How to Change a Honda Exhaust Manifold

Written by justin moore
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How to Change a Honda Exhaust Manifold
Replace your exhaust manifold. (engine image by Albert Lozano from

The exhaust manifold on a Honda is responsible for clearing the exhaust gasses from the combustion chamber. Dampness and the heating and cooling of the exhaust manifold can make the metal rust, fatigue and crack. A crack in the exhaust manifold so close to the engine will result in an extremely loud exhaust leak. Not only is this a nuisance to the driver, in most cases it is also illegal.

Skill level:

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Things you need

  • Penetrating oil
  • 7/8-inch wrench
  • Ratchet
  • Extension
  • Sockets
  • Putty knife
  • Replacement exhaust manifold
  • Replacement exhaust manifold gaskets

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  1. 1

    Apply a generous coat of penetrating oil to the nuts and bolts on the exhaust manifold and the downpipe. Let it soak in for about an hour before starting the repair.

  2. 2

    Disconnect the electrical connector for the oxygen sensor. Remove the oxygen sensor using a 7/8-inch wrench. Remove the exhaust manifold heat shield.

  3. 3

    Remove the nuts that secure the manifold to the exhaust pipe. Remove the nuts that secure the exhaust manifold to the head using a crisscross pattern, starting in the centre.

  4. 4

    Scrape any gasket material that may be left behind off the head with a putty knife.

  1. 1

    Install the new gasket onto the head. Slide the replacement exhaust manifold onto the bolts. Install the nuts snug onto the studs.

  2. 2

    Tighten the nuts on the studs starting in the centre and use a crisscross pattern while working your way to the outside nuts. Install a new gasket onto the bottom of the exhaust manifold. Install the downpipe onto the exhaust manifold and tighten the nuts.

  3. 3

    Install the heat shield. Insert the oxygen sensor into the hole and tighten it. Reconnect the electrical connector.

Tips and warnings

  • Exhaust nuts can be rusted solid to the studs. Allow the penetrating oil enough time to soak in.
  • Always use new gaskets to prevent exhaust leaks.
  • Allow the exhaust to cool completely before working on it. Exhaust parts will become extremely hot, even if the engine runs for only a short time.

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