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, highlighting the importance of using the correct OEM component. This dowel is commonly inspected or replaced during transmission swaps, engine rebuilds, or performance upgrades to ensure consistent reliability.
It is important to note that this part is specific to the CA18DET engine; SR20DET engines utilize a different dowel configuration, with a solid pin typically in the upper position on the rear face. By using genuine Nissan parts from Terra Firma Automotive, S13 owners maintain precise alignment, protect drivetrain components, and preserve the performance and longevity of their CA18DET engine.
- 2 required
- 20mm Long
- 10mm Wide
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