Replacing the serpentine belt on a Mercedes-Benz B-Class B180 W245 involves several steps and requires specific tools. View and download the manual with one click here……
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Below is a detailed guide to help you through the process, including descriptions of every component involved.
### tools and Materials Required:
1. **Tools:**
– Socket set (including 10mm, 13mm, and 15mm sockets)
– Ratchet and extensions
– Torque wrench
– Screwdriver set (flathead and Phillips)
– Pliers (if needed)
– Belt tensioner tool (optional, but recommended)
– A flashlight or work light
– Gloves (to protect your hands)
2. **Materials:**
– New serpentine belt (ensure it’s the correct OEM part for B-Class B180 W245)
– Belt dressing (optional, for installation)
### Components Involved:
1. **Serpentine Belt:**
– A rubber belt that drives multiple peripheral devices in the engine, such as the alternator, power steering pump, water pump, and air conditioning compressor.
2. **Belt Tensioner:**
– A spring-loaded device that maintains tension on the serpentine belt to prevent it from slipping.
3. **Pulleys:**
– Various pulleys that guide the serpentine belt. These include the crankshaft pulley, alternator pulley, and idler pulley.
4. **Alternator:**
– Converts mechanical energy from the engine into electrical energy to charge the battery and power electrical systems.
5. **Power Steering Pump:**
– Provides hydraulic pressure to the steering system.
6. **Air conditioning Compressor:**
– Pressurizes the refrigerant and circulates it through the A/C system.
7. **Water Pump:**
– Circulates coolant throughout the engine and radiator.
### Step-by-Step Instructions:
#### Step 1: Preparation
1. **Safety First:**
– Park the vehicle on a flat surface, turn off the engine, and engage the parking brake.
– Disconnect the negative battery terminal to prevent any electrical issues.
2. **Gather tools and Materials:**
– Make sure you have all the necessary tools and the new serpentine belt ready.
#### Step 2: Access the Serpentine Belt
1. **Remove Engine Cover (if applicable):**
– Use a 10mm socket to remove bolts securing the engine cover (if your model has one).
– Lift the cover off and set it aside.
2. **Locate the Serpentine Belt:**
– Identify the routing of the serpentine belt. It typically runs around the crankshaft pulley, alternator, power steering pump, and A/C compressor. You can find a belt routing diagram on a sticker under the hood or in the owner’s manual.
#### Step 3: Release tension on the Belt
1. **Locate the Belt Tensioner:**
– The belt tensioner is usually mounted on the engine block and has a pulley attached.
2. **Using a Ratchet:**
– Attach a ratchet or a belt tensioner tool to the tensioner pulley.
– Rotate the tensioner counterclockwise to relieve tension on the belt.
3. **Remove the Belt:**
– While holding the tensioner, slide the serpentine belt off one of the pulleys (usually the alternator or idler pulley)
and then carefully release the tensioner.
#### Step 4: Install the New Serpentine Belt
1. **Route the New Belt:**
– Follow the belt routing diagram to install the new serpentine belt. Make sure it sits properly on all pulleys. Pay extra attention to the tensioner and idler pulleys.
2. **Reapply Tension:**
– Rotate the tensioner again and slip the belt over the last pulley while maintaining tension.
#### Step 5: Final Checks
1. **Inspect the Belt:**
– Ensure the belt is properly aligned on all pulleys without twists or misalignment.
2. **Reinstall Engine Cover (if applicable):**
– Secure the engine cover back in place with the bolts.
3. **Reconnect Battery:**
– Reconnect the negative battery terminal.
#### Step 6: Test the Installation
1. **Start the Engine:**
– Start the engine and observe the belt operation. Listen for any abnormal noises which could indicate a misalignment or issue.
2. **Check for Leaks:**
– Inspect around the pulleys and engine area for any signs of fluid leaks or abnormal behavior.
### Conclusion
Replacing the serpentine belt on a Mercedes-Benz B-Class B180 W245 can be done with the right tools and careful attention to detail. Following these steps should help you complete the replacement successfully. If in doubt, consult a professional mechanic or refer to the vehicle’s service manual for further guidance.
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