Yanmar 6LY2A-STP Service Manual (English)

Other manuals for Yanmar 6LY2A-STP

Questions and Answers:

K
kelly89Aug 8, 2025
What to do if Yanmar 6LY2A-STP Engine has starting failures?
- L
  Lance PrattAug 8, 2025
  If your Yanmar Engine is experiencing starting failures, consider the following potential causes. First, ensure that there is sufficient fuel in the tank and bleed any air from the fuel lines. Verify that you are using the recommended fuel type. Check the battery's fluid level and recharge or replace it if needed. Inspect the cable terminals for rust and retighten them. If the neutral safety switch is engaged, shift the clutch to neutral. For issues such as faulty fuel injection, compression leaks, a faulty safety device switch, a faulty starter switch, seized internal parts, or broken components, ask for repairs. If the battery power is lacking due to other use, consult your dealer.
S
Stephanie WilliamsAug 13, 2025
Why Yanmar Engine charge lamp does not go out during operation?
- K
  Kevin LeeAug 13, 2025
  If the charge lamp remains on during Yanmar Engine operation, it could be due to a broken or loose V-belt. Replace the V-belt or adjust its tension. Another possible cause is a defective battery; check the fluid level and specific gravity, and replace the battery if necessary. If these steps don't resolve the issue, the alternator may have a power generation failure, and you should ask for repairs.
R
Robert MillerAug 19, 2025
Why Yanmar 6LY2A-STP has poor exhaust color and black smoke?
- S
  Seth MartinAug 19, 2025
  Poor exhaust color and black smoke from a Yanmar Engine can be attributed to several factors. An increased load on the engine may be the cause, so inspect the propeller system. Contamination of the turbocharger blower can also lead to this issue, so clean the blower. If the fuel injection valve is spraying faulty, or if the intake/exhaust valve head clearance is excessive, or if the fuel injection timing lags, or if there is lube oil burning and excessive consumption, ask for repairs.
M
Michael MullenAug 26, 2025
What to do if alarm buzzer sounds and alarm lamps go on during Yanmar Engine operation?
- C
  curtiscarterAug 27, 2025
  If the alarm buzzer sounds and the alarm lamps illuminate during operation, it could be due to several reasons. First, check if the engine oil level is insufficient or the oil filter is clogged; if so, replenish the oil or replace the filter. Also, verify the marine gear lube oil level and add more if needed. Low fresh water cooler water level may also be the cause, so check and refill the coolant. If the cooling seawater system is clogged or air discharge is insufficient, ask for repairs. Finally, ensure the fuel tank level is adequate and refill if low.
K
Kimberly HillSep 1, 2025
What to do if warning devices are faulty in Yanmar 6LY2A-STP?
- C
  cjohnsonSep 1, 2025
  If the warning devices are faulty, it might be due to a broken circuit or a defective buzzer. Ask for repairs.

Yanmar 6LY2A-STP Specifications

General

Engine Model	6LY2A-STP
Number of Cylinders	6
Combustion System	Direct injection
Aspiration	Turbocharged with intercooler
Fuel Type	Diesel
Compression Ratio	17.5 : 1
Displacement	5.813 L
Cooling System	Water-cooled
Starting System	Electric starting
Lubrication System	Forced lubrication

Summary

Chapter 1 General

For Safe Servicing

Safety precautions for servicing the engine.

Exterior Views

Visual representation of engine exterior.

Specifications

Technical specifications of the engine models.

Performance Curve

Graphical representation of engine performance.

Dimensions

Detailed dimensional drawings of engine components.

Wiring Diagrams

Electrical system wiring schematics.

Piping Diagrams

Diagrams illustrating engine piping systems.

Chapter 2 Basic Engine Parts

Cylinder Block

Details and inspection of the engine's cylinder block.

Cylinder Head

Information regarding the cylinder head's construction and servicing.

Piston and Piston Pins

Specifications and procedures for pistons and pins.

Connecting Rod

Details on connecting rod inspection and servicing.

Crankshaft and Main Bearing

Information on crankshaft and main bearing maintenance.

Camshaft and Tappets

Procedures for camshaft and tappet inspection and servicing.

Timing Gear

Details on timing gear inspection and maintenance.

Flywheel

Information on flywheel specifications and dimensions.

Chapter 3 Fuel Injection Equipment

Fuel Injection Pump Construction

Detailed description of the fuel injection pump's construction.

Fuel Injection Pump Specifications

Technical specifications for fuel injection pumps.

Fuel Supply System

Explanation of the fuel supply system's operation.

Governor construction

Details on the construction and operation of the governor.

Fuel Injection Nozzle

Information on fuel injection nozzle operation and specifications.

Fuel Feed Pump

Details on the fuel feed pump's design and function.

Disassembly, Reassembly and Inspection of Governor

Procedures for governor disassembly, reassembly, and inspection.

Disassembly, Reassembly and Inspection of Fuel injection pump

Procedures for fuel injection pump disassembly, reassembly, and inspection.

Automatic Advancing Timer

Details on the automatic advancing timer's construction and function.

Chapter 4 Turbocharger System

Construction and Function

Explanation of the turbocharger system's components and operation.

Standards for Maintenance and Check

Standards for turbocharger maintenance and inspection.

Periodical Checking Procedure

Schedule and procedures for periodic turbocharger checks.

Disassembly Procedure

Step-by-step guide for turbocharger disassembly.

Cleaning and Checking Procedure

Procedures for cleaning and checking turbocharger components.

Reassembling procedure

Detailed steps for reassembling the turbocharger.

Handling After Reassembly

Precautions and steps after turbocharger reassembly.

Troubleshooting

Common problems and solutions for the turbocharger system.

Chapter 5 Lubrication System

Lubrication System

Overview of the engine's lubrication system.

Lube Oil Pump

Details on the lube oil pump's construction and specifications.

Lube Oil Filter

Information on the lube oil filter's construction and replacement.

Oil Pressure Control Valve

Details on the oil pressure control valve's construction and replacement.

Lube Oil Cooler

Information on the lube oil cooler's construction and inspection.

Piston Cooling Nozzle

Details on the piston cooling nozzle's construction and inspection.

Chapter 6 Cooling Water System

Cooling Water System

Overview of the engine's cooling water system.

Sea Water Pump

Details on the sea water pump's construction and inspection.

Fresh Water Pump

Details on the fresh water pump's construction and specifications.

Fresh Water Cooler

Information on the fresh water cooler's construction and specifications.

Pressure Cap and Sub Tank

Details on pressure caps and sub tanks.

Thermostat

Information on the thermostat's function and construction.

Chapter 7 Reduction and Reversing Gear

Specification and System

Specifications and system overview of the reduction and reversing gear.

Reassembly and disassembly (KMH6A1)

Procedures for reassembling and disassembling the KMH6A1 gear.

Cautions for Reassembly

Important precautions to follow during reassembly.

Chapter 8 Remote Control(Optional)

Remote Control System (Option)

Details on the optional remote control system.

Remote Control Installation

Procedures for installing the remote control system.

Chapter 9 Electrical System

System Diagram

Electrical system diagram showing component layout.

Battery

Information on battery construction, capacity, and inspection.

Starter Motor

Details on the starter motor's specifications, construction, and maintenance.

Alternator

Information on the alternator's features, specifications, and troubleshooting.

Instrument Panel

Overview of the instrument panel and its gauges.

Warning Devices

Details on warning devices like oil pressure and water temperature alarms.

Tachometer

Information on the tachometer's construction and specifications.

Chapter 10 Disassembly and Reassembly

Disassembly and Reassembly Precautions

Essential precautions for disassembly and reassembly procedures.

Disassembly and Reassembly Tools

List of necessary tools for disassembly and reassembly.

Special Handtools

Specific hand tools required for disassembly and reassembly.

Measuring Instruments

List and application of measuring instruments.

Other material

List of other materials used in disassembly/reassembly.

Disassembly and Reassembly

Step-by-step procedures for engine disassembly and reassembly.

Main parts spec./tightening torque

Specifications and tightening torques for main engine parts.

Measure nut/tightening torque

Procedures for measuring nuts and applying correct tightening torque.

Test running

Procedures and precautions for testing the engine after reassembly.

Chapter 11 Troubleshooting

Troubleshooting

General troubleshooting guide for engine issues.

Related product manuals

Yanmar 6LY2A-STP Service Manual

Table of Contents

Other manuals for Yanmar 6LY2A-STP

Questions and Answers:

Yanmar 6LY2A-STP Specifications

Summary

Chapter 1 General

For Safe Servicing

Exterior Views

Specifications

Performance Curve

Dimensions

Wiring Diagrams

Piping Diagrams

Chapter 2 Basic Engine Parts

Cylinder Block

Cylinder Head

Piston and Piston Pins

Connecting Rod

Crankshaft and Main Bearing

Camshaft and Tappets

Timing Gear

Flywheel

Chapter 3 Fuel Injection Equipment

Fuel Injection Pump Construction

Fuel Injection Pump Specifications

Fuel Supply System

Governor construction

Fuel Injection Nozzle

Fuel Feed Pump

Disassembly, Reassembly and Inspection of Governor

Disassembly, Reassembly and Inspection of Fuel injection pump

Automatic Advancing Timer

Chapter 4 Turbocharger System

Construction and Function

Standards for Maintenance and Check

Periodical Checking Procedure

Disassembly Procedure

Cleaning and Checking Procedure

Reassembling procedure

Handling After Reassembly

Troubleshooting

Chapter 5 Lubrication System

Lubrication System

Lube Oil Pump

Lube Oil Filter

Oil Pressure Control Valve

Lube Oil Cooler

Piston Cooling Nozzle

Chapter 6 Cooling Water System

Cooling Water System

Sea Water Pump

Fresh Water Pump

Fresh Water Cooler

Pressure Cap and Sub Tank

Thermostat

Chapter 7 Reduction and Reversing Gear

Specification and System

Reassembly and disassembly (KMH6A1)

Cautions for Reassembly

Chapter 8 Remote Control(Optional)

Remote Control System (Option)

Remote Control Installation

Chapter 9 Electrical System

System Diagram

Battery

Starter Motor

Alternator

Instrument Panel

Warning Devices

Tachometer

Chapter 10 Disassembly and Reassembly

Disassembly and Reassembly Precautions

Disassembly and Reassembly Tools

Special Handtools

Measuring Instruments

Other material

Disassembly and Reassembly

Main parts spec./tightening torque

Measure nut/tightening torque