Vauxhall Workshop Service and Repair Manuals

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

Con-rod and crankshaft are removed.

Torque/angle method

Install con-rod bearing caps at con-rod – tightening torque 20 Nm / 15 lbf. ft. + 70° – observe installation position.

  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 + 42.741 mm       128.211 mm divided by 3 = 42.737 mm The average con-rod bearing diameter is 42.737 mm.

  Measure

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 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.

  Measure

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

Permitted con-rod bearing play: 0.020 to 0.055 mm. For con-rod bearing shell selection – see "Technical Data".