These collar replace the narrow oil pump drive originally machined on earlier Nissan R32 RB26DETT all RB20DET, RB25DET, RB30E and RB30ET crankshafts.
These can also be used to replace a worn oil pump drive on R32, R33 and R34 RB26DETT crankshafts.
These collars fix one of the most common mechanical failures in RB engines "the smashing of the oil pump driven gear" These collars replace the factory drive and give full engagement on the inner oil pump.
Each collar is supplied with instructions and grub screws for extra securement.
These collars do require machining to the crank to fit and can not be fitted in place.