How to Replace the Exhaust Manifold in a Mazda6

The Mazda 6 has carved out its own niche in the highly competitive midsize car segment. In 2003, the Mazda 6 has consistently received rave review for its stylish design, handsome interior and pleasing performance. Owners hang on to their Mazda 6s, so a good used model is a great find. Here are the steps to install the exhaust manifold on the 3.0L engine.

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Instructions

Remove the Exhaust Manifold
- 1
  
  Take the negative battery cable from the terminal. Remove the main silencer and pre-silencer, then remove the three-way converter from the side on which the manifold is being replaced.
- 2
  
  Remove the stud bolt and the front pipe. Unplug the two heated oxygen sensor connectors, then take out the exhaust gas recirculation (EGR) pipe.
- 3
  
  Loosen and remove the exhaust manifold fasteners. Lift the exhaust manifold from the engine and discard the gasket.
- 4
  
  Scrape the mating surfaces to remove any gasket material, dirt and carbon deposits. Wipe the surfaces with solvent. Check for damage.
Install the Exhaust Manifold
- 5
  
  Install the new gasket to the cylinder head. Position the V over the gasket.
- 6
  
  Tighten the exhaust manifold fasteners in sequence, workout out from the center. Torque the bolts to 14 to 19 foot pounds.
- 7
  
  Reconnect the EGR tube and the two heated oxygen sensor connectors. Connect the front pipe with a new gasket.
- 8
  
  Replace the three-way converter and then reconnect the pre-silencer and the main silencer. Attach the negative battery cable to the terminal and secure it.
- 9
  
  Start the engine and allow it to run for several minutes. Check for exhaust leaks and proper engine operation.

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How to Replace the Exhaust Manifold in a Mazda6

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