Yanmar 6AYEM-GT ET ST Marine Diesel Engine Service Manual PDF
Original price was: $95.00.$19.95Current price is: $19.95.
Official Yanmar 6AYEM series factory service manual covering models 6AYEM-GT, 6AYEM-ET & 6AYEM-ST — the 20.4L inline-6 turbocharged marine diesel. Includes full disassembly/reassembly procedures, cylinder head, crankshaft, turbocharger, fuel injection, cooling system, electrical system, periodic maintenance schedule, troubleshooting, torque specs, and service reference tables. 164 pages of genuine OEM documentation. Instant PDF download.
Description
Yanmar 6AYEM-GT ET ST Marine Diesel Engine Service Manual PDF DOWNLOAD
DESCRIPTION
Yanmar 6AYEM-GT / 6AYEM-ET / 6AYEM-ST — Official Factory Service Manual
This is the genuine Yanmar factory service manual for the 6AYEM series commercial marine diesel engines, covering all three variants: 6AYEM-GT, 6AYEM-ET, and 6AYEM-ST (including EPA-compliant versions). At 164 pages, this OEM document delivers the full engineering-level detail that Yanmar dealers and authorised marine service workshops rely on — covering everything from complete engine disassembly and inspection through to turbocharged fuel injection diagnostics, periodic maintenance scheduling, and test running after servicing.
📋 File Details
| Detail | Info |
|---|---|
| Manual Type | OEM Factory Service Manual |
| Publisher | Yanmar Co., Ltd. |
| Models Covered | 6AYEM-GT, 6AYEM-ET, 6AYEM-ST (including 6AYEM-ET for EPA, 6AYEM-ST for EPA) |
| Engine Application | Commercial Marine / Vessel Propulsion |
| Total Pages | 164 pages |
| PDF Quality | Scanned factory document — clean, clearly readable diagrams, tables, and service data throughout |
📑 Table of Contents
- For Your Safety
- Warning Symbols
- Safety Precautions
- Warning Labels
- Precautions for Lifting the Engine
- Engine Specifications
- Location of Components
- Piping Diagram (Cooling Water, Lubricating Oil & Fuel Oil Systems)
- Fuel Oil, Lubricating Oil and Coolant Selection
- SI Unit Conversions
- Disassembly and Assembly
- Disassembly and Reassembly Tools
- Precautions for Disassembly and Reassembly
- Disassembly Procedures
- Reassembly Procedures
- Inspecting and Servicing of Engine’s Major Parts
- Preliminaries / Standards for Parts Replacement
- Cylinder Head
- Cylinder Block
- Cylinder Liner
- Pistons
- Connecting Rods
- Crankshaft and Main Bearing
- Oil Seal of the Crankshaft
- Camshaft and Tappets
- Timing Gear
- Viscous Damper
- Fuel Oil System
- Lubricating Oil System
- Cooling Water System
- Air Cooler
- Turbocharger
- Electrical System
- Maintenance Inspections
- Precautions for Maintenance and Inspections
- Periodic Maintenance Schedule
- Long-Term Storage
- Engine storage procedures and re-commissioning
- Troubleshooting and Countermeasures
- Systematic fault diagnosis with SA-D diagnostic tool
- DTC code identification via LCD monitor
- Service Reference Table
- Dimensional standards, tolerances, and maximum allowances for all major components
- Reference Adjustment Values
- Tightening Torques for Major Bolts and Nuts
- Test Running After Servicing
⚙️ Engine Specifications at a Glance
| Parameter | Specification |
|---|---|
| Engine Type | Vertical, water-cooled, 4-cycle diesel |
| Combustion System | Direct injection — Modular Common Rail (MCRS) |
| No. of Cylinders | 6 (inline) |
| Bore × Stroke | 155 × 180 mm |
| Displacement | 20.379 L |
| Crankshaft Rotation | Counterclockwise (viewed from flywheel side) |
| Firing Order | 1-4-2-6-3-5 (No. 1 = Flywheel side) |
| Fuel Supply Pump | High pressure pump — Variable injection timing (Electronic control) |
| Max Injection Pressure | Up to 160 MPa |
| Lubrication | Forced lubrication with gear pump |
| Cooling System | Fresh water (coolant) + seawater dual circuit |
| Lube Oil Capacity (Standard Pan) | 91 L |
| Lube Oil Capacity (Shallow Pan) | 53 L |
Rated Output by Variant:
| Model | Output (kW / PS) | Rated Speed (min⁻¹) |
|---|---|---|
| 6AYEM-GT (S) | 737 kW / 1002 PS | 2000 |
| 6AYEM-GT (L) | 670 kW / 911 PS | 1938 |
| 6AYEM-ET (M) | 610 kW / 829 PS | 1900 |
| 6AYEM-ET (H) / EPA | 555 kW / 755 PS | 1840 |
| 6AYEM-ST (M) / EPA | 599 kW / 814 PS | 1900 |
| 6AYEM-ST (H) / EPA | 485 kW / 659 PS | 1900 |
🔧 Periodic Maintenance Schedule Highlights
| Service Interval | Key Tasks |
|---|---|
| Daily | Check fuel level, oil level, coolant discharge condition |
| Every 50 hours | Drain fuel/water separator, check oil pressure |
| Every 250 hours | Replace oil filter (1st), clean by-pass filter, check alternator V-belt |
| Every 500 hours | Clean oil cooler, replace seawater pump impeller, check valve clearance |
| Every 1,000 hours | Replace fuel filter & fuel/water separator element |
| Every 1,500 hours | Check & adjust valve clearance (recurring), clean fuel injector (EPA) |
| Every 4,500 hours | Check injector, turbocharger, ECU sensors & actuators |
| Top Overhaul (6,000–9,000 hrs) | Piston rings, turbo bearings, intake/exhaust valve lapping, viscous damper |
| Major Overhaul (9,000–10,000 hrs) | Coolant pump mechanical seal, thermostat, rubber hoses |
🔑 Who Is This Manual For?
This Yanmar 6AYEM service manual PDF download is indispensable for:
- Yanmar authorised marine dealers and distributors carrying out scheduled and warranty servicing
- Commercial vessel owners and operators managing in-house maintenance of 6AYEM-powered craft
- Independent marine engineers working on high-powered commercial or sportfishing vessels
- Marine refit yards and engine overhaul specialists requiring factory clearances, torque specs, and reassembly sequences
- EPA compliance managers overseeing emission-regulated 6AYEM-ET / 6AYEM-ST engines
⚡ A 6AYEM engine producing up to 1,002 PS deserves factory-accurate service — not guesswork. This official Yanmar service manual gives you every clearance tolerance, torque value, turbocharger inspection procedure, and MCRS fuel system service step used by Yanmar’s own engineers. Download it instantly and protect your investment with the precision your engine demands.
