Place a new O-ring on the oil pick-up pipe and insert the pipe into its location, holding it with the bracket retaining bolt tight to the specific torque. Wipe off any smears of oil from the oil pan and intermediate section joint faces and find new O-rings in the recesses in the intermediate section. Using a short-haired application roller, apply an even coating of Volvo liquid gasket on the oil pan mating face, making sure that the entire surface is covered in a thin coating for a good seal. Position the oil pan and place four of the retaining bolts in and tighten them finger tight only. Use a straight-edge to make sure that the rear edges of the oil pan and cylinder block are flush and then tighten the four bolts to just hold the oil pan in place. Refit the remaining bolts and screw all, increasingly, to the progressing centre, to the specified torque. Where appropriate, install new O-rings to the oil cooler thermostat housing mating surface and re-fit the housing and tighten the retaining bolts firmly.