This procedure covers the removal and replacement of a single hydraulic lifter on the 3.5L EcoBoost V6 engine, requiring cylinder head disassembly to access the lifter bore.

Warnings

Tools required

Parts

• Hydraulic roller lifter × 1 — Use OEM Ford specification
• Valve cover gasket (bank specific) × 1 — Use OEM specification
• Camshaft cap bolts (if reuse not recommended) × 4 — Use OEM specification
• Engine assembly lubricant × 1 — Motorcraft XL-1 or equivalent
• RTV silicone sealant × 1 — Motorcraft TA-357 or equivalent

Fluids

• Motorcraft 0W-20 Full Synthetic — 1 qt

Preparation

1. Ensure engine is completely cold (at least 4 hours after last operation)
2. Disconnect negative battery cable and wait 10 minutes for airbag system capacitor discharge
3. Remove engine cover by pulling upward on front edge to release clips
4. Relieve fuel system pressure: Remove fuel pump fuse, start engine and let it stall, crank for 5 seconds to ensure complete depressurization
5. Drain approximately 2 quarts of engine oil to prevent spillage during valve cover removal
6. Identify which bank (driver or passenger side) contains the failed lifter - this determines which cylinder head to access
7. Take photos of all electrical connections, vacuum lines, and component positions before removal
8. Mark all ignition coil positions with tape to ensure correct reinstallation

Procedure

1. 1

   Remove intake and ignition components
   Disconnect electrical connectors from ignition coils on affected bank. Remove coil mounting bolts and pull coils straight up from spark plug wells. Remove intake manifold upper plenum by disconnecting vacuum lines, PCV hoses, and electrical connectors. Remove intake manifold bolts in reverse of tightening sequence (outside to inside pattern) and lift manifold away. Set aside on clean surface with gasket surfaces facing up.
   Torque spec

   Intake Manifold Bolts25 Nm (18 lb-ft)

   Electrical Connector Bolts8 Nm (6 lb-ft)
2. 2

   Remove valve cover
   Disconnect all electrical connectors attached to valve cover including camshaft position sensor. Remove PCV hose and breather tube. Remove valve cover bolts in reverse sequence starting from outer bolts working inward. Carefully break seal with plastic pry tool if stuck - do not pry against gasket surfaces. Lift valve cover straight up and away. Inspect gasket surfaces for damage.
   Torque spec

   Cover Bolts19 Nm (14 lb-ft)
3. 3

   Verify camshaft timing marks
   Rotate engine to TDC on cylinder 1 using crankshaft pulley bolt (turn clockwise only when viewed from front). Verify timing marks on camshaft sprockets align with marks on timing chain guide or head surface. Take clear photos of timing mark positions. This is CRITICAL - you must return to exactly this position. Install camshaft holding tools on both camshafts to prevent rotation.
   ⚠️If timing marks do not align properly at TDC cylinder 1, DO NOT proceed. The engine timing may already be incorrect and requires professional diagnosis.
4. 4

   Remove rocker arm assembly over affected lifter
   Identify which rocker arm operates on the affected lifter. Using proper sequence (consult factory manual for specific bank and location), loosen rocker arm shaft bolts evenly in 2-3 passes to prevent distortion. For individual rocker arms, loosen rocker arm bolt while ensuring cam lobe is pointing away from rocker (base circle position). Remove rocker arm or shaft assembly and set on clean surface in exact order removed. Note orientation carefully.
   ⚠Rocker arm bolts must be loosened evenly and gradually. Uneven loosening can bend rocker shafts or damage components.
   Torque spec

   Rocker Arm Bolts30 Nm (22 lb-ft)

   Rocker Arm Shaft Bolts25 Nm (18 lb-ft)
5. 5

   Remove camshaft cap if necessary
   If lifter access requires camshaft cap removal (depends on specific lifter location), mark cap position and orientation with permanent marker. Loosen camshaft cap bolts in reverse sequence evenly in 3-4 passes - never loosen all at once. Remove cap and set aside with bolts in correct positions. Do NOT allow camshaft to rotate or move upward.
   ⚠️Camshaft is under valve spring pressure. Rapid removal of cap bolts can cause camshaft to jump upward causing injury or component damage.
6. 6

   Extract failed lifter
   Using magnetic lifter removal tool, carefully extract the failed lifter from its bore. Lifter should slide out with moderate resistance. If stuck, do NOT use excessive force - apply light penetrating oil around lifter and wait 15 minutes. Inspect removed lifter for scoring, flat spots on roller, or collapsed piston. Measure lifter bore diameter with inside micrometer if available - should be within 0.0005 inch of specification.
   ⚠Never pry against lifter bore walls. Damage to bore will require cylinder head replacement.
   ℹ️If lifter is severely stuck, cylinder head may require removal for professional extraction to prevent bore damage.
7. 7

   Clean and inspect lifter bore
   Thoroughly clean lifter bore with brake cleaner and lint-free cloth. Inspect bore walls for scoring, scratches, or damage - bore must be smooth with no visible defects. Check oil feed holes in bottom of bore are clear and unobstructed. Wipe bore completely dry and immediately coat with clean engine assembly lubricant to prevent rust. Inspect camshaft lobe corresponding to this lifter for wear, pitting, or flat spots.
   ⚠Any scoring in lifter bore or damage to cam lobe requires cylinder head replacement or camshaft replacement. Installing new lifter on damaged surfaces will cause immediate repeat failure.
8. 8

   Prepare and install new lifter
   Remove new lifter from packaging and inspect for shipping damage. Coat entire lifter body generously with engine assembly lubricant (Motorcraft XL-1 or equivalent). Submerge lifter in clean engine oil and use pushrod to work lifter plunger up and down 10-15 times to prime internal mechanism and purge air. Install lifter into bore with roller facing correct direction (match orientation of removed lifter). Lifter should slide in smoothly with light thumb pressure.
   ℹ️New lifter must be primed with oil before installation. Un-primed lifters can cause valve train noise for extended period or fail prematurely.
9. 9

   Reinstall camshaft cap if removed
   If camshaft cap was removed, verify camshaft timing mark is still aligned. Clean cap and head mating surfaces with brake cleaner. Install cap in exact original position per orientation marks. Install bolts finger tight, then torque in proper sequence evenly in 3 stages: 33%, 66%, then 100% of final specification. Rotate engine two complete revolutions and recheck timing marks alignment.
   ⚠️Verify camshaft timing marks before and after cap installation. Incorrect timing will cause valve-to-piston contact when engine starts.
10. 10

    Reinstall rocker arm assembly
    Ensure cam lobe is on base circle (pointing away from rocker arm position) before installation. Apply engine assembly lubricant to rocker arm contact surfaces and valve stem tips. Install rocker arm or shaft in exact original position and orientation. Tighten bolts evenly in proper sequence to specification. For individual rockers, ensure cam is on base circle during tightening. Manually rotate engine two complete revolutions and verify smooth operation with no binding.
    ⚠Tightening rocker arm with cam lobe at peak can bend pushrod, damage rocker, or break valve spring.
    Torque spec

    Rocker Arm Bolts30 Nm (22 lb-ft)

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

    Perform valve lash verification
    Using dial indicator on valve spring retainer, check valve lift on the newly serviced cylinder. Rotate engine through complete cycle and verify valve opens and closes smoothly with lift matching specification (approximately 10-11mm for this engine). Compare to adjacent cylinder if possible. Any deviation indicates improper assembly.
    ⚠Incorrect valve operation indicates assembly error. Do not start engine until verified correct.
12. 12

    Clean and install valve cover
    Remove all old gasket material from valve cover and cylinder head using plastic scraper - do not gouge aluminum surfaces. Clean mating surfaces with brake cleaner until completely oil-free. Install new valve cover gasket - do not use additional sealant unless specified. Apply small bead of RTV sealant only at front corners where timing cover meets cylinder head per factory specification. Install valve cover and hand-tighten all bolts. Torque bolts in proper sequence from center outward.
    ℹ️Over-torquing valve cover bolts will distort cover and cause oil leaks. Use proper torque sequence and specification.
    Torque spec

    Cover Bolts19 Nm (14 lb-ft)
13. 13

    Reinstall intake and ignition components
    Clean intake manifold gasket surfaces thoroughly. Install new intake gaskets (do not reuse old gaskets). Position intake manifold and install bolts finger tight. Torque intake manifold bolts in proper sequence from center outward. Reconnect all vacuum lines, PCV hoses, and electrical connectors per photos taken during disassembly. Install ignition coils in correct positions with new boots if worn. Apply dielectric grease to spark plug boots.
    Torque spec

    Intake Manifold Bolts25 Nm (18 lb-ft)
14. 14

    Refill fluids and final checks
    Refill engine oil to proper level - verify on dipstick in cold condition. Reinstall fuel pump fuse. Reconnect battery negative cable. Before starting, perform final visual inspection of all connections, bolts, and hoses. Verify no tools or rags left in engine bay. Check that all electrical connectors are fully seated with locking tabs engaged.
    ⚠First start after lifter replacement requires careful monitoring. Be prepared to shut down immediately if abnormal noises occur.

Reassembly

1. All components must be reinstalled in exact reverse order of removal
2. New gaskets are required for valve cover and intake manifold - do not reuse old gaskets
3. All torque specifications must be followed precisely using calibrated torque wrench
4. Camshaft timing marks must be verified before and after reassembly
5. Apply engine assembly lubricant to all moving parts during installation
6. RTV sealant requires 15-30 minute setup time before starting engine if used

Verification

• Start engine and listen carefully for first 30 seconds - lifter tick should be minimal or absent after 10-15 seconds of oil circulation
• Allow engine to idle for 5 minutes and monitor for unusual noises, vibrations, or check engine light
• Check for oil leaks around valve cover gasket and intake manifold after engine reaches operating temperature
• Perform test drive under light load and verify smooth operation with no valve train noise
• Recheck engine oil level after test drive - top off if necessary
• Monitor oil consumption over next 500 miles - excessive consumption may indicate other lifter or valve guide issues
• Use scan tool to verify no diagnostic trouble codes stored in ECM
• If lifter noise persists after 15 minutes of operation, shut down immediately and re-inspect installation

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