Exhaust Manifold Gasket

Replace the exhaust manifold gasket on a 2012-2017 Toyota Camry 2.5L I4 engine to fix exhaust leaks and restore proper sealing between the manifold and cylinder head.

Warnings

Tools required

Parts

• Exhaust manifold gasket × 1 — Use OEM Toyota gasket
• Exhaust manifold nuts (if damaged) × 8 — 90179-10162 or equivalent
• Heat shield bolts (if damaged) × 3 — Use OEM specification
• Exhaust pipe flange gasket × 1 — Use OEM specification
• Oxygen sensor (if damaged during removal) × 1 — Use OEM specification

Preparation

1. Ensure engine is completely cold (wait at least 3 hours after last operation)
2. Disconnect negative battery cable and secure away from terminal
3. Raise front of vehicle and support securely on jack stands
4. Remove engine splash shield/under cover using 10mm socket
5. Spray all exhaust manifold nuts, heat shield bolts, and oxygen sensor threads with penetrating oil
6. Allow penetrating oil to soak for at least 30 minutes (ideally overnight)

Procedure

1. 1

   Remove upper engine cover and air intake components
   Remove the plastic engine cover by pulling upward on the four corner grommets. Disconnect the air intake duct from the throttle body and remove the air filter housing assembly to gain access to the top of the engine. Label and disconnect any vacuum lines attached to the intake components.
2. 2

   Disconnect oxygen sensor electrical connector
   Locate the heated oxygen sensor (HO2S) on the exhaust manifold. Press the tab and disconnect the electrical connector. Trace the wiring harness and remove any clips securing it to nearby components. From underneath the vehicle, use the oxygen sensor socket to remove the sensor by turning counterclockwise. Set aside carefully to avoid damage.
   ⚠Do not allow the oxygen sensor to hang by its wiring. Support the sensor to prevent internal damage.
3. 3

   Remove heat shields
   Remove the upper and lower heat shields from the exhaust manifold. The upper shield is secured by three bolts accessible from above. The lower shield may have additional mounting points. Use a 10mm socket to remove all heat shield bolts. If bolts are seized, apply additional penetrating oil and allow to soak before attempting removal.
   Torque spec

   Heat Shield Bolts10 Nm (7 lb-ft)
4. 4

   Disconnect EGR tube if equipped
   If your vehicle is equipped with an EGR system, locate the EGR tube connecting to the exhaust manifold. Use a 14mm wrench to loosen and remove the EGR tube fitting at the manifold. Support the tube to prevent bending. Some models may not have this component.
5. 5

   Separate exhaust pipe from manifold
   From underneath the vehicle, locate the connection between the exhaust manifold and the front exhaust pipe (catalytic converter). Remove the two flange bolts using a 14mm socket. You may need to support the exhaust pipe with a jack or wire to prevent it from hanging on the rubber hangers. Separate the pipe from the manifold and inspect the flange gasket.
   ⚠The exhaust pipe is heavy. Support it properly to prevent damage to hangers or injury.
6. 6

   Remove manifold support bracket
   Locate the exhaust manifold support bracket that connects the manifold to the engine block or transmission. Remove the mounting bolts using a 14mm socket. This bracket provides structural support and must be removed before the manifold can be taken off. Access may be tight and require extensions and a universal joint.
7. 7

   Remove exhaust manifold nuts
   Working from the hottest part of the manifold (center cylinders) toward the coolest parts (outer cylinders), carefully remove all eight exhaust manifold nuts using a 12mm socket. Use penetrating oil liberally if nuts show resistance. If a stud begins to turn with the nut, stop immediately and apply more penetrating oil. Work the nut back and forth gently until it breaks free. Keep nuts organized for inspection.
   ⚠If a stud breaks, stop and assess whether stud extraction is needed before proceeding. Broken studs must be extracted and replaced.
   Torque spec

   Exhaust Manifold Nuts30 Nm (22 lb-ft)
8. 8

   Remove exhaust manifold
   With all nuts removed, carefully pull the exhaust manifold away from the cylinder head. It may require gentle rocking or prying to break the gasket seal. Once free, lift the manifold out of the engine bay. Inspect the manifold for cracks, warping, or damage. Measure flatness with a straightedge if warping is suspected.
9. 9

   Remove old gasket and clean mating surfaces
   Remove all remnants of the old exhaust manifold gasket from both the cylinder head and manifold surfaces. Use a plastic or brass gasket scraper to avoid damaging the aluminum surfaces. Follow with a wire brush and clean with brake cleaner. Inspect the cylinder head surface for damage or warping. Check all studs for damage and replace any that are bent, stripped, or damaged.
   ⚠Do not use steel scrapers or aggressive wire wheels on aluminum cylinder head surfaces as this can cause damage requiring machining.
   Torque spec

   Exhaust Manifold Studs15 Nm (11 lb-ft)
10. 10

    Install new gasket and position manifold
    Place the new exhaust manifold gasket onto the cylinder head studs, ensuring proper orientation with any embossed markings facing the manifold. Carefully position the exhaust manifold onto the studs and align it with the gasket. Ensure the manifold seats evenly against the gasket before installing any fasteners.
11. 11

    Install and torque manifold nuts
    Ensure manifold stud threads are clean. Only apply anti-seize if the published torque spec accounts for lubricated threads; otherwise install dry or reduce torque accordingly. Thread all eight nuts onto the studs by hand to ensure proper threading. Using a torque wrench, tighten the nuts in a spiral pattern starting from the center cylinders (hottest area) and working toward the outer cylinders. Torque to 30 Nm (22 lb-ft) in two stages: first to 15 Nm, then to final specification. This ensures even gasket compression.
    ℹ️Proper torque sequence from hot to cold prevents gasket distortion and ensures even sealing.
    Torque spec

    Exhaust Manifold Nuts30 Nm (22 lb-ft)
12. 12

    Reinstall manifold support bracket
    Position the exhaust manifold support bracket and install the mounting bolts. Apply anti-seize to bolt threads. Torque the mounting bolts to 47 Nm (35 lb-ft) using a torque wrench. Ensure the bracket is properly seated and provides rigid support to the manifold.
13. 13

    Reconnect exhaust pipe to manifold
    Install a new exhaust flange gasket between the manifold and front pipe. Align the exhaust pipe with the manifold flange and install the two flange bolts. Apply anti-seize to the bolt threads. Torque the flange bolts to 47 Nm (35 lb-ft) in a cross pattern. Remove any support used for the exhaust pipe.
14. 14

    Reinstall oxygen sensor
    Apply a thin coating of anti-seize compound to the oxygen sensor threads only, being extremely careful not to get any on the sensor element. Thread the sensor into the exhaust manifold by hand, then torque to 45 Nm (33 lb-ft) using the oxygen sensor socket. Reconnect the electrical connector and secure the wiring harness with clips.
    ⚠Never apply anti-seize to the oxygen sensor element. Contamination will cause sensor failure and incorrect readings.
15. 15

    Reinstall remaining components
    If equipped, reconnect the EGR tube to the exhaust manifold and torque the fitting to 35 Nm (26 lb-ft). Reinstall both heat shields and torque bolts to 10 Nm (7 lb-ft). Reinstall the air intake components, air filter housing, and engine cover. Torque cover bolts to 16 Nm (12 lb-ft) if applicable. Reinstall the engine splash shield from underneath.
    Torque spec

    Heat Shield Bolts10 Nm (7 lb-ft)

Reassembly

1. Double-check that all fasteners have been tightened to proper torque specifications
2. Verify all electrical connectors are properly seated and locked
3. Ensure no tools or parts have been left in the engine bay
4. Reconnect the negative battery cable

Verification

• Start the engine and listen carefully for any exhaust leaks at the manifold-to-head and manifold-to-pipe connections
• Allow engine to reach operating temperature and recheck for leaks while engine is hot
• Check for proper oxygen sensor operation by monitoring readings with a scan tool if available
• Verify no check engine lights or fault codes are present
• Inspect underneath vehicle for any exhaust leaks while engine is running
• Test drive vehicle and listen for any unusual exhaust sounds or ticking noises from the manifold area

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