This Can KILL Your BMW E46 E39 Engine !!! Leaking Coolant Hard Pipes Intake Manifold Removal

Introduction

In this tutorial, we will guide you through the process of replacing the leaking coolant hard pipes and removing the intake manifold on a BMW E46 or E39. This repair is crucial as failing to fix coolant leaks can lead to significant engine damage. By following these steps, you can ensure your BMW runs smoothly and efficiently.

Step 1: Gather Necessary Tools and Materials

Before you begin, make sure you have the following tools and materials ready:

• Ratchet and socket set (10mm, 11mm, and T30 sockets)
• Torque sockets
• Long screwdriver
• Pry bar
• Magnet (for retrieving dropped bolts)
• Gloves (preferably disposable)
• New coolant hard pipes
• Water-based grease for O-rings

Step 2: Remove the Throttle Body

1. Use a long screwdriver to loosen the hose clamps on the throttle body boot.
2. Remove the throttle body by:
   • Unplugging the cold start valve.
   • Unscrewing the throttle body bolts (10mm).
   • Carefully lifting the throttle body out while unplugging the electrical connector at the bottom.
3. Set the throttle body aside in a safe location.

Step 3: Disconnect Fuel Injectors

1. Locate the fuel injector rail and the bolts securing it (10mm).
2. Remove the bolts and gently pry the injectors out of the rail using a pry bar.
3. Ensure you do not disturb any fuel hoses to avoid spills.

Step 4: Remove the Intake Manifold

1. Unscrew the bolts holding the intake manifold (11mm).
2. Carefully lift the manifold while ensuring all attached sensors and hoses are disconnected.
3. Take note of any vacuum lines or electrical connectors and label them if necessary for easier reassembly.

Step 5: Replace the Coolant Hard Pipes

1. With the intake manifold removed, locate the coolant hard pipes.
2. Remove any connected hoses and bolts (typically 10mm or 13mm).
3. Carefully extract the old pipes and replace them with the new OEM pipes.
4. Apply a small amount of water-based grease to the O-rings of the new pipes to facilitate installation.

Step 6: Reassemble the Intake Manifold

1. Position the intake manifold back onto the engine.
2. Reconnect all sensors, vacuum lines, and injectors, ensuring everything is secured.
3. Tighten the intake manifold bolts to the manufacturer's specifications.

Step 7: Reattach the Throttle Body

1. Reconnect the throttle body, ensuring the electrical connector is plugged in.
2. Secure the throttle body with the bolts and hose clamps.

Conclusion

Congratulations! You have successfully replaced the coolant hard pipes and reassembled the intake manifold on your BMW E46 or E39. Ensure to check for any leaks after completing the job and top off the coolant as necessary. Regular maintenance will help keep your engine running smoothly, so consider scheduling further inspections and repairs as needed. If you're interested in learning more about automotive repair, consider subscribing for future tutorials.