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The JDQ 78A John Deere procedure, which simulates full-load field applications, evaluates the high-temperature, full-load performance of diesel engine oil in a John Deere 4045T emissions-certified engine.

JDQ 78A Diesel Engine Oil  Equipment and Procedure

A John Deere 4045T four-cylinder, 4.5-liter, four-cycle, turbocharged diesel engine with power rated at 93 kW at 2,400 rpm is used. The 400-hour test cycle consists of two parts: a 10-hour break-in period, followed by 390 hours of full-load operation at a sump temperature of 135 °C.

JDQ 78A Procedure Results

By recording performance, analyzing oil samples, and rating the engine parts, oil performance is evaluated through measurement of:

• Oxidation stability

• Total base number (TBN) depletion

• Wear performance

• Piston deposits

• Oil consumption

The lubricant is analyzed for the following elements:
 

Pistons are rated for deposits using the modified CRC diesel piston rating system, and linear profilometer traces are made of used:

• Cam lobes

• Cam followers

• Cylinder liners

• Piston rings

• The following are weighed:

• Rod bearings

• Tappets

• Piston rings

For more information about the JDQ 78A diesel engine oil procedure capabilities at Southwest Research Institute (SwRI) or how you can contract with SwRI, please e-mail Perry A. Grosch, or call (210) 522-2815.
 

| Engine Lubricants Research Department | Fuels and Lubricants Research Division | SwRI Home |

Southwest Research Institute® (SwRI®), headquartered in San Antonio, Texas, is a multidisciplinary, independent, nonprofit, applied engineering and physical sciences research and development organization with 11 technical divisions.

September 06, 2007