A flywheel or a driveplate can be removed by first removing the engine/ transmission (and the clutch, where necessary). Align the flywheel or driveplate or hold it together by passing a tool with teeth through the starter ring gear to the cylinder block to lock. Unscrew the holding bolts one at a time and remove the flywheel or driveplate off the crankshaft, replacing the spacer discs where there is an automatic transmission. Check flywheel starter ring gear; either worn or missing teeth, in either case the entire drive plate will need renewal in automatic models; ring gear renewal in manual models is sometimes possible, but this task should be left to a specialist because of critical requirements regarding heating. When the flywheel first mating face under the clutch is damaged, the face must be replaced, but may be ground on the surface. Measuring of securing bolts to see whether they require renewal including length and diameter against specification limits. To refit, clean the mating surfaces of the crankshaft and flywheel or driveplate, position the flywheel on the crankshaft with dowel alignment and install the securing bolts. Install the flywheel in the same order as it was removed or tighten the bolts respectively in a diagonal manner as per recommended stages of required torque. Install the engine or transmission back in, then refit the clutch, which may or may not be applicable.