Part of the Yanmar Repair Manuals.
With the head off a Yanmar 6LY(M)-UTE or 6LY(M)-STE and six valve seats showing recession, the question is not whether to recondition but where the limits sit. This service manual (Yanmar publication HINSHI-H7004, 120 pages) lays out those limits: inspection and service procedures for the cylinder head, pistons and pins, connecting rods, cylinder sleeves, crankshaft and main metal, camshaft and tappets, timing gear, cylinder block, lube oil system, cooling water system, fuel oil system, electrical equipment, marine gears, turbocharger, and intercooler.
It walks the full disassembly and reassembly of this six-cylinder marine diesel, then backs the procedures with standard service data, adjustment check points, and main bolt and nut tightening torques. Troubleshooting charts cover sudden stops, uneven cylinder output, poor exhaust color, and turbocharger and marine gear trouble.
If you are alone at the stand with no dealer to call, this is the reference that gets the engine back together to spec.
Complete the set for your 6LY(M)-UTE, 6LY(M)-STE
- Operator Manual: Yanmar 6LY(M)-UTE, 6LY(M)-STE Operator Manual
What's Inside This Manual
| System | Pages | Key Topics |
|---|---|---|
| Specifications | 5-7 | Principal Specifications, Identification of Important Parts |
| Performance Curves | 8-9 | Specific Fuel Consumption, Torque, Output |
| Disassembly and Reassembly | 10-34 | Preparation Before Disassembly and Reassembly, Tools and Measurement Instruments, Assembly Procedure |
| Engine Component Inspection | 35-55 | Cylinder Head, Piston and Piston Pin, Connecting Rod, Cylinder Sleeve, Crankshaft and Main Metal, Cam Shaft and Tappet, Timing Gear, Cylinder Block |
| Lubrication & Cooling Systems | 56-69 | Lube Oil System, Cooling Water System |
| Fuel & Electrical Systems | 70-86 | Fuel Oil System, Electrical Equipment |
| Marine Gears & Turbocharger | 87-107 | Marine Gears, Turbocharger |
| Troubleshooting | 108-112 | The Engine Suddenly Stops, Cylinder Output Is Uneven, Poor Exhaust Color, Trouble with the Turbocharger, Trouble with Marine Gear, Miscellaneous Trouble |
| Standard Service Data | 113-117 | Adjustment Data Check Points, Important Reference Data at Assembly |
| Main Bolt and Nut Tightening Torque | 118-119 | General Tightening Torque, Tightening Torques, Standard Tightening Torque |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Seawater pump water pressure test | 4kg/cm² | p. 63 |
| Oil filter replacement schedule | Every 250 hours | p. 60 |
| Thermostat valve-opening temperature | 76.5±2°C | p. 115 |
| Thermostat valve lift (at 90°C) | 10mm | p. 115 |
| Number of cylinders | 6 | p. 1 |
| Max speed at no load | 3720 ± 25 rpm | p. 5 |
| Min speed at no load | 700 ± 25 rpm | p. 5 |
| Lube oil delivery | ≥5670 at 3200rpm | p. 6 |
| Lube oil pressure | 0.441 ± 0.049 MPa | p. 6 |
| Main bearing cap tightening torque | 24 ± 1 kgf-m | p. 50 |
