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Effects of Engine Oil Supply on Rocker Arm and Ball Wear
Annotation ability available
Sector:
Event:
Fleet Week
Language:
English
Abstract
Wear of engine components is affected by lubricant quality and flow and by the metallurgy of the rubbing parts. Recent studies have shown that after starting an engine at sub-zero temperatures, more than 6 min elapsed before oil reached all of the rocker arm assemblies of a V-8 engine. Since this could have an adverse effect on rocker arm and ball wear, the effects of intermittent and zero oil flow on rocker arm and ball wear were investigated. The metallurgy of the rocker balls influenced ball wear greatly. Even when run for 9 h with no oil flowing to them, sintered iron alloy balls had very little scuffing or wear, whereas sintered iron balls were heavily scuffed and worn. In addition, the impregnant used in sintered iron alloy balls influenced wear. With one type of organophosphorus impregnant, excessive scuffing and wear was observed, whereas with another organophosphorus and an oleic acid impregnant, little wear and no scuffing were found.
Authors
Citation
Murphy, C., "Effects of Engine Oil Supply on Rocker Arm and Ball Wear," SAE Technical Paper 740540, 1974, https://doi.org/10.4271/740540.Also In
References
- Smith, M. F. Jr. Graham J. P. “Pumpability of Multigrade Engine Oils at Low Temperatures.” SAE Transactions 80 1971 paper 710139
- Murphy C. K. Green W. A. “Discussion of ‘Pumpability of Multigrade Engine Oils at Low Temperatures’ by M. F. Smith, Jr. and J. P. Graham.” SAE Transactions 80 1971
- Report of Subsection B-3 on Low Temperature Flow of Engine Oils Research Division VII of ASTM Committee D-2 Atlanta December 1971
- Stewart R. M. Spohn C. R. “Some Factors Affecting the Cold Pumpability of Crankcase Oils.” SAE Transactions 81 1972 paper 720150