Part of the Yanmar Repair Manuals.
Looking for the factory procedures to rebuild your Yanmar 2QM15 marine diesel engine? This 221-page Yanmar 2QM15 Service Manual PDF (OEM #2F015A) brings you the exact teardown, inspection, and reassembly data straight from the manufacturer. Open it up to find complete electrical wiring diagrams, fuel system exploded views, and a dedicated troubleshooting section for tracing engine faults. You get step-by-step procedures covering everything from basic cooling system maintenance to a full reduction and reversing gear rebuild. Verify your secondary oil pressure hits 0.5 kg/cm² at idle, and make sure to tighten the cylinder head nuts down to exactly 15 to 16 kg-m during reassembly. Guesswork leads to blown gaskets and dead engines on the water. Grab this bookmarked download, pull it up on your shop tablet, and fix your boat right the first time.
What's Inside This Yanmar 2QM15 Manual
| System | Pages | Key Topics |
|---|---|---|
| Chapter 1 General | 4-20 | Exterior Views, Specifications, Principal Construction, Performance Curves, Features, Sectional Views, System Diagrams, Standard Accessories |
| Chapter 2 Basic Engine | 21-52 | Cylinder Block, Cylinder Liner, Cylinder Head, Piston, Connecting Rod, Crankshaft, Camshaft, Timing Gear |
| Chapter 3 Fuel System | 53-69 | Construction, Injection Pump, Injection Nozzle, Fuel Filter, Fuel Feed Pump, Fuel Tank (Optional) |
| Chapter 4 Governor | 70-78 | Governor, Injection Limiter, No-Load Maximum Speed Limiter, Engine Stop Spring |
| Chapter 5 Intake and Exhaust System | 79-83 | Intake and Exhaust System, Intake Silencer, Exhaust System, Breather Pipe |
| Chapter 6 Lublication System | 84-91 | Lubrication System, Oil Pump, Oil Filter, Oil Pressure Regulator Valve, Oil Pressure Measurement |
| Chapter 7 Cooling System | 92-102 | Cooling System, Water Pump, Thermostat, Anticorrosion Zinc, Kingston Cock, Bilge Strainer |
| Chapter 8 Reduction and Reversing Gear | 103-124 | Construction, Installation, Operation and Maintenance, Inspection and Servicing, Disassembly, Reassembly |
| Chapter 9 Remote Control System | 125-130 | Construction, Clutch Regulator One-Handle Remote Control, Decompression Remote Control, Engine Stop Remote Control |
| Chapter 10 Electrical System | 131-155 | Composition, Battery, Starter Motor, Alternator, Alarm Circuit |
| Chapter 11 Installation and Fitting | 156-171 | Propeller Selection, Engine Installation, Stern Equipment, Interior Piping and Wiring, Front Power Take-Off |
| Chapter 12 Operating Instructions | 172-186 | Fuel Oil and Labricating Oil, Engine Operating Instructions, Troubleshooting and Repair |
| Chapter 13 Disassembly and Reassembly | 187-214 | Disassembly and Reassembly Precautions, Disassembly and Reassembly Tools, Other, Disassembly, Reassembly, Tightening Torque |
| Chapter 14 Inspection and Servicing | 215-220 | Periodic Inspection and Servicing |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Cylinder head tightening nut torque | 15 ~ 16 kg-m | p. 212 |
| Fuel sucked back (delivery valve) | 23.5mm³/stroke | p. 57 |
| Fuel filter element replacement period | Every 100 hours | p. 67 |
| Oil filter replacement period | Every 300 hours of engine operation | p. 89 |
| Secondary oil pressure standard value (Idling) | 0.5 kg/cm² (7.112 lb/in.²) | p. 91 |
| Secondary oil pressure standard value (3,000 rpm) | 2.5 ~ 3.5 kg/cm² (35.56 ~ 49.78 lb/in.²) | p. 91 |
| Compression Ratio | 23:1 | p. 6 |
| Fuel Injection Pressure | 160 ± 10 kg/cm² | p. 6 |
| Battery Voltage | 12 V | p. 144 |
| Alternator Output Current (Standard) | 35A/5000 rpm | p. 144 |
| Connecting Rod Bolt Tightening Torque | 4.5 ~ 5 kg-m | p. 212 |
Yanmar 2QM15 Common Problems This Manual Covers
Yanmar 2QM15 engine runs normally for a few hours and then suddenly quits or loses prime
Inspect the injector return line routing. Reroute the hose directly back to the tank to prevent a closed circuit that traps air. Replace the secondary fuel filter element every 100 hours as noted on page 67. Bleed the system completely before attempting a restart.
Manual Section: Fuel System Troubleshooting p. 67Engine experiences hard cold starting or fails to turn over after sitting overnight
Check the input fuel lines and check valves for drain-back. Install a new check valve if fuel siphons back while sitting. Verify the delivery valve fuel sucked back amount is 23.5mm³/stroke as specified on page 57. Bleed the lines and test cold start performance.
Manual Section: Fuel System Troubleshooting p. 57Dipstick shows unexpected high oil level and the gauge displays abnormal oil pressure readings
Drain excess oil and verify the secondary oil pressure at idling is exactly 0.5 kg/cm² (7.112 lb/in.²) as shown on page 91. Replace the oil filter every 300 hours of engine operation according to page 89. Test the oil pressure alarm operating pressure.
Manual Section: Lubrication System Troubleshooting p. 91Frequently Asked Questions
What are the torque specs for the cylinder head bolts?
The tightening torque for the cylinder head nuts is 16 kg-m (116 ft-lb). For the cylinder head tightening nut, the specification is M14 x 1.5 with a torque of 15 ~ 16 kg-m. The rocker arm support nut requires 2.0 ~ 2.5 kg-m. p. 209
How
High cooling water temperature is a symptom of overheating, which can be caused by insufficient cooling water, a dirty cooling system, or a faulty thermostat. The alarm circuit for cooling water temperature is designed to activate when the temperature reaches 90° ±2°C. During normal operation, the cooling water temperature should be between 45 ~ 55°C. p. 185
How will I receive this Yanmar 2QM15 Service Manual?
This is a 221-page searchable PDF (14 MB) ready for immediate download. Works on any device, so pull it up on your phone while you're under the hood. No shipping, no waiting.
Am I able to print pages from this Yanmar 2QM15 manual?
No restrictions at all. Print individual pages, full chapters, or the entire manual. The PDF is completely unlocked.
Can I find wiring schematics in this Yanmar 2QM15 manual?
Complete wiring diagrams are included, covering all electrical circuits, harness routing, and connector pinouts for the Yanmar 2QM15.
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