Part of the Yanmar Repair Manuals.
Set the valve lash, check the crank endplay, and the next question is always what the book says: this Yanmar service manual (publication HINSHI-H8001) carries the 6LYA-UTE and 6LYA-STE marine diesels from that first check through complete teardown. It works the basic engine parts, fuel injection pump and governor, turbocharger, lubrication, sea water and fresh water cooling, and the electrical system end to end, with wiring and piping diagrams, specifications, and performance curves collected in Chapter 1.
The KMH6A reduction and reversing gear gets its own chapter, and the manual also lists the HSW800A2 and MG5050A gear models. Chapter 10 pulls the whole job together: disassembly order, tools, bolt and nut tightening torques, and test running after reassembly.
It is a 214 page PDF with 75 bookmarks, so from a leaking sea water pump to main bearing clearances, the section you need is two clicks away at the bench.
Complete the set for your 6LYA Series
- Parts Catalog: Yanmar 6LYA Series Marine Diesel Engine Parts Catalog
What's Inside This Manual
| System | Pages | Key Topics |
|---|---|---|
| General | 5-15 | Exterior Views, Specifications, Performance Curves, Dimensions, Wiring Diagrams, Piping Diagrams |
| Inspection and Servicing of Basic Engine Parts | 16-46 | Cylinder Block, Cylinder Sleeve, Cylinder Head, Piston and Piston Pins, Connecting Rod, Crankshaft and Main Bearing, Camshaft and Tappets, Timing Gear |
| Fuel Injection Equipment | 47-86 | Fuel Injection Pump Construction, Fuel Injection Pump Specifications, Fuel Supply System, Fuel Injection Nozzle, Fuel Feed Pump, Disassembly |
| Intake and Exhaust System | 87-100 | Turbocharger |
| Lubrication System | 101-110 | Lube Oil Pump, Lube Oil Filter, Oil Pressure Control Valve, Lube Oil Cooler, Piston Cooling Nozzle, Rotary Waste Oil Pump (Optional) |
| Cooling Water System | 111-125 | Sea Water Pump, Fresh Water Pump, Fresh Water Cooler, Pressure Cap and Sub Tank, Thermostat, Kingston Cock (Optional) |
| Reduction and Reversing Gear | 126-136 | Specification and System, Reassembly and Disassembly (KMH6A), Cautions for Reassembly |
| Remote Control (Optional) | 137-139 | Remote Control System (Option), Remote Control Installation |
| Electrical System | 140-170 | System Diagram, Battery, Starter Motor, Alternator, Instrument Panel, Warning Devices, Tachometer |
| Disassembly and Reassembly | 171-207 | Disassembly and Reassembly Precautions, Disassembly and Reassembly Tools, Bolt/Nut Tightening Torque, Test Running |
| Troubleshooting | 208-213 |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Cylinder head bolt tightening torque (First stage) | 15.0~16.0 kg-m | p. 26 |
| Cylinder head bolt tightening torque (Second stage) | 20.0~22.0 kg-m | p. 26 |
| Nozzle fastening nut tightening torque | 0.4~0.5 kg-m | p. 201 |
| Exhaust valve clearance | 0.4 mm | p. 28 |
| Lube oil filter replacement period | Every 250 hours of engine operation | p. 106 |
| Main bearing clearance standard value | 0.036~0.093 mm | p. 204 |
| Cylinder head gasket thickness at tightening | 1.30±0.05 mm | p. 202 |
| Alternator Nominal Output | 12V/80A | p. 155 |
| Thermostat Opening Temperature | 76.5°C | p. 123 |
