Timing Chain Kit

Complete replacement of timing chain, sprockets, guides, and tensioners on the 1992 Dodge Viper 8.0L V10 engine, requiring front accessory removal and timing cover disassembly.

Warnings

Tools required

Parts

• Timing chain kit (chains, sprockets, guides, tensioners) × 1 — Use OEM specification
• Timing cover gasket × 1 — Use OEM specification
• Front crankshaft seal × 1 — Use OEM specification
• Valve cover gaskets × 2 — Use OEM specification
• Water pump gasket (if disturbed) × 1 — Use OEM specification
• Oil filter × 1 — Use OEM specification
• Oil drain plug crush washer × 1 — Use OEM specification
• RTV silicone sealant (Mopar gray) × 1 — Use OEM specification
• Threadlocker (medium strength) × 1 — Loctite 242 or equivalent

Fluids

• 10W-30 conventional engine oil — 11 qt
• Ethylene glycol 50/50 coolant — 6 qt

Preparation

1. Park vehicle on level surface, engage parking brake, and place wheel chocks at rear wheels.
2. Disconnect negative battery cable and isolate terminal to prevent accidental reconnection.
3. Allow engine to cool completely (minimum 4 hours after last operation).
4. Raise and support front of vehicle on jack stands at manufacturer-specified jacking points.
5. Remove engine cover by releasing retaining clips.
6. Position oil drain pan under engine and remove oil drain plug to drain engine oil completely.
7. Position coolant drain pan under radiator and drain cooling system via petcock or lower radiator hose.
8. Install engine support fixture across engine bay or attach engine hoist to lifting eyes on cylinder heads to support engine weight.

Procedure

1. 1

   Remove Serpentine Belt and Accessories
   Using a breaker bar on the belt tensioner, rotate tensioner counterclockwise to release belt tension. Remove serpentine belt from all pulleys. Mark belt routing if original belt will be reused. Disconnect electrical connectors from alternator and mark for reinstallation. Remove alternator mounting bolts and set alternator aside with wiring attached. Disconnect power steering pump lines (if equipped), cap open lines, and remove power steering pump mounting bolts. Set pump aside without disconnecting hoses if possible. Disconnect A/C compressor electrical connector and remove compressor mounting bolts. Support compressor with wire without disconnecting refrigerant lines.
2. 2

   Remove Valve Covers
   Disconnect spark plug wire looms from valve covers on both cylinder banks. Remove ignition coil packs if they obstruct valve cover removal. Disconnect any breather hoses or PCV connections from valve covers. Remove valve cover bolts from both left and right valve covers, counting and noting the exact quantity per the factory service manual. Carefully lift valve covers from cylinder heads, breaking gasket seal if necessary with a plastic pry tool. Inspect valve train for wear while covers are removed.
3. 3

   Remove Water Pump and Front Accessories
   Disconnect upper and lower radiator hoses from water pump and engine. Remove water pump bolts (count and note locations as bolt lengths may vary). Remove water pump from timing cover and set aside with gasket. If oil cooler lines are present at front of engine, disconnect and cap to prevent contamination. Remove any remaining brackets or accessories that mount to the timing cover to provide clear access.
4. 4

   Remove Crankshaft Pulley and Harmonic Balancer
   Remove crankshaft pulley center bolt using a breaker bar or impact wrench. This bolt is torqued to a high value (verify exact torque spec in the factory service manual) and will require significant force. Install harmonic balancer puller onto balancer hub with bolts threading into balancer. Tighten puller center bolt to extract harmonic balancer from crankshaft snout. Do not use a jaw-type puller as this will damage the balancer. Once removed, inspect balancer for rubber deterioration or separation.
   Torque spec

   Crankshaft Pulley Bolt180 Nm (133 lb-ft)
5. 5

   Remove Timing Cover
   Remove all timing cover bolts, noting bolt sizes and lengths as they may vary by location. Count and organize bolts by size and location per the factory service manual before reassembly. Carefully pry timing cover away from engine block using plastic pry tools at designated pry points. Do not pry against machined gasket surfaces. Remove timing cover and inspect gasket surfaces for damage. Remove and discard old timing cover gasket and front crankshaft seal.
   ℹ️The timing cover may be sealed with RTV in addition to the gasket. Use patience when separating to avoid damaging aluminum cover.
6. 6

   Verify and Document Timing Marks
   Rotate crankshaft clockwise using crankshaft turning socket until cylinder 1 is at top dead center (TDC) on compression stroke. Verify that the timing mark on the single camshaft sprocket aligns with the timing mark on the crankshaft sprocket (dot-to-dot facing each other). This is the correct base timing alignment for the in-block camshaft. Take photographs of all timing mark positions before disassembly. Count and document the number of chain links between each timing mark for reference during reassembly. This engine uses a single timing chain and sprocket set driving the central in-block camshaft.
   ⚠Accurate documentation of timing mark positions is critical. Incorrect timing will cause valve-to-piston contact and severe engine damage.
7. 7

   Remove Timing Chain Tensioners
   Locate the timing chain tensioner/snubber for the single timing chain. Note its orientation and mounting before removal. Before removing tensioners, note their orientation and how the tensioner plunger contacts the timing chain guide. Remove tensioner mounting bolts and carefully extract tensioners. Inspect tensioners for hydraulic fluid leakage or mechanical wear. Verify that replacement tensioners come with retaining pins or compression clips installed.
   Torque spec

   Tensioner Bolt20 Nm (15 lb-ft)
8. 8

   Remove Timing Chains and Guides
   Remove timing chain guide bolts from both cylinder banks. There are typically 2-3 guide bolts per bank securing fixed guides and pivot guides. Remove the timing chain guides and set aside. Remove the camshaft sprocket retaining bolt(s) while holding the crankshaft from rotating. Remove the camshaft sprocket along with the single timing chain. If engine is equipped with idler sprockets, remove idler sprocket bolts and remove idler sprockets. Lift timing chains off crankshaft sprocket. Inspect all sprockets for wear, paying attention to tooth profiles and chain contact surfaces.
   Torque spec

   Camshaft Sprocket Bolt80 Nm (59 lb-ft)

   Guide Bolts24 Nm (18 lb-ft)

   Timing Chain Idler Sprocket25 Nm (18 lb-ft)
9. 9

   Remove Crankshaft Sprocket
   If crankshaft sprocket is keyed, note key position in crankshaft keyway. Remove crankshaft sprocket by pulling straight off crankshaft. If sprocket is tight, use a gear puller or carefully pry behind sprocket using two pry bars positioned opposite each other. Inspect crankshaft key for damage or wear. Remove key if replacement is included in timing chain kit. Clean crankshaft snout thoroughly with solvent and wipe dry.
10. 10

    Clean and Inspect Timing Components
    Thoroughly clean all timing cover gasket surfaces on engine block and timing cover using plastic gasket scraper. Remove all old gasket material and RTV sealant residue. Clean with brake cleaner or solvent and wipe dry with lint-free cloths. Inspect timing cover for cracks, warping, or damage. Check cylinder head timing chain guide mounting surfaces for wear or damage. Verify that all bolt holes are clean and threads are not damaged. Inspect oil passages in block for debris and clean if necessary.
11. 11

    Install New Crankshaft Sprocket and Chains
    Install crankshaft key (if equipped) into crankshaft keyway ensuring it is fully seated. Install new crankshaft sprocket onto crankshaft, aligning keyway with key. Tap sprocket gently with soft mallet if needed to fully seat. Rotate crankshaft so that crankshaft sprocket timing mark is in the 12 o'clock position. Install new timing chains onto crankshaft sprocket. If idler sprockets are used, install idler sprockets with new bolts and torque to specification. Route timing chains over idler sprockets according to factory routing diagram.
    Torque spec

    Timing Chain Idler Sprocket25 Nm (18 lb-ft)
12. 12

    Install Camshaft Sprockets
    Position camshaft sprockets with timing chains engaged, aligning sprocket bolt holes with camshaft bolt holes. Verify that timing marks on camshaft sprockets align with marks on cylinder heads or reference surfaces. Install camshaft sprocket bolts hand-tight. Rotate each camshaft sprocket as needed to align timing marks precisely. Hold camshaft stationary using wrench on camshaft hex while torquing camshaft sprocket bolts to specification. Double-check that all timing marks remain aligned after torquing.
    ⚠Verify timing mark alignment at each camshaft before final torquing. Misalignment will result in engine damage.
    Torque spec

    Camshaft Sprocket Bolt80 Nm (59 lb-ft)
13. 13

    Install Timing Chain Guides
    Install new timing chain guides for both cylinder banks in their original positions. Note that fixed guides and pivot guides have different mounting locations. Install timing chain guide bolts and torque to specification. Ensure guides are positioned correctly to contact timing chains without excessive deflection or binding. Verify that guides do not interfere with chain movement by manually rotating crankshaft two full revolutions and observing guide contact.
    Torque spec

    Guide Bolts24 Nm (18 lb-ft)
14. 14

    Install Timing Chain Tensioners
    Compress new timing chain tensioners and install retaining pins or clips to hold tensioners in compressed position. Install tensioners into their mounting locations on engine block, ensuring tensioner plungers contact timing chain guides correctly. Install tensioner mounting bolts and torque to specification. Do NOT remove tensioner retaining pins yet. Verify tensioner orientation and that they are fully seated before final torquing.
    Torque spec

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

    Verify Timing and Release Tensioners
    Using crankshaft turning socket, slowly rotate crankshaft clockwise two complete revolutions. Stop at TDC compression stroke for cylinder 1. Verify that all camshaft timing marks align correctly with their reference marks. Verify crankshaft timing mark alignment. If all marks align correctly, carefully remove tensioner retaining pins from both tensioners, allowing tensioners to apply pressure to timing chains. Rotate crankshaft an additional two revolutions and re-verify all timing marks. If timing marks do not align, disassemble and reinstall timing components correctly.
    ⚠️Do not start engine if timing marks do not align perfectly after tensioner release. Incorrect timing will cause immediate catastrophic engine damage.
16. 16

    Install Front Crankshaft Seal
    Install new front crankshaft seal into timing cover using seal driver or appropriately sized socket. Drive seal squarely into timing cover bore until flush with cover surface. Lubricate seal lip with clean engine oil. Verify seal is not cocked or damaged during installation.
17. 17

    Install Timing Cover
    Install new timing cover gasket onto engine block, using alignment dowels to position correctly. Apply thin bead of RTV silicone sealant at cylinder head-to-engine block junctions and oil pan-to-engine block junctions where gasket alone may not seal adequately. Position timing cover onto engine block, carefully guiding cover over crankshaft snout without damaging front seal. Install timing cover bolts in their correct locations, noting that 6mm, 8mm, and 10mm bolts go in specific positions. Hand-tighten all bolts first, then torque to the factory-specified values for each bolt size (verify exact torque specs in the factory service manual). Follow torque sequence from center outward if documented in service manual.
    ℹ️Allow RTV sealant to cure per manufacturer specifications before filling with coolant, typically 1 hour minimum.
    Torque spec

    Cover Bolts16 Nm (12 lb-ft)
18. 18

    Install Harmonic Balancer and Crankshaft Pulley
    Clean crankshaft snout and harmonic balancer bore with solvent and dry thoroughly. Apply thin film of clean engine oil to crankshaft snout. Slide harmonic balancer onto crankshaft, aligning keyway with crankshaft key if equipped. Tap balancer gently with soft mallet if needed to start onto crankshaft. Install crankshaft pulley bolt with washer and torque to the factory-specified value using a torque wrench (verify exact torque spec in the factory service manual). Verify that harmonic balancer is fully seated against crankshaft shoulder.
    Torque spec

    Crankshaft Pulley Bolt180 Nm (133 lb-ft)
19. 19

    Install Water Pump and Front Accessories
    Install new water pump gasket onto timing cover. Position water pump onto timing cover and install water pump bolts, torquing evenly in crisscross pattern. Reconnect radiator hoses to water pump with new hose clamps if originals are worn. Install any brackets or accessories that were removed from timing cover. Reconnect oil cooler lines if equipped.
20. 20

    Install Valve Covers and Accessories
    Install new valve cover gaskets onto cylinder heads, ensuring gaskets seat properly in grooves. Position valve covers onto cylinder heads and install valve cover bolts, torquing in sequence from center outward to 10 Nm. Do not overtighten valve cover bolts as this will distort covers and cause oil leaks. Reconnect breather hoses and PCV connections. Install ignition coil packs if removed. Install spark plug wire looms. Install A/C compressor with mounting bolts and reconnect electrical connector. Install power steering pump with mounting bolts and reconnect power steering lines if disconnected. Install alternator with mounting bolts and reconnect electrical connectors. Install serpentine belt following routing diagram, using tensioner tool to load belt tensioner.
    Torque spec

    Cover Bolts16 Nm (12 lb-ft)
21. 21

    Refill Fluids and Final Checks
    Install new oil filter and torque oil drain plug with new crush washer to the factory-specified value (verify in the service manual). Lower vehicle from jack stands. Fill engine with the factory-specified oil capacity (approximately 8 quarts with filter — verify in owner's/service manual) of the recommended engine oil grade. Refill cooling system with 50/50 ethylene glycol coolant mixture through radiator fill neck and overflow reservoir. Reconnect negative battery cable. Remove engine support fixture. Perform final visual inspection of all connections, belt routing, and fasteners. Check for any tools or parts left in engine bay.
    Torque spec

    Oil Drain Plug35 Nm (26 lb-ft)

Reassembly

1. Timing cover bolts must be torqued in sequence by size: 6mm bolts first, then 8mm, then 10mm bolts.
2. Valve cover bolts must be torqued in sequence from center outward to prevent gasket distortion.
3. All timing marks must align perfectly after tensioner release before proceeding with final reassembly.
4. Allow RTV sealant to cure minimum 1 hour before filling cooling system.

Verification

• Start engine and verify that it starts immediately without abnormal cranking time or hesitation.
• Listen for any abnormal timing chain noise, rattling, or knocking during idle and rev-up.
• Verify that engine idles smoothly without misfires or rough running.
• Check for oil leaks at valve covers, timing cover, and oil pan junctions.
• Check for coolant leaks at water pump, radiator hoses, and timing cover.
• Verify proper oil pressure on gauge after 30 seconds of operation.
• Allow engine to reach operating temperature and verify cooling fan operation.
• Perform test drive to verify normal engine performance under load.
• Re-check all fluid levels after test drive and top off as necessary.
• Re-inspect all fasteners and connections after engine has cooled from test drive.

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