Valve Job - Complete

Complete valve job procedure for 1992 Dodge Viper 8.0L V10, including cylinder head removal, valve train disassembly, machine shop valve reconditioning, and reassembly with new gaskets and seals.

Warnings

Tools required

Parts

• Cylinder head gasket set (both banks) × 2 — Use OEM specification
• Valve cover gasket set × 2 — Use OEM specification
• Intake manifold gasket set × 1 — Use OEM specification
• Exhaust manifold gaskets × 2 — Use OEM specification
• Valve stem seals (set of 20) × 1 — Use OEM specification
• Timing cover gasket × 1 — Use OEM specification
• Cylinder head bolts (TTY, complete set) × 1 — Use OEM specification
• Coolant × 1 — Ethylene glycol 50/50
• Engine oil and filter × 1 — 10W-30 conventional
• Anti-seize compound × 1 — High temperature rated
• RTV gasket maker (sensor safe) × 1 — Use OEM specification

Fluids

• engine_oil — 11 qt
• coolant — 24 qt

Preparation

1. Position vehicle on level surface and engage parking brake. Place wheel chocks at rear wheels.
2. Disconnect negative battery cable and secure away from terminal.
3. Remove engine cover panels and air intake assembly.
4. Drain cooling system completely into appropriate container. Open radiator petcock and remove lower radiator hose.
5. Drain engine oil and replace drain plug.
6. Label and photograph all vacuum lines, electrical connections, and hose routing before removal.
7. Support engine from above using engine support bar or hoist attachment. Engine will lose support points during disassembly.
8. Prepare organized workspace with labeled containers for fasteners, organized by bank and component.

Procedure

1. 1

   Remove Accessory Drive Components
   Remove serpentine belt by releasing tensioner. Remove alternator, power steering pump (position aside with lines attached), and A/C compressor (position aside with lines attached - do not disconnect refrigerant lines). Remove accessory brackets as needed for cylinder head access. Label all mounting hardware by component.
2. 2

   Remove Intake Manifold Assembly
   Disconnect throttle linkage, fuel lines, and all electrical connectors from intake manifold. Release fuel pressure at Schrader valve before disconnecting fuel lines. Remove intake manifold bolts in reverse of tightening sequence (outside to inside pattern). Lift intake manifold assembly away from engine. Inspect manifold gaskets and clean all mating surfaces.
   ⚠️Relieve fuel system pressure before disconnecting fuel lines. Fuel under pressure can spray and cause fire or injury.
   Torque spec

   Intake Manifold Bolt25 Nm (18 lb-ft)
3. 3

   Remove Exhaust Manifolds
   Disconnect exhaust pipes from exhaust manifolds at collector flanges. Remove exhaust manifold fasteners from both banks. Note that exhaust manifolds have multiple studs and nuts - work from center outward to avoid warping. Remove exhaust manifolds and gaskets. Inspect manifold surfaces for cracks or warping.
   Torque spec

   Exhaust Manifold Nuts25 Nm (18 lb-ft)
4. 4

   Remove Valve Covers
   Disconnect ignition coil harnesses and spark plug wires. Label spark plug wire positions. Remove valve cover bolts in crisscross pattern from both banks. Carefully lift valve covers away - they may be sealed with RTV in addition to gaskets. Clean all gasket material from valve cover mating surfaces on cylinder heads.
   Torque spec

   Valve Cover Bolts10 Nm (7 lb-ft)
5. 5

   Remove Timing Chain Cover and Set Timing Marks
   Remove crankshaft pulley/harmonic balancer using appropriate puller tool. Remove timing chain cover bolts and carefully pry cover away from block. Before removing timing chain, rotate engine to TDC cylinder #1 using the factory timing marks (align crankshaft sprocket timing mark and camshaft sprocket timing marks per FSM specification). Use paint or scribe to mark timing chain position on both camshaft sprockets and crankshaft sprocket. Photograph timing mark alignment for reference. Mark chain direction of rotation.
   ⚠Timing marks MUST be documented before chain removal. Even slight misalignment on reassembly will cause catastrophic valve-to-piston contact.
   Torque spec

   Timing Cover Bolts - 8mm25 Nm (18 lb-ft)
6. 6

   Remove Timing Chain and Camshaft Sprockets
   Remove timing chain tensioner bolt and extract tensioner assembly. Remove camshaft sprocket bolts from both camshafts while holding camshaft hex with wrench to prevent rotation. Slide both camshaft sprockets forward off camshafts with timing chain still engaged. Remove timing chain as an assembly with both sprockets attached. Store timing chain assembly together to maintain orientation.
   Torque spec

   Timing Chain Tensioner Bolt25 Nm (18 lb-ft)

   Camshaft Sprocket Bolts41 Nm (30 lb-ft)
7. 7

   Remove Camshaft Assemblies
   Examine camshaft bearing caps - they are numbered and have directional arrows. Record cap positions and orientation. Loosen camshaft cap bolts in reverse sequence (outward from center) in multiple passes, no more than 1/4 turn per pass to release valve spring pressure evenly. Remove all camshaft caps and store in order. Carefully lift camshafts straight up from cylinder heads. Inspect camshaft lobes and bearing journals for wear or scoring. Store camshafts in protected location.
   ⚠Camshaft caps MUST be reinstalled in exact original positions and orientation. Caps are machined as matched sets with their cylinder head.
   Torque spec

   Camshaft Cap Bolts14 Nm (10 lb-ft)
8. 8

   Remove Rocker Arms and Hydraulic Lash Adjusters
   Remove rocker arms from both cylinder heads. Remove the rocker arms/cam followers, noting the valve lash adjustment method used on this engine. Verify against the factory service manual whether hydraulic lash adjusters or shim/bucket-type followers are used before proceeding. Place all rocker arms and lash adjusters in numbered order corresponding to their cylinder and valve position. Do not mix components between positions. Inspect rocker arm contact surfaces and lash adjuster plungers for wear or scoring.
   Torque spec

   Rocker Arm Bolts30 Nm (22 lb-ft)
9. 9

   Remove Cylinder Heads
   Disconnect any remaining coolant hoses, sensors, or electrical connections from cylinder heads. Remove cylinder head bolts in reverse of tightening sequence (outside to inside spiral pattern) from both heads. Bolts should be loosened gradually in multiple passes. Once all bolts are removed, carefully break cylinder head seal using plastic wedges or soft pry points at designated pry locations - never pry on gasket surfaces. Lift cylinder heads straight up off engine block. Place heads on clean wooden blocks with combustion chambers facing up.
   ⚠Cylinder head bolts are torque-to-yield and must be discarded. Purchase complete new bolt set before reassembly.
   Torque spec

   Cylinder Head Bolts65 Nm (48 lb-ft)
10. 10

    Remove Valves from Cylinder Heads
    Using OHC-type valve spring compressor, compress first valve spring until keepers are accessible. Remove valve keepers using magnetic pickup tool. Slowly release spring compressor and remove valve spring retainer, valve spring, and valve spring seat. Carefully extract valve from combustion chamber side of head. Remove and discard valve stem seal. Repeat for all 20 valves (10 per head). Store all valves in numbered order matching their original positions. Keep intake and exhaust valves separated and labeled by cylinder.
11. 11

    Clean and Inspect Components
    Thoroughly clean all valve train components, cylinder heads, and block mating surfaces. Remove all carbon deposits from combustion chambers, valve faces, and ports. Clean valve guides with appropriate brush. Scrape all gasket material from cylinder head and block deck surfaces using plastic scrapers - do not gouge surfaces. Clean cylinder head bolt holes in block using thread chaser and compressed air. Inspect cylinder heads for cracks, especially between valve seats. Check deck surfaces for warpage using straightedge and feeler gauges. Measure valve stem-to-guide clearance using dial indicator. Document all measurements.
12. 12

    Transport Heads and Valves to Machine Shop
    Package cylinder heads and valves securely for transport to qualified machine shop. Include all measurements and inspection notes. Typical valve job includes: valve face grinding, valve seat reconditioning, valve guide inspection/replacement if needed, pressure testing, and deck surface milling if warped beyond specification. Ensure machine shop will install new valve stem seals after valve work is complete. Request final measurement documentation including deck height, valve seat concentricity, and spring installed height.
13. 13

    Inspect and Measure Returned Components
    Upon return from machine shop, verify all valve work was completed. Check that new valve stem seals are installed. Measure valve spring free height and installed height against specifications. Verify valve stem lengths are within specification. Test valve sealing by applying light solvent to back of valve and checking for leakage past seat. Ensure all carbon and machining debris is cleaned from heads.
14. 14

    Install Valves into Cylinder Heads
    Lubricate valve stems with assembly lube or clean engine oil. Insert each valve into its original (or assigned) guide from combustion chamber side. Valve stem seals should already be installed by machine shop. Install valve spring seat, valve spring (verify correct orientation - closely-wound coils typically face cylinder head), and spring retainer over valve stem. Compress spring with valve spring compressor and install valve keepers in stem groove. Carefully release compressor and verify keepers are properly seated. Tap valve stem tip lightly with plastic mallet to ensure keepers are locked. Repeat for all 20 valves in both heads.
15. 15

    Prepare Block and Install Cylinder Head Gaskets
    Final-clean engine block deck surface with brake cleaner and lint-free cloth. Verify all coolant and oil passages are clear. Install new cylinder head locating dowels if originals are damaged. Place new cylinder head gaskets on block, ensuring correct orientation - gaskets are marked 'Front' or 'Top' and are bank-specific. Align gasket over dowel pins. Do not apply sealant to head gaskets unless specifically required by gasket manufacturer. Verify all bolt holes align with gasket openings.
16. 16

    Install Cylinder Heads
    Carefully lower cylinder heads onto block, aligning with dowel pins and gasket. Guide heads straight down to avoid gasket shifting. Install new cylinder head bolts finger-tight in all positions. Beginning from center bolts, tighten head bolts in the factory sequence (spiral pattern from center outward) to the initial torque value specified in the FSM. Following the same sequence, apply the additional torque-angle passes exactly as specified in the factory service manual. Confirm all torque and angle values against the Viper FSM before proceeding. Mark bolts with paint pen after each angle pass to track progress.
    ⚠️Cylinder head bolts MUST be new TTY bolts. Follow torque-plus-angle procedure exactly. Incorrect tightening will cause head gasket failure.
    Torque spec

    Cylinder Head Bolts65 Nm (48 lb-ft)
17. 17

    Install Hydraulic Lash Adjusters and Rocker Arms
    Install hydraulic lash adjusters into their original bores in cylinder heads. Adjusters should slide in smoothly with light oil coating. Install rocker arms over lash adjusters and valve stem tips, ensuring proper engagement. Rotate each camshaft journal position to verify cam lobe is pointing away from rocker arm before installing rocker arm bolt (this prevents valve spring preload during installation). Install and torque rocker arm fasteners to the value specified in the factory service manual. Work systematically through all 20 valve positions.
    Torque spec

    Rocker Arm Bolts30 Nm (22 lb-ft)
18. 18

    Install Camshafts and Bearing Caps
    Lubricate all camshaft bearing journals and lobes with assembly lube or engine oil. Carefully lower camshafts into cylinder heads, ensuring they seat fully in journal bores. Lubricate camshaft cap bearing surfaces. Install camshaft bearing caps in exact original positions - verify cap numbers and directional arrows match original orientation. Install cap bolts finger-tight. Tighten camshaft cap bolts in sequence from center caps outward in multiple passes until reaching the final torque specified in the factory service manual. This gradual tightening prevents binding and allows valve spring pressure to seat evenly.
    ⚠Camshaft caps must be installed in original positions. Swapping caps will cause immediate bearing failure.
    Torque spec

    Camshaft Cap Bolts14 Nm (10 lb-ft)
19. 19

    Install Timing Chain and Set Timing
    Verify crankshaft is still at TDC position (keyway at 12 o'clock). Install both camshaft sprockets onto camshafts with timing chain engaged on sprockets, aligning all timing marks exactly as documented during disassembly. Hold camshafts steady using wrench on hex sections and install camshaft sprocket bolts torqued to the value specified in the factory service manual. Install timing chain tensioner (compress tensioner piston and install retaining pin before installation, then remove pin after tensioner bolt is torqued). Torque tensioner bolt to the value specified in the factory service manual. Rotate engine two complete revolutions by hand and verify timing marks realign at TDC. Check for any binding or interference.
    ⚠️Verify timing mark alignment by rotating engine manually two full revolutions. Incorrect timing will cause immediate valve-to-piston contact when engine starts.
    Torque spec

    Camshaft Sprocket Bolts41 Nm (30 lb-ft)

    Timing Chain Tensioner Bolt25 Nm (18 lb-ft)
20. 20

    Install Timing Chain Cover
    Clean timing cover and block mating surfaces. Install new timing cover gasket or apply thin bead of RTV sealant per manufacturer instructions. Position timing cover over crankshaft and align with bolt holes. Install timing cover bolts and tighten in sequence to the torque value specified in the factory service manual. Allow RTV to cure per manufacturer specifications before adding coolant. Install crankshaft harmonic balancer/pulley and torque to specification.
    Torque spec

    Timing Cover Bolts - 8mm25 Nm (18 lb-ft)
21. 21

    Install Valve Covers
    Install new valve cover gaskets in valve cover grooves. Apply small dab of RTV at front corners where timing cover meets cylinder heads. Position valve covers onto cylinder heads and install bolts finger-tight. Tighten valve cover bolts in crisscross sequence to the torque value specified in the factory service manual to ensure even gasket compression. Reconnect ignition coil harnesses. Install spark plug wires in documented positions.
    Torque spec

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

    Install Exhaust Manifolds
    Install new exhaust manifold gaskets on cylinder heads. If the factory service manual permits anti-seize on exhaust manifold studs, apply it sparingly and adjust torque per the lubricated fastener specification; otherwise install studs/nuts dry per FSM. Position exhaust manifolds and install nuts finger-tight. Working from center fasteners outward, torque exhaust manifold nuts to the value specified in the factory service manual. Reconnect exhaust pipes to manifold collectors with new gaskets.
    Torque spec

    Exhaust Manifold Nuts25 Nm (18 lb-ft)
23. 23

    Install Intake Manifold
    Install new intake manifold gaskets on cylinder heads, ensuring proper orientation and alignment with all ports. Position intake manifold assembly onto engine, guiding carefully to avoid gasket displacement. Install intake manifold bolts finger-tight. Tighten intake manifold bolts in the factory sequence to the torque value specified in the factory service manual. Reconnect all vacuum lines, fuel lines, electrical connectors, and throttle linkage per documentation and photos from disassembly.
    Torque spec

    Intake Manifold Bolt25 Nm (18 lb-ft)
24. 24

    Reinstall Accessory Components
    Reinstall accessory brackets, A/C compressor, power steering pump, and alternator using documented bolt locations. Torque each accessory and bracket fastener to its individual specification listed in the factory service manual. Install serpentine belt per routing diagram. Remove engine support equipment.
    Torque spec

    Sensor Mounting Bolts11 Nm (8 lb-ft)
25. 25

    Refill Fluids and Perform Initial Start
    Install new engine oil filter and refill engine with the capacity and viscosity of engine oil specified in the factory service manual. Close coolant drain and refill cooling system with the capacity specified in the factory service manual using a 50/50 ethylene glycol coolant mixture. Bleed cooling system per factory procedure. Reconnect negative battery cable. Before starting, turn engine over briefly with starter while monitoring oil pressure gauge to verify oil pressure builds. Start engine and allow to idle. Monitor for leaks at all gasket surfaces. Check and adjust coolant level after engine reaches operating temperature. Perform final torque verification on all critical fasteners after engine cools.
    ⚠Monitor oil pressure immediately upon startup. If pressure does not build within 10 seconds, shut down and investigate.

Reassembly

1. Reassembly follows reverse order of disassembly with critical attention to torque sequences and angle tightening for cylinder head bolts.
2. All cylinder head bolts must be replaced with new TTY bolts - reuse will cause failure.
3. Camshaft bearing caps must be installed in exact original positions and orientation.
4. Timing chain alignment must be verified by rotating engine two full revolutions and confirming marks realign.
5. Gasket surfaces must be completely clean and free of debris before installation.
6. Use new gaskets for all removed components - do not reuse head gaskets, valve cover gaskets, or intake/exhaust gaskets.
7. Apply anti-seize to exhaust manifold fasteners to prevent future seizure.

Verification

• Verify engine oil pressure builds immediately upon startup and maintains normal pressure at idle.
• Check for coolant, oil, or fuel leaks at all disturbed connections and gasket surfaces.
• Verify engine idles smoothly without misfires or unusual noises - ticking, grinding, or rattling indicates improper assembly.
• Confirm timing mark alignment by manually rotating engine two complete revolutions before starting.
• Monitor engine temperature to ensure proper cooling system operation and thermostat function.
• After engine reaches operating temperature and cools, verify no coolant or oil leaks have developed.
• Road test vehicle under light load and verify smooth acceleration and power delivery without hesitation.
• Recheck valve cover, intake manifold, and exhaust manifold bolt torques after initial heat cycle.

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