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Specifications This procedure covers specification CF & CF-2 API categories. Objective The objective of this procedure is to evaluate the performance of crankcase lubricants with respect to piston deposits, ring sticking, ring and cylinder wear as well as piston, ring and liner scuffing. Field service simulated High-speed, supercharged off-highway heavy-duty diesel engine service is simulated. Procedure fixture A Caterpillar 1Y73 single-cylinder indirect injection diesel procedure engine with a two-valve arrangement having a 5.125 in. bore and a 6.5 in. stroke resulting in a displacement of 134.1 cubic inches is used. The compression ratio is 16.4:1 and this engine uses rectangular rings. Procedure fuel Reference fuel with a sulfur specification of 0.38–0.42 mass % and an API gravity specification of 33–35°? is used for this procedure. Procedure parts evaluated Piston, rings and liner are evaluated. The piston is rated by the CRC (Coordinating Research Council) demerit procedure. Based on reference oil 809, the following acceptance limits apply: no piston, ring or liner distress, no stuck rings allowed. Based upon the time period that each procedure completed, the appropriate parameter adjustment factor is added to the procedure result. Caterpillar 1P Procedure, Procedure fixture The procedure fixture is a Caterpillar 1Y3700 single-cylinder direct-injection diesel procedure engine with a four-valve arrangement having a 5.4 in. Keystone top ring and second ring are used. The top ring is closer to the piston top than the 1K/1N. The engine features overhead cam and electronic injection control.
Tags : coordinating research council, diesel engine service, engine lubricant, piston ring, piston rings, api gravity, valve arrangement, electronic injection, parameter adjustment, injection diesel, duty diesel, demerit, overhead cam, cubic inches, crankcase
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