1992-10-01

Relationships Among Oil Composition, Combustion-Generated Soot, and Diesel Engine Valve Train Wear 922199

Oil formulation has been found to be a significant factor in high rates of 6.2 L diesel engine, roller hydraulic valve lifter wear that occurred in field service with some commercial engine oils. This was confirmed through engine-dynamometer testing. A correlation has been established between engine-dynamometer wear test results and those obtained in laboratory four-ball wear tests conducted with used engine oil. The effects of dispersant level, viscosity, sulfonate metal type, sulfonate total-base-number, zinc dialkyl dithiophosphate (ZDTP) type, and ZDTP concentration on wear were systematically investigated. Wear increased with increasing soot concentration in the oil, and decreased with increasing sulfur concentration, both in the oil and on the metal surface. Wear also decreased with increasing dispersant concentration. The remaining oil variables had minimal effects on wear within the ranges studied. Diesel engine wear occurs when soot either prevents antiwear film formation on metal surfaces, or removes the antiwear film shortly after formation.

SAE MOBILUS

Subscribers can view annotate, and download all of SAE's content. Learn More »

Access SAE MOBILUS »

Members save up to 18% off list price.
Login to see discount.
Special Offer: Download multiple Technical Papers each year? TechSelect is a cost-effective subscription option to select and download 12-100 full-text Technical Papers per year. Find more information here.
We also recommend:
TECHNICAL PAPER

Effects of Engine Oil Additives and Carbon Particles on Valve Train Wear of Diesel Engines

831759

View Details

TECHNICAL PAPER

Lubricants That Optimize Diesel Engine Fuel Economy and Allow Extended Oil Drains

2001-01-1968

View Details

TECHNICAL PAPER

“Hot Tube Test”-Analysis of Lubricant Effect on Diesel Engine Scuffing

840262

View Details

X