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Service,Wrtsil Finland Oy Tekninen tiedote Teknisk bulletinEngine section Engine type Ref. Date Issue Document No. Page

11 Crank Mechanism W20 WFIS 16.01.2004 01 2011T004GB 1(2)

Wrtsi l Finland Oy P.O. Box 252 (Tarhaajant ie 2) Telecop. +358 10 709 7355 Tel. +358 10 709 0000 Business ID 0773744-3Service, Vaasa FIN-65101 Vaasa, Finland Telecop. +358 6 356 7339 Registered Office: Vaasa

Wrtsi l Finland Oy P.O. Box 50 (Stlarminkatu 45) Telecop. +358 10 709 3279 Tel. +358 10 709 0000Service, Turku FIN-20811 Turku, Finland Telecop. +358 10 709 3410

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Connecting rod screws for WRTSIL 20,replacement interval and new revision

Engine type This Technical Bulletin concerns all WRTSIL

20 engines independentof fuel oil used or operating profile.

General The reasons for the Technical Bulletin

As a safety precaution, Wrtsil has stipulated replacement intervals forthe WRTSIL 20 connecting rod screws.

The connecting rod screw for WRTSIL 20 has been revised tomake maintenance more convenient.

Recommendation, replacement interval

The replacement of the connecting rod screws is recommended to take

place at the latest every 24000 operating hours. Replacement of theconnecting rod screws can be justified with fewer operating hours in orderto be in line with normal piston overhaul intervals and thus avoidunnecessary opening/tightening of the connecting rod big end.

Special notes:

The connecting rod screw replacement interval recommendation isindependent of the screw revision.

The nuts for the connecting rod screws do not need to be replaced,

unless they appear damaged. Clean and examine the nuts carefully atevery piston overhaul.

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Service,Wrtsil Finland Oy Technical bulletinIssue Document No. Page01 2011T004GB 2(2)

Connecting rod screw characteristics

The previous connecting rod screw had an end plug, the new standardconnecting rod screw is without end plug. Both screws are illustrated belowand the nominal length is as a reference to recognize the difference.

The new connecting rod screw without the end plug was introduced in themiddle of 2003 and will replace the one with an end plug.

Recommendation, connecting rod screw

For proper assembly of the connecting rod screws see OperatingInstruction 2011Q002, Assembly procedure for the connecting rod bigend, which also includes chapter 11 from the Engine Instruction Manual.

Caution!

An end plug may under no circumstances be used with the newtype of connecting rod screw.

Check that no plug remains in the threaded holes of theconnecting rod before mounting the screws.

Warranty Unless otherwise expressly set forth, no recommendation contained in thisdocument is to be construed as provided due to a defect in the engine, butmerely as an improvement of the engine and/or the maintenanceprocedures relating thereto. Any actions by the owner/operator as a result

of the recommendations are not covered under any warranty provided byWrtsil and such actions will thus be at the owners/operators own cost andexpense.

Letter distribution Wrtsil Service Network and owners / operators of WRTSIL 20engines.

Letter validity Until further notice.

2004 Wrtsil Finland Oy All rights reserved

No Part of this publication may be reproduced or copied in any form or by any means (electronic, mechanical, graphic, photocopying,recording, taping or other information retrieval systems) without the prior written permission of the copyright holder. Wrtsil Finland Oymakes no representation, warranty (express or implied) in this publication and assumes no responsibility for the correctness, errors oromissions for information contained herein. Information in this publication is subject to change without notice.

NO LIABILITY WHETHER DIRECT, INDIRECT, SPECIAL, INCIDENTAL OR CONSEQUENTIAL, IS ASSUMED WITH RESPECT TO THEINFORMATION CONTAINED HEREIN. THIS PUBLICATION IS CONFIDENTIAL AND INTENDED FOR INFORMATION PURPOSESONLY.