DefinePK

Abstract

Extreme friction often occurs in engine components, causes energy loss and reduces the lifespan of the engine. Changing the engine lubricating oil according to scheduled maintenance may reduce the chances of engine breakdown. In this study, an apparatus to test the effectiveness of the engine lubricating oil was developed. It has a special feature that able to test the lubricating performance when subjected to journal bearing abrasion or camshaft-rocker arm abrasion. The experimental procedure was adopted from the ASTM D2782-02 (Timken Test method). Commercially available small engine lubricant oil with an SAE viscosity grade of 20w-40 (mineral-type) from three different manufacturers were tested. In the first experiment, dead weight of 1-10 kilograms were loaded to investigate the effectiveness of the test lubricant oil against extreme pressure. The second and third experiments were on the erosion measured due to abrasion of journal bearings and camshaft intake lobe respectively. Different lubrication performances were found even though the tested oils had the same viscosity grade.