J. A. McGeehan

Camshaft surface temperatures in fired-gasoline engines

The authors of this paper measured camshaft surface temperatures in to different gasoline engines: a Ford 2.3-litter overhead-camshaft engine with finger-follower and an Oldsmobile V-8 5.7-liter engine with rotating tappets and pushrods. Using unique surface thermocouples in the cam-lobes, we found that maximum cam-lob temperature occur at the cam-nose and increase linearly with speed and oil temperature. At high speed, the rotating tappet produced lower temperatures that the finger-follower. In addition, at maximum speed the cam-lobe temperatures in the ASTM Sequence V-D and IIID tests were similar--200{degrees} C. The similarity in these surface temperatures explains why both engines require similar zinc dithiophosphates (SnDTP) for wear control. The surface temperature controls the surface chemistry.

The effects of piston temperature and fuel sulfur on diesel engine piston deposits

Influence de la temperature du piston et du soufre contenu dans le carburant sur les depots sur les pistons des moteurs diesel

Mechanism of Wear Control by the Lubricant in Diesel Engines

At todays low oil consumption rates, high speed diesel engines with chromium-faced rings have experienced corrosive wear problems. This report defines the alkalinity required to prevent these wear problems; and the appropriate oil drain interval. In addition, the mechanisms of chromium-faced ring wear are identified. The study is based on three different engine types - direct injection two-cycle (DDA 8V-71TA), direct injection four-cycle (Mack ETAZ 673), and precombustion chamber four-cycle (Caterpillar 1Y73).

Performance of 1.0% and 1.45% Ash - SAE 15W-40 Oils in On-Highway Trucks With Cummins, Caterpillar, and Mack Engines

The performances of 1.0% and 1.45% ash, SAE 15W-40--CE/SF oils were compared in on-highway trucks with Cummins, Caterpillar, and Mack engines. The 300,000-mile (482,803-km) field test demonstrated that mixed diesel engine fleets can get maximum engine life to overhaul using a high quality, CE/SF, 1.0% ash--SAE 15W-40 oil

Field performance of SAE 15W-40 multigrade oils in DDA 8V-92 engines using current and new piston fire rings

Performances mesurees par essais routiers des huiles multigrades SAE 15W-40. Essais sur les moteurs Detroit Diesel Allison 8V92 avec des segments coupe-feu de conception ancienne et nouvelle