Review
Version 1
Preserved in Portico This version is not peer-reviewed
Varnish Formation and Removal in Lubrication Systems: A review
Version 1
: Received: 6 May 2023 / Approved: 8 May 2023 / Online: 8 May 2023 (05:04:38 CEST)
A peer-reviewed article of this Preprint also exists.
Hong, S.-H.; Jang, E.K. Varnish Formation and Removal in Lubrication Systems: A Review. Materials 2023, 16, 3737. Hong, S.-H.; Jang, E.K. Varnish Formation and Removal in Lubrication Systems: A Review. Materials 2023, 16, 3737.
Abstract
In this study, the literature on varnish contamination is investigated among the various con-taminations of lubricant. As the period of use of lubricant increases, the lubricant deteriorates and becomes contaminated. The varnish causes filter plugging, sticking of hydraulic valves and fuel injection pumps, obstruction of flow, reduction of clearance, poor heater and cooler perfor-mance, and increase of friction and wear in various lubrication systems. These problems also cause mechanical system failure, performance degradation, and increased maintenance and re-pair cost. To improve the problems causes by the varnish, an adequate understanding of varnish is required. Therefore, in this literature review, definitions and characteristics, generating ma-chinery, generating mechanisms, causes, measurement methods, and prevention or removal methods are summarized. Most of the data are reports of companies related to lubricant and machine maintenance, and are included in some papers. We hope that this summary of varnish will be helpful to those who are engaged in reducing or preventing varnish problems.
Keywords
varnish; lubricant; contamination; degradation; oxidation
Subject
Engineering, Mechanical Engineering
Copyright: This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Comments (0)
We encourage comments and feedback from a broad range of readers. See criteria for comments and our Diversity statement.
Leave a public commentSend a private comment to the author(s)
* All users must log in before leaving a comment