Early Nissan RB-series engines are known for a critical weak point at the oil pump drive. On the original crankshaft design used in RB26DETT, RB25DET, and RB20DET engines, the engagement area between the crankshaft snout and the oil pump gear is relatively small. Under high RPM, elevated oil pressure, or sustained performance use, this limited contact surface can wear, round off, or fail, potentially leading to loss of oil pressure and severe engine damage.
The Tomei Oil Pump Drive Crankshaft Collar (part number TA205A-NS05A) directly addresses this issue by significantly increasing the drive surface area. The precision-machined collar is pressed onto the crankshaft and secured with the included M5 stopper screws, creating a much larger and more durable engagement interface with the oil pump gear. This simple yet highly effective upgrade greatly improves long-term reliability and is widely regarded as essential insurance on early RB engines.
At Terra Firma Automotive, we supply this genuine Tomei Oil Pump Drive Crankshaft Collar as a key reliability component for Skyline GT-R, GTS-T, and other RB-powered builds. Whether you are rebuilding an early R32 or R33 engine, refreshing a high-mileage RB25, or preparing a performance RB20, this collar provides a permanent solution to a well-documented failure point. Installation requires crankshaft modification, so it is best performed during a bottom-end rebuild or oil pump service. Protect your investment with this proven Tomei upgrade available from Terra Firma Automotive.
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