Tomei Oil Pump Drive Collar for OEM Crankshaft Compatible with RB26DETT / RB25DET / RB20DET Engine

For owners of early-generation RB26DETT / RB25DET / RB20DET engines using the original crankshaft — this TOMEI oil-pump drive crankshaft collar corrects a known issue with the narrow stock oil-pump drive snout. By providing a larger, robust contact surface for the oil-pump gear, it significantly reduces the risk of premature wear or oil-pump failure. Constructed for durability and reliability, this collar ensures stable oil-pump engagement — essential for high-RPM, high-boost, or performance builds. If you’re upgrading your oil pump or installing an aftermarket pump/gear, this collar is a highly recommended mod to keep your RB engine’s oil delivery consistent and dependable.

• Optimized for OEM RB Crankshafts: Specifically engineered for RB26DETT / RB25DET / RB20DET engines using stock crankshafts — ideal for “early-gen” engines with narrow oil-pump drives.
• Improved Contact Surface: Enlarges the contact area between the crankshaft and oil-pump gear — reducing wear and improving reliability compared to stock narrow-drive geometry.
• Prevents Oil-Pump Failure on Upgrades: Especially valuable if you’re installing a high-flow or aftermarket oil-pump setup — the correct collar ensures the pump drives reliably under higher load.
• Easy Install (with Crank Modification): Designed to fit RB OEM crankshaft — simply install on crank snout (modification of snout may be required) for improved oil-pump engagement.
• Enhanced Engine Longevity: By ensuring stable oil-pump drive and eliminating slop or premature wear, the collar contributes to consistent oil pressure — a critical factor for protecting bearings and internals in high-stress RB builds.