Yanmar Marine Engine Service Manual (EN)

Cover

M9961-03E101 3YM30/3YM20/2YM15

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History of Revision

Printed in Japan M9961-03E101 R1 Publication No. M9961-03E101 History of Revision Manual Name Service Manual for Marine Diesel Engine Engine Model: 3YM30/3YM20/2YM15 Number of revision Date of revision Reason for correction Outline of correction Correction item No (page) Corrected by New edition March 2004 R1 April 25, 2005 Add : Eug. Model 2YM15 1. Specifications table added. 2. Engine outline added. 3. Piping diagram added. 4. Other data added. Quality Control Dept. Marine Factory Corrected data. (3YM30, 3YM20) 1. Front cover added to engine outline. 2. Notice on seawater pump rotating direction was changed. 3. Incorrect word corrected. P.6-P.9 P.32

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FOREWORD

FOREWORD This service manual has been complied for engineers engaged in sales, service, inspection and maintenance. Accordingly, descriptions of the construction and functions of the engine are emphasized in this manual, while items, which should already be common knowledge, are omitted. One characteristic of a marine diesel engine is that its performance in a vessel is governed by the applicability of the vessel's hull construction and its steering system. Engine installation, fitting out and propeller selection have a substantial effect on the performance of the engine and the vessel.

Moreover, when the engine runs unevenly or when trouble occurs, it is essential to check a wide range of operating conditions - such as installation to the full and suitability of the ship's piping and propeller - and not just the engine itself. To get maximum performance from this engine, you should completely understand its functions, construction and capabilities, as well as proper use and servicing. Use this manual as a handy reference in daily inspection and maintenance, and as a text for engineering guidance. Model 3YM30 has been used for the illustrations in this service manual, but they apply to other models in the 3YM series engines.

California Proposition 65 Warning California Proposition 65 Warning Diesel engine exhaust and some of its constituents are known to the State of California to cause cancer, birth de- fects, and other reproductive harm. Battery posts, terminals, and related ac- cessories contain lead and lead com- pounds, chemicals known to the State of California to cause cancer and repro- ductive harm. Wash hands, after handling. 2005 YANMAR CO., LTD All rights reserved. This manual may not be reproduced or copied, in whole or in part, without the written permission of YANMAR CO., LTD. c R1

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CONTENTS

CONTENTS 1.

General ............................................................................................................................1 1.1 Exterior views ...........................................................................................................................1 1.2 Specifications ...........................................................................................................................2 1.3 Fuel oil, lubricating oil and cooling water .................................................................................4 1.3.1 Fuel oil ..............................................................................................................................................

4 1.3.2 Lubricating oil.................................................................................................................................... 4 1.3.3 Cooling water....................................................................................................................................

5 1.4 Engine outline ..........................................................................................................................6 1.5 Piping diagrams .....................................................................................................................10 1.6 Exhaust gas emission regulation ...........................................................................................12 1.6.1 Engine identification (EPA/ARB)..................................................................................................... 12 1.6.2 Exhaust gas emission standard (EPA/ARB)...................................................................................

13 1.6.3 Guarantee conditions for emission standard (EPA/ARB) ............................................................... 13 2. Inspection and adjustment .............................................................................................15 2.1 Periodic maintenance schedule .............................................................................................15 2.2 Periodic inspection and maintenance procedure ...................................................................17 2.2.1 Check before starting......................................................................................................................

17 2.2.2 inspection after initial 50 hours or one month operation ................................................................. 20 2.2.3 Inspection every 50 hours or monthly............................................................................................. 25 2.2.4 Inspection every 100 hours six months........................................................................................... 30 2.2.5 Inspection every 150 hours or one year.......................................................................................... 30 2.2.6 Inspection every 250 hours or one year..........................................................................................

31 2.2.7 Inspection every 1,000 hours or four years..................................................................................... 37 2.3 Adjusting the no-load maximum or minimum speed ..............................................................44 2.4 Sensor Inspection ..................................................................................................................44 2.4.1 Oil pressure switch.......................................................................................................................... 44 2.4.2 Thermo switch.................................................................................................................................

44 2.5 Thermostat inspection ............................................................................................................45 2.6 Adjusting operation ................................................................................................................46 2.6.1 Preliminary precautions .................................................................................................................. 46 2.6.2 Adjusting operation procedure........................................................................................................ 46 2.6.3 Check points and precautions during running.................................................................................

47 2.7 Long storage ..........................................................................................................................48 3. Troubleshooting .............................................................................................................49 3.1 Preparation before troubleshooting ........................................................................................49 3.2 Quick reference chart for troubleshooting ..............................................................................50 3.3 Troubleshooting (Concerning engine and fuel injection equipment) ......................................59

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