EN3YM20/3YM 30MARINE DIESEL ENGINEMODEL:2YM15/3YM20/3YM30OPERATION MANUALThe 2YM15/3YM20/3YM30 is an EPA Certified Engine.It meets the low emission st

102. PRODUCT EXPLANATIONENDETAIL OF NAMEPLATEThe nameplate shown below is attached to the engine. Check the engine's model, output, rpm and seria

2. PRODUCT EXPLANATION11EN2.2 Engine SpecificationsNote: Fuel condition: Density at 15 ºC = 0.842Rating condition ISO 3046-1, at fuel temp. 25°C ; I

122. PRODUCT EXPLANATIONENNote: Fuel condition: Density at 15 ºC = 0.842Rating condition ISO 3046-1, at fuel temp. 25°C ; ISO 3046-1, at fuel temp.

2. PRODUCT EXPLANATION13ENMarine gear or Sail DriveModel Unit KM2P-1(S) KM2P-1(G) KM2P-1(GG) SD20 (coupled at boat builder)Type - Mechanical cone clut

142. PRODUCT EXPLANATIONEN2.3 Names of Parts2YM15Operation SideA Intake silencer F Oil filler capB Intake manifold G Fuel feed pumpC Fuel filter H Lub

2. PRODUCT EXPLANATION15EN3YM20Operation SideA Intake silencer F Oil filler capB Intake manifold G Fuel feed pumpC Fuel filter H Lubricating oil filte

162. PRODUCT EXPLANATIONEN3YM30Operation SideA Intake silencer F Oil filler capB Intake manifold G Fuel feed pumpC Fuel filter H Lubricating oil filte

2. PRODUCT EXPLANATION17EN2.4 Major Service of PartsName of part FunctionFuel filterRemoves dirt and water from fuel. Drain the filter periodically. T

182. PRODUCT EXPLANATIONEN2.5 Control EquipmentThe equipment in the control room, mak-ing remote control possible, consists of the instrument panel, w

2. PRODUCT EXPLANATION19EN2.5.1.2 MetersB type panels use analog electric systems and have a pointer indicator.2.5.1.3 Alarm equipment (lamps and buzz

ENINTRODUCTION ... 31. FOR YOUR SAFETY ... 41.1 Warning Symbols ...

202. PRODUCT EXPLANATIONEN2.5.2 Single Lever Remote Control HandleThis remote control system uses a single-handle to operate the marine gear-clutch (n

3. OPERATION21EN3. OPERATION3.1 Fuel Oil, Lubricating Oil, and Cooling Water3.1.1 Fuel OilOnly use the recommended fuel to ob-tain the best engine per

223. OPERATIONEN(3) Fuel TankThe inside of the fuel tank should al-ways be clean enough and it should be dry for the first use. Drain the water accord

3. OPERATION23ENDO NOT use The following engine oils.API : CG-4, CH-4ACEA : E-1, E-2, B gradeJASO : DH-2, DL-1Reason• API CG-4, CH-4In case CG-4, CH-4

243. OPERATIONEN3.1.3 Cooling fresh waterUse clean soft water and always be sure to add LLC (Long Life Coolant) in order to prevent rust built up and

3. OPERATION25EN3.2 Before Initial OperationPerform the following before using the en-gine for the first time:3.2.1 Supply Fuel Oil(1) Before filling

263. OPERATIONEN3.2.4 Supply Cooling WaterSupply cooling water according to the fol-lowing procedures. Be sure to add anti-freeze to the cooling water

3. OPERATION27EN(3) Pour cooling water slowly into the fresh water/coolant tank so that air bubbles do not develop. Pour until the water overflows fro

283. OPERATIONEN(6) When the key switch is turned, the engine will begin cranking. Contin-ue cranking for about 5 seconds, and check for abnormal nois

3. OPERATION29EN(2) Checking and Re-supplying Fuel OilCheck the fuel level inside the fuel tank and supply with the recommend-ed fuel, if necessary. (

3ENINTRODUCTIONThis Operation Manual describes the operation, maintenance and inspection of the 2YM15/3YM20/3YM30Yanmar Marine Diesel Engines.Read thi

303. OPERATIONEN(7) Check the Alarm Devices Electric OperationWhen operating the key switch, check that the alarm devices work normally. (See 2.5.1 (4

3. OPERATION31ENTurn the key for a maximum of 15 seconds in the start position. If the engine does not start the first time, wait for about 15 seconds

323. OPERATIONENThe engine will seize if it is operat-ed when cooling seawater dis-charge is too small or if load is applied without any warming up op

3. OPERATION33EN(5) Is there water, oil, or gas leakage, or are there any loose bolts?Check the engine room periodically for any problems.(6) Is there

343. OPERATIONEN3.4 Long Term Storage(1) In cold temperatures or before long term storage, be sure to drain the seawater from the seawater cooling sys

3. OPERATION35EN(3) Carry out the following periodic in-spection before placing the engine in storage. Clean the outside of the engine wiping off any

364. MAINTENANCE AND INSPECTIONEN4. MAINTENANCE AND INSPECTION4.1 General Inspection Rules(1) Conduct Periodic Inspection for Your Safety.The function

4. MAINTENANCE AND INSPECTION37ENApply the following tightening torque to bolts having "7" on the head. (JIS strength classification: 7T) Ti

384. MAINTENANCE AND INSPECTIONEN|: check : Replace z: Consult local dealerSystem ItemBefore start-ingInitial 50 hrsEvery 50 hrs or monthly[1] Every

4. MAINTENANCE AND INSPECTION39EN4.3 Periodic Inspection Items4.3.1 Inspection on Initial 50 Hrs. of Operation (or after 1 Month)(1) Replace the Engin

41. FOR YOUR SAFETYEN1. FOR YOUR SAFETY1.1 Warning SymbolsMost operation, maintenance and inspec-tion problems arise due to users' failure to com

404. MAINTENANCE AND INSPECTIONEN(6) Adjusting the Remote Control Ca-bleThe various control levers on the en-gine side are connected to the remote con

4. MAINTENANCE AND INSPECTION41EN(7) Adjusting the Tension of Alternator Driving BeltWhen there is not enough tension in the V-belt, it will slip and

424. MAINTENANCE AND INSPECTIONEN1. Check the fuel level in the fuel tank. Replenish if Insufficient2. Loosen the air bleeding bolt at the top of the

4. MAINTENANCE AND INSPECTION43EN(Battery fluid tends to evaporate in high temperatures, especially in sum-mer. In such cases, inspect the battery ear

444. MAINTENANCE AND INSPECTIONEN(3) Replace the Lubricating Oil Filter (See 4.3.1 (1))(4) Adjusting the Tension of the Alter-nator Driving Belt (See

4. MAINTENANCE AND INSPECTION45ENcareful to turn it in the correct direc-tion. Incorrect turning will twist the impeller and damage it(7) Clean the Ex

464. MAINTENANCE AND INSPECTIONEN1. When the diaphragm is damaged, crankcase pressure control is affect-ed. Excessive crankcase pressure will cause le

4. MAINTENANCE AND INSPECTION47ENEven if LLC (Long Life Coolant) or an-tirust is added, the cooling water must be replaced periodically because the pr

484. MAINTENANCE AND INSPECTIONEN(5) Quality guarantee period for the emission related partsIf the schedule of periodic maintenance outlined in 4.4.3

5. TROUBLE AND TROUBLESHOOTING49EN5. TROUBLE AND TROUBLESHOOTINGNote: Other warning lamps do not light up when the switch is turned on. They only lig

1. FOR YOUR SAFETY5EN1.2 Safety Precautions(Observe these instructions for your own safety!)Precautions for OperationFiller Cap of Coolant TankNever o

505. TROUBLE AND TROUBLESHOOTINGENTrouble Probable Cause Measure ReferenceStarting FailuresStarter turns, but engine does not startNo fuel. Replenish

5. TROUBLE AND TROUBLESHOOTING51ENWARRANTY SERVICEOwner SatisfactionYour satisfaction and goodwill are impor-tant to us and to your dealer.Normally an

526. PIPING DIAGRAMSEN6. PIPING DIAGRAMSSee Appendix A. at the back of this manual.NotationRH Rubber hoseSGP STS Steel PipeScrew joint (Union)Flange J

7. WIRING DIAGRAMS53EN7. WIRING DIAGRAMSSee Appendix B. at the back of this manual.Color codingR RedB BlackW WhiteL BlueRB Red/BlackLB Blue/BlackYW Ye

• MANUFACTURER’S DECLARATION FOR MACHINERY PARTS ACCORDING TO 94/25/EEC(ANNEX-15) & 89/336/EEC • MANUFACTURER: YANMAR CO., LTD. 1-32, Chayam

President, Yanmar Marine Int’l

President, Yanmar Marine Int’l

61. FOR YOUR SAFETYENMoving PartsDo not touch or let your clothing get caught in the moving parts of the engine, such as the front drive shaft, V-belt

1. FOR YOUR SAFETY7ENScaldsWhen extracting oil from the engine while it is still hot, don't let the oil splash on you.Wait until the temperature

81. FOR YOUR SAFETYEN1.3 Warning LabelsSafety Precautions for InspectionTo insure safe operation, warning device labels have been attached. Their loca

2. PRODUCT EXPLANATION9EN2. PRODUCT EXPLANATION2.1 Use, Propulsion System, Etc.The engine is equipped with a marine gear or a sail drive unit. The mar