Checking the axial play of the crankshaft with a dial indicator
1. Wipe the locations of the bearing shells on the crankshaft and install the upper main bearing shells.
2. Clean the main bearing shell locations and install the shells into the caps. If old shells are installed, make sure they are installed in their original locations.
3. To retain the thrust washers, apply a small amount of grease to both sides of main bearing #3.
4. Place the upper halves of the thrust rings in the grooves on the sides of main bearing No.3 with the grooves facing outward, and the tongue should be located in the groove.
5. Lubricate the crankshaft main bearing journals and main bearing shells with engine oil.
6. Install the rear main bearing seal ring onto the crankshaft.
7. Carefully lower the crankshaft into the crankcase.
8. Apply a thin layer of sealant to the mating surfaces of the crankcase and rear main bearing cap.
9. Lubricate both sides of the main bearing cap #3 to hold the thrust washers in place. Install the thrust washers with the grooves facing outward, the tongue should be positioned in the groove.
10. Install the main bearing caps, arrows on the caps should point towards the front of the engine.
11. Gradually tighten the main bearing cap mounting bolts to the specified torque, except for the No.3 bearing bolts, which should be tightened by hand only. Press the crankshaft to push it back to the stop, then slowly push it forward to the stop, hold it in this position, and tighten the No.3 main bearing cap mounting bolts to the specified torque, so that the thrust rings are installed in place.
12. Press the rear crankshaft seal ring onto the main bearing. When it is finally installed, protect the edges of the seal ring with adhesive tape.
13. Using a set of feeler gauges, measure the axial clearance of the crankshaft; the feeler gauge is installed between the crankshaft journal and the thrust washers. The clearance should be within the values specified in subsection 3.3.1. To adjust the gap, you can install thrust washers of different thicknesses.
14. Turn the crankshaft to check if it is sticking. If the shaft is very difficult to turn or is sticking, it is necessary to disassemble and thoroughly check it.
15. Lubricate the sealing areas of the rear main bearing cap (black) with sealant and install in place.
16. To install the seals, use a flat-blade screwdriver or similar tool. The seals are installed with the rounded surface facing the bearing cap.
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