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Connecting rod handling and inspection

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SERVICE
LETTER
Services, Wärtsilä Finland Oy
Engine section
Engine type
Ref.
Date
Issue
Document No.
11 Crank mechanism
See list
WFI–S
25.06.2007
01
3211S085
Page
1(2)
Connecting rod handling and inspection
Engine type
This bulletin concerns WÄRTSILÄ® Vasa 32, 32LN, WÄRTSILÄ® 32,
32GD, 32LNGD, 32DF, 34SG and W34SG engines.
General
The connecting rod is one of the most vital parts of the engine. Operating
with a damaged connecting rod puts the operators and engine at risk and
must be avoided. Any surface damages may lead to stress concentrations
and eventually connecting rod failure.
Handling
When handling connecting rods during e.g. overhauls or transport, care
must be taken not to dent or scratch any surfaces.
Handle the components carefully. Do not drop them or allow them to hit
anything during moving or lifting.
Hydraulic lock
If water is present in the cylinder or the receiver during a starting attempt, it
may cause a hydraulic lock that bends the connecting rod. If there are
indications that there is water in the cylinder(s) or the receiver, the engine
must not be started until the fault is found and corrected.
Recommendation
When overhauling, check for damages. Small dents on the connecting
rod shank (areas marked with red dotted lines (……) in the illustration
above) can be repaired according to the instructions on next page.
Always follow the starting procedure as described in the engine manual,
chapter 03.2.
If hydraulic lock is suspected, the affected connecting rods should be
removed from the engine and checked for straightness.
Contact your closest Wärtsilä Service Network for further advice if
necessary.
Wärtsilä Finland Oy
Services, Vaasa
P.O. Box 252 (Tarhaajantie 2)
FIN-65101 Vaasa, Finland
Telecop. +358 10 709 1847
Telecop. +358 10 709 1380
Tel. +358 10 709 0000
Wärtsilä Finland Oy
Services, Turku
P.O. Box 50 (Stålarminkatu 45)
FIN-20811 Turku, Finland
Telecop. +358 10 709 3279
Telecop. +358 10 709 3410
Tel. +358 10 709 0000
Business ID 0773744-3
Registered Office: Vaasa
Services, Wärtsilä Finland Oy
Service Letter
Issue
01
Inspection
Document No.
3211S085
Page
2(2)
All connecting rods in the engine to be visually checked.
If dents are found, do a magnetic particle inspection of the dents.
If cracks are found, the connecting rod upper part / complete
connecting rod must be changed.
If no cracks are found, the dents to be repaired according to the
repair instructions below.
Repair instructions
Note!
1. Check the depth of the damage, damages less than 1 mm deep can be
repaired.
All damages over 1 mm deep must be individually approved by Wärtsilä
Finland Oy, Technical Service, before repairing.
2. Grind and polish the area with the defect according to the sketch below.
3. Do a magnetic particle inspection after polishing the area with the
damage.
If cracks are found, the connecting rod upper part / complete
connecting rod must be changed.
4. Clean carefully. It is of utmost importance that the connecting rod is
properly protected during, and cleaned after the inspection and repair.
Letter distribution
Wärtsilä Service Network and owners/operators of engines concerned.
Letter validity
Until further notice.
2007 Wärtsilä 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. Wärtsilä Finland Oy makes no
representation, warranty (express or implied) in this publication and assumes no responsibility for the correctness, errors or omissions for
information contained herein. Information in this publication is subject to change without notice.
Unless otherwise expressly set forth, no recommendation contained in this document is to be construed as provided due to a defect
in the engine, but merely as an improvement of the engine and/or the maintenance procedures relating thereto. Any actions by the
owner/operator as a result of the recommendations are not covered under any warranty provided by Wärtsilä and such actions will
thus be at the owners/operators own cost and expense.
NO LIABILITY WHETHER DIRECT, INDIRECT, SPECIAL, INCIDENTAL OR CONSEQUENTIAL, IS ASSUMED WITH RESPECT TO THE
INFORMATION CONTAINED HEREIN. THIS PUBLICATION IS CONFIDENTIAL AND INTENDED FOR INFORMATION PURPOSES ONLY.
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