Head Gasket - Single

Complete procedure for replacing the head gasket on one bank of the 3.0L V6 twin turbo engine, including cylinder head removal, gasket replacement, and reassembly with proper torque sequence.

Warnings

Tools required

Parts

• Cylinder head gasket (bank-specific) × 1 — Use OEM specification
• Cylinder head bolts (TTY) × 1 — Use OEM specification - must be new
• Exhaust manifold gaskets × 1 — Use OEM specification
• Intake manifold gaskets × 1 — Use OEM specification
• Valve cover gasket × 1 — Use OEM specification
• Coolant temperature sensor O-ring × 1 — Use OEM specification
• Timing chain cover gasket × 1 — Use OEM specification
• Turbocharger oil feed line gaskets × 1 — Use OEM specification
• Anti-seize compound × 1 — High temperature rated

Fluids

• Selenia Racing 10W-60 engine oil — 5.5 qt
• Maserati OAT Coolant — 10 qt

Preparation

1. Ensure engine is completely cool before beginning work
2. Disconnect negative battery cable and wait 10 minutes for airbag system discharge
3. Remove engine cover by pulling upward on front clips
4. Place vehicle on lift and raise to comfortable working height
5. Remove underbody panels to access oil drain plug and coolant drain
6. Drain engine oil completely and reinstall drain plug
7. Drain cooling system from radiator petcock and lower hose
8. Lower vehicle and prepare engine bay for cylinder head removal
9. Remove air intake system including both turbo inlet pipes
10. Label and photograph all electrical connections, vacuum lines, and coolant hoses before disconnection

Procedure

1. 1

   Remove intake manifold and fuel system components
   Relieve fuel system pressure by removing fuel pump fuse and running engine until it stalls. Disconnect fuel rail and injector harnesses. Remove throttle body connections. Unbolt and remove intake manifold assembly, noting bolt positions as they may be different lengths. Remove fuel rail with injectors attached as an assembly.
2. 2

   Remove exhaust manifold and turbocharger connections
   Disconnect oxygen sensors from exhaust manifold. Remove turbocharger oil feed and return lines from the cylinder head being serviced. Unbolt exhaust manifold from cylinder head and carefully remove. If working on bank with turbocharger mounted directly, disconnect turbo oil lines but turbo can remain attached to exhaust manifold during removal.
   ⚠Exhaust studs are fragile and may break. Apply penetrating oil 24 hours before removal if possible.
3. 3

   Remove valve cover and accessory components
   Disconnect ignition coils and remove from cylinder head. Remove valve cover bolts in reverse of tightening sequence (outside to inside pattern). Carefully lift valve cover away, breaking seal if necessary with plastic pry tool. Remove any remaining coolant pipes, sensors, or brackets attached to the cylinder head.
4. 4

   Lock timing chain and prepare for head removal
   Rotate engine to TDM (Top Dead Center) for cylinder 1 on the bank being serviced. Install camshaft locking tools to both intake and exhaust camshafts. Install timing chain locking tool to prevent chain from jumping position. Mark timing chain position relative to camshaft sprockets with paint marker for reassembly reference.
   ⚠️Failure to properly lock timing components will result in timing chain misalignment and engine damage upon restart.
5. 5

   Remove camshaft components
   With timing locked, unbolt camshaft sprockets from camshafts. Mark sprockets for position. Remove camshaft bearing cap bolts in reverse order (outside to inside, multiple passes). Carefully lift camshafts from cylinder head and place on clean surface. Keep bearing caps with their respective camshaft and in order.
6. 6

   Remove cylinder head bolts and head assembly
   Loosen cylinder head bolts in reverse of tightening sequence (from center outward in multiple passes). Remove all cylinder head bolts and discard - they cannot be reused. Carefully break cylinder head seal using plastic pry points at designated lifting locations. Lift cylinder head straight up to avoid damaging block surface or timing chain. Place on clean padded surface.
   ⚠Do not pry between head and block surfaces. Use only designated lifting points to avoid damage to sealing surfaces.
7. 7

   Inspect and clean mating surfaces
   Remove old head gasket from block surface. Use plastic scraper and gasket remover solvent to clean all gasket material from both cylinder head and engine block surfaces. Clean cylinder bores of any debris. Inspect cylinder head for warpage using straight edge and feeler gauge - maximum allowable warpage is 0.05mm. Inspect for cracks using dye penetrant method if head overheating is suspected.
   ⚠Aluminum surfaces scratch easily. Never use wire brushes or metal scrapers on sealing surfaces.
8. 8

   Install new head gasket and position cylinder head
   Verify block and head surfaces are completely clean and dry. Install new head gasket on block with 'TOP' or 'ALTO' marking facing upward. Align gasket locating dowels. Verify timing chain is still properly positioned and locked. Carefully lower cylinder head onto block, aligning with dowel pins. Ensure head seats fully on gasket.
9. 9

   Install and torque cylinder head bolts
   Install NEW cylinder head bolts finger-tight in all positions. Following the proper sequence (center outward pattern), torque all bolts to Step 1 specification of 40 Nm (30 lb-ft). Then torque all bolts in sequence to Step 2 specification of 80 Nm (59 lb-ft). Using angle gauge, rotate each bolt in sequence an additional 90 degrees for Step 3. Finally, rotate each bolt in sequence another 90 degrees for Step 4. Total rotation after Step 2 is 180 degrees.
   ⚠️Must use NEW TTY cylinder head bolts. Using old bolts will result in improper clamping force and head gasket failure.
   Torque spec

   Cylinder Head Bolts - Step 140 Nm (30 lb-ft)

   Cylinder Head Bolts - Step 280 Nm (59 lb-ft)

   Cylinder Head Bolts - Step 30 Nm (0 lb-ft) + 90°

   Cylinder Head Bolts - Step 40 Nm (0 lb-ft) + 90°
10. 10

    Reinstall camshafts and timing components
    Lubricate camshaft journals and bearing caps with clean engine oil. Install camshafts in correct positions (intake/exhaust marked). Install bearing caps in original positions and torque in sequence from center outward in multiple passes. Install camshaft sprockets and align with timing marks made during disassembly. Remove timing chain locking tool and camshaft locking tools. Rotate engine two complete revolutions by hand and verify timing marks realign correctly.
    ⚠Verify timing alignment after rotating engine. Misalignment indicates incorrect installation.
11. 11

    Install valve cover and accessories
    Install new valve cover gasket. Clean valve cover and cylinder head mating surfaces. Position valve cover and install bolts, tightening in sequence from center outward to prevent gasket distortion. Reinstall ignition coils and connect electrical connections. Reinstall any coolant sensors, temperature sensors, or brackets removed earlier.
12. 12

    Install exhaust manifold
    Install new exhaust manifold gaskets on cylinder head. Position exhaust manifold (with or without turbocharger attached) and install new nuts. Apply anti-seize compound to exhaust stud threads. Torque exhaust manifold nuts to 25 Nm (18 lb-ft) in center-outward pattern. Reconnect turbocharger oil feed and return lines with new gaskets. Connect oxygen sensors.
    ℹ️Anti-seize compound is critical for future exhaust manifold service.
    Torque spec

    Exhaust Manifold Nuts25 Nm (18 lb-ft)
13. 13

    Install intake manifold and fuel system
    Install new intake manifold gaskets on cylinder head. Position intake manifold and install bolts finger-tight. Torque intake manifold bolts to 25 Nm (18 lb-ft) in proper sequence (center outward pattern). Reinstall fuel rail assembly with injectors. Connect all fuel lines ensuring proper seating. Reconnect throttle body connections and all vacuum lines per reference photos.
    Torque spec

    Intake Manifold Bolts25 Nm (18 lb-ft)
14. 14

    Complete reassembly and fill fluids
    Reinstall air intake system and turbo inlet pipes. Reconnect all remaining electrical connections, ensuring connectors click fully into place. Install engine cover. Fill cooling system with 10 quarts Maserati OAT coolant, burping system at bleed screw on thermostat housing. Fill engine with 5.5 quarts Selenia Racing 10W-60 oil. Reconnect battery negative terminal.
15. 15

    Initial startup and break-in procedure
    Before starting, turn ignition to ON position without starting to prime fuel system. Crank engine while monitoring for proper oil pressure. Once started, allow engine to idle and reach operating temperature while monitoring for leaks at head gasket, valve cover, intake, and exhaust. Check coolant level and top off as necessary after burping. Monitor for any abnormal noises or vibrations.
    ⚠If any coolant, oil, or exhaust leaks are observed, shut down immediately and address before continuing operation.

Reassembly

1. Reinstall all underbody panels removed during preparation
2. Perform complete visual inspection of engine bay for any disconnected hoses, wires, or loose components
3. Reset any fault codes that may have been stored during battery disconnection using appropriate scan tool
4. Document repair with date, mileage, and parts used for service records

Verification

• Check for coolant leaks around cylinder head perimeter, especially near timing chain cover and rear of head
• Check for oil leaks at valve cover and cylinder head mating surfaces
• Verify no exhaust leaks at manifold-to-head connection
• Confirm engine runs smoothly with no misfires or rough idle
• Verify proper oil pressure at idle and under load (minimum 1.5 bar at idle, 3.5 bar at 3000 rpm)
• After 50-100 miles of operation, recheck coolant level and inspect for any signs of leakage
• Monitor for any coolant consumption or white exhaust smoke indicating head gasket failure
• Perform compression test if any concerns about head gasket seal quality - all cylinders should be within 10% of each other

More procedures for this vehicle