check intake air restriction using a vacuum gauge or manometer.

Covers removal, cleaning, inspection, and installation of the intake manifold.

Explains how to verify the correct turbocharger part number against the engine's CPL.

Details procedures for checking axial and radial bearing clearance in the turbocharger.

Guides on inspecting turbocharger compressor and turbine wheels for damage.

Provides comprehensive steps for removing, cleaning, inspecting, installing, and replacing the turbocharger.

Outlines methods for testing turbocharger seals for oil or fuel leaks using fluorescent tracer and black light.

Covers inspection, installation, and removal procedures for the air compressor.

Details inspection, installation, and removal of the air compressor cylinder head.

Outlines checking procedures for the air governor.

Guides on checking the air governor when the air compressor will not pump.

Addresses carbon buildup issues in the air compressor, including discharge line checks.

Illustrates flow diagrams for the compressed air system, showing loaded and unloaded modes.

Provides general information about the compressed air system components and operation.

Lists specialized tools for compressed air system maintenance.

Lists specifications for different models of air compressors, including dimensions and weight.

Provides specifications for compressor spring force, crucial for proper valve operation.

Covers checking, cleaning, inspection, installation, and removal of the compressor unloader valve.

Details how to check for gasket leaks in the air compressor system.

Details the procedure for checking the AFC no-air setting on the fuel pump.

Provides methods for testing for air in the fuel system, including suction line checks.

Guides on locating the cause of cylinder misfiring or smoking, using cylinder cutout and temperature methods.

Outlines procedures for checking fuel consumption, including customer complaint forms and checklists.

Covers installation and removal of the fuel gear pump check valve.

Details procedures for fuel pump removal, cleaning, inspection, and installation.

Addresses fuel pump drain line restrictions, checking for loops and fittings.

Covers checking fuel pump flow, rotation, and priming procedures.

Guides on checking fuel pump inlet restriction using a vacuum gauge.

Details on-engine adjustments for air actuated and VS governors, and idle speed.

Covers checking and testing the fuel pump shutoff valve.

Lists specialized tools used for fuel system maintenance and troubleshooting.

Illustrates flow diagrams for various fuel systems including STC and PT.

Provides general information on PT and STC fuel systems, including theory of operation.

Covers maintenance procedures for fuel filters, lines, and brackets.

Includes installation publications, overhead fuel tank requirements, and gauge usage.

Lists specifications for fuel system components, including idle speed and restrictions.

Provides recommendations for fuel oil properties and usage based on ambient conditions.

Details procedures for injector removal, installation, and adjustment for STC and CELECT™ engines.

Covers alternator belt adjustment and replacement procedures.

Details removal and installation of the alternator.

Outlines checking procedures for batteries, including electrolyte levels and specific gravity.

Guides on checking battery cables and connections for cracks, corrosion, or looseness.

Provides general information about the heavy-duty electrical system components.

Lists specialized tools for electrical system procedures.

Details checking starter cable connections for proper installation and tightness.

Covers removal and installation procedures for the starting motor.

Lists specifications for the starting system, including battery capacity and circuit resistance.

Covers inspection, installation, and removal of the accessory drive pulley.

Details procedures for replacing the accessory drive, including cleaning and inspection.

Provides general information on base engine components not covered in other systems.

Lists specialized tools for base engine component procedures.

Covers assembly, cleaning, inspection, disassembly, installation, and removal of cam followers.

Details procedures for replacing the camshaft bearing support.

Outlines procedures for replacing camshaft bushings, including cleaning and installation.

Covers replacement of the camshaft gear, including cleaning, inspection, and installation.

Provides comprehensive steps for replacing the camshaft, including cleaning, inspection, installation, and removal.

Details procedures for replacing connecting rod bearings, including cleaning, inspection, installation, and removal.

Covers replacement of connecting rods, including cleaning, inspection, installation, and removal.

Outlines procedures for replacing the crankshaft gear, including cleaning, inspection, and installation.

Covers inspection, installation, and removal of the crankshaft pulley.

Details procedures for leak testing cylinder block counterbores.

Guides on inspecting cylinder block counterbores for leaks.

Discusses inspection of the cylinder block deck surface for reuse.

Details checking cylinder head capscrew holes for damage.

Covers replacement of cylinder head gaskets, including leak definition and inspection.

Provides procedures for replacing cylinder heads, including cleaning and inspection.

Details engine brake adjustment procedures, including C-Brake and replacement.

Covers inspection, installation, and removal of engine lifting brackets.

Details cleaning, inspection, installation, and removal of engine lifting brackets.

Describes procedures for redoweling the flywheel housing to the cylinder block.

Covers cleaning, inspection, installation, and removal of the flywheel housing.

Details procedures for replacing the flywheel, including cleaning and inspection.

Covers cleaning, inspection, installation, and removal of the front engine support bracket.

Details procedures for replacing the gear cover, including cleaning and inspection.

Covers injection timing measurements and codes.

Provides general information about injection timing measurement and its relation to piston travel.

Details valve and injector adjustment limits for CELECT™ engines.

Provides adjustment procedures for STC injectors using the IBC method.

Details adjustment procedures for STC injectors using the OBC method.

Details procedures for replacing main and thrust bearings, including cleaning and inspection.

Covers overhead adjustment procedures for CELECT™ and STC engines.

Covers piston and ring replacement procedures, including cleaning and inspection.

Details inspection, installation, and removal procedures for push rods.

Covers removal, cleaning, inspection, and installation of rocker housing covers.

Details procedures for replacing rocker lever housings, including cleaning and inspection.

Covers rocker lever replacement, including assembly, cleaning, inspection, installation, and removal.

Covers cleaning, inspection, installation, and removal of accessory drive seals.

Details procedures for replacing the front crankshaft seal, including cleaning and inspection.

Covers replacement of the rear crankshaft seal, including cleaning and inspection.

Details removal, cleaning, inspection, and installation of STC oil plumbing components.

Covers cleaning, inspection, installation, and removal of various plugs and fittings.

Provides valve adjustment specifications for CELECT™ engines.

Details valve adjustment specifications for STC engines.

Covers cleaning, inspection, installation, and removal of the vibration damper.

Details cleaning, inspection, installation, and removal of accessory drive pulley wear sleeves.

Provides general safety precautions and operating procedures for using a chassis dynamometer.

Defines terms related to engine performance curves and ratings.

Provides a worksheet for recording engine test data and parameters.

Guides on installing the engine on a dynamometer for testing, including coolant and sensor connections.

Outlines run-in procedures for engines tested on a chassis dynamometer, including speed and load parameters.

Details engine run-in procedures when using an engine dynamometer, covering various measurements and operating phases.

Provides run-in procedures for on-highway and off-highway applications without a dynamometer.

Provides general information on engine testing and run-in recommendations.

Lists specialized tools required for engine testing procedures.

Lists key limits and specifications for engine testing and run-in procedures.

Outlines general procedures and cautions to follow during engine run-in phases.

Provides a general procedure for conducting tests on a chassis dynamometer.

Explains how to determine and apply correction factors for intake manifold boost pressure based on temperature.

Provides instructions for installing the engine into the chassis, including connecting accessories.

Details inspection of engine mounts and brackets for cracks or damage to ensure proper alignment.

Outlines the step-by-step procedure for removing the engine from the equipment chassis.

Provides general information and considerations for engine removal and installation procedures.

Lists specialized tools required for engine removal and installation.

Provides specifications and torque values for various engine components, organized by system.

Introduces the section on engine and component specifications and lists related publications.

Lists specifications for fuel system components, including idle speed and restrictions.

Lists specifications for the lubricating oil system, including pressure, capacity, and thermostat settings.

Provides torque values for straight thread fittings and pipe plugs.

Offers conversion factors for various units of measurement used in the manual.

Lists additional publications available for purchase related to engine service.

Provides information on where and how to order service literature.

Offers a form for ordering service publications.

Lists addresses and telephone numbers for suppliers of accessories used on Cummins engines.