To delete the transmission, skills of checking components including oil seals, and replacement where necessary. If applicable, the clutch should be removed and the check made on the components or the renewal done. Score alignment marks on the flywheel/driveplate and crankshaft so that proper alignment is easy while reinstalling. Do not permit the flywheel/driveplate to rotate by either locking the ring gear teeth or by placing a strap between the flywheel /driveplate and the cylinder block / crankcase, then turn the flywheel until tightened then turn off the ring gear bolts an equal amount. Loosen each bolt in turn and get new ones for refitting as these bolts are highly stressed and should be replaced every time they are upset. Slowly remove the flywheel/driveplate from the crankshaft as it is very massive and the edges of the starter ring gear may be harsh. Have the flywheel/drive plate cleaned of grease and oil and look for cracks, rivet groves, burned areas and score marks, score marks lighter can be rubbed off with emery cloth. Depend on the machine's type, look for cracked and broken ring gear teeth; lay the flywheel/driveplate on a flat surface to inspect for warpage. Check and clean both flywheel/driveplate surface and crankshaft surface before fitting it, if the crankshaft LH oil seal is leaking, replace before fitting. When the flywheel/driveplate is off, clean the inside face of the flywheel/driveplate as well as the threaded bolt holes in the crank journal where new sealer will be applied; it is critical to ensure good sealer contact as 'old' sealer takes up a lot of pressure and will retain very little torque. During installation ,fit the flywheel/driveplate to the crankshaft such a way that the holes are in- line position the new bolts and apply suitable sealer to the threads of the new bolts. To the tightening of the new bolt sequence, do it diagonally until it reaches the flywheel/driveplate then tighten the bolts to the torque described in the three different stages. The rest of reassembly is in the reverse of the removal process described above.