Timing Chain Guide

This procedure replaces the timing chain guide on a 2005 Dodge Viper 8.3L V10, requiring removal of the front timing cover, tensioner, and chain to access the worn guide assembly.

Warnings

Tools required

Parts

• Timing chain guide × 1 — Use OEM specification
• Timing cover gasket × 1 — Use OEM specification
• Valve cover gaskets (left and right) × 2 — Use OEM specification
• Crankshaft front seal × 1 — Use OEM specification
• RTV silicone gasket maker (Mopar specified) × 1 — Mopar part number or equivalent
• Engine coolant (Zerex G-05 HOAT 50/50) × 1 — Use specified coolant type
• Engine oil (0W-40 full synthetic) × 1 — Use specified oil grade
• Oil filter × 1 — Use OEM specification

Fluids

• Engine coolant (Zerex G-05 HOAT 50/50) — 19 qt
• Engine oil (0W-40 full synthetic) — 11 qt

Preparation

1. Park vehicle on level ground and engage parking brake
2. Disconnect negative battery cable and secure away from terminal
3. Allow engine to cool completely (minimum 2 hours after operation)
4. Remove engine cover and any decorative panels
5. Place drain pan under radiator and drain coolant completely from radiator petcock and engine block drain plugs
6. Drain engine oil and remove oil filter
7. Remove air intake system and throttle body for access
8. Remove serpentine belt by releasing tensioner
9. Support engine from above using engine hoist with load leveler attached to lifting eyes

Procedure

1. 1

   Remove accessory drive components
   Remove the power steering pump (leave hoses connected and secure aside), alternator, A/C compressor (leave hoses connected and secure aside), and idler pulleys. Label all electrical connectors and mounting hardware for reassembly. The alternator and A/C compressor can remain attached to their hoses if supported properly.
2. 2

   Remove valve covers
   Remove ignition coil packs from both cylinder banks and secure wiring harnesses out of the way. Remove the valve cover bolts from both left and right valve covers. Carefully remove valve covers and gaskets. Inspect valve train for any abnormal wear while exposed.
3. 3

   Remove water pump and thermostat housing
   Remove the water pump bolts and separate water pump from timing cover. Remove thermostat housing from the front of the engine. These components obstruct timing cover removal and must be removed first. Keep track of bolt lengths as they vary by location.
4. 4

   Remove crankshaft pulley
   Install crankshaft holding tool or lock flywheel to prevent rotation. Using a breaker bar, loosen the crankshaft pulley bolt (counterclockwise rotation viewed from front, standard right-hand thread). Remove bolt completely. Install harmonic balancer puller and remove crankshaft pulley from crankshaft snout. Inspect keyway for damage.
   Torque spec

   Crankshaft Pulley Bolt176 Nm (130 lb-ft)
5. 5

   Support engine and remove front mount
   Ensure engine hoist is properly supporting engine weight. Remove the front engine mount bolts connecting mount to engine block and to crossmember. Remove front engine mount assembly. This provides necessary clearance for timing cover removal on this platform.
6. 6

   Remove timing cover
   Remove all timing cover bolts, noting that there are two different bolt sizes (standard and 8mm). The 8mm bolts are typically located at specific positions and are longer. Carefully pry timing cover away from engine block using plastic pry tools at designated pry points. Do not damage sealing surfaces. Remove timing cover and old gasket material.
7. 7

   Verify TDC position and mark timing alignment
   Rotate engine by hand to Top Dead Center on cylinder #1 compression stroke. Both intake and exhaust valves for cylinder #1 should be closed (rockers loose). Verify timing marks on the crankshaft sprocket and the single camshaft sprocket align with their respective timing marks at the front of the block. Mark these positions with paint pen for reassembly reference.
8. 8

   Release timing chain tensioner
   Locate the timing chain tensioner on the passenger side of the engine. Remove the tensioner bolt and carefully extract the tensioner assembly. The tensioner is spring-loaded; control it during removal. Inspect tensioner for wear, scoring, or damage. This releases tension on the timing chain.
   Torque spec

   Tensioner Bolt20 Nm (15 lb-ft)
9. 9

   Remove camshaft sprocket bolts
   Using camshaft holding tools or carefully wedging the camshafts to prevent rotation, remove the camshaft sprocket bolt from the single block-mounted camshaft (this is an OHV pushrod V10 with one camshaft sprocket and one crankshaft sprocket). Keep bolts organized by cylinder bank and intake/exhaust position.
   Torque spec

   Camshaft Sprocket Bolt75 Nm (55 lb-ft)
10. 10

    Remove timing chain and sprockets
    Carefully remove the timing chain from all sprockets. The chain may be removed as a complete assembly. Remove the camshaft sprocket from the camshaft. Mark its orientation for correct reinstallation. Remove crankshaft sprocket if necessary for chain routing.
11. 11

    Remove timing chain guide
    Locate the timing chain guide bolts (typically 2-3 bolts securing the guide to the engine block). Remove the guide bolts and extract the worn timing chain guide. Inspect the guide wear surface for plastic wear, cracks, or broken sections. Inspect the mating surface on the engine block for debris or damage. Clean mounting surface thoroughly.
    Torque spec

    Guide Bolts24 Nm (18 lb-ft)
12. 12

    Install new timing chain guide
    Position the new timing chain guide in its mounting location on the engine block. Ensure the guide is fully seated and aligned with mounting holes. Install guide bolts and tighten to specification. Verify the guide surface is smooth and properly positioned to support the timing chain during operation.
    Torque spec

    Guide Bolts24 Nm (18 lb-ft)
13. 13

    Reinstall timing chain and sprockets
    Install crankshaft sprocket onto crankshaft (if removed) with timing mark facing outward. Install the camshaft sprocket onto the camshaft, aligning the keyway/dowel. Route the timing chain over the crankshaft and camshaft sprockets, ensuring proper engagement with the crankshaft sprocket timing mark. Verify all timing marks align correctly as marked in step 7. Install camshaft sprocket bolts finger-tight initially.
14. 14

    Torque camshaft sprocket bolts
    Torque the single camshaft sprocket bolt to specification, preventing camshaft rotation as needed. Verify sprockets are fully seated on camshafts and timing marks remain aligned after torquing. Double-check timing alignment at TDC before proceeding.
    Torque spec

    Camshaft Sprocket Bolt75 Nm (55 lb-ft)
15. 15

    Install timing chain tensioner
    Compress the timing chain tensioner spring mechanism and lock it in the compressed position (using tensioner pin or appropriate method per OEM procedure). Install tensioner into its bore and secure with tensioner bolt torqued to specification. Release tensioner locking mechanism to apply tension to timing chain. Verify chain tension is proper and consistent.
    Torque spec

    Tensioner Bolt20 Nm (15 lb-ft)
16. 16

    Rotate engine and verify timing
    Manually rotate crankshaft two complete revolutions clockwise (normal rotation). Verify timing marks realign at TDC on cylinder #1 compression stroke. Check that timing chain rides smoothly on new guide without binding. Confirm all camshaft and crankshaft timing marks align correctly. If timing is off, repeat steps 8-15.
17. 17

    Install new crankshaft front seal
    Remove old crankshaft front seal from timing cover using seal puller or appropriate tool. Clean seal bore thoroughly. Lubricate new seal lip with engine oil. Install new crankshaft front seal into timing cover using seal driver, ensuring it is fully seated and square in bore.
18. 18

    Install timing cover
    Clean all gasket surfaces on engine block and timing cover thoroughly with plastic scraper. Install new timing cover gasket or apply RTV silicone gasket maker per OEM specification (typically a specific bead pattern). Position timing cover carefully onto engine block, ensuring proper alignment with dowel pins. Install timing cover bolts in their correct locations (8mm bolts in designated positions). Tighten bolts in sequence from center outward to specifications.
    Torque spec

    Timing Cover Bolts14 Nm (10 lb-ft)
19. 19

    Reinstall crankshaft pulley
    Clean crankshaft snout and pulley hub. Align pulley keyway with crankshaft key. Install pulley onto crankshaft snout. Apply small amount of engine oil to crankshaft pulley bolt threads (standard right-hand thread). Install bolt and tighten to specification using crankshaft holding tool to prevent rotation. Note: This bolt tightens clockwise when viewed from front.
    Torque spec

    Crankshaft Pulley Bolt176 Nm (130 lb-ft)
20. 20

    Reinstall front mount and accessories
    Install front engine mount to engine block and crossmember, torquing fasteners to specification. Remove engine support hoist. Reinstall water pump with new gasket, thermostat housing, A/C compressor, alternator, power steering pump, and idler pulleys. Reconnect all electrical connectors. Install serpentine belt.
21. 21

    Reinstall valve covers
    Install new valve cover gaskets on both valve covers. Position valve covers on cylinder heads and install valve cover bolts. Torque valve cover bolts in sequence from center outward to specification. Reinstall ignition coil packs and reconnect electrical connectors.
    Torque spec

    Valve Cover Bolts10 Nm (7 lb-ft)
22. 22

    Complete final assembly
    Reinstall throttle body and air intake system. Install new oil filter and fill engine with correct quantity of full synthetic engine oil per factory specification (approximately 8 quarts with filter — verify against owner's manual). Refill cooling system with the factory-specified HOAT coolant, 50/50 mix (verify total system capacity against the factory service manual before filling). Reconnect negative battery cable. Reinstall engine covers.

Reassembly

1. Timing alignment is critical - verify marks align at TDC before final assembly
2. Use only specified RTV silicone or OEM gaskets for timing cover - incorrect sealant can contaminate oil system
3. The crankshaft pulley bolt uses left-hand threads and must be torqued with crankshaft locked
4. Valve cover bolts must be torqued in sequence to prevent gasket leaks
5. Allow RTV silicone to cure per manufacturer specifications before starting engine if used

Verification

• Start engine and verify no coolant, oil, or fluid leaks from timing cover, valve covers, or accessory mounting points
• Listen for abnormal timing chain noise or rattles at idle and during acceleration
• Verify engine runs smoothly without misfires or rough idle (indicating proper timing)
• Monitor oil pressure gauge for normal pressure after startup
• Allow engine to reach operating temperature and verify cooling system holds pressure without leaks
• Check for proper serpentine belt tracking and accessory operation
• Perform a test drive and verify normal engine performance and power delivery

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