Engine Mount - Front

This procedure replaces the front engine mount on a 1992 Dodge Viper 8.0L V10, requiring engine support, removal of the through-bolt, and replacement of the mount assembly between the engine block and crossmember.

Warnings

Tools required

Parts

• Front engine mount assembly × 1 — Use OEM specification
• Engine mount hardware kit (if bolts are corroded) × 1 — Use OEM specification

Preparation

1. Park the vehicle on level ground and engage the parking brake.
2. Allow the engine to cool completely if recently operated.
3. Disconnect the negative battery cable to prevent accidental starter engagement.
4. Raise the front of the vehicle using a floor jack and support it securely on jack stands placed under the frame rails.
5. Remove the engine belly pan or undertray if equipped to access the engine mount area.

Procedure

1. 1

   Install engine support
   Position an engine support fixture across the engine bay, or carefully place a floor jack with a wood block under the oil pan to support the engine weight. Raise the jack or adjust the support fixture until it just begins to take the engine's weight, but do not lift the engine yet. The engine should remain in its normal position.
2. 2

   Locate the front engine mount
   From underneath the vehicle, locate the front engine mount. The Viper V10 uses side-mounted engine mounts attaching the engine block to the frame rails. Identify the front mount to be serviced, consisting of a rubber isolator assembly between the engine block bracket and the frame bracket, secured by a through-bolt and/or mounting bolts. Confirm exact mount configuration against the factory service manual before proceeding.
3. 3

   Remove the through-bolt
   Using the appropriate socket (verify size against factory service manual), remove the through-bolt nut from the engine mount. The through-bolt passes horizontally through the mount assembly. Remove the through-bolt by tapping it out with a drift punch if necessary. If the bolt is seized, apply penetrating oil and allow it to soak before attempting removal.
   Torque spec

   Through-Bolt102 Nm (75 lb-ft)
4. 4

   Support and raise the engine slightly
   Using the engine support fixture or floor jack, carefully raise the engine approximately 1/2 to 1 inch to relieve all load from the front mount. Monitor the engine position and ensure no hoses, wiring, or other components are being strained. The goal is to create clearance for mount removal, not to lift the engine excessively.
5. 5

   Remove engine mount-to-block fasteners
   Locate the fasteners securing the upper mount bracket to the engine block. Remove the mount-to-block bolts using the appropriate socket (verify count and size against factory service manual). Note their orientation as installed for correct reassembly. If corrosion is present, apply penetrating oil and use a wire brush to clean the bolt heads before removal.
   Torque spec

   Engine Mount-to-Block Bolts65 Nm (48 lb-ft)
6. 6

   Remove engine mount-to-frame fasteners
   Locate the fasteners securing the lower mount bracket to the crossmember or frame. Remove the mount-to-frame bolts using the appropriate socket (verify count and size against factory service manual). These bolts secure the mount bracket to the frame rail.
   Torque spec

   Engine Mount-to-Frame Bolts75 Nm (55 lb-ft)
7. 7

   Remove the old engine mount
   With all fasteners removed, carefully extract the front engine mount assembly from between the engine block and frame. You may need to use a pry bar to separate the mount from its mounting surfaces if it is stuck due to age or corrosion. Inspect the mounting surfaces on both the engine block and frame for damage, cracks, or excessive wear.
8. 8

   Prepare mounting surfaces
   Clean all mounting surfaces on the engine block and frame using a wire brush. Remove any rust, old gasket material, or debris. Inspect the threaded holes in the engine block for damage and chase the threads with a tap if necessary. Verify that the frame mounting holes are clean and free of obstruction.
9. 9

   Install the new engine mount
   Position the new front engine mount assembly between the engine block and frame. Align the mounting holes with the corresponding holes in the engine block and frame. The mount should fit snugly without forcing. Ensure the through-bolt hole in the mount is properly aligned horizontally.
10. 10

    Install engine mount-to-block bolts
    Install the 2 upper mount-to-block bolts hand-tight using an 18mm socket. Do not fully torque at this stage. Ensure the mount bracket is flush against the engine block mounting surface.
    Torque spec

    Engine Mount-to-Block Bolts65 Nm (48 lb-ft)
11. 11

    Install engine mount-to-frame bolts
    Install the 2 lower mount-to-frame bolts hand-tight using a 15mm socket. Do not fully torque at this stage. Verify that the mount is centered and properly seated on both the engine and frame mounting surfaces.
    Torque spec

    Engine Mount-to-Frame Bolts75 Nm (55 lb-ft)
12. 12

    Lower engine onto mount
    Carefully lower the engine using the support fixture or floor jack until the engine weight is resting naturally on the new mount. Verify that the mount is properly compressed and that the through-bolt hole alignment is maintained. Remove the engine support or jack once the engine is fully seated. Note: depress the clutch (this vehicle is equipped with a 6-speed manual transmission)
13. 13

    Install and torque the through-bolt
    Insert the through-bolt through the mount assembly and install the nut hand-tight. Using a torque wrench and the appropriate socket, torque the through-bolt nut to the factory-specified value (verify against Viper service manual). This bolt is critical for mount retention and must be torqued to specification.
    Torque spec

    Through-Bolt102 Nm (75 lb-ft)
14. 14

    Torque mount-to-block bolts
    Using a torque wrench and the appropriate socket, torque the engine mount-to-block bolts to the factory-specified value (verify against Viper service manual). Torque the bolts in a cross pattern if applicable to ensure even loading.
    Torque spec

    Engine Mount-to-Block Bolts65 Nm (48 lb-ft)
15. 15

    Torque mount-to-frame bolts
    Using a torque wrench and the appropriate socket, torque the engine mount-to-frame bolts to the factory-specified value (verify against Viper service manual). Verify that all fasteners are secure and that the mount is properly seated.
    Torque spec

    Engine Mount-to-Frame Bolts75 Nm (55 lb-ft)

Reassembly

1. Reinstall the engine belly pan or undertray if it was removed.
2. Reconnect the negative battery cable.
3. Lower the vehicle from jack stands and remove all supports.

Verification

• Start the engine and verify that there is no excessive engine movement or vibration.
• With the engine running, shift through all gears (if automatic) or depress the clutch (if manual) to verify the mount is properly supporting the engine under load.
• Perform a visual inspection from underneath to confirm all mount fasteners are tight and the mount is not deformed or improperly seated.
• Test drive the vehicle and listen for any unusual noises or vibrations that could indicate improper mount installation.

Related trouble codes on this vehicle

Codes that commonly send this job to the bay — tap one for symptoms, causes, and diagnostic steps.

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