The Nissan Silvia, 180SX, and 200SX S13, S14, and S15 Engine Block Rear Main Oil Seal Retainer Locating Dowel for SR20 and CA18 engines is a high-precision OEM component designed to guarantee exact alignment between the engine block and the rear main oil seal retainer housing. Installed in the machined hole at the lower rear of the cylinder block near the oil pan joint, this small steel dowel, approximately 5mm in diameter and 12mm long, ensures the housing seats perfectly during assembly, preventing misalignment that could compromise sealing integrity.
Accurate placement of the rear main seal retainer is critical for maintaining proper crankshaft lubrication and oil pressure, especially under the high torque and stress conditions common to SR20 and CA18 engines. Even minor deviations can cause premature seal wear, oil leaks, or bearing damage, making this dowel essential for reliable engine performance and longevity.
This locating dowel is routinely replaced during rear main seal servicing, clutch replacement, or full engine rebuilds to ensure a leak-free and properly aligned assembly. Terra Firma Automotive provides genuine Nissan parts that uphold OEM standards, delivering the durability and precision necessary for high-performance SR and CA18 engines. Trust in Terra Firma Automotive to keep your Silvia, 180SX, or 200SX operating at peak performance with proper alignment and long-term reliability.
- 4 Required
- 12mm Long
- 5mm Wide
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