2016Q020_02gb

OPERATING INSTRUCTION Services, Wärtsilä Finland Oy Engine section 16 Injection system

Engine type

W20, W20DF

Ref. WFI–S

Date 24-Sep-2012

Issue 02

Document No. 2016Q020

Page 1(3)

Inspe nsp ection cti on of nozzle nozzle holde hold er se s ealing li ng surf s urfa ace This bulletin concerns WÄRTSILÄ® 20, 20DF and Auxpac 20 engines.

Engine type Note!

For W20DF engines these instructions instructions does not concern the pilot injection valve. The nozzle holder sealing surface should be inspected every time the nozzle is disman d ismantled tled from the injection valve:

General

Wear on the nozzle holder sealing surface increases increases the risk for leakage. Wear on the impact bush increases the needle stroke and may when exceeding the needle stroke limit eventually cause reduced nozzle lifetime and decreased fuel effeciency.

Fig. 1 Injection valve

Impact bush wear  L1 = Distance between the centre line of the t he bore for the t he connection piece and the surface where the nozzle is seated. B=

Recommendation

Inspect the nozzle holder sealing surface carefully and measure m easure the impact bush wear, follow the instructions on the next page. Replace the nozzle holder if the wear exceeds the specified limits. See chapter 16 in the engine instruction manual for reference.

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

Operating Instruction Issue 02

Inspection

Document No. 2016Q020

Page 2(3)

Measure the distance (L1) between the centre line of the bore for the connection piece and the surface where the nozzle is seated. This can be done e.g. using a depth caliper according to the method described below. Measure the distance from the nozzle holder sealing surface to the straight surface of a spare connection piece, mark the measuring point on the connection piece. Write down the result as distance L.

Fig. 2 Measuring distance L

Measure the diameter of the connection piece at the mark from the earlier measure (diameter varies becuase of manufacturing tolerances), write down the result as diameter D. Calculate L1 according to: L1 = L + D/2. Measure the impact bush wear (B) using e.g. measuring device 848 051.

Fig. 3 Measuring device 848 051 1.

B < 0.10 mm:

If the nozzle sealing surface is in good condition the nozzle holder can be accepted for further use. 2.

B > 0.10 mm:

If the distance L1  is less than 91.2 mm, the nozzle holder must be scrapped. If the distance L1  exceeds 91.2 mm the nozzle holder can be sent to an authorized workshop  for reconditioning.

Services, Wärtsilä Finland Oy

Operating Instruction Issue 02

Tools

Document No. 2016Q020

Ref type

Part number

Version

Descrip tion

W20

848 051

0001

Measuring device for injection nozzle needle lift

Page 3(3)

Ordering

Contact your closest Wärtsilä Services Network for further information about reconditioning the nozzle holders. Please specify the engine serial number(s) and part number(s).

Letter distribution

Wärtsilä Services Network and operators/owners of engines concerned.

Letter validity

Until further notice. Replacing issue 01, dated 21-Sep-2012.

Related doc uments

See also WS16Q010 Fuel injection valve maintenance.

 2012

Wärtsilä Finland Oy – All rights reserved

No part of this publication may be reproduced or copied in any f orm or by any means (electronic, mechanical, graphic, photocopying, recording, taping or other information retrieval systems) without the prior written permissi on of the copyright holder. Wärtsilä Finland Oy makes no representation, warranty (express or implied) in this public ation and assumes no responsibility for the correctness, errors or omissions for information contained herein. Information in this publication is s ubject 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 improv ement of the engine and/or the maintenance procedures relating t hereto. 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 LIA BILITY 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.