Short Block Replacement

Complete removal and replacement of the short block assembly on a 2008 Dodge Viper 8.4L V10, requiring engine removal from vehicle, disassembly of cylinder heads and oil pan, and transfer of all external components to the new short block.

Warnings

Tools required

Parts

• Short block assembly (complete with pistons, rods, crankshaft, and block) × 1 — Use OEM or equivalent remanufactured unit
• Cylinder head gasket set (both banks) × 1 — Use OEM specification
• Oil pan gasket × 1 — Use OEM specification
• Front cover gasket × 1 — Use OEM specification
• Rear main seal × 1 — Use OEM specification
• Oil pump seal/gasket × 1 — Use OEM specification
• Intake manifold gasket set × 1 — Use OEM specification
• Exhaust manifold gaskets (set of 10) × 1 — Use OEM specification
• Valve cover gaskets (set of 2) × 1 — Use OEM specification
• Thermostat housing gasket × 1 — Use OEM specification
• Water pump gasket/O-rings × 1 — Use OEM specification
• Harmonic balancer bolt × 1 — Use OEM one-time-use bolt
• Cylinder head bolt set × 1 — Use OEM one-time-use bolt set
• Main bearing cap bolts (if not included with short block) × 1 — Verify with short block supplier
• Oil filter × 1 — Use OEM specification
• Spark plugs (set of 10) × 1 — Use OEM specification
• RTV silicone sealant (high-temp, oil-resistant) × 1 — Mopar or equivalent

Fluids

• 0W-40 full synthetic engine oil — 11 qt
• Mopar HOAT coolant 50/50 — 19 qt

Preparation

1. Park vehicle on level surface and engage parking brake. Chock rear wheels securely.
2. Disconnect negative battery cable, then positive battery cable. Remove battery from vehicle.
3. Relieve fuel system pressure by removing fuel pump fuse and cranking engine until it stalls.
4. Drain engine coolant completely from radiator petcock and engine block drain plugs into appropriate containers.
5. Drain engine oil and remove oil filter.
6. Drain manual transmission fluid if transmission removal is required for your lifting method.
7. Remove engine cover panels and any underbody splash shields.
8. Position engine hoist and verify adequate overhead clearance for engine removal.
9. Take detailed photographs of all hose routing, wiring harness positions, and component locations for reference during reassembly.
10. Have complete factory service manual available with torque specifications and tightening sequences.

Procedure

1. 1

   Remove intake and fuel system components
   Remove intake air box, air intake tubes, and throttle body assembly. Disconnect fuel lines from fuel rail using proper disconnect tools (fuel will spray - have rags ready). Remove fuel rail with injectors as an assembly, marking injector positions. Disconnect all vacuum lines from intake manifold, PCV system, and brake booster, labeling each connection. Remove intake manifold bolts and carefully lift manifold assembly from engine, noting any coolant passages that may drain.
2. 2

   Disconnect electrical and accessory systems
   Disconnect all engine electrical connectors including: alternator, starter, all 10 ignition coils, all 10 fuel injectors, coolant temperature sensors, oil pressure sensor, camshaft position sensors, crankshaft position sensor, knock sensors (both banks), throttle position sensor, and any other engine management sensors. Label each connector with tape and marker. Remove serpentine belt from all accessories. Remove alternator, power steering pump (leave hoses attached and secure pump aside), A/C compressor (leave refrigerant lines attached and secure compressor aside - do not open A/C system).
3. 3

   Remove exhaust system
   From underneath vehicle, disconnect exhaust system at header collectors. The V10 has separate exhaust manifolds for each bank feeding into collectors. Remove approximately 4-6 bolts per collector connection. Support exhaust with jack stands as you disconnect to prevent stress on hangers. Lower exhaust system down and away from engine area. If clearance requires, remove complete header assemblies from cylinder heads after removing the exhaust manifold bolts from each bank.
4. 4

   Drain and disconnect cooling system
   Disconnect upper and lower radiator hoses from engine. Disconnect heater hoses from engine block fittings on both sides of engine. Remove coolant bypass hoses and any auxiliary coolant lines to throttle body or oil cooler. Remove radiator fan assembly (electric fans with shroud). If required for clearance, remove complete radiator assembly by disconnecting transmission cooler lines (manual transmission may have oil cooler lines) and removing radiator mounting bolts.
5. 5

   Separate transmission from engine
   From underneath vehicle, support transmission with hydraulic transmission jack. Remove bellhousing-to-engine bolts (typically 6-8 bolts around perimeter of bellhousing). Disconnect clutch hydraulic line at transmission. Carefully slide transmission straight back away from engine, keeping input shaft aligned with clutch disc until transmission clears engine. Lower transmission on jack and move away from work area. Inspect clutch disc, pressure plate, and flywheel while accessible.
6. 6

   Prepare engine for removal
   Remove engine mount through-bolts on both left and right engine mounts. The Viper uses side-mount configuration. Attach engine hoist chains or straps to factory lifting points on cylinder heads (one per bank). Use load leveler on hoist to balance the engine. Take up slight tension on hoist to verify balance point before disconnecting remaining components. Perform final inspection to ensure all hoses, wires, and lines are disconnected from engine.
7. 7

   Remove engine from vehicle
   Slowly lift engine while guiding clear of engine bay. The Viper engine bay is tight - watch clearance on both sides, particularly around shock towers and body seams. Angle engine as needed using load leveler, typically nose-up slightly as it clears the front crossmember. Once clear of chassis, carefully move engine to prepared work area and lower onto heavy-duty engine stand. Bolt engine securely to stand using bellhousing bolt holes.
8. 8

   Remove external engine components
   With engine on stand, remove remaining external components that will transfer to new short block: water pump, thermostat housing, front timing cover, harmonic balancer (use proper puller - do not hammer), oil pump (crankshaft-driven, located at front of block behind timing cover), starter motor, engine lifting brackets, coolant crossover pipes, any remaining sensor brackets, and motor mount brackets. Remove valve covers from both cylinder heads. Rotate engine on stand as needed for access.
9. 9

   Remove cylinder heads
   Remove ignition coils and spark plugs from all 10 cylinders. Following factory reverse torque sequence (consult service manual for your specific V10 - typically loosened in stages from outside-in pattern), loosen and remove all cylinder head bolts from left bank. These are torque-to-yield bolts - discard them. Carefully lift left cylinder head from block, using lift points if provided. Place head on clean padded surface. Repeat process for right bank cylinder head. Remove and retain rocker arms, pushrods, and lifters if they will be reused, keeping them organized by cylinder position. Inspect cylinder head mating surfaces on old block for damage.
10. 10

    Remove oil pan and windage tray
    With engine inverted on stand, remove oil pan bolts completely around perimeter of pan (approximately 20-24 bolts). Carefully break seal using plastic gasket scraper - do not pry between sealing surfaces. Remove oil pan and gasket. Remove windage tray if equipped (typically 4-6 bolts). Remove oil pickup tube from main cap/block (usually 2-3 bolts). Inspect oil pump drive mechanism and note orientation for reinstallation.
11. 11

    Transfer components to new short block
    Position new short block on engine stand securely. Verify new short block includes: crankshaft installed, main caps torqued, pistons and rods installed, cam bearings installed, block properly cleaned and prepared. Install oil pump drive components in same orientation as removed. Install new oil pickup tube with new gasket/O-ring. Install new windage tray. Install new oil pan gasket (or apply RTV per factory specification pattern) and install oil pan, torquing bolts in crisscross pattern from center outward.
12. 12

    Install cylinder heads
    Clean cylinder head mating surfaces on new block thoroughly - no debris or old gasket material. Install new head gaskets on block, ensuring correct orientation (usually marked TOP or FRONT). Check locating dowel pins are in place. If reusing lifters and pushrods, install them in original positions with assembly lube. Carefully lower left cylinder head onto block, aligning over dowel pins. Install new cylinder head bolts finger-tight in all positions. Following factory torque sequence for your V10 (typically inside-out pattern in multiple stages), torque head bolts to specification plus angle rotation as required. Repeat entire process for right cylinder head installation.
13. 13

    Reinstall external components
    Install front timing cover with new gasket/seal. Install harmonic balancer using proper installation tool and new bolt (torque-to-yield - do not reuse old bolt). Install water pump with new gasket/O-rings. Install thermostat housing with new gasket. Reinstall all brackets, lifting points, motor mounts, and external sensors removed in step 8. Install valve covers with new gaskets on both banks. Install starter motor. Rotate engine on stand to verify all components are secure before removal from stand.
14. 14

    Install engine in vehicle
    Attach hoist to engine lifting points with proper balance. Remove engine from stand and carefully maneuver into engine bay, reversing removal process. Angle engine nose-up slightly to clear front crossmember, then lower into position. Align engine mounts with chassis mount brackets. Install engine mount through-bolts finger-tight on both sides. Verify engine sits level and centered in bay before fully tightening mount bolts.
15. 15

    Reconnect transmission and driveline
    Support transmission on hydraulic jack and align with engine bellhousing. Guide transmission input shaft carefully into clutch disc splines - may require slight rotation of output shaft to align. Slide transmission fully forward until bellhousing seats against engine block. Install all bellhousing-to-engine bolts and torque to specification. Reconnect clutch hydraulic line. Remove transmission jack.
16. 16

    Reinstall cooling system
    If radiator was removed, reinstall and secure it. Reconnect transmission cooler lines or oil cooler lines. Install radiator fan assembly. Reconnect upper and lower radiator hoses with new clamps. Reconnect heater hoses to engine block fittings. Install coolant bypass hoses and auxiliary coolant lines. Ensure all hose clamps are positioned properly and tightened securely.
17. 17

    Reinstall exhaust system
    Raise exhaust system into position (or if headers were removed, install headers to cylinder heads with new gaskets first). Connect exhaust at collector flanges with new gaskets. Install and torque all exhaust flange bolts. Verify exhaust system hangs properly with no contact on chassis, heat shields, or driveline components.
18. 18

    Reconnect electrical and accessory systems
    Install A/C compressor and power steering pump to mounting brackets. Install alternator. Install and tension serpentine belt on all pulleys - verify correct routing. Reconnect all electrical connectors using labels from disassembly: alternator, starter, all ignition coils, all fuel injectors, sensors (coolant temp, oil pressure, camshaft position, crankshaft position, knock sensors on both banks), and engine management connectors. Double-check each connection is fully seated and locked.
19. 19

    Reinstall intake and fuel systems
    Install intake manifold with new gaskets, torquing bolts in proper sequence from center outward. Reconnect all vacuum lines to labeled positions (PCV, brake booster, etc.). Install fuel rail with injectors, ensuring injectors seat properly in manifold with new O-rings. Connect fuel lines using proper quick-connect procedure. Install throttle body assembly with new gasket. Install intake tubes and air box assembly.
20. 20

    Prime lubrication system and fill fluids
    Install new oil filter. Using an oil pump priming tool through the oil pressure sender port (the Viper V10 has no distributor), prime oil system until oil pressure is observed. This ensures bearing lubrication before initial start. Fill engine with approximately 8 quarts of 0W-40 full synthetic engine oil (verify exact capacity against factory service manual). Fill cooling system with Mopar HOAT 50/50 coolant mixture to factory-specified capacity (verify exact capacity against service manual) - fill slowly to avoid air pockets. Fill manual transmission with the factory-specified Mopar manual transmission fluid to the correct capacity if drained (verify fluid type and quantity against the service manual). Reinstall battery and connect positive cable, then negative cable.
21. 21

    Initial start and break-in procedure
    Verify all tools and materials are clear of engine bay. Verify all fluid levels. Turn ignition to ON position without starting - check for fuel leaks at rail and lines. Install fuel pump fuse. Start engine and immediately verify oil pressure on gauge (should register within 5 seconds). Let engine idle and monitor for any leaks (coolant, oil, fuel). Monitor coolant temperature - engine should reach operating temperature with thermostat opening and upper radiator hose becoming hot. Burp cooling system by loosening highest coolant bleed point until air-free coolant flows. Check and adjust coolant level. Run engine through varying RPM ranges per short block manufacturer's break-in recommendations (typically 20-30 minutes of varied idle to 3000 RPM cycles avoiding sustained high load). Shut down, allow to cool, and recheck all fluid levels.

Reassembly

1. Torque all fasteners to factory specifications in proper sequences - cylinder head bolts and main bearing caps are critical and use multi-stage torque-plus-angle procedures
2. Replace all one-time-use fasteners including cylinder head bolts, main cap bolts, and harmonic balancer bolt
3. Use new gaskets for all mating surfaces - do not reuse head gaskets, intake gaskets, or exhaust gaskets
4. Apply RTV sealant only where factory specifications call for it - improper sealant use can block oil passages
5. Verify valve timing alignment if timing components were disturbed during procedure
6. Fill all fluids to proper capacities and use specified fluid types only

Verification

• Confirm oil pressure registers immediately upon start and maintains 25+ PSI at idle when warm
• Verify no coolant, oil, or fuel leaks after initial run and cool-down period
• Check coolant level after burping system and top off as needed
• Confirm all electrical systems function properly (gauges, sensors, charging system)
• Verify engine runs smoothly without misfires, unusual noises, or excessive vibration
• Confirm exhaust system has no leaks at manifold or collector connections
• After 500 miles, change oil and filter, retorque cylinder head bolts if specified by manufacturer, and recheck all fluid levels

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