Genuine Volvo V40 Crankshaft

Volvo V40 Crankshaft Parts and Q&A

• Crankshaft
  9125715
  Q: What steps should be taken if no work is to be done on the pistons and connecting rods during the removal of the cylinder head and crankshaft on Volvo V40?

  A:

  If no work is to be done on the Pistons and connecting rods, the removal of the cylinder head and the pistons is not necessary, but, on the contrary, the pistons should be pushed up the bores so as to clear the crank pins. Remove the oil pump, sump, intermediate section, clutch components and flywheel or driveplate and then the pistons and connecting rods. Before removing the crankshaft, check the endfloat by refitting the intermediate section or main bearing ladder temporarily or mounting a dial gauge aligned with the crankshaft nose and measuring the distance the crankshaft moves when pushed towards the dial gauge. If Endfloat is greater than it should be, check the thrust surfaces on the crankshaft for wear; if this is not evident, you could try new thrustwashers. For non GDI engines the thrustwashers are integral with the main bearing shells, for GDI engines separate washers are fitted beside the No 3 bearing. After removing the intermediate section or main bearing ladder, lift out the crankshaft taking care to unbolt and remove the crankshaft oil seal carrier on GDI engines. Remove the upper half main bearing shells from the crankcase in order. Clean the crankshaft in paraffin or an appropriate solvent, making sure that the oil holes are not blocked. Inspecting wear, scoring, pitting and cracking in the main and big-end bearing journals; wear in big-end bearings can result in metallic knocking and loss of oil pressure, while main bearing wear can lead to severe vibration and rumbling. Check for roughness on the bearing journal surface as any roughness is an indicator of need for regrinding or renewal. Measure the diameter of the main and big-end journals using a micrometer, comparing results to specifications to check for out of roundness or taper. If journals are not within tolerance, a new crankshaft may be required, however, check with an engine overhaul specialist first about the possibility of regrinding and matching graded bearing shells. Finally, check for wear or damage of the oil seal contact surfaces at both ends of the crankshaft; deep grooves may need to be consulted by a specialist and if the problem is too deep to be repaired, a new crankshaft will be required.