STOP 6P4971 - Caterpillar

Illustration 1 g01378044
Illustration 2 g01378397
Positioning the piston pin bearing (A) Bore for piston pin bearing Dimension ... 64.592 0.013 mm (2.5430 0.0005 inch) Tight fit between connecting rod eye and piston pin bearing ... 0.05 to 0.10 mm (0.002 to 0.004 inch)To install the piston pin bearing, the connecting rod must be heated. Do not use a torch to heat the connecting rod. Maximum temperature for heating of connecting rod ... 175 °C to 260 °C (347 °F to 500 °F) (X) The bearing junction and the locating hole are angled 180 degrees from each other. The bearing junction and the locating hole must be assembled within area (X) . (Y) Tolerance for installation of bearing junction and locating hole ... 5 degrees (B) Dimension Distance between center of bearings ... 270.76 mm (10.660 inch) (C) Bore Bore in the connecting rod without the bearing after torquing the connecting rod bolts ... 103.200 0.013 mm (4.0630 0.0005 inch) (D) Crankshaft bearing Bore in bearing for crankshaft ... 97.088 0.016 mm (3.8224 0.0006 inch) Clearance between new bearing and crankshaft ... 0.070 mm (0.0028 inch) to ... 0.178 mm (0.0070 inch)
Illustration 3 g01378027
(1) Piston pin Diameter of new piston pin ... 59.975 0.005 mm (2.3612 0.0002 inch) (E) Bore in new bearing for piston pin ... 60.035 0.008 mm (2.3636 0.0003 inch)
Illustration 4 g01378024
Use the following procedure to tighten the connecting rod bolts:
Put engine oil on the bolt threads and the contact surfaces before assembly.
Tighten the bolts in the following order.Tighten bolts (2) and (4) . ... 70 4 N m (50 3 lb ft)Tighten bolts (3) and (5) . ... 70 4 N m (50 3 lb ft)Additionally tighten each bolt (3) and (5) . ... 60 5 degreesAgain, tighten bolts (2) and (4) . ... 70 4 N m (50 3 lb ft)Additionally tighten each bolt (2) and (4) . ... 60 5 degrees (6) Bolt for piston cooling jet Tighten the bolt to following torque. ... 40 8 N m (30 6 lb ft)To prevent damage to the piston cooling jet during service, the piston cooling jets must be removed.Minimum permissible clearance between the piston, the piston cooling jet, and the crankshaft ... 0.63 mm (0.025 inch)