Specifications Unit: mm (in.) To measure the inside diameter of the bearing, the bearing fitted to each connecting rod must be secured by tightening the cap bolts to 5.5 kg·m (39.8 lb·ft). Measure the diameter in two positions, 1 and 2, and in two directions D\ and D2, as shown below. Obtain the average by the follow· ing formula: 01 + 02 0---- 2 .... Positions for miking connecting rod bearing (c) Check the contact pattern of bearing on crankpin by fitting the big end in the normal manner to the crankpin, with the crankshaft laid out on the bench, and by using a paste of red lead or Prussian blue to visualize the con- tact.
Be sure to tighten the cap bolts to the specified torque, that is,5.5 kg·m (39.8 lb·ft). The contact should occur over at least 75% of the entire surface; if not, replace the bearing. [NOTE] The above job of checking the contact pattern may be eliminated where the crankpin is ground to the specified tolerance and the bearing has been replaced. This is because a replacement bearing is precision·finished to ensure the speci· fied extent of contact. Miking connecting rod bearing -27 - Item Standard Repair limit Crankpin diameter 58 -0.035 -0.055 (2283 -0.00138) . -0.00217 Radial clearance between bearing and crankpin 0.035 ...., 0.100 (0.00138"'" 0.00394) 0.20 (0.0079) r.1:": 2 1