Replacing the upper control arm on a Mercedes-Benz CLA250 C117 4MATIC requires a good understanding of the vehicle’s suspension components and a careful approach to ensure safety and proper functionality. click here for more details on the download manual…..
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Here’s a detailed step-by-step guide to help you through the process, including descriptions of every component involved.
### Tools and Materials Needed:
1. **Tools:**
– Socket set (including 10mm, 13mm, 15mm, 17mm, and larger sockets)
– Wrench set (ratcheting preferred)
– Torque wrench
– Ball joint separator tool or pickle fork
– Rubber mallet
– Jack stands
– Floor jack
– Screwdrivers (flathead and Phillips)
– Pry bar
– Pliers
– Safety goggles and gloves
2. **Materials:**
– New upper control arm (OEM recommended)
– New rubber bushings (if not included with the control arm)
– New cotter pins (if applicable)
– Grease (if required for bushings)
– Loctite (thread locking compound, optional)
### Steps for Upper Control Arm Replacement:
#### 1. **Preparation:**
– Park the vehicle on a flat surface, engage the parking brake, and wear safety goggles and gloves.
– Gather all tools and parts needed for the replacement.
#### 2. **Lifting the Vehicle:**
– Use a floor jack to lift the front of the vehicle.
– secure the vehicle with jack stands to ensure it is stable and safe to work under.
#### 3. **Remove the Wheel:**
– Using a lug wrench, loosen and remove the lug nuts on the front wheel where the control arm is being replaced.
– Remove the wheel and set it aside.
#### 4. **Accessing the Upper Control Arm:**
– Locate the upper control arm, which is mounted to the chassis and also connects to the steering knuckle.
– You will see the upper control arm has two mounting points: one at the chassis (typically a bolt) and another at the steering knuckle (a ball joint).
#### 5. **Removing the Upper Control Arm:**
– **Disconnect from Steering Knuckle:**
– Remove the cotter pin (if applicable) and the nut securing the ball joint to the steering knuckle using the appropriate socket.
– Use a ball joint separator tool or a pickle fork to separate the ball joint from the steering knuckle. Be cautious to avoid damaging the knuckle.
– **Remove Control Arm Bolts:**
– Locate and remove the bolts securing the upper control arm to the chassis. These may require a 10mm, 13mm, or larger socket.
– Support the control arm with one hand while removing the bolts to prevent it from falling.
#### 6. **Installing the New Upper Control Arm:**
– Position the new upper control arm in place, aligning it with the bolt holes on the chassis and the steering knuckle.
– Insert the bolts securing the upper control arm to the chassis and hand-tighten them initially.
– **Reconnect Ball Joint:**
– Align the ball joint with the steering knuckle and insert it.
– secure it with the nut and tighten it to the manufacturer’s specifications using a torque wrench. Insert a new cotter pin if applicable.
#### 7. **Finalizing Installation:**
– Once all bolts are tightened, check that everything is secure.
– If the control arm has bushings, ensure they are properly seated and lubricated as necessary.
#### 8. **Reinstalling the Wheel:**
– Place the wheel back onto the hub
and hand-tighten the lug nuts.
– Lower the vehicle from the jack stands and onto the ground.
#### 9. **Torque Wheel Lug Nuts:**
– Use a torque wrench to tighten the lug nuts to the manufacturer’s specified torque settings, ensuring they are properly secured.
#### 10. **Check Alignment:**
– After replacing suspension components like the upper control arm, it’s important to have the vehicle’s wheel alignment checked and adjusted if necessary. This ensures proper handling and tire wear.
### final Notes:
– Always refer to the specific service manual for your Mercedes-Benz CLA250 C117 4MATIC for exact torque specifications and any unique procedures that may be required.
– If you are unsure or uncomfortable with any step in this process, it may be best to consult a professional mechanic.
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