Timing Chain Guide

Replace the timing chain guide(s) on the 3.0L V6 Twin Turbo engine, requiring removal of front timing cover, setting engine to TDC, and replacement of worn guide components with proper timing alignment.

Warnings

Tools required

Parts

• Timing chain guide(s) × 1 — Use OEM specification
• Timing cover gasket × 1 — Use OEM specification
• Valve cover gaskets × 2 — Use OEM specification
• Crankshaft front seal × 1 — Use OEM specification
• Timing chain tensioner (if worn) × 1 — Use OEM specification
• Engine oil and filter × 1 — Selenia Racing 10W-60
• Timing cover RTV silicone sealant × 1 — Maserati approved sealant
• Thread locking compound (medium strength) × 1 — Loctite 243 equivalent

Fluids

• Selenia Racing 10W-60 — 5.5 qt

Preparation

1. Ensure engine is completely cold before starting work
2. Disconnect negative battery cable and secure away from terminal
3. Raise vehicle on lift or jack stands and secure properly
4. Remove engine under-covers and belly pan to access crankshaft pulley
5. Drain engine oil completely and remove oil filter
6. Drain coolant from radiator and engine block if accessing lower timing components
7. Remove engine cover and air intake system for access to valve covers
8. Take photographs of all wiring, hose routing, and timing marks for reference
9. Support engine weight using engine support fixture from above or transmission jack from below
10. Label all electrical connectors and vacuum lines before disconnecting

Procedure

1. 1

   Remove valve covers and accessory components
   Remove both valve covers by loosening bolts in reverse of tightening sequence. Disconnect ignition coils and all electrical connectors. Remove any vacuum lines attached to valve covers. Remove accessory drive belt by releasing tensioner. Remove alternator and A/C compressor mounting bolts but leave hoses attached and support components aside.
   Torque spec

   Cover Bolts18 Nm (13 lb-ft)

   Electrical Connector Bolts7 Nm (5 lb-ft)

   Mounting Bolts50 Nm (37 lb-ft)
2. 2

   Remove crankshaft pulley
   Use crankshaft holding tool to prevent rotation. Remove the crankshaft pulley bolt using breaker bar (note: high torque). Remove harmonic balancer/crankshaft pulley from crankshaft snout. Inspect keyway for damage.
   ⚠Crankshaft pulley bolt is very tight (137 lb-ft). Use proper holding tool to prevent engine rotation and flywheel damage.
   Torque spec

   Crankshaft Pulley Bolt185 Nm (137 lb-ft)
3. 3

   Remove front timing cover
   Remove all timing cover bolts, noting locations of different length bolts. There are different size bolts (standard and 8mm) that must be tracked carefully. Carefully separate timing cover from engine block. Clean all old gasket material and RTV from mating surfaces on both block and cover using plastic scraper. Inspect cover for cracks or warping.
   ℹ️Keep track of bolt locations - 8mm bolts go in specific positions and different lengths are used in various locations.
   Torque spec

   Cover Bolts18 Nm (13 lb-ft)
4. 4

   Rotate engine to TDC and verify timing marks
   Rotate crankshaft clockwise using socket on crankshaft bolt location until cylinder 1 is at TDC compression stroke. Verify timing marks on camshaft sprockets align with marks on cylinder heads. Install TDC timing pin into block to lock crankshaft position. Install camshaft locking tools to secure both camshafts in correct position. Take detailed photographs of chain routing and all timing marks.
   ⚠️Absolutely critical that engine is at exact TDC with all timing marks aligned before proceeding. Verify multiple times.
5. 5

   Release timing chain tension
   Remove timing chain tensioner bolt and carefully extract tensioner. Note the tensioner ratchet position and mechanism condition. If tensioner shows wear or does not hold pressure, replace it. Keep tension on chain manually to prevent it from falling off sprockets during guide removal.
   ⚠Chain may shift position when tensioner is removed. Keep light manual pressure on chain to maintain position on sprockets.
   Torque spec

   Tensioner Bolt21 Nm (16 lb-ft)
6. 6

   Remove worn timing chain guide
   Remove timing chain guide bolts securing the worn guide(s). Note exact position and orientation of guide before removal. Inspect guide for wear patterns, cracks, or missing material. Remove guide carefully without disturbing chain position on sprockets. If guide bolts show wear or stretching, replace them.
   ℹ️Inspect removed guide for wear patterns which may indicate other timing system issues such as chain stretch or misalignment.
   Torque spec

   Guide Bolts26 Nm (19 lb-ft)
7. 7

   Inspect timing chain and sprockets
   With guide removed, thoroughly inspect timing chain for stretch, wear, or damaged links. Check all sprocket teeth for wear, chipping, or damage. Measure chain stretch if possible using dial indicator. Inspect all other guides, rails, and contact surfaces for wear. If chain shows more than specification stretch or any damage, replace the complete timing set (beyond scope of this repair).
   ⚠A worn guide often indicates chain stretch or other timing component wear. If chain or sprockets show significant wear, complete timing set replacement is recommended.
8. 8

   Install new timing chain guide
   Position new timing chain guide in exact location of old guide. Verify guide contacts chain properly and fits all mounting points. Apply medium-strength thread locking compound to guide bolts. Install and hand-tighten all guide bolts, then torque to specification in a cross-pattern. Verify guide is seated fully and chain runs smoothly over guide surface.
   ℹ️Ensure new guide material matches OEM specifications - aftermarket guides may not provide adequate durability in this high-performance engine.
   Torque spec

   Guide Bolts26 Nm (19 lb-ft)
9. 9

   Install timing chain tensioner
   If reusing tensioner, reset ratchet mechanism per manufacturer procedure. If installing new tensioner, verify it is in compressed/unlocked position for installation. Install tensioner into bore and secure with bolt to specification. Verify tensioner releases and applies proper pressure to chain. Remove camshaft locking tools and verify chain maintains position.
   Torque spec

   Tensioner Bolt21 Nm (16 lb-ft)
10. 10

    Verify timing alignment
    With tensioner installed, remove TDC pin and camshaft locking tools. Manually rotate crankshaft two complete revolutions clockwise. Reinstall TDC pin and verify it slides into position at TDC. Reinstall camshaft locking tools and verify they engage properly with camshafts still in correct position. Repeat verification twice more to confirm timing is correct.
    ⚠️If timing marks do not realign after two crankshaft rotations, DO NOT proceed. Disassemble and identify timing error before continuing.
11. 11

    Install new timing cover gasket and seal
    Install new crankshaft front seal into timing cover using seal driver. Ensure seal is flush and properly seated. Clean timing cover and block gasket surfaces again with solvent to remove any oil residue. Apply thin bead of Maserati-approved RTV silicone to timing cover gasket surfaces per service manual diagram. Install new gasket onto cover or block per design. Apply small amount of RTV to specified corners where cover meets block joints.
    ℹ️Use only Maserati-approved RTV sealant. Incorrect sealant can break down from oil contact and cause leaks.
    Torque spec

    Gasket Surface Bolts22 Nm (16 lb-ft)
12. 12

    Install timing cover
    Remove timing pin and camshaft locking tools for final time. Carefully position timing cover onto engine block, ensuring gasket remains in position and cover slides over crankshaft snout without damaging seal. Install all timing cover bolts finger-tight, keeping track of correct bolt lengths and positions. Tighten 8mm bolts first in specified sequence to proper torque, then tighten remaining cover bolts in sequence. Finally torque all gasket surface bolts to specification.
    ⚠Follow tightening sequence exactly to prevent cover warping and oil leaks. 8mm bolts are torqued differently than standard cover bolts.
    Torque spec

    Cover Bolts18 Nm (13 lb-ft)

    Gasket Surface Bolts22 Nm (16 lb-ft)
13. 13

    Install crankshaft pulley and accessories
    Clean crankshaft snout and inside of pulley. Install harmonic balancer/pulley onto crankshaft, aligning keyway. Install new crankshaft pulley bolt with thread locking compound. Use holding tool and torque bolt to specification (137 lb-ft). Reinstall alternator and A/C compressor to mounting bolts at specified torque. Install accessory drive belt per routing diagram.
    Torque spec

    Crankshaft Pulley Bolt185 Nm (137 lb-ft)

    Mounting Bolts50 Nm (37 lb-ft)
14. 14

    Install valve covers
    Install new valve cover gaskets onto both valve covers. Ensure all gasket seating grooves are clean and gaskets seat properly. Position valve covers onto cylinder heads. Install valve cover bolts and tighten in proper sequence from center outward to specified torque. Reconnect all ignition coils, electrical connectors, and vacuum lines. Torque all electrical connector bolts to specification.
    Torque spec

    Cover Bolts18 Nm (13 lb-ft)

    Electrical Connector Bolts7 Nm (5 lb-ft)
15. 15

    Refill fluids and final checks
    Install new oil filter and torque to specification. Refill engine with 5.5 quarts of Selenia Racing 10W-60 oil. Refill coolant system if drained. Reinstall engine under-covers and belly pan. Reconnect battery negative cable. Perform final visual inspection of all connections, bolts, and components. Check that no tools or parts remain in engine bay.

Reassembly

1. Double-check all timing cover bolts are torqued to specification in proper sequence
2. Verify all electrical connectors are fully seated and secured
3. Confirm accessory drive belt is properly routed and tensioned
4. Ensure no tools, rags, or parts remain in engine compartment
5. Verify all fluid levels are correct before starting engine

Verification

• With ignition off, manually rotate crankshaft one full revolution to verify no interference or binding
• Start engine and listen for any abnormal timing chain noise or rattles
• Allow engine to idle for 5 minutes, monitoring for oil leaks at timing cover and valve covers
• Check oil pressure is within normal range (should stabilize within 30 seconds)
• Rev engine slowly to 3000 RPM and verify smooth operation with no timing noise
• Perform test drive and monitor for any unusual engine sounds or vibrations
• After test drive, inspect timing cover and valve covers again for any signs of oil leakage
• Scan for any diagnostic trouble codes related to cam/crank correlation
• Recheck oil level after running engine and top off if necessary

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