This procedure covers the replacement of the timing chain guide on the 5.0L Coyote V8 engine, requiring removal of the front timing cover and timing components to access the worn guide.

Warnings

Tools required

Parts

• Timing chain guide (left or right as needed) × 1 — Motorcraft OEM
• Timing cover gasket × 1 — Use OEM specification
• Valve cover gaskets × 2 — Use OEM specification
• Crankshaft front seal × 1 — Use OEM specification
• RTV silicone sealant (Motorcraft TA-31) × 1 — Use OEM specification
• Engine oil × 1 — Motorcraft 0W-20 Full Synthetic
• Engine coolant × 1 — Motorcraft Orange Coolant

Fluids

• Motorcraft 0W-20 Full Synthetic — 7.5 qt
• Motorcraft Orange Coolant — 3 qt

Preparation

1. Ensure engine is completely cool
2. Disconnect negative battery cable and wait 15 minutes for airbag system discharge
3. Remove engine cover (plastic cover on top of engine)
4. Drain engine coolant into appropriate container
5. Drain engine oil into appropriate container
6. Remove serpentine belt
7. Remove radiator and upper radiator hose
8. Remove both valve covers and set aside with gaskets
9. Support engine from above using engine support fixture or attach hoist to engine lifting eyes
10. Remove engine mount on passenger side to allow engine movement if needed

Procedure

1. 1

   Remove Crankshaft Pulley and Harmonic Balancer
   Remove the crankshaft pulley bolt using a breaker bar while holding the crankshaft from rotating (use flywheel holding tool or have assistant hold with vehicle in gear and brakes applied). Remove the crankshaft pulley bolt. Use a harmonic balancer puller to remove the balancer from the crankshaft snout. Do not pry or hammer on the balancer as this will damage the crankshaft.
   Torque spec

   Crankshaft pulley bolt (M16, tighten then +90°)100 Nm (74 lb-ft)
2. 2

   Remove Front Timing Cover
   Remove all timing cover bolts. Note that there are different length bolts in different positions - mark or photograph their locations. There are standard bolts and 8mm bolts that require different torque specifications. Carefully separate the timing cover from the engine block. You may need to gently pry at designated pry points. Remove the old gasket material and RTV from both the cover and engine block mating surfaces using a gasket scraper. Be careful not to gouge aluminum surfaces.
3. 3

   Verify Timing Marks and Document Position
   Rotate the crankshaft to TDC (Top Dead Center) on cylinder #1. Verify that all timing marks on the camshaft sprockets and crankshaft sprocket align with their respective marks on the engine block and heads. Take multiple photos from different angles showing the timing chain routing, sprocket positions, and guide positions. Mark the chain-to-sprocket relationship with paint marker if needed. This documentation is critical for reassembly.
   ⚠Do NOT proceed if timing marks do not align properly. Incorrect initial timing indicates a problem that must be resolved first.
4. 4

   Remove Timing Chain Tensioners
   Compress the timing chain tensioners and insert a 2.5mm pin or drill bit into the tensioner body to lock them in the compressed position. Remove the tensioner mounting bolts and remove both left and right tensioners from the engine. Keep track of which tensioner came from which side as they may have different wear patterns.
5. 5

   Remove Camshaft Sprockets
   Install the camshaft holding tool on each camshaft to prevent rotation. Remove the camshaft sprocket bolts from all four camshafts (two per cylinder head). Remove the camshaft sprockets while keeping the timing chains supported. Do not allow the chains to fall into the engine.
   ⚠Support timing chains with wire or zip ties to prevent them from falling into the engine cavity.
6. 6

   Remove Timing Chains
   Remove both timing chains from the crankshaft sprocket and camshaft sprockets. Keep chains organized and labeled (left/right) if they will be reused. Inspect chains for wear, stretching, or damaged links. Replace if any wear is evident.
   ℹ️If chains show any wear, replace them while you have access. This prevents repeat disassembly.
7. 7

   Remove and Inspect Timing Chain Guides
   Remove the timing chain guide mounting bolts. There are multiple guides: left and right chain guides, and tensioner guides. Remove all guides and inspect each one carefully for wear grooves, cracks, or material loss. The guides should have smooth surfaces without deep grooves worn by the chain. Replace any guide showing wear, especially if wear grooves exceed 1mm depth.
   Torque spec

   Timing chain guide bolts12 Nm (106 lb-ft)
8. 8

   Install New Timing Chain Guide
   Install the new timing chain guide(s) in the proper position. Ensure the guide is fully seated against its mounting surface and properly oriented (compare with old guide and reference photos). Install guide bolts and tighten to specification. Verify the guide does not have excessive play or movement after installation.
   Torque spec

   Timing chain guide bolts12 Nm (106 lb-ft)
9. 9

   Reinstall Timing Chains and Sprockets
   Install the crankshaft sprocket if removed. Route the timing chains around the crankshaft sprocket and over the guides, following your reference photos exactly. Install camshaft sprockets onto the camshafts, ensuring timing marks align properly with TDC position. Use camshaft holding tool to prevent rotation while installing sprocket bolts. Verify all timing marks align correctly before tightening sprocket bolts to specification.
   ⚠️Double and triple-check timing alignment before proceeding. Incorrect timing will cause valve-to-piston contact and engine destruction.
10. 10

    Install Timing Chain Tensioners
    Install both timing chain tensioners with the locking pins still in place to keep them compressed. Install tensioner bolts and tighten to specification. Carefully remove the locking pins from both tensioners, allowing them to apply tension to the chains. Verify that the chains have proper tension and that there is no excessive slack.
11. 11

    Verify Timing and Rotate Engine
    Using a breaker bar on the crankshaft bolt, manually rotate the engine two complete revolutions clockwise (viewed from front). Recheck that all timing marks align at TDC on cylinder #1. If marks do not align, do not proceed - disassemble and identify the error. Verify smooth rotation with no binding or unusual resistance.
    ⚠️If engine binds during rotation or timing marks do not realign, STOP immediately. Valve-to-piston contact may occur.
12. 12

    Install Front Timing Cover
    Clean all mating surfaces thoroughly. Install new crankshaft front seal in timing cover if not already done. Apply a thin 2-3mm bead of RTV silicone (Motorcraft TA-31) to the engine block at the oil pan-to-block joint and cylinder head-to-block joints. Install new timing cover gasket. Position timing cover onto engine and install all bolts finger-tight. Tighten bolts in a cross-pattern sequence starting from the center and working outward. Use appropriate torque specifications for 8mm bolts versus standard bolts.
    ℹ️Allow RTV to cure for 30 minutes before adding fluids or starting engine.
13. 13

    Install Harmonic Balancer and Crankshaft Pulley
    Clean the crankshaft snout and inner bore of the harmonic balancer. Apply a light coat of clean engine oil to the crankshaft seal surface. Install the harmonic balancer onto the crankshaft, aligning the keyway. Install the crankshaft pulley bolt and tighten to specification. Use proper technique to prevent crankshaft rotation during tightening.
    Torque spec

    Crankshaft pulley bolt (M16, tighten then +90°)100 Nm (74 lb-ft)
14. 14

    Reinstall Valve Covers and Accessories
    Install new valve cover gaskets. Install valve covers and tighten bolts in the specified sequence from center outward to prevent gasket distortion. Reinstall engine mount, radiator, upper radiator hose, serpentine belt, and engine cover. Reconnect battery.

Reassembly

1. Fill engine with 7.5 quarts of Motorcraft 0W-20 full synthetic engine oil
2. Refill cooling system with Motorcraft Orange Coolant to proper level
3. Bleed cooling system by running engine to operating temperature with heater on high
4. Check for oil and coolant leaks around timing cover and valve covers
5. Verify proper serpentine belt tension and alignment

Verification

• Start engine and listen for unusual noises, timing chain rattle, or knocking
• Engine should idle smoothly without misfires or rough running
• Verify no oil or coolant leaks from timing cover or valve covers after engine reaches operating temperature
• Check engine oil level after running and top off if needed
• Test drive vehicle to verify normal performance and no check engine lights
• Recheck all fluid levels after test drive and inspect for leaks
• Monitor engine performance over the next several days for any abnormalities

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