BLADE CYLINDER ASSEMBLY 4D8483 - Caterpillar

(1) Bore in connecting rod for piston pin bearing ... 55.436 0.013 mm (2.1825 .0005 in.) Tight fit between connecting rod eye and piston pin bearing ... 0.05 to 0.10 mm (.002 to .004 in.) Connecting rod must be heated for installation of piston pin bearing. Do not use a torch.Heat connecting rod to temperature of ... 177 to 260° C (350 to 500° F)
Positioning Pin Bearing Piston pin bearing junction must be assembled within either area "A" (90 10° from the centerline through the connecting rod bores) as shown.Make reference to Special Instruction Form No. SMHS7295 for use of pin bearing removal and installation tools and procedures.(2) Bore in connecting rod for bearing with nuts tight to specifications (6) ... 103.500 0.013 mm (4.0748 .0005 in.)(3) Distance between center of bearings ... 261.62 0.05 mm (10.300 .002 in.)(4) Bore in bearing for piston pin (new) ... 50.830 0.008 mm (2.0012 .0003 in.) Diameter of piston pin (new) ... 50.795 0.005 mm (1.9998 .0002 in.)Maximum permissible clearance between bearing and piston pin (worn) ... 0.08 mm (.003 in.)(5) Bore in bearing for crankshaft ... 97.119 to 97.175 mm (3.8236 to 3.8258 in.) Clearance between bearing and crankshaft (new) ... 0.071 to 0.168 mm (.0028 to .0066 in.)Maximum permissible clearance between bearing and crankshaft (worn) ... 0.25 mm (.010 in.) Bearings are available in 0.64 mm (.025 in.) and 1.27 mm (.050 in.) smaller than original size.
Marks For Tightening Connecting Rod Bolts(6) Tightening procedure for connecting rod bolts: a. Put 2P2506 Thread Lubricant on bolt threads and contact surfaces of nut and cap.b. Tighten both nuts to ... 80 8 N m (60 6 lb.ft.)c. Put a mark on each nut and end of bolt as shown.d. Tighten each nut from mark ... 120° 5° The connecting rod must be installed so the chamfer on the edge of bore (5) is near the corner on the crankshaft. The side opposite the chamfered edge must be against the other connecting rod on the same crankshaft pin.Side clearance between two connecting rods on same crankshaft pin (new) ... 0.28 to 0.84 mm (.011 to .033 in.) Make reference to Special Instruction Form Nos. GMG02394 and SMHS7366 for information to check and recondition connecting rods.