Exhaust Gasket - Front

Replacement of the front exhaust gaskets (exhaust manifold to head pipe connection) on the 1992 Dodge Viper 8.0L V10, requiring access from below and partial exhaust system disassembly.

Warnings

Tools required

Parts

• Front exhaust gaskets (manifold to head pipe) × 2 — Use OEM specification - qty varies by bank
• Exhaust flange bolts/nuts × 1 — Replace if corroded or damaged
• Exhaust manifold studs × 1 — Inspect and replace if damaged

Preparation

1. Park vehicle on level ground and apply parking brake firmly
2. Place wheel chocks behind rear wheels
3. Allow exhaust system to cool completely (minimum 1 hour after engine operation)
4. Raise front of vehicle with floor jack and support securely on jack stands at manufacturer-specified lift points
5. Remove front wheels if additional access is needed for your work position

Procedure

1. 1

   Access and inspect exhaust connections
   Position yourself under the vehicle with adequate lighting. Locate the front exhaust gasket connections where the exhaust manifolds connect to the head pipes on both banks of the V10. Inspect the flange bolts/nuts for corrosion. Apply penetrating oil to all fasteners at the manifold-to-head pipe flanges and allow to soak for 10-15 minutes.
2. 2

   Disconnect oxygen sensors
   If the vehicle is equipped with oxygen sensor(s) near the front gasket area, disconnect the electrical connector(s) by releasing the locking tabs. If a sensor will interfere with gasket access, remove it using an oxygen sensor socket or appropriate wrench, turning counterclockwise (standard right-hand thread). Note the position of each sensor for reinstallation. Verify actual sensor presence and location against factory documentation for this specific vehicle before proceeding.
   ⚠O2 sensor threads are fragile. Use steady, even pressure and avoid cross-threading during removal or installation.
   Torque spec

   O2 Sensor45 Nm (33 lb-ft)
3. 3

   Support exhaust system
   Identify the exhaust hangers downstream of the front gasket connection. The exhaust system will drop slightly when the flange bolts are removed. Ensure hangers are intact and will support the weight, or use a jack stand with a block of wood to support the downstream exhaust pipes during gasket replacement.
4. 4

   Remove right bank front flange fasteners
   Starting with the right (passenger side) bank, remove the flange bolts or nuts connecting the exhaust manifold to the head pipe. Work the fasteners evenly in a cross pattern. Count and inspect each fastener for damage or excessive corrosion requiring replacement.
   ⚠If fasteners are severely corroded and break, the manifold studs may require extraction. Do not force seized fasteners - apply additional penetrating oil and retry.
5. 5

   Separate right bank flange and remove gasket
   With all fasteners removed, carefully separate the head pipe flange from the exhaust manifold flange. The old gasket may be stuck to one or both surfaces. Remove the old gasket completely. Inspect the manifold flange face and head pipe flange face for warping, cracks, or damage that would prevent proper sealing.
6. 6

   Remove left bank front flange fasteners
   Move to the left (driver side) bank and remove the flange bolts or nuts connecting the exhaust manifold to the head pipe, following the same procedure as the right bank. Work fasteners evenly in a cross pattern.
   ⚠If fasteners are severely corroded and break, the manifold studs may require extraction. Do not force seized fasteners - apply additional penetrating oil and retry.
7. 7

   Separate left bank flange and remove gasket
   Carefully separate the left bank head pipe flange from the exhaust manifold flange. Remove the old gasket completely and inspect both flange surfaces for damage.
8. 8

   Clean flange mating surfaces
   Using a wire brush and gasket scraper, thoroughly clean both the manifold flange faces and head pipe flange faces on both banks. Remove all old gasket material, carbon deposits, and corrosion. The surfaces must be flat and clean for proper gasket sealing. Inspect manifold studs for damage and verify threads are clean.
9. 9

   Install new gaskets and align flanges
   Position the new front exhaust gasket on the right bank manifold flange, aligning all bolt holes. Carefully bring the head pipe flange up to mate with the manifold flange, ensuring the gasket remains properly positioned. Verify gasket alignment before inserting fasteners. Repeat for the left bank.
10. 10

    Install and torque flange fasteners
    Apply a thin coat of anti-seize compound to the threads of the flange bolts (or bolt threads if using nuts on studs). Install all fasteners for both banks finger-tight first. Once all fasteners are started, torque the flange bolts/nuts in a cross pattern to the factory-specified value (verify exact spec in the 1992 Viper service manual; typical exhaust flange fasteners in this size range are approximately 15-25 ft-lbs, but confirm before final torque). Work in multiple passes (50%, then 100%) to ensure even clamping force and proper gasket compression.
    ℹ️Apply anti-seize to fastener threads only - keep compound off gasket surfaces and flange faces.
    Torque spec

    Exhaust Flange Bolt28 Nm (21 lb-ft)
11. 11

    Reinstall oxygen sensors
    If oxygen sensors were removed, apply a thin coat of anti-seize compound to the sensor threads (avoid getting compound on the sensor tip). Install each sensor by hand first, ensuring threads engage properly, then tighten to specification. Reconnect all oxygen sensor electrical connectors, ensuring locking tabs engage fully.
    Torque spec

    O2 Sensor45 Nm (33 lb-ft)
12. 12

    Remove supports and lower vehicle
    Remove any support placed under the exhaust system. Verify all exhaust hangers are properly engaged and supporting the system. Reinstall front wheels if removed and torque lug nuts to specification. Raise vehicle slightly, remove jack stands, and lower vehicle to ground.

Reassembly

1. Reinstall front wheels if removed and torque lug nuts to specification
2. All exhaust hangers must be properly engaged to prevent stress on the new gasket connections
3. Double-check that all oxygen sensor connectors are securely attached

Verification

• Start engine and allow to idle. Listen for exhaust leaks at the front gasket connections - there should be no hissing or ticking sounds from the flange areas
• With engine at idle, carefully feel around the flange connections (maintaining safe distance from hot components) for escaping exhaust gases
• Visually inspect both front gasket connections for any signs of exhaust gas leakage (soot staining)
• Test drive vehicle and verify no exhaust smell enters cabin and no unusual exhaust noise is present
• After test drive and cool-down, re-inspect flange bolt torque and verify fasteners have not loosened

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