Yanmar 3YM30 3YM20 2YM15 Marine Diesel Repair Manual PDF Download

Description

Yanmar 3YM30 3YM20 2YM15 Marine Diesel Service Manual PDF DOWNLOAD

Description

This is the official YANMAR factory Service Manual for Marine Diesel Engines 3YM30 / 3YM20 / 2YM15 (Publication No. M9961-03E101). It’s written for technicians and covers construction, functions, inspection, maintenance, troubleshooting, and overhaul—ideal for boat owners, marine mechanics, and service workshops.

✅ Full Table of Contents (Complete)

1. General

• 1.1 Exterior views

• 1.2 Specifications

• 1.3 Fuel oil, lubricating oil and cooling water

  • Fuel oil / Lubricating oil / Cooling water

• 1.4 Engine outline

• 1.5 Piping diagrams

• 1.6 Exhaust gas emission regulation

  • Engine identification (EPA/ARB)

  • Emission standard (EPA/ARB)

  • Guarantee conditions for emission standard

2. Inspection and adjustment

• 2.1 Periodic maintenance schedule

• 2.2 Periodic inspection & maintenance procedure

  • Check before starting

  • After initial 50 hours / one month

  • Every 50 hours / monthly

  • Every 100 hours / six months

  • Every 150 hours / one year

  • Every 250 hours / one year

  • Every 1,000 hours / four years

• 2.3 Adjusting no-load maximum/minimum speed

• 2.4 Sensor inspection (oil pressure switch / thermo switch)

• 2.5 Thermostat inspection

• 2.6 Adjusting operation (procedure + running precautions)

• 2.7 Long storage

3. Troubleshooting

• Preparation before troubleshooting

• Quick reference chart

• Troubleshooting (engine & fuel injection equipment)

• Troubleshooting by measuring compression pressure (includes standard/limit values)

4. Disassembly and reassembly

• Precautions

• Tools (general, special tools, measuring instruments)

• Full disassembly & reassembly procedures

5. Inspection and servicing of basic engine parts

• Cylinder block (measurement/inspection procedures)

• Cylinder head (valves, seats, springs, assembly, valve clearance)

• Piston / pins / rings

• Connecting rod (clearances, bolt torque guidance)

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• Crankshaft & main bearing

• Camshaft & tappets

• Timing gear (timing marks)

• Flywheel & housing

6. Fuel injection equipment

• Fuel injection pump/governor (service data, timing, troubleshooting)

• Fuel feed pump (disassembly/reassembly + inspection)

  460753295-yanmar-3ym-2ym-servic…

• Fuel filter (specs/inspection)

• Fuel tank

7. Intake and exhaust system

• Intake system (breather/diaphragm inspection)

• Exhaust system (mixing elbow inspection)

8. Lubrication system

• Lubrication system overview

• Lube oil pump (specs, disassembly/reassembly, inspection)

• Lube oil filter

• Optional rotary waste oil pump

9. Cooling water system

• Cooling water system overview

• Seawater pump (specs, disassembly, inspection, reassembly)

• Fresh water pump (construction/specs/service)

• Heat exchanger (service & inspection)

• Pressure cap & coolant recovery tank

• Thermostat (function/testing)

• Optional bilge pump & bilge strainer

10. Reduction and reversing gear

• Specifications

11. Remote control (Optional)

• System construction & components

• Installation, inspection, adjustment

12. Electrical system

• Electrical system overview

• Wiring diagram

• Battery

• Starting motor

• Alternator 12V/60A (and optional 12V/80A)

• Instrument panel (B-type optional)

• Warning devices (oil pressure / temperature alarms)

• Glow plug

• Electric engine stopping device

13. Service standards

• Engine tuning

• Engine body service standards (head, cam/gear train, block)

• Lubricating oil system (trochoid pump)

14. Tightening torque for bolts and nuts

• Main bolt & nut

• Standard bolts and nuts (without lube oil)

📌 File Details

Skip the guesswork and repair it the factory way—this YANMAR 3YM30/3YM20/2YM15 manual gives you the specs, procedures, and diagrams you need. Buy now for instant download and get back on the water faster.