Genuine Volvo S80 Crankshaft

Volvo S80 Crankshaft Parts and Q&A

• Crankshaft
  30757085
  Q: What is the process of crankshaft refitting in engine reassembly after an overhaul on Volvo S80?

  A:

  Crankshaft refitting is the first step of engine reassembling following engine overhaul provided that the cylinder block/crankcase and crankshaft have been cleaned, inspected and repaired as required and piston cooling jets and valve refitted. Place the cylinder block on a clean and level work surface with the crankcase facing up. Remove any old bearing shells from the block and intermediate section if they are still in position. Clean the main bearing shell seats in the crankcase and the backs of the new bearing shells, insert the upper shells in their proper place, and make sure the ones with thrustwashers are put on the No 5 bearing position, and the thicker shell on the intermediate section. Lubricate the bearing shells in the crankcase with clean engine oil, wipe clean the crankshaft journals and lower the crankshaft into position, making sure the shells are in position. Inject oil into the crankshaft oilways and wipe off any excess oil from the crankshaft and intermediate section mating faces. Apply an even coating of Volvo liquid gasket solution to the cylinder block mating face of intermediate section, as it should be full coverage and a thin layer for a good seal. Clean the main bearing shell seats at the intermediate section and the back of the bearing shells and insert the lower shells in their correct position and press them home. Lightly lubricate the bearing shells in the intermediate section, avoiding getting the liquid gasket solution on the shells. Lay the intermediate section on the crankshaft and cylinder block, insert the retaining bolts and tighten them in five sections to the required torque and torque angle from the outside to the inside. Turn the crankshaft, it will be a bit resistant as there are new parts, but make sure there are no tight spots or binding. It is advisable to check the crankshaft endfloat at this stage and if the thrust surfaces have been checked and new bearing shells fitted the endfloat should be within specification. Lubricate the location of the left hand oil seal, the crankshaft and a new oil seal, and fit the oil seal with the lips inwards, using a piece of tube or the old oil seal inverted to tap the new one in until flush.
• Crankshaft
  8250529
  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 S80?

  A:

  If no work is to be done on the Pistons and connecting rods, it is unnecessary to remove the cylinder head and pistons, the latter being pushed up the bores to clear the crankpins. The procedure is to take the oil pump, sump, intermediate section, clutch parts, flywheel/driveplate out of the engine, and then the pistons and connecting rods. Before you remove the crankshaft, check the endfloat by refitting the intermediate section of the crankshaft temporarily and fitting a dial gauge along with the crankshaft. Push the crankshaft away from the gage in order to zero the gage, then make it lever toward the gage to measure the endfloat. If the endfloat is found to be out of specifications, check the crankshaft thrust surfaces for wear; if no wear is detected, new thrust washers should clear the problem. After removing the intermediate section pull the crankshaft out carefully and remove the upper half main bearing shells, but in order. Clean the crankshaft with paraffin or a good solvent making sure the oil holes are clear. Inspect the main and big-end bearing journals for wear, scoring, pitting and cracking. Big-end bearing wear may cause metallic knocking and oil pressure loss, and main bearing wear may cause engine vibration and rumble, not only increasing with speed, but also causing oil pressure loss. Check for roughness on the bearing journal as any roughness means that it needs to be regrinded or needs to be renewed. Have the crankshaft measured and inspected by an engine reconditioning specialist for advice on undersize bearings and reconditioning.