Pistons - All

Complete replacement of all six pistons in the 3.0L V6 Twin Turbo engine, requiring engine removal, disassembly of cylinder heads, and crankshaft/connecting rod work.

Warnings

Tools required

Parts

• Piston set with rings and pins (6 pistons) × 1 — Use OEM specification
• Connecting rod bearing set × 1 — Use OEM specification
• Main bearing set (if replacement needed) × 1 — Use OEM specification
• Cylinder head gasket set (both banks) × 2 — Use OEM specification
• Valve cover gaskets and seals × 2 — Use OEM specification
• Oil pan gasket × 1 — Use OEM specification
• Timing chain/belt service kit × 1 — Use OEM specification
• Oil pump pickup tube O-ring × 1 — Use OEM specification
• Connecting rod bolts (TTY) × 12 — Use OEM specification
• Cylinder head bolts (TTY) × 1 — Use OEM specification
• Main bearing cap bolts (TTY) × 1 — Use OEM specification
• Oil drain plug crush washer × 1 — Use OEM specification
• Various engine seals and O-rings × 1 — Use OEM specification
• Coolant hoses as needed × 1 — Inspect and replace as necessary
• Turbocharger gaskets × 2 — Use OEM specification

Fluids

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

Preparation

1. Park vehicle on level surface and engage parking brake
2. Disconnect negative battery cable and wait 15 minutes for system discharge
3. Remove engine cover and all decorative trim
4. Drain engine oil completely and remove oil filter
5. Drain cooling system completely from radiator and block drain plugs
6. Remove front bumper cover, radiator, and cooling fans
7. Disconnect all electrical connectors, labeling each for reassembly
8. Disconnect fuel lines after relieving fuel system pressure
9. Remove intake manifold, throttle bodies, and turbochargers with all associated plumbing
10. Remove exhaust manifolds and downpipes
11. Disconnect transmission from engine bellhousing
12. Support engine with hoist and remove all engine mount bolts
13. Extract engine from vehicle and mount securely on engine stand
14. Clean exterior of engine thoroughly before disassembly
15. Document or photograph all component positions and orientations

Procedure

1. 1

   Remove valve covers and cylinder heads
   Remove valve covers from both banks. Remove all accessory drive components. Following manufacturer's sequence in reverse, remove cylinder head bolts (these are TTY and must be replaced). Carefully lift cylinder heads from block and place on clean padded surface. Inspect cylinder head mating surfaces for warpage and damage.
   Torque spec

   Cylinder Head Bolts65 Nm (48 lb-ft)
2. 2

   Remove timing components and oil pan
   Remove timing chain covers and mark timing chain positions. Remove timing chains, guides, and tensioners. Remove oil pan bolts and carefully separate oil pan from block. Remove oil pump pickup tube from oil pump. Inspect oil pump for wear and replace if necessary.
   Torque spec

   Oil Pan Bolts12 Nm (9 lb-ft)

   Oil Pump Pickup Tube12 Nm (9 lb-ft)

   Cover Bolts18 Nm (13 lb-ft)
3. 3

   Remove ridge from cylinder bores
   Use ridge reamer to carefully remove any ridge at the top of each cylinder bore. This prevents piston ring damage during removal. Rotate crankshaft to position each piston at bottom dead center before reaming. Clean all debris thoroughly from bores after reaming.
   ⚠Do not cut too deep when removing ridge - only remove the worn ridge area. Excessive material removal can damage the bore.
4. 4

   Mark and remove connecting rod caps
   Mark each connecting rod and cap with cylinder number and orientation using permanent marker or stamps. Remove connecting rod bolts (these are TTY and must be replaced). Carefully remove connecting rod caps and keep matched with their respective rods. Inspect rod and cap mating surfaces.
   ⚠Never mix connecting rod caps between rods. Each cap must remain with its original connecting rod.
   Torque spec

   Connecting Rod Bolts45 Nm (33 lb-ft)
5. 5

   Remove piston and connecting rod assemblies
   Push each piston and connecting rod assembly up and out through the top of the cylinder bore. Protect crankshaft journals by placing rubber hose or tubing over connecting rod bolts. Keep each piston matched with its connecting rod and cylinder number. Inspect crankshaft journals for scoring or damage.
6. 6

   Measure cylinder bores and inspect block
   Using bore gauge, measure each cylinder bore at multiple points (top, middle, bottom) in both parallel and perpendicular directions to crankshaft. Record all measurements. Check for taper, out-of-round, and scoring. Bores must be within 0.05mm tolerance for new piston installation. Inspect block deck surface for warpage using straightedge and feeler gauges.
   ⚠If cylinder bores are out of specification, the block must be honed or bored to next oversize before piston installation. Consult machine shop.
7. 7

   Disassemble pistons from connecting rods
   Using piston pin press or appropriate tool, carefully press out piston pins to separate pistons from connecting rods. Keep pins matched to their pistons if reusing. Remove all old piston rings using ring expander tool. Thoroughly clean pistons and connecting rods with solvent. Inspect connecting rod small end bushings for wear.
8. 8

   Clean and inspect all components
   Thoroughly clean engine block, crankshaft, connecting rods, and all mating surfaces with appropriate solvent. Remove all old gasket material from block deck surfaces and oil pan mating surface using plastic scrapers. Blow out all oil passages with compressed air. Inspect crankshaft journals with micrometer and verify within specification. Check connecting rods for straightness and twist.
   ⚠Ensure all oil passages are completely clear. Blocked passages will cause oil starvation and immediate engine failure.
   Torque spec

   Gasket Surface Bolts22 Nm (16 lb-ft)
9. 9

   Install piston rings on new pistons
   Using piston ring installer tool, carefully install rings on each new piston in correct order: oil control ring (expander and rails first), then second compression ring, then top compression ring. Verify ring end gaps are within specification using feeler gauge while ring is in cylinder bore. Orient ring gaps at 120-degree intervals around piston. Apply light coat of assembly lube to rings.
   ⚠Do not over-expand rings during installation as they can break. Ring end gaps must be checked and confirmed within specification.
10. 10

    Assemble pistons to connecting rods
    Install new pistons on connecting rods with correct orientation (directional arrow on piston crown faces front of engine). Using piston pin press, install piston pins through piston and connecting rod small end. Install piston pin retaining clips ensuring they are fully seated in piston grooves. Verify piston moves freely on rod without binding.
    ⚠️Piston orientation is critical. Directional arrow on piston crown must face timing chain end of engine. Incorrect orientation will cause valve-to-piston contact.
11. 11

    Check crankshaft bearing clearances
    Install main bearing shells (if replacing) in block and caps. Place Plastigage strip on each crankshaft main journal. Install main bearing caps with new TTY bolts and torque to 75 Nm following specified sequence, then apply required angle. Remove caps and measure Plastigage width to determine clearance. Clearance must be within 0.025-0.075mm specification. Repeat process for connecting rod bearings.
    ⚠️Do not rotate crankshaft with Plastigage installed. This will give false readings. If clearances are not within specification, do not proceed.
    Torque spec

    Main Bearing Cap Bolts75 Nm (55 lb-ft)
12. 12

    Install piston and connecting rod assemblies
    Lubricate cylinder bores, pistons, and rings with assembly lube. Install connecting rod bearing shells and lubricate with assembly lube. Protect crankshaft journals with rubber hose over rod bolts. Using piston ring compressor, compress rings and carefully tap each piston into its cylinder bore with wooden hammer handle. Guide connecting rod onto crankshaft journal. Verify piston orientation is correct.
    ⚠Ensure ring compressor is tight and all rings are fully compressed before pushing piston into bore. Partially compressed rings will break.
13. 13

    Install connecting rod caps and torque
    Install connecting rod caps in correct orientation matching marks made during disassembly. Install new TTY connecting rod bolts. Lubricate bolt threads and under bolt heads with engine oil. Torque each connecting rod bolt to 45 Nm, then apply additional angle as specified by manufacturer (typically 90 degrees). Verify crankshaft rotates freely after each rod cap installation.
    ⚠️New TTY bolts must be used. Angle torque specification is critical and must be followed precisely. Use angle gauge for accuracy.
    Torque spec

    Connecting Rod Bolts45 Nm (33 lb-ft)
14. 14

    Install oil pump and oil pan
    Install oil pump pickup tube with new O-ring and torque to 12 Nm. Install oil pump if removed. Clean oil pan and block mating surfaces thoroughly. Apply thin bead of RTV sealant to corners where timing cover meets block (if specified), then install new oil pan gasket. Install oil pan and torque bolts in spiral pattern from center outward to 12 Nm. Allow RTV to cure per manufacturer specification before adding oil.
    Torque spec

    Oil Pump Pickup Tube12 Nm (9 lb-ft)

    Oil Pan Bolts12 Nm (9 lb-ft)
15. 15

    Install timing components
    Install timing chains following manufacturer's timing marks precisely. Install chain guides and tensioners. Install timing chain covers with new gaskets, torquing cover bolts to 18 Nm. Rotate crankshaft two complete revolutions and verify all timing marks align correctly. Apply thread sealant and install crankshaft damper.
    ⚠️Timing must be absolutely correct. Even one tooth off will cause severe engine damage. Verify timing marks multiple times before proceeding.
    Torque spec

    Cover Bolts18 Nm (13 lb-ft)

    Gasket Bolts21 Nm (16 lb-ft)
16. 16

    Install cylinder heads
    Clean cylinder head and block mating surfaces thoroughly. Install new cylinder head gaskets with correct orientation. Carefully lower cylinder heads onto block, ensuring gaskets remain properly positioned. Install new TTY cylinder head bolts with light oil on threads. Torque bolts to 65 Nm following manufacturer's specified sequence, then apply required angle (typically 90 degrees plus additional 90 degrees). Install valve covers with new gaskets.
    ⚠️Cylinder head bolt sequence and angle torque procedure is critical. Use manufacturer's specific sequence diagram and follow multi-stage torque procedure exactly.
    Torque spec

    Cylinder Head Bolts65 Nm (48 lb-ft)

    Gasket Surface Bolts22 Nm (16 lb-ft)
17. 17

    Reinstall engine and connect all systems
    Install engine back into vehicle using hoist. Reconnect engine mounts and torque mounting bolts to 50 Nm. Reconnect transmission to engine. Install all turbochargers, exhaust components, intake manifold, and accessory systems. Reconnect all electrical connectors, fuel lines, and coolant hoses. Install radiator, cooling fans, and front bumper assembly. Install new oil filter and oil drain plug with new crush washer torqued to 35 Nm.
    Torque spec

    Mounting Bolts50 Nm (37 lb-ft)

    Oil Drain Plug35 Nm (26 lb-ft)

    Electrical Connector Bolts7 Nm (5 lb-ft)

Reassembly

1. Fill engine with 5.5 quarts of Selenia Racing 10W-60 oil
2. Fill cooling system with 10 quarts of Maserati OAT coolant and bleed air from system
3. Reconnect battery and verify all electrical connections are secure
4. Double-check that all bolts, hoses, and connectors are properly installed
5. Remove tools and any materials from engine compartment

Verification

• Perform initial engine start and listen for unusual noises. Stop immediately if any abnormal sounds occur
• Monitor oil pressure gauge - pressure should rise within 5 seconds of starting. If not, shut down immediately
• Check for oil, coolant, and fuel leaks while engine runs at idle
• Allow engine to reach operating temperature while monitoring coolant temperature
• Verify no check engine lights or fault codes are present
• Perform test drive and verify smooth engine operation under various loads
• Recheck oil and coolant levels after test drive and top off as necessary
• After 500 miles, recheck all accessible bolts and connections for proper torque
• Perform first oil change after 500-1000 miles of break-in period

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