Replacing the input shaft bearing on a Porsche Boxster 986 is a complex procedure that requires mechanical skill and a proper understanding of the vehicle’s components. click here for more details on the download manual…..
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Below, I’ll provide a detailed guide for this replacement, including necessary components, tools, and steps.
### Components Needed
1. **Input Shaft Bearing** – The replacement bearing specific to the Boxster 986 model.
2. **Seals** – New seals for the input shaft to prevent leaks.
3. **Gear Oil** – To refill the transmission after the replacement.
4. **Loctite Threadlocker** – For securing bolts.
5. **New bolts/washers** – If any are damaged or corroded.
### Tools Required
1. **Socket Set** – Metric sizes, including deep sockets.
2. **Wrenches** – Open-end and box wrenches in metric sizes.
3. **Torque Wrench** – To ensure bolts are tightened to specifications.
4. **Pry Bar** – For removing parts if necessary.
5. **Bearing Puller** – To remove the old bearing.
6. **Hammer** – To help drive out or install components.
7. **Drift Punch** – For aligning and driving out pins.
8. **Oil Catch Pan** – To catch any leaking transmission fluid.
9. **Floor Jack and Jack Stands** – To lift and support the car safely.
10. **Transmission Jack** – Ideally, to support and lower the transmission.
11. **Shop Manual** – For specific torque specifications and procedures.
### Procedure
#### Step 1: Preparation
1. **Safety First**: Make sure you’re working in a well-ventilated area, and wear safety glasses and gloves.
2. **Disconnect Battery**: Disconnect the negative terminal to prevent any electrical issues.
3. **Lift the Vehicle**: Use a floor jack to lift the rear of the vehicle and secure it with jack stands.
#### Step 2: Remove the Transmission
1. **Drain Transmission Fluid**: Place an oil catch pan under the transmission and remove the drain plug. Allow fluid to drain completely.
2. **Remove Exhaust Components**: Depending on your setup, you may need to remove the exhaust system to gain access to the transmission.
3. **Disconnect Driveshaft**: Remove any bolts securing the driveshaft to the transmission.
4. **Detach Shift Linkage**: Unlink the shift lever and any cables connected to the transmission.
5. **Unbolt the Transmission**: Remove the bolts securing the transmission to the engine. Support the transmission with a transmission jack as you remove the final bolts.
6. **Lower the Transmission**: Carefully lower the transmission from the vehicle.
#### Step 3: Access the Input Shaft Bearing
1. **Remove Transmission Case Cover**: Depending on the model, you may need to remove additional covers or components to access the input shaft bearing.
2. **Inspect the Input Shaft**: Once you have access, inspect the input shaft for damage or wear.
#### Step 4: Replace Input Shaft Bearing
1. **Remove Old Bearing**: Use a bearing puller to carefully remove the old input shaft bearing. Ensure not to damage the input shaft during this process.
2. **Clean the Area**: Clean the area where the new bearing will sit to ensure a proper fit.
3. **Install New Bearing**: Use a press or a suitable tool to install the new bearing. Make sure it is seated properly
and flush with the housing.
4. **Replace Seals**: Install new seals around the input shaft to prevent oil leaks.
#### Step 5: Reassemble Transmission
1. **Reassemble Transmission Components**: Replace any covers or components you removed to access the bearing.
2. **Torque Specifications**: Use a torque wrench to ensure all bolts are tightened to the specifications provided in the shop manual.
#### Step 6: Reinstall Transmission
1. **Lift the Transmission**: Use the transmission jack to raise the transmission back into place.
2. **Reconnect Driveshaft**: Secure the driveshaft back to the transmission.
3. **Reconnect Shift Linkage**: Reattach the shift lever and any cables.
4. **Reattach Exhaust Components**: If you removed any exhaust parts, reinstall them now.
5. **Refill Transmission Fluid**: Replace the drain plug and refill the transmission with the appropriate gear oil.
#### Step 7: Final Steps
1. **Reconnect Battery**: Reconnect the negative terminal of the battery.
2. **Test Drive**: Start the vehicle and take it for a test drive to ensure everything is functioning correctly and listen for any unusual noises.
### Conclusion
The input shaft bearing replacement on a Porsche Boxster 986 is a labor-intensive process requiring precision and attention to detail. Always refer to the vehicle’s service manual for specific instructions and torque specifications to ensure a successful repair. If you are not comfortable performing this procedure, it may be advisable to seek assistance from a professional mechanic.
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