Examination
1. Check for damaged or worn ring gear teeth.
2. Check for cracks, burrs or tarnish on the flywheel contact surface.
3. Measure the flywheel's axial runout over two full revolutions using a dial indicator. Press the flywheel while turning it to prevent axial movement of the crankshaft.
Note: Runout must be measured with the engine installed.
Standard (new): 0.05 mm max.
Operating limit: 0.15 mm.
If the runout is greater than the operating limit, replace the flywheel and check the runout.
4. Check the smooth rotation of the gearbox input shaft bearing by turning it with your finger. The bearing should rotate freely without jamming. Check the tightness of the bearing in the flywheel bore. If the bearing does not turn by hand or is loose, replace it.
Replacement
1. Install the special tool as shown.
2. Unscrew the flywheel mounting bolts crosswise in several steps and remove the flywheel.
3. Press the bearing out of the flywheel.
4. Press the new bearing into the flywheel using a tool as shown.
5. Align the hole in the flywheel with the crankshaft pin and install the flywheel. Tighten the flywheel mounting bolts by hand.
6. Install the flywheel lock, then tighten the mounting bolts in several steps in the order shown in the illustration.