The Mitsubishi Evo X exhaust manifold requires precise torque specifications for proper installation and optimal performance. Here's a comprehensive guide on the torque specs for the Evo X exhaust manifold:

Exhaust Manifold to Cylinder Head

The exhaust manifold-to-cylinder head bolts should be torqued to:

  • 37 ft-lbs (50 Nm) ± 3 ft-lbs

It's crucial to follow a specific tightening sequence when torquing these bolts. Start from the center and work your way outwards in a cross-pattern to ensure even pressure distribution.

Turbo to Exhaust Manifold

For the turbo-to-exhaust manifold bolts, the torque specification is:

  • 22 ft-lbs (30 Nm) ± 1 ft-lb

Ensure all mating surfaces are clean and free of debris before installation. Use new gaskets and hardware for the best seal.

Additional Torque Specifications

Here are some related torque specs for the Evo X exhaust system:

  • Exhaust manifold upper cover bolt: 8.0 ± 2.0 Nm
  • Exhaust manifold lower cover bolt: 8.0 ± 2.0 Nm
  • Exhaust manifold bracket bolt: 41 ± 10 Nm

Heat Shield Installation

When reinstalling the heat shield that covers the exhaust manifold and downpipe:

  • Torque the bolts to 6-8 ft-lbs (8-12 Nm)

Important Considerations

Always use high-quality hardware and follow the manufacturer's recommendations for thread lubricants or anti-seize compounds. Retorque the bolts after the initial heat cycle to ensure they maintain proper tension.

For aftermarket exhaust manifolds, consult the specific manufacturer's instructions, as torque specs may vary slightly from OEM specifications.

FAQs About Evo X Exhaust Manifold Torque Specs

    • Should I use new bolts when reinstalling the exhaust manifold?
      Yes, it's recommended to use new bolts to ensure proper clamping force and prevent exhaust leaks.
    • How often should I check the exhaust manifold bolts?
      Check and retorque the bolts after the first heat cycle and then periodically during routine maintenance, especially if you notice any exhaust leaks.
    • Can I use a torque wrench with a crow's foot for hard-to-reach bolts?
      Yes, but remember to account for the additional leverage when using a crow's foot attachment and adjust your torque wrench accordingly.

By following these torque specifications and installation guidelines, you'll ensure your Evo X's exhaust manifold is properly secured, minimizing the risk of leaks and maximizing performance.