Vauxhall Workshop Service and Repair Manuals

Con-rod Bearing Clearance, Check (Determine Bearing Clearance with Micrometer and Inside Micrometer)

Note:   Con-rod and crankshaft are removed.

  Install

Attach con-rod bearing cap with con-rod bearing shell to con-rod – 35 Nm / 26 lbf. ft. + 45° + 15°. Bolts can be reused for checking con-rod bearing play.

Measure The average con-rod bearing diameter is measured at points I, II, and III using an internal micrometer and then calculated. Formula for calculating the average con-rod bearing diameter: I + II + III       3 Example:     I 42.738 mm     II 42.732 mm     III 42.761 mm       128.231 mm divided by 3 = 42.744 mm   The average con-rod bearing diameter is 42.744 mm.

The con-rod bearing journal diameter is measured with a micrometer at points I and II and then calculated. Formula for calculating the average con-rod bearing journal diameter I + II       2 Example:     I 42.729 mm     II 42.725 mm       85.454 mm divided by 2 = 42.727 mm   The average con-rod bearing journal diameter is 42.727 mm.

The con-rod bearing clearance is calculated from the difference in diameter between the con-rod bearing bore and the con-rod bearing journal.

Permissible con-rod bearing play: 0.010 to 0.061 mm.