How To Rebuild A Car Engine (4B11T)

Introduction

This tutorial provides a comprehensive guide on how to rebuild a 4B11T car engine, specifically for the Mitsubishi Evo X. Whether you're a seasoned mechanic or a DIY enthusiast, this step-by-step approach will help you understand the intricacies of engine rebuilding, ensuring optimal performance and longevity for your vehicle.

Step 1: Gather Tools and Parts

Before starting the rebuild, ensure you have all necessary tools and parts. Here’s a list to get you started:

• Tools:

  • 1/2" Torque Wrench
  • 3/8" Torque Wrench
  • Ring Compressor
  • Sealant
  • Ring Filer
  • Assembly Lube
  • Bolt Lube
  • Plasti-gauge
  • Brake Cleaner
  • Shop Towels

• Parts:

  • Pistons
  • Rods
  • Main Bearings
  • Rod Bearings
  • Gasket Kit
  • Head Studs
  • Camshafts
  • Valve Springs

Consider purchasing from the provided links for specific parts and tools.

Step 2: Disassemble the Engine

Carefully disassemble the engine and remove all components. Follow these steps:

1. Remove the Engine from the Vehicle

   • Disconnect all electrical connections.
   • Drain fluids and remove the engine mounts.
   • Use an engine hoist to lift the engine out safely.

2. Take Apart the Engine Components

   • Start with the intake manifold, exhaust manifold, and turbocharger.
   • Mark and organize bolts and components to avoid confusion during reassembly.
   • Use a camera or notes to document the disassembly process.

Step 3: Inspect Components

Once disassembled, inspect all components for wear and damage:

• Check pistons for scoring or cracks.
• Inspect cylinder walls for scratches or wear.
• Measure bearing clearances using a Plasti-gauge to ensure they are within specifications.

Step 4: Clean All Parts

Thoroughly clean all parts to remove oil, dirt, and debris:

• Use brake cleaner and shop towels for best results.
• Ensure all oil passages are clear to prevent blockages during operation.

Step 5: Rebuild the Engine

Now, follow these steps to start the reassembly:

1. Install New Bearings

   • Apply assembly lube to the main and rod bearings.
   • Carefully position bearings in their respective housings.

2. Install Pistons

   • Use a ring compressor to install piston rings onto each piston.
   • Insert the piston into the cylinder, ensuring it aligns correctly.

3. Torque the Components

   • Use the torque wrenches to tighten main caps and rod bolts in the sequence specified in the service manual.
   • Apply bolt lube to ensure accurate torque readings.

4. Install Cylinder Head

   • Place a new gasket on the engine block.
   • Position the cylinder head and secure it using head studs.
   • Follow the recommended torque sequence for head studs.

Step 6: Final Assembly

Complete the rebuild by reinstalling remaining components:

• Attach the intake and exhaust manifolds.
• Reconnect the turbocharger and any other accessories.
• Ensure all electrical connections are secure and fluids are topped off.

Conclusion

Rebuilding a 4B11T engine can be a complex but rewarding project. By following these steps, you can ensure a successful rebuild that enhances your vehicle's performance. Remember to double-check all connections and clearances before starting the engine. For further enhancements, consider upgrading components like the turbo or fuel system. Happy rebuilding!