Nissan Laurel C33 Engine Block Rear Main Oil Seal Retainer Locating Dowel RB20

The Nissan Laurel C33 Engine Block Rear Main Oil Seal Retainer Locating Dowel for RB20 engines is a precision-engineered component that guarantees accurate alignment between the cylinder block and the rear main oil seal retainer housing. Installed in the machined port at the lower rear of the engine block near the oil pan joint, this small steel dowel, approximately 5mm in diameter and 12mm long, ensures the retainer is positioned correctly during assembly, preventing misalignment that could compromise sealing performance.

Proper alignment of the rear main seal retainer is critical for maintaining consistent crankshaft lubrication and preventing oil leaks under the high torque and pressure conditions common to RB-series engines. Without this dowel, the housing could become distorted, leading to premature seal wear, oil contamination, or damage to bearings. Its precise fit safeguards the engine’s bottom-end integrity, supporting reliable performance in both daily driving and high-performance applications.

This locating dowel is typically inspected or replaced during rear main seal servicing, clutch replacements, or complete engine rebuilds to ensure a leak-free and properly aligned assembly. Terra Firma Automotive provides genuine Nissan parts, delivering OEM-quality precision and durability. Installing the correct rear main oil seal retainer dowel helps maintain the longevity, reliability, and performance of your Nissan Laurel C33 RB20 engine, giving you confidence in every drive.

• 2 Required On RB20
  
• 12mm Long
• 5mm Wide