COUPLING AS- 2542163 - Caterpillar

(1) Clearance between top ring and groove ... .0030 to .0055 in.(0.076 to 0.140 mm) Replacement needed at ... .011 in.(0.28 mm)Maximum permissible clearance ... .014 in.(0.36 mm)(2) Clearance between oil ring and groove ... .0015 to .0035 in.(0.038 to 0.089 mm) Replacement needed at ... .006 in(0.15 mm)Maximum permissible clearance ... .008 in.(0.20 mm)(3) Bore in piston for pin ... 1.5005 to 1.5009 in.(38.113 to 38.123 mm) Maximum permissible clearance between piston pin and bore in piston ... .003 in.(0.08 mm)(4) Top ring: Clearance between ends of piston ring ... .0225 .0075 in.(0.572 0.191 mm)Ring needs replacement when clearance is ... .045 in.(1.14 mm)Maximum permissible clearance (replacement of ring necessary) ... .055 in.(1.40 mm) Clearance is measured between ends of piston ring while piston ring is installed in the part of the cylinder bore that has no wear.(5) Oil ring: Clearance between ends of piston ring ... .020 .010 in.(0.51 0.25 mm)Ring needs replacement when clearance is ... .038 in.(0.97 mm)Maximum permissible clearance (replacement of ring necessary) ... .045 in.(1.14 mm)
TOP VIEW OF PISTON (DI ENGINE)
TOP VIEW OF PISTON (PC ENGINE)(6) Installation of piston to connecting rod: DI Engine: Bearing tab slots (6) of connecting rod must be on same side as piston crater (7).PC Engine: Bearing tab slots (6) of connecting rod must be on same side as piston valve pockets (8).(7) Installation of piston and connecting rod group in engine: DI Engine: Craters (7) of pistons must be installed toward camshaft side of engine.PC Engine: Valve pockets (8) of pistons must be installed toward camshaft side of engine.