Nissan Stagea C34 Engine Block Rear Main Oil Seal Retainer Locating Dowel RB26/25/20

The Nissan Stagea C34 Engine Block Rear Main Oil Seal Retainer Locating Dowel for RB26, RB25, and RB20 engines is an essential OEM component engineered to maintain precise alignment and sealing integrity between the engine block and the rear main oil seal retainer housing. Positioned in a machined hole at the lower rear section of the cylinder block near the oil pan joint, this small steel dowel, approximately 5mm in diameter and 12mm long, ensures that the retainer housing seats perfectly during assembly.

Its precision alignment prevents seal distortion or misplacement, which could otherwise cause oil leaks or compromise crankshaft sealing. In high-performance RB engines found in the Stagea C34 260RS and related models, this alignment is vital for maintaining crankshaft balance, oil pressure stability, and long-term engine reliability. Even minor misalignment under high torque or heat cycles can lead to seal failure or bearing damage, making this dowel a critical component for both factory and rebuilt engines.

This locating dowel is often replaced during rear main seal servicing, clutch jobs, or full engine rebuilds to ensure a leak-free, precision fit. Terra Firma Automotive provides genuine Nissan components that preserve the engineering standards and durability expected from your Stagea’s RB-series engine.

• 2 Required On RB26/25/20
  
• 12mm Long
• 5mm Wide