Valve Springs - All

This procedure involves replacing all valve springs on the 5.0L Coyote V8 engine, requiring removal of both camshafts and use of a valve spring compressor tool.

Warnings

Tools required

Parts

• Valve springs (set of 32) × 1 — Use OEM specification
• Valve stem seals (set of 32) × 1 — Use OEM specification
• Valve cover gaskets (left and right) × 2 — Use OEM specification
• Camshaft cap bolts × 32 — Use OEM specification
• Spark plugs (set of 8) × 1 — Motorcraft SP-515 or equivalent
• Engine oil and filter × 1 — Use OEM specification
• Anti-seize compound × 1 — Use OEM specification
• RTV silicone gasket maker × 1 — Motorcraft TA-31 or equivalent

Fluids

• Motorcraft 5W-20 Synthetic Blend — 7.5 qt

Preparation

1. Disconnect negative battery cable and wait 10 minutes for airbag system to discharge
2. Remove engine cover by pulling upward on front and rear tabs
3. Drain engine oil completely and remove oil filter
4. Remove air intake system including air filter housing and intake tube
5. Disconnect ignition coil electrical connectors and remove all 8 coil-on-plug assemblies
6. Label and disconnect all electrical connectors from valve covers including CMP sensors and VCT solenoids
7. Disconnect PCV hoses and any vacuum lines attached to valve covers
8. Remove accessory drive belt
9. Support engine from below with jack and wood block if necessary for access
10. Organize workspace with labeled containers for camshaft caps and bolts to maintain position tracking

Procedure

1. 1

   Remove valve covers
   Remove valve cover bolts in reverse of tightening sequence (outside to inside pattern). Carefully lift valve covers off cylinder heads. If covers are stuck, gently tap with rubber mallet - do not pry against sealing surfaces. Remove and discard valve cover gaskets.
   Torque spec

   Cover Bolts20 Nm (15 lb-ft)
2. 2

   Remove spark plugs
   Using spark plug socket, remove all 8 spark plugs from cylinder heads. Inspect plug condition and note any abnormalities. Keep plugs organized by cylinder number for reference. This provides access to combustion chambers and prevents debris from entering.
   Torque spec

   Spark Plugs - Aluminum Head20 Nm (15 lb-ft)
3. 3

   Rotate engine to TDC cylinder 1
   Rotate crankshaft clockwise using harmonic balancer bolt until cylinder 1 is at Top Dead Center (TDC) on compression stroke. Verify both intake and exhaust valves are closed on cylinder 1. Mark harmonic balancer and front cover with alignment marks for reference. This position reduces valve spring tension and provides safe starting point.
   ℹ️Confirm both cam lobes for cylinder 1 are pointing away from lifters before proceeding. This indicates TDC compression stroke.
4. 4

   Remove Variable Cam Timing (VCT) components
   Remove VCT solenoid bolts and solenoids from front of each cylinder head. Remove the single bolt securing each VCT actuator to the camshaft. Note that actuators are keyed to camshafts. Use timing chain wedge tool to secure timing chain position before removing actuators. Mark chain-to-actuator relationship with paint pen.
   ⚠Support timing chain with wire or timing chain wedge to prevent it from falling into timing cover. Do not allow chain to slip on crankshaft sprocket.
   Torque spec

   Sensor Bolts14 Nm (10 lb-ft)
5. 5

   Remove camshaft bearing caps
   Starting from outer caps and working inward, loosen camshaft cap bolts in multiple passes (1/4 turn at a time) to gradually release valve spring pressure on camshafts. Each cylinder head has caps numbered 1-4 on intake side and 1-4 on exhaust side. Label each cap with cylinder bank (left/right), position number, and orientation arrow. Keep caps in exact order with their original bolts. Once loose, remove all caps and set camshafts aside on clean surface.
   ⚠️Loosening caps too quickly can cause camshaft to suddenly release, potentially causing injury or damaging components. Use gradual multi-pass loosening sequence.
   ⚠Caps are machined as matched sets to their head. Never swap caps between positions or cylinder banks.
   Torque spec

   Camshaft Cap Bolts14 Nm (10 lb-ft)
6. 6

   Remove rocker arms
   Lift rocker arms straight up off hydraulic lash adjusters (HLAs). Organize rocker arms in order by cylinder and valve position if reusing. Inspect rocker arm roller bearings and contact surfaces for wear. If HLAs are loose, remove and store upright to prevent oil drain-down. Note valve positions: each cylinder has 2 intake and 2 exhaust valves.
   ℹ️If reusing rocker arms, keep them organized by exact original position. This maintains established wear patterns.
7. 7

   Compress valve springs and remove keepers - Bank 1
   Starting with right (passenger side) cylinder head, use overhead cam valve spring compressor to compress first valve spring. Carefully compress spring just enough to access keepers. Use magnetic pickup tool to remove both valve keepers (collets). Slowly release spring compressor and remove spring retainer, valve spring, and spring seat. Remove old valve stem seal using pliers or seal removal tool. Repeat for all 16 valves on this head. Keep springs organized if measuring or inspecting.
   ⚠️Valve springs are under 100+ pounds of tension. Ensure compressor tool is properly seated and secure before releasing keepers. Losing control of compressed spring can cause serious injury.
   ⚠Keepers are small and easily lost. Work over clean rag or magnetic tray. If keeper falls into cylinder, it must be retrieved before continuing.
8. 8

   Compress valve springs and remove keepers - Bank 2
   Repeat valve spring removal process for left (driver side) cylinder head. Use valve spring compressor to compress each spring, remove keepers with magnetic tool, release spring pressure, and remove retainer, spring, and spring seat. Remove old valve stem seals. Inspect each valve stem for scoring or damage. Remove all 16 valve springs from this head.
   ⚠️Maintain same safety precautions as Bank 1. Ensure valve spring compressor is properly engaged before each compression.
9. 9

   Install new valve stem seals - Bank 1
   Clean valve stem tips and inspect for damage. Install new valve stem seals on right cylinder head using appropriate seal installation tool or deep socket that contacts only outer edge of seal. Drive seal down until it seats on valve guide. Use light oil on seal lip. Install seal protector sleeve over valve stem tip if provided with seal kit to prevent damage during installation. Repeat for all 16 valves.
   ⚠Do not damage seal lip on valve keeper grooves. Use seal protector sleeve or tape over keeper grooves when installing seals.
10. 10

    Install new valve springs - Bank 1
    For each valve on right cylinder head, install spring seat (shim), new valve spring (verify correct orientation - tighter wound coils typically face cylinder head), and spring retainer. Using valve spring compressor, compress new spring and carefully install both keepers into valve stem grooves. Ensure keepers are fully seated in grooves on both sides. Slowly release compressor and verify keepers remain properly seated. Gently tap valve stem tip with plastic mallet to ensure keeper seating. Repeat for all 16 valves.
    ⚠Verify valve spring orientation matches original installation. Some springs are directional with different pitch on each end.
    ℹ️After releasing spring compressor, tug lightly on spring retainer to confirm keepers are locked in place.
11. 11

    Install new valve stem seals and springs - Bank 2
    Repeat seal and spring installation process for left cylinder head. Install new valve stem seals using proper tool, ensuring seals seat fully on guides. Install spring seats, new valve springs in correct orientation, and retainers. Compress each spring, install keepers, release carefully, and verify keeper seating. Complete all 16 valves on this head.
    ℹ️Maintain consistent installation technique for all valves to ensure uniform valve train geometry.
12. 12

    Reinstall rocker arms and hydraulic lash adjusters
    If HLAs were removed, reinstall them in their original positions after verifying they're still primed with oil (should have minimal compression). Install rocker arms over valve stem tips and HLA sockets. Ensure roller portion of rocker arm is centered on valve stem tip. Verify all 32 rocker arms are properly seated before installing camshafts.
    ℹ️HLAs must be kept upright to retain oil prime. Depressed HLAs indicate air entry and may cause noise on startup.
13. 13

    Install camshafts and bearing caps
    Lubricate camshaft journals and lobes with clean engine oil. Install intake and exhaust camshafts into their original positions on each cylinder head, verifying cam position sensor reluctor rings face front. Ensure camshafts are positioned with lobes for cylinder 1 pointing away from lifters (TDC position). Install camshaft bearing caps in exact original positions with directional arrows pointing toward front of engine. Install NEW camshaft cap bolts (old bolts must not be reused). Tighten cap bolts gradually in multiple passes starting from center caps and working outward, following numbered sequence stamped on caps. Torque in at least 3 passes to final specification.
    ⚠Camshaft caps must be installed in correct positions and orientation. Misalignment will cause immediate bearing damage.
    ⚠Tighten in multiple passes from center outward to evenly load camshaft journals. Uneven tightening can distort caps.
    Torque spec

    Camshaft Cap Bolts14 Nm (10 lb-ft)
14. 14

    Reinstall VCT actuators and timing components
    Verify timing chain is still properly positioned on crankshaft sprocket. Align VCT actuators to camshafts using locating key slots. Align timing marks made during disassembly (or verify per factory timing marks if replacing components). Install VCT actuator bolts and torque per specification. Install VCT solenoids to cylinder heads with new O-rings lubricated with clean engine oil. Install sensor bolts and torque to specification. Remove timing chain wedge tool.
    ⚠Verify camshaft timing alignment before final VCT actuator tightening. Incorrect timing will cause poor performance and potential engine damage.
    Torque spec

    Sensor Bolts14 Nm (10 lb-ft)
15. 15

    Install spark plugs and valve covers
    Clean cylinder head mating surfaces thoroughly with plastic scraper - remove all old gasket material and oil residue. Apply light coat of anti-seize to spark plug threads (avoiding electrodes). Install spark plugs finger-tight, then torque to specification using proper sequence (avoid cross-threading in aluminum heads). Install new valve cover gaskets - apply small dab of RTV at front corners where timing cover meets cylinder head. Position valve covers and install bolts. Torque valve cover bolts in proper sequence from center outward.
    ⚠Aluminum cylinder heads are soft. Cross-threading spark plugs will require costly head repair. Install carefully by hand first.
    Torque spec

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

    Cover Bolts20 Nm (15 lb-ft)
16. 16

    Reinstall remaining components and refill fluids
    Reconnect all electrical connectors to VCT solenoids, cam position sensors, and valve cover components. Reinstall ignition coils and connect electrical connectors. Reconnect PCV hoses and vacuum lines. Install new oil filter and refill engine with 7.5 quarts of Motorcraft 5W-20 synthetic blend oil. Reinstall air intake system and engine cover. Reconnect battery negative cable.
    ℹ️Double-check all electrical connections are fully seated and locked. Verify no tools or rags remain in engine bay.

Reassembly

1. Verify all fasteners have been torqued to specification using proper sequence where applicable
2. Confirm no tools or parts remain in engine compartment
3. Check that all electrical connectors are fully engaged with locking tabs seated
4. Verify oil level is at FULL mark on dipstick after filling

Verification

• Before starting engine, turn key to RUN position (not START) several times to allow fuel system to prime and oil pressure to build
• Start engine and verify oil pressure light extinguishes within 2-3 seconds
• Listen for abnormal valve train noise during first 30 seconds - some ticking may occur until HLAs pump up with oil
• Allow engine to reach operating temperature while monitoring for oil leaks at valve covers
• Verify no Check Engine Light illumination and scan for diagnostic codes related to cam timing or VCT system
• Perform test drive and verify normal engine performance, smooth idle, and proper power delivery
• Recheck oil level after test drive and top off if necessary
• Inspect valve cover gaskets for leaks after engine cools - retorque valve cover bolts if seepage observed

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