Valve Springs - All

Complete replacement of all valve springs on the 3.0L V6 Twin Turbo engine, requiring removal of camshafts and valve train components from both cylinder banks.

Warnings

Tools required

Parts

• Valve springs (intake) × 12 — Use OEM specification
• Valve springs (exhaust) × 12 — Use OEM specification
• Valve spring retainers (intake) × 12 — Use OEM specification
• Valve spring retainers (exhaust) × 12 — Use OEM specification
• Valve stem seals × 24 — Use OEM specification
• Valve cover gaskets (left and right) × 2 — Use OEM specification
• Camshaft cap gaskets/seals × 1 — Use OEM specification
• Spark plug tube seals × 6 — Use OEM specification
• VVT solenoid O-rings × 4 — Use OEM specification
• Anti-seize compound × 1 — Copper-based high temp
• Engine oil × 1 — Selenia Racing 10W-60
• RTV silicone sealant (Maserati approved) × 1 — Use OEM specification

Fluids

• Selenia Racing 10W-60 — 5.5 qt

Preparation

1. Disconnect negative battery cable and wait 10 minutes for airbag system to discharge
2. Remove engine cover and intake air ducts
3. Drain engine oil completely and remove oil filter
4. Remove both turbocharger inlet pipes and intercooler connections as needed for access
5. Label and disconnect all electrical connectors, vacuum lines, and breather hoses from valve covers
6. Remove ignition coil packs from all six cylinders and store in order
7. Remove spark plugs from all cylinders and store in order to identify any cylinder-specific issues
8. Photograph camshaft timing marks and crankshaft position before any disassembly
9. Rotate engine to TDC on cylinder #1 and verify timing marks alignment
10. Support engine weight if removing any motor mounts for access
11. Create an organized workspace with labeled containers for bolts and small parts from left and right banks

Procedure

1. 1

   Remove valve covers from both banks
   Remove valve cover mounting bolts in reverse of tightening sequence (start from outside, work inward). Carefully lift valve covers away, noting any stuck areas from old RTV. Clean any oil from exposed camshaft area. Inspect valve cover gaskets and spark plug tube seals for damage.
   Torque spec

   Cover Bolts18 Nm (13 lb-ft)
2. 2

   Remove variable valve timing (VVT) solenoids and sensors
   Disconnect electrical connectors from VVT solenoids on all four camshaft positions (intake and exhaust, both banks). Remove sensor mounting bolts and electrical connector bolts. Carefully extract solenoids and note O-ring condition. Remove camshaft position sensors if they obstruct access.
   Torque spec

   Mounting Bolts50 Nm (37 lb-ft)

   Electrical Connector Bolts7 Nm (5 lb-ft)
3. 3

   Document and mark camshaft cap positions
   Each camshaft cap is marked with position numbers and must return to exact location. Photograph or draw diagram showing cap positions, orientation arrows, and bank identification. Use paint pen to mark caps and their corresponding journals if factory marks are unclear. Note intake versus exhaust camshaft identification.
   ⚠Mixing up camshaft cap positions will cause binding and potential camshaft failure. This is a critical step that cannot be skipped.
4. 4

   Remove camshaft bearing caps in sequence
   Loosen camshaft cap bolts gradually in multiple passes, working from the outer caps toward the center to prevent camshaft distortion. Remove bolts completely and lift caps away, keeping them organized by position. Note any bearing cap to journal fit tightness. Once caps are removed, carefully lift camshafts out of the head and place on clean surface. Inspect cam lobes for wear.
   Torque spec

   Camshaft Cap Bolts14 Nm (10 lb-ft)
5. 5

   Remove rocker arms and hydraulic lash adjusters
   If equipped with rocker arm assembly, remove rocker arm shaft bolts evenly and lift rocker arm assembly away. Otherwise, remove individual rocker arm bolts. Keep rocker arms in order by cylinder and intake/exhaust position. Remove hydraulic lash adjusters from their bores using magnetic tool. Store adjusters upright in clean oil to prevent air entry. Label each adjuster position.
   Torque spec

   Rocker Arm Shaft Bolts25 Nm (18 lb-ft)

   Rocker Arm Bolts30 Nm (22 lb-ft)
6. 6

   Compress and remove valve springs - Cylinder 1
   Install valve spring compressor tool on intake valve of cylinder 1. Apply shop air pressure (60-80 psi) to cylinder through spark plug hole to hold valve closed, or use alternative method to prevent valve drop. Carefully compress spring until keepers are accessible. Use magnetic tool to remove both valve keepers. Slowly release spring tension and remove compressor. Remove spring retainer, valve spring, and spring seat. Remove old valve stem seal with pliers. Repeat for exhaust valve. Place all parts in labeled container.
   ⚠️Ensure valve spring compressor is properly seated before applying force. Tool slippage can cause serious injury.
   ⚠Do not allow valve to drop into cylinder. Use compressed air or position piston near TDC to support valve from below.
7. 7

   Remove valve springs from remaining cylinders
   Rotate engine as needed to position each cylinder near TDC for valve support. Repeat valve spring removal process for cylinders 2 through 6 on first bank, then complete second bank. Maintain organization of all parts by cylinder number. Inspect each valve stem for scoring, each spring for cracks or uneven wear, and each retainer for damage. Measure spring free height and compare to service specifications if available.
   ℹ️Work systematically through one bank at a time to maintain organization and reduce risk of mixing components.
8. 8

   Clean valve stems and install new seals
   Clean each valve stem thoroughly with solvent and plastic scraper, removing any carbon buildup. Inspect stem for scoring or damage. Lightly oil new valve stem seals. Using appropriate seal installation tool or deep socket, carefully press new seals onto valve guides until fully seated. Do not hammer or damage seals during installation. Install one cylinder at a time before proceeding with springs.
   ⚠Damaged valve stem seals will cause excessive oil consumption. Ensure seals are properly seated and not torn during installation.
9. 9

   Install new valve springs and retainers
   Install spring seat on valve guide over new seal. Place new valve spring over guide (verify correct orientation if springs are directional - typically closer-wound coils toward head). Install spring retainer on top of spring. Use valve spring compressor to compress spring sufficiently to install keepers. Apply small amount of grease to keepers to hold in position. Carefully install both keepers in valve stem groove using magnetic tool. Slowly release spring compressor and verify keepers are fully seated. Tap valve stem lightly with plastic mallet to confirm keeper seating. Repeat for all 24 valves.
   ⚠Verify keepers are fully seated in stem groove before releasing spring compressor. Partially seated keepers will fail immediately upon engine start.
10. 10

    Reinstall hydraulic lash adjusters and rocker arms
    Clean lash adjuster bores in cylinder head. Install each hydraulic lash adjuster in its original position - these should not be mixed between cylinders. If rocker arm assembly is used, install complete assembly ensuring rocker arms align with valve stem tips and camshaft will contact rocker arm properly. If individual rocker arms, install each in original position. Verify rocker arms move freely and align with valve stems. Do not fully torque rocker arm bolts until camshafts are installed.
    ℹ️Some hydraulic lash adjusters may have bled down during removal. They will pump back up after engine start.
    Torque spec

    Rocker Arm Bolts30 Nm (22 lb-ft)

    Rocker Arm Shaft Bolts25 Nm (18 lb-ft)
11. 11

    Reinstall camshafts and verify timing alignment
    Lubricate camshaft journals and lobes with assembly lube or engine oil. Carefully lower camshafts into position, ensuring they are seated in journals. Rotate camshafts to align timing marks as photographed during disassembly. Use camshaft alignment tool to verify proper position. Install camshaft caps in exact original positions following marked orientation. Hand-tighten all cap bolts first.
    ⚠Camshaft timing marks must align exactly. Verify against service documentation before proceeding.
12. 12

    Torque camshaft caps and rocker components to specification
    Torque camshaft cap bolts in multiple passes starting from center caps and working outward. First pass to 7 Nm, second pass to 10 Nm, final pass to 14 Nm. Ensure bolts are tightened in correct sequence. Rotate engine by hand through two complete revolutions and verify no binding. Re-verify timing marks alignment. If rocker arm bolts were not previously torqued, ensure cam lobes are pointing away from rocker arms and torque to specification.
    Torque spec

    Camshaft Cap Bolts14 Nm (10 lb-ft)

    Rocker Arm Bolts30 Nm (22 lb-ft)

    Rocker Arm Shaft Bolts25 Nm (18 lb-ft)
13. 13

    Reinstall VVT solenoids and sensors
    Install new O-rings on VVT solenoids lubricated with clean engine oil. Install solenoids into camshaft positions and torque sensor mounting bolts to specification. Reconnect electrical connectors and torque electrical connector bolts. Reinstall camshaft position sensors with new O-rings if removed.
    Torque spec

    Mounting Bolts50 Nm (37 lb-ft)

    Electrical Connector Bolts7 Nm (5 lb-ft)
14. 14

    Prepare and install valve covers
    Clean all gasket surfaces on valve covers and cylinder head using plastic scraper and solvent. Remove all old RTV residue. Apply thin bead of Maserati-approved RTV sealant to corners where camshaft caps meet cylinder head (typically four corners per bank). Install new valve cover gaskets and new spark plug tube seals. Position valve covers carefully to avoid disturbing gaskets. Install cover bolts and tighten in sequence from center outward.
    ℹ️Allow RTV sealant to cure per manufacturer instructions before adding oil and starting engine, typically 30-60 minutes.
    Torque spec

    Cover Bolts18 Nm (13 lb-ft)
15. 15

    Install spark plugs and ignition components
    Inspect spark plug threads and apply anti-seize compound sparingly to threads (avoid electrode end). Install spark plugs hand-tight, then torque to specification being careful not to over-torque in aluminum heads. Reinstall ignition coil packs in original positions and reconnect electrical connectors. Reconnect all vacuum lines, breather hoses, and any remaining electrical connections.
    ⚠Over-torquing spark plugs in aluminum heads can strip threads requiring costly head repair. Use calibrated torque wrench.
    Torque spec

    Spark Plugs - Aluminum Head20 Nm (15 lb-ft)

Reassembly

1. Reinstall turbocharger inlet pipes, intercooler connections, and intake air ducts
2. Reinstall engine cover and any trim pieces removed for access
3. Install new oil filter and refill engine with 5.5 quarts of Selenia Racing 10W-60 oil
4. Reconnect battery negative cable
5. Before starting engine, turn ignition to ON position (without starting) to allow fuel system to pressurize and VVT solenoids to initialize
6. Verify no warning lights indicate timing or sensor issues before cranking engine

Verification

• Start engine and verify it runs smoothly without unusual valve train noise, ticking, or knocking
• Monitor for oil leaks around valve covers, particularly at RTV seal areas and gasket interfaces
• Allow engine to reach operating temperature and verify no check engine lights illuminate
• Listen for proper valve train operation - should be quiet with no clicking or tapping from lash adjusters
• Scan for diagnostic trouble codes using Maserati-compatible scan tool - verify no camshaft position correlation errors
• Check oil level after engine runs and adjust if necessary, as new valve stem seals and components may retain oil initially
• Perform test drive and verify smooth power delivery across RPM range with no hesitation or misfires
• Re-check valve cover bolts for proper torque after engine has cooled following first run cycle
• Monitor oil consumption over next 500 miles to verify new valve stem seals are sealing properly

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