Serpentine Belt

Remove and replace the serpentine belt on a 2005 Dodge Viper 8.3L V10, including inspection of tensioner and idler pulleys.

Warnings

Tools required

Parts

• Serpentine belt × 1 — Use OEM specification for 8.3L V10
• Belt tensioner assembly × 1 — Replace if worn or noisy
• Idler pulley × 1 — Replace if worn or noisy

Preparation

1. Park vehicle on level surface and engage parking brake
2. Allow engine to cool completely if recently operated
3. Photograph or sketch the serpentine belt routing for reference during installation
4. Verify belt routing diagram is present on radiator shroud or fan shroud; photograph if present

Procedure

1. 1

   Locate and access the belt tensioner
   Open the hood and secure it. Locate the automatic belt tensioner on the front of the engine. The tensioner is mounted near the front of the engine with a spring-loaded arm that maintains belt tension. Identify the fitting on the tensioner (hex or square drive) used to rotate the tensioner and relieve belt tension; confirm the correct size against the service manual before applying force.
2. 2

   Inspect belt routing and condition
   Before removal, verify the belt routing matches your photo or diagram. Inspect the existing belt for cracks, glazing, fraying, or uneven wear patterns. Note the belt path around all pulleys including alternator, power steering pump, water pump, A/C compressor, crankshaft, tensioner, and idler pulley.
3. 3

   Release belt tension and remove belt
   Insert the correct-size socket or wrench onto the tensioner, or insert a 3/8" breaker bar into the square hole in the tensioner arm if equipped. Rotate the tensioner in the direction that unloads the spring arm (verify direction against the service manual) to relieve tension on the belt. While holding tension released, slip the belt off the nearest pulley (typically the alternator or idler pulley). Slowly release the tensioner back to its rest position. Remove the belt from all remaining pulleys and extract it from the engine bay.
4. 4

   Inspect tensioner and idler pulley condition
   With the belt removed, spin the tensioner pulley and idler pulley by hand. Both should rotate smoothly without grinding, roughness, or lateral play. Check for oil leakage from the pulley bearing seals. Grasp the tensioner arm and move it through its full range of motion; it should move smoothly with consistent spring resistance and return to the rest position without binding. Replace any components showing wear, noise, or resistance.
5. 5

   Replace tensioner if necessary (optional)
   If the tensioner requires replacement, remove the mounting bolt(s) securing the tensioner to the engine (verify bolt size and count against the service manual). Remove the tensioner assembly. Install the new tensioner and secure with the mounting bolt(s). Torque to the manufacturer's specification.
   Torque spec

   Belt Tensioner Bolt55 Nm (41 lb-ft)
6. 6

   Replace idler pulley if necessary (optional)
   If the idler pulley requires replacement, remove the mounting bolt(s) securing the idler pulley to the engine (verify bolt size and count against the service manual). Remove the idler pulley assembly. Install the new idler pulley and secure with the mounting bolt(s). Torque to the manufacturer's specification.
   Torque spec

   Idler Pulley Bolt45 Nm (33 lb-ft)
7. 7

   Route the new belt
   Beginning at the crankshaft pulley, route the new serpentine belt around all pulleys following your routing diagram or photo, leaving the tensioner pulley for last. Ensure the belt is seated in the proper grooves on each pulley with ribs aligned. The ribbed side of the belt contacts the grooved accessory pulleys; verify against the routing diagram which pulleys (such as the idler or tensioner) ride on the smooth back side of the belt before final installation.
8. 8

   Install belt onto tensioner pulley
   Using the correct-size socket or breaker bar, rotate the tensioner in the direction that unloads the spring arm (as verified against the service manual) to create slack in the belt path. Slip the belt onto the tensioner pulley, ensuring it is fully seated in the pulley grooves. Slowly release the tensioner, allowing it to apply proper tension to the belt. Verify the belt is correctly seated on all pulleys.
9. 9

   Verify belt alignment and tension
   Visually inspect all pulleys to confirm the belt is centered in each groove with no misalignment. The belt should not contact any pulley flanges. Check that the tensioner arm is within its normal operating range (not at full extension or compression). Manually rotate the crankshaft pulley one full revolution clockwise using a socket on the crankshaft bolt to ensure the belt tracks properly and does not slip off any pulley.

Reassembly

1. No disassembly was required beyond belt removal; all components remain in place

Verification

• Start the engine and observe belt operation for 30 seconds, listening for any squealing, chirping, or slapping noises that indicate improper tension or alignment
• Shut off the engine and re-inspect belt alignment on all pulleys to confirm no movement occurred during initial operation
• Test all belt-driven accessories: verify alternator charging, power steering assist, and air conditioning operation
• After 100-200 miles of driving, re-inspect belt condition and seating to ensure proper break-in

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