Crankshaft — inspection (Opel Astra F)

The crankshaft must be cleaned with kerosene or a suitable solvent and dried, preferably with compressed air.

Inspect the main and rod journals for wear, scratches, pitting and cracks.

Wear of the connecting rod journal is accompanied by a distinct metallic knock during engine operation (especially at low revs), as well as some loss of pressure in the lubrication system.

Wear of the main journals is accompanied by strong engine vibration and knocking, which increases with increasing engine speed, and also by loss of pressure in the lubrication system.

If the crankshaft has been ground, check the crankshaft oil holes for burrs. If so, remove them with a velvet file.

Measure the diameter of the main and connecting rod journals with a micrometer, compare the results with the required ones. If the crankshaft journals are damaged, have a taper, deviation from roundness or excessive wear, the crankshaft will have to be ground.

Check the seal surfaces on both sides of the crankshaft for wear and damage. If the seal has "rubbed" a groove on the crankshaft surface, you should contact a specialist.

If required, check the TDC sensor wheel teeth for damage. If the wheel clearly needs replacing, contact a Vauxhall/Opel workshop as the crankshaft may need to be balanced before being fitted to the engine.