Nissan 12310-4BB0A Flywheel Assembly

Regarding the modification process, one has first to cancel the flywheel by first unbolting the transmission and then the clutch. To stop the flywheel from spinning you should either wedged the ring gear teeth with a bar, or else put a strap from the flywheel to the cylinder block. Then unscrew and take out the retaining bolts and finally, the flywheel is slid off the crankshaft with careful not to drop it since they are very heavy. For inspection, if clutch mating surface of the flywheel is deeply scored, Cracked or damaged, then it has to be replaced, it is recommended to consult a nissan dealer or any reputable engine reconditioning service. However, if the ring gear becomes worn or acquired without some teeth, it also needs to be replaced, and it is suggested to consult with Nissan dealer or specialist whether it is possible to restore. Cleansing of the mating surfaces of the flywheel as well as the crankshaft is done before positioning of the flywheel and new retaining bolts necessary for refitting done. Lock the ring gear similar to the previous step and torque the retaining bolts up to the required measure in two steps using an angle tightening gauge. Last but not the least, a clutch should be re-fixed while the lock tool should be removed from the transmission before fixing it.

If the flywheel is damaged, it must be renewed, and advice from a Nissan dealer or engine reconditioning specialist should be sought.

Check if the ring gear is worn or has missing teeth.