Repairing the gearbox output flange on a Mercedes-Benz SL73 AMG R129 involves a detailed process that requires both mechanical skills and an understanding of the vehicle’s drivetrain components. click here for more details on the download manual…..

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Below is a comprehensive guide to help you with the repair. Please note that this task can be complex and may require specialized tools and equipment.

### Tools and Equipment Needed

1. **Basic Hand Tools**:
– socket set (metric)
– Wrenches (metric)
– Screwdrivers (flathead and Phillips)
– Pliers
– Torque wrench

2. **Specialized Tools**:
– Gear puller (if the flange is stuck)
– Torque angle gauge
– Transmission jack or floor jack (with appropriate support)

3. **Safety Equipment**:
– Safety glasses
– Gloves
– Mechanic’s creeper

4. **Replacement Parts**:
– OEM gearbox output flange (if damaged)
– Seals and gaskets (if applicable)
– New bolts (if necessary)
– Transmission fluid (for refilling)

5. **Cleaning Supplies**:
– Brake cleaner
– Clean rags
– Scraper (for cleaning surfaces)

### Step-by-Step Repair Process

#### 1. Preparation

– **Safety First**: Ensure the vehicle is parked on a flat surface. Use wheel chocks and engage the parking brake. Disconnect the battery to prevent any electrical issues.

– **Lift the Vehicle**: Use a hydraulic jack to raise the vehicle and secure it with jack stands. Ensure it is stable before crawling underneath.

#### 2. Remove the Driveshaft

– **Access the Driveshaft**: Depending on the specific configuration, you may need to remove various components or covers to access the driveshaft.

– **Disconnect the Driveshaft**:
– Identify the bolts securing the driveshaft to the output flange.
– Using the appropriate socket, remove the bolts (keep them for reuse if Not damaged).
– If the driveshaft is stuck, carefully use a pry bar to separate it from the flange.

#### 3. Remove the Gearbox Output Flange

– **Inspect the Flange**: Before removal, inspect the output flange for any obvious signs of damage or wear.

– **Remove the Flange**:
– If the flange is bolted, remove the bolts securing it to the gearbox.
– Use a gear puller if the flange is stuck. Place the puller’s arms around the flange and tighten the central bolt until the flange separates from the gearbox.

– **Inspect the Seal**: Check the output seal. If it’s damaged, it will need to be replaced, as it can cause fluid leaks.

#### 4. Install New Flange (if necessary)

– **Prepare the New Flange**: If you are replacing the flange, ensure it’s clean and free from debris.

– **Install New Seal**: If the seal was removed, install the new seal into the gearbox output housing. Use a seal installation tool or a suitable object to ensure it is seated evenly.

– **Position the New Flange**: Align the new or repaired flange with the gearbox output shaft.

– **Secure the Flange**:
– If it’s a bolted flange, torque the bolts to the manufacturer’s specifications. Consult a repair manual for the correct torque specifications.
– If using a new flange, ensure that it is correctly seated and fits snugly against the gearbox.

#### 5. Reattach the Driveshaft

– **Align the Driveshaft**: Position the driveshaft back onto the output flange.

– **Secure the Driveshaft**: Reinstall the bolts and tighten them to the manufacturer’s specifications.

#### 6. Refill Transmission Fluid

– **Check Fluid Level**: If any transmission fluid was lost during the repair, make sure to refill it to the appropriate level.

– **Use the Proper Fluid**: Refer to the owner’s manual for the correct type of fluid.

#### 7. Final Checks

– **Inspect for Leaks**: Before lowering the vehicle, check for any signs of leaks around the output flange and seal.

– **Reconnect the Battery**: Once everything is reassembled and checked, reconnect the battery.

#### 8. Testing

– **Lower the Vehicle**: Safely lower the vehicle back to the ground.

– **Test Drive**: Take the vehicle for a test drive to ensure everything is functioning correctly. Listen for any unusual noises and check for leaks again after the drive.

### Conclusion

Repairing the gearbox output flange on a Mercedes-Benz SL73 AMG R129 is a detailed process that requires careful attention to detail and the right tools. By following these steps, you should be able to complete the repair successfully. However, if you are unsure at any stage, it is always best to consult a professional mechanic or a Mercedes specialist to avoid any potential issues.
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