Vauxhall Workshop Service and Repair Manuals

Crankshaft, Check (Bearing Play - with External and Internal Micrometer)  

  Install, Connect   

Install crankshaft bearing cap (1) with bearing shell (2) on cylinder block and tighten - 50 Nm / 37 lbf. ft. + 45 ° + 15 ° . For checking the crankshaft bearing play, the old bolts may be reused.     Measure    The average crankshaft bearing bore diameter is measured at points I, II and III (see illus. II) using an internal micrometer and then calculated.   Formula for calculation of average bearing bore diameter:   I   +   II   +   III   3     Example for calculation:   I   54.972 mm     + II   54.981 mm     + III   54.984 mm       164.937 mm   : 3 = 54.979 mm     The average bearing bore diameter is 54.979 mm.

 

Measure    The crankshaft bearing journal diameter is measured at points I and II using an external micrometer.   Formula for calculation of average bearing journal diameter:   I   +   II   2     Example for calculation:   I   54.960 mm     + II   54.962 mm       109.922 mm   : 2 = 54.961 mm (average bearing journal diameter)     The average bearing journal diameter is 54.961 mm.   The crankshaft bearing play is calculated from the average bearing bore diameter and average bearing journal diameter.     average crankshaft bearing bore diameter   54.979 mm   -   average crankshaft bearing journal diameter   54.961 mm     Bearing play   0.018 mm     In this example, the calculated crankshaft bearing play is 0.18 mm.   Permissible crankshaft bearing clearance: 0.015 mm to 0.041 mm