(4) To ~he.:k the rod with a piston, pla~e the rod on the surfa~e plate as shown below, insert a round bar of the ~rankpin diameter into and through its big end bore, and take measurement at "A" and "B." The differen.:e between the two measurements tel1s the straighteness of the rod. When one or more, or all connecting rods are to be repla~ed, sele~t new rods so that the variance in weight among the rods is within the value given in the spedfication. A B Specification Unit: gram (oz) Variance in weight among connecting rods // / Checking connecting rod on surface plate (5) Check the connecting rod end playas follows:
Check each connecting rod for end play in the manner illustrated, with the cap bolts tightened to 5.5 kg-m (39.8 lb-ft). Use a thickness gauge to measure the end play (which is the clearance between big end and crank arm). If the clearance measured exceeds the service limit, replace the connecting rod or bearing. Specifications Unit: mm (in.) Checking end play of connecting rod (6) Check the bearings as follows: (a) Inspect each bearing for evidence of wiping or fatigue failure, for scratches by dirt particles imbedded in and for improper seating on the bore. Determine whether the bearing should be re-used or replaced on the basis of fmdings.
(b) Check the radial clearance between crankpin and bearing; if the repair limit speCified below is exceeded by the checked clearance, replace the bearing. Where the crankpin is to be ground to the next undersize, use a replacement bear- ing of that undersize. The two bearing undersizes are 0.25 mm (0.00984 in.) and 0.50 mm (0.01969 in.). -26- Item Standard Service limit Connecting rod end play 0.15 -- 0.35 (0.0059"" 0.0138) 0.50 (0.0197)