Vauxhall Workshop Service and Repair Manuals

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

Notice: 

Con-rod and crankshaft are removed.  

  Install, Connect   

The fastening bolts may be used once again to check the con-rod bearing play. Attach con-rod bearing cap with con-rod bearing shell to con-rod - tightening torque X 16 SZR: 25 Nm / 18 lbf. ft. + 30 ° , 16 LZ2 and 20 NEJ: 35 Nm / 26 lbf. ft. + 45 ° + 15 ° .     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   ÷ 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 journal diameter:   I + II     2     Example:   I   42.729 mm     II   + 42.725 mm       85.454 mm   ÷ 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.   Example:     Average con-rod bearing diameter   42.737 mm   Average con-rod bearing journal diameter   - 42.727 mm     0.010 mm     Permissible con-rod clearance: see Technical Data.