Part of the Yanmar Operator Manuals.
Need the factory operation data for your Yanmar 6N18(A)L-V marine propulsion engine? This 353-page Yanmar 6N18(A)L-V operation manual PDF (OEM #06-6N18(A)VH-220) covers the full 6N18L family: DV, UV, SV, EV, and AL-HV variants. Inside: engine system diagrams mapping every fluid circuit and device arrangement, routine maintenance schedules with step-by-step adjusting procedures, full servicing procedures for cylinder head, pistons, connecting rods, main bearings, and timing gear, plus clearances and wear limits for every major component. You also get a troubleshooting section, a major-bolt torque table, and an illustrated parts list covering cylinder head through lubrication assemblies. Set nozzle sleeve torque to 157~167 N-m running MDO, or 245~265 N-m on HFO, then confirm injection pressure holds at 34.0 ± 0.5 MPa. Your vessel doesn't wait for shore support. Bookmarked by section; search any spec by keyword and get back to the engine room.
What's Inside This Manual
| System | Pages | Key Topics |
|---|---|---|
| Preface | 3-20 | Foreword, Terms & Symbol Marks |
| Engine Description | 21-26 | Engine Specification, Types of Accessories & Attachments, Sectional View of the Engine, Engine Outline & Device Arrangement |
| Structure of Major Parts | 27-32 | Cylinder Block, Cylinder Liner, Cylinder Head, Piston and Piston Rings, Connecting Rod, Fuel Injection Pump |
| Table of Engine Standard Adjustments | 33-35 | Assembly Adjustment Values, Pressure & Temperature Setting Values, Protective Device Setting Values, Holding Volumes of Lubricating Oil and Cooling Water |
| Operation | 36-50 | Operational Preparation, Starting, Running, Stopping |
| Fuel Oil, Lub. Oil & Cooling Water | 51-62 | Fuel Oil, Lubricating Oil, Cooling Water (Engine Jacket Water) |
| Maintenance Checking | 63-103 | Precautions in Maintenance Checking, Routine Maintenance Checking & Adjusting Procedures |
| Maintenance Servicing | 104-163 | Precautions in Maintenance Servicing, Cylinder Head & Its Accessories, Piston & Connecting Rod, Cylinder Block & Cylinder Liner, Main Bearing & Crankshaft, Timing Gear |
| Principal Dimensions & Part Mass for Disassembly & Servicing | 164-166 | Cylinder Head Mass, Piston & Connecting Rod Assy. Mass, Cylinder Liner Mass, Air Cooler Mass, Crankshaft Mass, Flywheel Mass |
| Table of Tightening Torques of Major Bolts | 167-170 | Hydraulic Pressure Clamping Bolt, Angle Clamping Bolts, Other Major Bolts (Torque Tightening), Indicator Cock Tightening Nut, Rocker Arm Shaft Stand Clamping Bolt |
| Clearances & Wear Limits of Major Parts | 171-174 | Cylinder & Cylinder Liner, Piston Piston Pin & Rings, Crankshaft, Lub. Oil Pump, Cooling Water Pump, Fuel Oil Feed Pump |
| Troubleshooting & Countermeasures | 175-180 | Starting Failure, Rotational Speed Dropped Spontaneously, Bad Color of Exhaust Gas, Lub. Oil Pressure Dropped Below the Specified Pressure |
| Fig 1. Cylinder Head Ass'y | 186-191 | Cylinder Head Parts, Valve & Seat Components, Injector Nozzle Holder Assembly |
| Fig 3. Indicator Cock Ass'y | 192-194 | Valve Rotator Parts, Indicator Cock Components, Spring & Sealing Elements |
| Fig 5-1. Cylinder Block Side Cover Ass'y | 195-196 | Valve Mechanism Parts, Side Cover Gaskets, Mounting Bolts & Hardware |
| Fig 5-2. Cylinder Block Side Cover Ass'y, with Lub. Oil Filler | 197 | Lubricating Oil Filler Cap, Side Cover Components, Filler Seals & Gaskets |
| Fig 5-3. Cylinder Block Side Cover Ass'y, with Safety Valve | 198 | Safety Valve Assembly, Spring-Loaded Relief Valve, Side Cover Sealing Elements |
| Fig 6. Cylinder Liner Ass'y | 199 | Cylinder Liner Parts, O-Ring Seals, Liner Cooling Jacket Components |
| Fig 7. Main Bearing Ass'y | 200-201 | Main Bearing Shells, Bearing Caps, Bearing Retaining Bolts |
| Fig 8. Turning Device | 202-353 | Turning Gear Assembly, Turning Device Components, Engagement Mechanism |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Cylinder head tightening nut torque | 58.8 ± 0.5 MPa (600 ± 5 kgf/cm²) | p. 167 |
| Fuel injection valve nozzle sleeve torque (Engine Using MDO) | 157~167 N-m (16~17 kgf-m) | p. 168 |
| Fuel injection valve nozzle sleeve torque (Engine Using HFO) | 245~265 N-m (25~26 kgf-m) | p. 168 |
| Nozzle average service life | 2,500 hours | p. 78 |
| Exhaust manifold clamping bolt torque | 59~69 N-m (6~7 kgf-m) | p. 168 |
| Exhaust expansion joint clamping bolt torque | 59~69 N-m (6~7 kgf-m) | p. 168 |
| Main bearing cap side bolt torque | 343~382 N-m (35~39 kgf-m) | p. 168 |
| Lub. oil strainer overhaul cleaning interval | 10~15 days | p. 64 |
| Turbocharger lubricating oil strainer element replacement criterion (pressure drop) | 0.3 MPa (3 kgf/cm²) | p. 92 |
| Cooling fresh water pH | 6.3~8.0 | p. 60 |
| Cooling fresh water total hardness (CaCO3) | < 100 ppm | p. 60 |
| Piston top clearance | 2.0 ± 0.2 mm | p. 33 |
