Replacing the synchro in a Mercedes-Benz SLK55 AMG R171 involves several intricate steps, as the process requires a good understanding of the vehicle’s transmission system. click here for more details on the download manual…..
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Below is a detailed guide on how to perform a synchro replacement, including the necessary components and tools.
### Components Needed
1. **New Synchros**: These are specific to the transmission model of the SLK55 AMG. Ensure you get OEM parts for compatibility.
2. **Transmission Fluid**: Consult the owner’s manual for the correct type and amount.
3. **Gaskets and Seals**: New gaskets and seals for reassembly to prevent leaks.
4. **Transmission oil Filter**: Recommended to replace while the transmission is out.
5. **Clutch Kit** (optional): If your clutch is worn, consider replacing it at the same time.
### Tools Required
– **Basic Hand Tools**: Wrenches, sockets, and screwdrivers.
– **Transmission Jack**: To safely support and lower the transmission.
– **Torque Wrench**: For proper reassembly torque settings.
– **Pliers**: For clips and small components.
– **Snap Ring Pliers**: For removing snap rings.
– **Seal Puller**: For removing old seals.
– **Magnetic Pick-Up Tool**: To retrieve dropped components.
– **Work Light**: To illuminate the work area.
### Step-by-Step Procedure
#### 1. **Preparation**
– **Safety First**: Ensure the car is parked on a flat surface. Disconnect the battery to prevent any electrical shorts.
– **Lift the Vehicle**: Use a hydraulic jack and jack stands to safely elevate the vehicle.
#### 2. **Remove the Transmission**
– **Disconnect Driveshaft**: Unbolt the driveshaft from the rear differential and slide it out.
– **Remove Exhaust Components**: Depending on the setup, you might need to remove the exhaust system to access the transmission.
– **Disconnect Electrical Connections**: Unplug any wiring harnesses connected to the transmission.
– **Unbolt the Transmission**: Remove the bolts securing the transmission to the engine. Ensure all bolts are accounted for.
– **Lower the Transmission**: Using a transmission jack, carefully lower the transmission from the vehicle.
#### 3. **Disassemble the Transmission**
– **Clean the Exterior**: Before opening the transmission, clean the exterior to prevent contamination.
– **Remove the Transmission Case Bolts**: Take off the bolts securing the transmission case. Keep track of different lengths and sizes.
– **Separate the Case Halves**: Gently pry the case apart, taking care not to damage any internal components.
#### 4. **Remove the Old Synchros**
– **Identify the Synchros**: Locate the synchros on the gearsets. They are typically found on the input and output shafts.
– **Remove Snap Rings**: Use snap ring pliers to remove any retaining rings holding the synchros in place.
– **Slide Off Old Synchros**: Carefully slide the old synchros off the shafts. Be cautious not to damage any surrounding components.
#### 5. **Install New Synchros**
– **Lubricate New Synchros**: Apply a light coat of transmission fluid to the new synchros for easier installation.
– **Position New Synchros**: Slide the new synchros onto the shafts, ensuring they fit snugly.
– **Reinstall Snap Rings**: Secure the new synchros with the snap rings, ensuring they are fully seated.
#### 6. **Reassemble the Transmission**
– **Clean and Inspect Components**: Check all gears, bearings,
and seals for wear or damage. Replace as necessary.
– **Reassemble the Transmission Case**: Align the case halves and bolt them back together using a torque wrench to the specified settings.
– **Install New Gaskets and Seals**: Ensure that all gaskets and seals are replaced to prevent leaks.
#### 7. **Reinstall the Transmission**
– **Lift the Transmission Back**: Using the transmission jack, raise the transmission back into position.
– **Reconnect Driveshaft**: Bolt the driveshaft back to the rear differential.
– **Reconnect Electrical Connections**: plug in any wiring harnesses that were disconnected.
– **Reinstall Exhaust Components**: If removed, reattach the exhaust system.
#### 8. **Refill Transmission Fluid**
– **Fill Transmission Fluid**: Use a funnel to add the correct type of transmission fluid through the fill plug. Check the owner’s manual for the recommended amount.
– **Check for Leaks**: After filling, check all connections for leaks.
#### 9. **Reassemble and Test Drive**
– **Reconnect Battery**: Reconnect the battery terminals.
– **Lower the Vehicle**: Carefully remove the jack stands and lower the vehicle.
– **Test Drive**: Start the vehicle and take it for a test drive to ensure everything is functioning correctly.
### Conclusion
Replacing the synchros in a Mercedes-Benz SLK55 AMG R171 is a complex task that requires mechanical skill and patience. It is crucial to follow each step carefully and use OEM parts for the best results. If you’re unsure about any step, it may be wise to consult a professional mechanic.
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