REPUBLIC OF SERBIA

MINISTRY OF DEFENCE

www.mod.gov.rs

MINISTRY OF DEFENCE

Material Resources Sector

Defensive Technologies Department

Military Technical Institute

www.vti.mod.gov.rs

experimental investigation of oils in four-stroke engines

sreten perić

University of Defence, Military Academy, Pavla Jurišića Šturma Str. No. 33, 11000 Belgrade, sretenperic@yahoo.com

bogdan nedić

University of Kragujevac, Faculty of Engineering, 6 Sestre Janjic Street, 34 000 Kragujevac, nedic@kg.ac.rs

Abstract: Confirming the basic causes of failures and their elimination, control of certain phenomena, is defining proactive maintenance, as a new method that reduces maintenance costs and prolongs the life of assets. Determination of tribomehanical systems condition has very important role in development of friction theory and practice, wear and lubrication. There are used today different physical and chemical methods and tribology methods for tribomehanical system diagnosis. Experience in technical systems exploitation shoved that the most effective failure prognosis is according to parameters, particles created as result of wear, which are reliable indicators of wear. Analysis of oil samples which contain particles, created as results of wear, enable evaluation of system tribology condition in different phases of system exploitation.

The paper presents the physical chemical tests in the analysis of oils that are used for the assessment of his condition. Furthermore, the results of experimental research on the physical chemical characteristics of the oil sampled from engines of the vehicles (PUCH 300GD, PINZGAUER 710M and IK 104) are shown. All of these vehicles were in regular use by the Serbian armed forces.

The performed research has revealed some significant changes in the physical chemical characteristics of oil for engine lubrication. These changes directly depend on the condition of the entire engine elements, i.e. depend on their functional characteristics. The research results are originating from the research of the paper authors.

Keywords: Monitoring, Analysis oils, Lubrication systems, Proactive maintenance, Diagnosis.