HARNESS AS 1991249 - Caterpillar

Illustration 1 g00915056
Table 1
Length Grades for Connecting Rods
Grade Letter Color Code Length (Y)
F Red 165.728 to 165.761 mm (6.5247 to 6.5260 inch)
G Orange 165.682 to 165.715 mm (6.5229 to 6.5242 inch)
H White 165.637 to 165.670 mm (6.5211 to 6.5224 inch)
J Green 165.591 to 165.624 mm (6.5193 to 6.5206 inch)
K Purple 165.545 to 165.578 mm (6.5175 to 6.5188 inch)
L Blue 165.499 to 165.532 mm (6.5157 to 6.4961 inch) Serrated Connecting Rods and Flat Connecting Rods
Illustration 2 g00884440 (1) Inside diameter of rod for bearing ... 38.89 to 38.92 mm (1.531 to 1.532 inch) (2) Inside diameter of bearing for piston pin after reaming ... 34.940 to 34.960 mm (1.3758 to 1.3765 inch)Outside diameter of bearing for piston pin ... 38.94 to 39.03 mm (1.535 to 1.536 inch)Clearance between small end bearing and piston pin ... 0.023 to 0.044 mm (0.0009 to 0.0017 inch) (3) Distance between center of piston pin and center of crankshaft bearing ... 219.05 to 219.10 mm (8.624 to 8.626 inch) (4) Bearings are available for remachined journals of the crankshaft which have the following undersize dimensions:
0.25 mm (0.010 inch)
0.51 mm (0.020 inch)
0.76 mm (0.030 inch)Bearing thickness for naturally aspirated engines ... 1.835 to 1.842 mm (0.0723 to 0.0726 inch)Bearing thickness for turbocharged engines ... 1.835 to 1.844 mm (0.0723 to 0.0726 inch)Width of connecting rod bearing for naturally aspirated engines ... 31.62 to 31.88 mm (1.245 to 1.255 inch)Width of connecting rod bearing for turbocharged engines ... 31.55 to 31.88 mm (1.2421 to 1.255 inch)Bearing clearance for naturally aspirated engines ... 0.035 to 0.081 mm (0.0014 to 0.0032 inch)Bearing clearance for turbocharged engines ... 0.030 to 0.081 mm (0.0012 to 0.0032 inch) (5) Inside diameter of rod for bearing ... 67.210 to 67.220 mm (2.6460 to 2.6465 inch) (6) Nut Some engines may be equipped with bolts that fasten the connecting rod caps to the connecting rods.Tighten the nuts for the connecting rod to the following torque. ... 125 N m (92 lb ft)Tighten the bolts (if equipped) that fasten the connecting rod caps to the following torque. ... 155 N m (114 lb ft)Hydraulically Fractured Connecting Rods
Illustration 3 g01064497Note: The caps and rods must stay together as a pair.Note: When the connecting rods are replaced, do not reuse the connecting rod bolts. New connecting rod bolts must be used.The mating surfaces of the connecting rod are produced by hydraulically fracturing the forged connecting rod. (7) Tighten the connecting rod bolts to the following torque. ... 18 N m (13 lb ft)Tighten the connecting rod bolts again to the following torque. ... 70 N m (52 lb ft)Tighten the connecting rod bolt for an additional 120 degrees. (8) Connecting rod bearing
Illustration 4 g01064498 (9) Diameter of the bore for the piston pin ... 43.01 to 43.04 mm (1.693 to 1.694 inch) (10) Distance between bearing centers ... 219.05 to 219.10 mm (8.624 to 8.626 inch) (11) Diameter for the bore for the connecting rod bearing ... 67.21 to 67.22 mm (2.6460 to 2.6465 inch)