Replace the front exhaust gasket (connection between exhaust manifold and front pipe) on a 2016-2024 Hyundai Tucson with 2.5L I4 AWD engine.

Warnings

Tools required

Parts

• Front exhaust gasket (manifold to front pipe) × 1 — Use OEM specification
• Exhaust flange bolts × 3 — Use OEM specification (if corroded)

Preparation

1. Ensure engine and exhaust system are completely cold
2. Raise vehicle and support securely on jack stands
3. Spray penetrating oil on all exhaust flange bolts and allow 15-30 minutes to penetrate
4. Inspect area and identify if heat shield removal is required for access
5. Gather all tools and parts before starting

Procedure

1. 1

   Remove heat shield if present
   If equipped, remove the exhaust heat shield covering the front exhaust connection using a 10mm socket. Some models have a shield that must be removed for access to the flange bolts. Set aside the shield and hardware.
   Torque spec

   Heat Shield Bolts10 Nm (7 lb-ft)
2. 2

   Disconnect oxygen sensor connector (if needed)
   Locate the upstream oxygen sensor near the exhaust manifold. If the sensor wire prevents access to the flange bolts, disconnect the electrical connector. Press the release tab and pull the connector apart. Do not remove the sensor unless absolutely necessary.
   ⚠Handle oxygen sensor wiring carefully as the connector is brittle and easily damaged.
3. 3

   Remove exhaust hanger support
   Locate the rubber exhaust hanger supporting the front pipe near the flange connection. Using a 12mm socket, remove the hanger bracket bolt to allow the exhaust system to drop slightly for easier flange separation. Support the exhaust pipe with your hand to prevent excessive stress.
   Torque spec

   Hanger Bolts20 Nm (15 lb-ft)
4. 4

   Remove exhaust flange bolts
   Using a 14mm socket with extension, remove the three bolts connecting the exhaust manifold to the front pipe/catalytic converter. Work in a cross pattern to evenly release tension. If bolts are seized, apply additional penetrating oil and use a breaker bar with steady pressure. Do not use impact tools as this may crack the manifold.
   ⚠If bolts break or strip, the manifold may need to be removed for extraction. Work carefully and deliberately.
5. 5

   Separate exhaust connection
   With all bolts removed, carefully pull the front pipe downward and away from the exhaust manifold. The old gasket may stick to either surface. Use a gentle rocking motion if needed. Support the front pipe to prevent it from hanging on the downstream hangers.
   ℹ️The exhaust system is heavy. Use proper lifting technique or have an assistant support the pipe.
6. 6

   Remove old gasket and clean surfaces
   Remove the old exhaust gasket from both the manifold flange and the front pipe flange. Use a wire brush to thoroughly clean both mating surfaces, removing all carbon deposits, rust, and old gasket material. The surfaces must be flat and clean for proper sealing. Inspect both flanges for cracks or warping.
   ⚠Do not use aggressive grinding tools on the manifold flange as this may damage the sealing surface.
7. 7

   Install new gasket
   Position the new exhaust gasket onto the exhaust manifold flange. The gasket should fit snugly over the manifold studs or bolt holes. Ensure the gasket is oriented correctly with any directional markings facing the proper direction. Some gaskets have a metal ring that should face the manifold side.
   ℹ️Do not apply sealant to the gasket. Modern exhaust gaskets are designed to seal without additional compounds.
8. 8

   Reconnect front pipe to manifold
   Lift the front pipe into position and align it with the exhaust manifold flange, ensuring the gasket remains properly seated. Insert all three flange bolts by hand. Apply anti-seize compound to the bolt threads before installation. Thread all bolts several turns by hand to ensure proper thread engagement before using tools.
   ⚠Cross-threading these bolts can damage the manifold. Ensure smooth thread engagement before tightening.
9. 9

   Torque flange bolts to specification
   Using a torque wrench, tighten the three exhaust flange bolts in a cross pattern to the specified torque of 45 Nm (33 lb-ft). Start by snugging all bolts evenly, then perform a final torque pass in sequence. Do not overtighten as this can crack the manifold or warp the flange.
   Torque spec

   Exhaust Flange Bolts45 Nm (33 lb-ft)
10. 10

    Reinstall exhaust hanger
    Reposition the rubber exhaust hanger and reinstall the hanger bracket bolt. Torque to 20 Nm (15 lb-ft) using a 12mm socket. Ensure the exhaust system hangs properly without strain on the flange connection.
    Torque spec

    Hanger Bolts20 Nm (15 lb-ft)
11. 11

    Reconnect oxygen sensor and reinstall heat shield
    If disconnected, reconnect the oxygen sensor electrical connector ensuring it clicks securely. If the heat shield was removed, reinstall it and torque the bolts to 10 Nm (7 lb-ft) using a 10mm socket.
    Torque spec

    Heat Shield Bolts10 Nm (7 lb-ft)

Reassembly

1. Verify all bolts are properly torqued and no tools or parts are left in the engine bay
2. Ensure all electrical connectors are fully seated and secured
3. Check that the exhaust system hangs properly without contacting the chassis or drivetrain components

Verification

• Lower vehicle from jack stands
• Start engine and allow to idle while listening for exhaust leaks at the front flange connection
• Check for any hissing or ticking sounds that indicate a leak
• Visually inspect the connection area for signs of exhaust gas escaping
• Test drive vehicle and verify no exhaust odors enter cabin and no abnormal sounds occur under acceleration
• After test drive, recheck flange bolts for proper torque while engine is warm (do not touch hot components)

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