Swapping engines can breathe new life into a vehicle, and for Nissan and Datsun enthusiasts, the KA24DE engine is a popular choice for its robust performance. A common question arises when considering this swap: will the KA24DE bolt up to my existing Z-series transmission, like those found behind the Z20 or even a Z24 engine? The answer is generally yes, but there are crucial details to understand to ensure a successful and smooth engine swap.
The good news is that the KA24E and KA24DE FS5W71C 5-speed transmissions share the same bolt pattern and orientation as the Z-series motors. This means that if you are upgrading from a Z-series engine, such as a Z20 or Z24, to a KA24DE while wanting to retain your current 5-speed transmission, the engines should physically bolt together. This compatibility simplifies the mechanical aspect of the swap, allowing the KA24DE to align correctly with your Z-series transmission.
However, while the engine and transmission housings may match, there’s a critical component that requires attention: the release bearing housing. The release bearing housing, which is clipped to the clutch arm, is designed to match the pressure plate of the original engine. The pressure plate on your original Z-series engine (like a Z20 or potentially a Z24 depending on your setup) might not be the same size or type as what is intended for the KA24DE. This mismatch can cause issues with clutch engagement and operation after the swap.
To address this potential problem, you have a couple of effective solutions:
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Utilize the KA Transmission Release Bearing Housing: If you have access to the transmission that originally came with the KA24DE engine, the simplest solution is to remove the release bearing housing from the KA transmission. This housing is designed to work perfectly with the KA pressure plate. You can then unclip the release bearing housing from your Z-series transmission’s clutch arm and replace it with the KA unit. This ensures that the release bearing housing and pressure plate are a matched set, maintaining proper clutch function.
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Retain Z-Series Clutch Components: Alternatively, you might be able to use the clutch, pressure plate, and flywheel from your original Z-series engine (like a Z20 or Z24) on the KA24DE motor. In this scenario, you can continue using the release bearing housing that was already paired with your Z-series transmission. If you choose this route, especially with the torquier KA24DE replacing a smaller Z-series engine, consider upgrading to a higher-performance pressure plate. For instance, if the Z20 flywheel fits the KA24DE, using a 200mm Roadster pressure plate is advisable to handle the increased torque output of the KA engine and ensure reliable clutch performance.
While engine mounts are likely to be in different locations and driveshaft lengths might need adjustment depending on your specific vehicle (like a Datsun 510 mentioned in the original discussion), the fundamental compatibility between the KA24DE and Z-series transmissions at the bellhousing is a significant advantage. Careful attention to details like the release bearing housing and clutch components will pave the way for a successful and enjoyable engine swap, enhancing your vehicle’s performance with the robust KA24DE engine.
