Part of the Yanmar Repair Manuals.
A rebuild stalls the moment you need one number you do not have: a main bearing clearance, a head bolt sequence, an injector nut torque. This Yanmar service manual, publication HINSI-H8-011-1, carries those figures for the 6LY2-STE, 6LY2A-STP and 6LYA-STP six-cylinder marine diesels.
Across 234 pages it walks each system end to end: cylinder block and head, pistons, crankshaft, camshaft and timing gear, the fuel injection pump and governor, the turbocharger, lubrication, the fresh and sea water cooling circuits, the KMH6A1 reduction and reversing gear, and the electrical system with wiring diagrams. A dedicated troubleshooting chapter closes the book.
The PDF downloads immediately and carries 272 bookmarks, so you can jump straight from a symptom to the clearance or torque value that resolves it, print the pages you need at the bench, and get the engine turning under its own power again.
Complete the set for your 6LY2-STE, 6LY2A-STP, 6LYA-STP
What's Inside This Manual
| System | Pages | Key Topics |
|---|---|---|
| General | 6-26 | Exterior Views, Specifications, Performance Curves, Dimensions, Wiring Diagrams, Piping Diagrams |
| Inspection and Servicing of Basic Engine Parts | 27-57 | Cylinder Block, Cylinder Head, Piston and Piston Pins, Connecting Rod, Crankshaft and Main Bearing, Camshaft and Tappets, Timing Gear, Flywheel |
| Fuel Injection Equipment | 58-98 | Fuel Injection Pump Construction, Fuel Injection Pump Specifications, Fuel Supply System, Fuel Injection Nozzle, Fuel Feed Pump, Disassembly, Reassembly and Inspection of Governor |
| Turbocharger System | 99-118 | Construction and Function, Standards for Maintenance and Check, Periodical Checking Procedure, Disassembly Procedure, Cleaning and Checking Procedure |
| Lubrication System | 119-128 | Lube Oil Pump, Lube Oil Filter, Oil Pressure Control Valve, Lube Oil Cooler, Piston Cooling Nozzle, Rotary Waste Oil Pump(Optional) |
| Cooling Water System | 129-143 | Sea Water Pump, Fresh Water Pump, Fresh Water Cooler, Pressure Cap and Sub Tank, Thermostat, Kingston Cock(Optional) |
| Reduction and Reversing Gear | 144-154 | Specification and System, Readdembly and disassembly(KMH6A1), Cautions for Reassembly |
| Remoto Control(Optional) | 155-157 | Remoto Control System(Option), Remoto Control Installation |
| Electrical System | 158-188 | System Diagram, Battery, Starter Motor, Alternator, Instrument Panel, Warning Devices, Tachometer |
| Disassembly and Reassembly | 189-227 | Disassembly and Reassembly Precautions, Disassembly and Reassembly Tools, Main Parts Spec./ Tightening Torque, Test Running |
| Troubleshooting | 228-233 |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| All Models | ||
| Cylinder head bolt tightening torque (multi-step) | 118~177~226±10 N·m(kgf·m) | p. 226 |
| Intake valve seat angle | 120° | p. 33 |
| Exhaust valve seat angle | 90° | p. 33 |
| Fresh water pump impeller to pump body clearance (Standard) | 0.3~1.1 mm | p. 136 |
| Thermostat valve lift at full open | 8 mm | p. 141 |
| Delivery of seawater pump | ≧215 ℓ/min | p. 223 |
| Number of Cylinders | 6 | p. 1 |
| 6LY2-STE/6LY2A-STP | ||
| Nozzle tightening nut torque | 68.6~73.5 N·m (7.0~7.5 kgf·m) | p. 68 |
| 6LY2-STE | ||
| 6LY2-STE Max. Output at Crankshaft | 309(420)/3300 kw(hp)/rpm | p. 14 |
| 6LY2-STE Engine Lube Oil Capacity (Full/Effective) | 20.0 L / 8.0 L | p. 14 |
| 6LY2A-STP | ||
| 6LY2A-STP Fuel Stop Power (Flywheel Output) | 324/3300 kw/rpm | p. 15 |
| 6LYA-STP | ||
| 6LYA-STP Fuel Stop Power (Flywheel Output) | 272/3300 kw/rpm | p. 15 |
