SOOT AND VALVE TRAIN WEAR IN PASSENGER CAR DIESEL ENGINES
The effect of the use of the EGR system on the lubrication of a passenger car diesel engine was investigated. The higher the EGR rate, the more soot in the oil. And the most detrimental effect was found in valve train wear. Some engine tests, including motoring tests, were carried out to investigate the contribution of soot to valve train wear. The mechanism of cam and rocker arm wear in used oils was studied by analyzing for elements on the lubricated metal surface and subsequently the mechanism was more thoroughly studied using the four-ball test. Soot seems to act as an abrasive on the anti-wear solid film formed by the oil on the metal surface and this film contains Ca, O, P and S. Some hardware modifications and oil formulations to reduce valve train wear are also discussed.
- Find a library where document is available. Order URL: http://worldcat.org/issn/01487191
- Reprinted from SP-558 Lubricant and Additive Effects on Engine Wear. Fuels and Lubricants Meeting San Francisco, California, October 31-November 3, 1983.
Warrendale, PA United States 15096
- Nagai, I
- Endo, H
- NAKAMURA, H
- Yano, H
- Publication Date: 1983
- Features: Figures; References;
- Pagination: 20 p.
- TRT Terms: Camshafts; Diesel engines; Durability tests; Engine oils; Exhaust gas recirculation; Fly ash; Machine valves; Wear
- Uncontrolled Terms: Soot
- Old TRIS Terms: Valve train
- Subject Areas: Safety and Human Factors;
- Accession Number: 00387427
- Record Type: Publication
- Source Agency: National Highway Traffic Safety Administration
- Report/Paper Numbers: SAE 831757 Reprint, HS-036 784
- Files: HSL, USDOT
- Created Date: Aug 30 1984 12:00AM