governor lube oil selection

8/18/2019 Governor Lube Oil Selection

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Service,

Wärtsilä Finland Oy Käyttöohje Driftsinstruktion

Engine section Engine type Ref. Date Issue Document No. Page22 Control Mechanism All engines WFI–S 08.08.2002 02 WV22Q107GB 1(4)

Wärtsilä Finland Oy P.O. Box 252 (Tarhaajantie 2) Telecop. +358 10 709 1847 Tel. +358 10 709 0000 Registered in Finland No. 465.942

Service, Vaasa FIN-65101 Vaasa, Finland Telecop. +358 6 356 7339 Registered Office: Vaasa

Wärtsi lä Finland Oy P O Box 50 (Stålarminkatu 45) Telecop +358 10 709 3279 Tel +358 10 709 0000

This Operating Instruction concerns all Wärtsilä engine types.

Woodward has experienced a problem with “oil lacquering” inside

governors. Oil lacquering is a deposit build up, which is diff icult to remove.The deposit may in the worst case cause the governor to malfunction.Woodward has therefore issued the enclosed Service Bulletin concerninghow to recognise, and how to avoid, oil lacquering.

The enclosed Service Bulletin serves as a complement to Wärtsilä enginemanuals, which also contain information concerning governor oil.

There is a similarity between hydro-mechanical governors and actuators.This instruction is therefore valid also for hydro-mechanical actuators.

Wärtsilä Service Network. Owners of Wärtsilä engines.

Until further notice.

Woodward Service Bulletin 01196

© 2002 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 pr 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.

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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Service, Wärtsilä Finland Oy Operating instruction

Issue Document No. Page00 00000000GB 2(2)


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SERVICE BULLETIN

Prevention of Oil Lacquering

in Hydro-mechanical Governors

February 2002 01196

Issue Hydro-mechanical governors can be affected by a condition known as oil“lacquering”. If not prevented, lacquering can lead to various possible failuremodes, with the potential for the governor to stick in the max fuel or min fuelposition.

WARNING Lacquering can lead to governor failure, with the

potential for engine overspeed. A vessel could be unableto maintain headway. Preventing lacquering, and having

a backup governing/safety system, are essential for

safety.Lacquering is difficult and time-consuming to remove (in some cases the costof cleaning a lacquered governor can be as high as 40% of the new price ofsuch a unit). This service bulletin describes Woodward Recommendations andCustomer Actions to avoid lacquering.

Description Lacquering is defined as the condition in which the governor is coatedinternally by a residue from the oil (often referred to as varnish or sludge). Thedeposits form a hard layer which is very difficult to remove. Lacquering isgenerally accompanied by a smell similar to burnt oil.

The results can range from sticking pilot valves to plugged oil passages andorifices.

Lacquering is generally caused by the oil breaking down, which can be caused

by:• too high an oil temperature;

• too long an interval between oil changes;

• water condensing inside the governor during cooldown periods (water inoil can cause hydrolysis which is a known failure mode for oils).

Oil selection is important, as some oils are less prone to lacquering thanothers. It is up to the plant operator/vessel owner and the oil supplier toestablish the correct oils and change intervals for each application. Such aselection should consider operating temperature, oil change interval, and otheroperating conditions known to the plant operator/vessel owner. A properselection can achieve suitable economies of cost and change interval whilealso preventing lacquering.

Affected Units Any governor can be affected, depending on oil change interval, operating

temperature, and oil type. Some governor types work their oils harder thanothers.


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WoodwardRecommendations

Woodward is not aware of the operating conditions of each application and canmake only certain general recommendations:

• Oil Temperature—Woodward recommends that the oil temperature forcontinuous operation be between 60 and 93 °C (140 and 200 °F). Referto Woodward manual 25071, Oils for Hydraulic Controls.

• Oil Change Interval—Because oil change interval must take intoconsideration all operating conditions, the correct oil change intervalmust be established between the plant operator/vessel owner and the oilsupplier.

• Oil Selection—Woodward specifies two essential factors that need to

be considered in the selection of an oil for proper governor operation: viscosity range—allowed is 7,5 cSt (50 SUS) to 650 cSt (3000

SUS); ideal is 20 cSt (100 SUS) to 65 cSt (300 SUS). operating temperature—recommended is an oil temperature for

continuous operation between 60 and 93 °C (140 and 200 °F).

Operating conditions of each application are outside Woodward control.Woodward considers that plant operators/vessel owners, in consultation withtheir oil suppliers, will be able to make a proper oil selection and will be able toestablish appropriate oil change intervals that consider each unique set ofoperating conditions. Failure to avoid lacquering of oil inside a governor isconsidered to be a misuse outside Woodward control. Such misuse is notcovered by Woodward warranty.

If a governor has become lacquered, it is imperative that this situation be

diagnosed and corrected as soon as possible. A lacquered governorshould not be used, since this can have serious consequences.

Customer Action Carefully consider the choice of governor oil with your oil supplier. Whenchoosing an oil interval, start with shorter than expected intervals and slowly trylonger intervals. Monitor the condition of the oil, especially the build-up ofdeposits, to ensure that the oil remains within the operating conditions definedby the oil supplier.

Woodward/Industrial ControlsPO Box 1519, Fort Collins CO 80522-1519, USA

1000 East Drake Road, Fort Collins CO 80525, USA

Phone +1 (970) 482-5811 • Fax +1 (970) 498-3058

E-mail and Home Page—www.woodward.com

FM 57982BS EN ISO 9001:19946 March 2001

Woodward has company-owned plants, subsidiaries, and branches,

as well as authorized distributors and other authorized service and sales facilities throughout the world.

Complete address/phone/fax/e-mail information for all locations is available on our website.

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governor lube oil selection

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