This collar replaces the narrow oil pump drive originally machined on earlier Nissan R32 RB26DETT crankshafts, as well as all RB20DET, RB25DET, RB30E and RB30ET crankshafts.
It provides full engagement on the inner oil pump gear which greatly reduces the likelihood of oil pump gear breakage.
The crank collars are CNC machined from billet 4340 high tensile bar stock in Napier, New Zealand.
Each collar is supplied with detailed instructions and required fasteners. Machining is required to fit this collar and therefore it can not be fitted to a crankshaft while still fitted to an engine.