Importance of Proper Valve Lash Setting (AFA)
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Engine News Importance of Proper Valve Lash Setting {1102, 1121, 1123} SMCS - 1102; 1121; 1123 Engine: All 3500 Engines Correct valve lash settings help provide the following benefits: Optimum performance Economical fuel consumption Contributes to maximizing the service life of related parts Maintaining rated exhaust emissions A minor error in the valve lash setting may not cause immediate damage. However, the error will contribute to reduced performance and fuel economy. Incorrect valve lash setting can cause the following conditions: Excessive valve lash causes the valves to seat at higher velocities that can exceed the design capabilities of the valves, resulting in broken valves. Insufficient valve lash can prevent the valves from seating. Possible results are burnt valves and contact of the valves with pistons. Insufficient exhaust valve lash opens the valve prior to completion of the power stroke. Some of the combustion occurs in the exhaust system instead of the combustion chamber. Cylinder pressure is reduced, resulting in a loss of power and boost. Because of reduced power and boost, the operator may increase the throttle, which increases fuel consumption in order to do the same amount of work. Inspect the valve lash and adjust the valve lash according to the Operation and Maintenance Manual, "Maintenance Interval Schedule". For instructions for measuring the valve lash and setting the valve lash, refer to the engine Testing and Adjusting. Media Number -SEBD9816-00 Publication Date -04/10/2012 Date Updated -04/10/2012 i05103969 Copyright 1993 - 2015 Caterpillar Inc. All Rights Reserved. Private Network For SIS Licensees. Thu May 7 15:30:52 UTC-0400 2015 Página 1 de 1 07/05/2015 Valve recession occurs normally due to engine operation. Valve recession decreases the valve lash setting, which makes initial and regular scheduled maintenance of the setting necessary.
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Importancia del correcto ajuste de válvulas
Transcript of Importance of Proper Valve Lash Setting (AFA)
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Engine News
Importance of Proper Valve Lash Setting {1102, 1121, 1123}SMCS - 1102; 1121; 1123
Engine: All 3500 Engines
Correct valve lash settings help provide the following benefits:
Optimum performance
Economical fuel consumption
Contributes to maximizing the service life of related parts
Maintaining rated exhaust emissions
A minor error in the valve lash setting may not cause immediate damage. However, the error willcontribute to reduced performance and fuel economy.
Incorrect valve lash setting can cause the following conditions:
Excessive valve lash causes the valves to seat at higher velocities that can exceed the designcapabilities of the valves, resulting in broken valves.
Insufficient valve lash can prevent the valves from seating. Possible results are burnt valves andcontact of the valves with pistons.
Insufficient exhaust valve lash opens the valve prior to completion of the power stroke. Some of thecombustion occurs in the exhaust system instead of the combustion chamber. Cylinder pressure isreduced, resulting in a loss of power and boost.
Because of reduced power and boost, the operator may increase the throttle, which increases fuelconsumption in order to do the same amount of work.
Inspect the valve lash and adjust the valve lash according to the Operation and Maintenance Manual,"Maintenance Interval Schedule".
For instructions for measuring the valve lash and setting the valve lash, refer to the engine Testing andAdjusting.
Media Number -SEBD9816-00 Publication Date -04/10/2012 Date Updated -04/10/2012
i05103969
Copyright 1993 - 2015 Caterpillar Inc.All Rights Reserved.Private Network For SIS Licensees.
Thu May 7 15:30:52 UTC-0400 2015
Pgina 1 de 1
07/05/2015
Valve recession occurs normally due to engine operation. Valve recession decreases the valve lash setting,which makes initial and regular scheduled maintenance of the setting necessary.
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