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.
What's Inside This Yanmar 6LY2-STE, 6LY2A-STP, 6LYA-STP 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 |
Yanmar 6LY2-STE, 6LY2A-STP, 6LYA-STP Common Problems This Manual Covers
Valve train damage and lost compression
Owners of these engines discuss dropped and worn valves, which show up as rough running or a sudden loss of compression on one cylinder. The manual's coverage of the cylinder head, valve guides and seats gives you the inspection and servicing procedure to check the top end before it fails.
Manual Section: Inspection and Servicing of Basic Engine Parts p. 27Overheating from cooling system neglect
These engines are sensitive to coolant condition, and a tired sea water pump impeller or stuck thermostat brings temperatures up fast. The manual covers the sea water pump, fresh water pump, fresh water cooler and thermostat so you can work through the raw and fresh water circuits in order.
Manual Section: Cooling Water System p. 129Low oil pressure warnings
A falling oil pressure reading points at the lube oil pump, the oil pressure control valve or a fouled cooler. This section lays out the lubrication circuit and each of those components, including the piston cooling nozzles, so you can isolate the cause instead of guessing.
Manual Section: Lubrication System p. 119Hard starting after fuel work
Air drawn in during a filter change or a tired feed pump leaves the engine cranking without firing. The manual covers the fuel supply system, feed pump, injection nozzles, and full disassembly, reassembly and inspection of the injection pump and governor.
Manual Section: Fuel Injection Equipment p. 58Black smoke and lost boost
Carbon and salt-laden intake air foul the turbocharger over time, showing up as smoke and sluggish response under load. The manual gives construction and function, maintenance standards, periodical checking, disassembly and cleaning procedures for the turbo.
Manual Section: Turbocharger System p. 99Slow cranking and charging faults
Marine electrics corrode, and a weak battery, dragging starter motor or failing alternator all present as the same reluctant start. The system diagram, starter, alternator, instrument panel and warning device coverage lets you test each link in the chain.
Manual Section: Electrical System p. 158Rough or slipping gear engagement
Wear in the reduction and reversing gear shows up as harsh shifts or slip under way. The manual covers the specification and system plus reassembly and disassembly of the KMH6A1 gear, with cautions for putting it back together correctly.
Manual Section: Reduction and Reversing Gear p. 144Frequently Asked Questions
Which engines does this manual cover?
It covers the Yanmar 6LY2-STE, 6LY2A-STP and 6LYA-STP six-cylinder marine diesel engines. This is Yanmar service manual publication HINSI-H8-011-1, written in English, 234 pages.
Does it include cylinder head and bearing torque specifications?
Yes. The Disassembly and Reassembly section finishes with main parts specifications and tightening torques, including the staged cylinder head bolt sequence, connecting rod and main bearing cap bolt figures, plus test running procedures for after the engine goes back together. p. 189
Can I rebuild the sea water pump and sort cooling problems with it?
Yes. The Cooling Water System section covers the sea water pump, fresh water pump, fresh water cooler, pressure cap and sub tank, thermostat, and the optional Kingston cock, so both the raw water and fresh water sides are documented. p. 129
Are wiring diagrams included?
Yes. The General section includes wiring diagrams and piping diagrams alongside specifications, performance curves and dimensions for all three engine models. p. 6
How quickly can I access this manual?
Instant PDF download. You get the full 234-page searchable Service Manual immediately after payment. Open it on your laptop, tablet, or phone right in the shop.
Am I able to print pages from this manual?
The PDF is DRM-free. Print whatever sections you need to take out to the shop. Standard letter or A4 paper works.
Is the hydraulic system diagrammed in this Yanmar 6LY2-STE manual?
Not as a separate hydraulic chapter — this is a marine engine manual. The General section carries the piping diagrams alongside the wiring diagrams, specifications, performance curves and dimensions, and the Reduction and Reversing Gear section covers the KMH6A1 marine gear, whose lube oil capacity the specifications give as 18 litres on page 15.
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