Nissan 180SX S13 Engine Block to Transmission Dowel (Lower) CA18

The Nissan 180SX S13 Engine Block to Transmission Lower Dowel for the CA18DET is a precision-engineered hollow steel pin designed to ensure perfect alignment between the engine block and the transmission bell housing. Positioned on the rear face of the CA18DET cylinder block in the lower machined hole, this tubular dowel measures approximately 20mm long with a 10mm outer diameter and a hollow center, protruding slightly to provide precise alignment during engine-to-transmission installation. As the primary lower dowel, it plays a critical role in maintaining vertical stability for proper input shaft seating, clutch and flywheel alignment, and gasket sealing at the joint. The hollow design allows slight flexibility during installation while maintaining rigidity under torque, which is essential for drivetrain integrity in high-performance rear-wheel-drive applications such as the 180SX S13. Misalignment at this location can lead to clutch engagement issues, input shaft wear, or leaks, hi