This procedure covers removal and replacement of all valve springs on the 2014-2019 Toyota Corolla 1.8L I4 engine, requiring camshaft removal and precise reassembly with critical torque specifications.

Warnings

Tools required

Parts

• Valve springs (set of 16) × 1 — Use OEM specification
• Valve spring retainers (set of 16) × 1 — Use OEM specification
• Valve stem seals (set of 16) × 1 — Use OEM specification
• Valve cover gasket × 1 — Use OEM specification
• Valve cover grommets/seals × 1 — Use OEM specification
• Camshaft seal(s) × 1 — Use OEM specification
• Timing chain cover gasket × 1 — Use OEM specification if disturbed
• Engine oil × 1 — Toyota Genuine 0W-20

Fluids

• Toyota Genuine 0W-20 — 4.5 qt

Preparation

1. Ensure engine is completely cold before starting work
2. Disconnect negative battery cable and secure away from battery post
3. Remove engine cover (if equipped) by pulling upward on retaining clips
4. Drain engine oil and remove oil filter
5. Remove air intake assembly and air filter box to access valve cover
6. Disconnect all electrical connectors from valve cover area including ignition coils
7. Label and photograph all hose connections and electrical routing for reassembly reference
8. Clean work area thoroughly and prepare organized storage for small parts with labels

Procedure

1. 1

   Remove valve cover and accessories
   Remove ignition coils by disconnecting electrical connectors and removing mounting bolts. Remove PCV hoses and any breather hoses connected to valve cover. Remove valve cover bolts in reverse of tightening sequence (work from outside inward). Carefully lift valve cover off, tapping gently with rubber mallet if stuck. Remove and discard old gasket and grommets.
2. 2

   Rotate engine to TDC on cylinder #1
   Rotate crankshaft clockwise using 19mm socket on crankshaft pulley bolt until timing marks on camshaft sprockets align with marks on timing chain cover. Cylinder #1 should be at top dead center (TDC) on compression stroke. Verify both intake and exhaust cam lobes on cylinder #1 are pointing upward (valves closed). Mark timing chain to sprocket positions with paint pen.
3. 3

   Remove timing chain tensioner and guides
   Remove timing chain tensioner by removing mounting bolts and carefully extracting tensioner assembly. Remove timing chain guide(s) as necessary to access camshaft sprocket bolts. Keep all components organized and labeled for reassembly in exact original positions.
4. 4

   Secure and remove camshaft sprockets
   Using camshaft holding tool, secure each camshaft to prevent rotation. Remove camshaft sprocket bolts. Carefully slide sprockets off camshafts while maintaining timing chain position. Wire or zip-tie timing chain to prevent it from falling into timing cover. Do not allow chain to slip off crankshaft sprocket.
   ⚠Support timing chain to prevent it from dropping into engine. If chain falls, complete timing cover removal will be required.
5. 5

   Mark and remove camshaft bearing caps
   Using paint pen or permanent marker, mark each camshaft bearing cap with its position number and orientation arrow pointing toward front of engine. Caps are NOT interchangeable. Loosen camshaft cap bolts in reverse sequence (outward from center) in multiple passes, gradually and evenly (1/4 turn at a time). Remove caps and store in order. Carefully lift camshafts straight up and out, keeping intake and exhaust camshafts identified.
   ⚠️Camshaft bearing caps must be loosened gradually in sequence. Rapid removal can warp caps or damage camshaft journals.
6. 6

   Remove rocker arms and lash adjusters
   Lift out each rocker arm and hydraulic lash adjuster, keeping them in exact order (use numbered container or lay out on clean surface in cylinder order). Mark intake vs exhaust components clearly. These components must be reinstalled in their original positions to maintain proper wear patterns.
7. 7

   Compress and remove valve springs - Cylinder 1
   Starting with cylinder #1, install valve spring compressor tool on first valve spring. Compress spring until retainer keeper (collet) locks are accessible. Using magnetic pick-up tool or small screwdriver, carefully remove both keeper halves. Slowly release spring compressor tension and remove retainer, spring, and valve stem seal. Inspect valve stem for damage. Repeat for all valves on cylinder #1. Keep components organized by cylinder and valve position.
   ⚠️Ensure valve spring compressor is properly seated before compressing. Tool slippage can cause violent spring release and serious injury.
   ⚠Do not drop keeper locks into engine. Use magnetic tray and work carefully over clean rags.
8. 8

   Remove remaining valve springs for cylinders 2-4
   Repeat valve spring removal process for cylinders 2, 3, and 4. Compress each spring, remove keeper locks, release tension, and remove retainer, spring, and seal. Maintain organization of all components by cylinder number and valve position (intake vs exhaust). Inspect each valve spring for cracks, wear, or deformation. Inspect valve stem seals for hardening or damage.
9. 9

   Install new valve springs - Cylinder 1
   Clean valve stem thoroughly with lint-free cloth. Install new valve stem seal on valve guide using appropriate seal installation tool (do not hammer directly on seal). Lightly oil valve stem. Place new valve spring over valve stem (verify correct orientation if spring has closer-wound coils on one end - closer coils go toward cylinder head). Place retainer on spring. Compress spring with compressor tool until retainer is below keeper groove. Install both keeper halves into valve stem groove. Slowly release compressor while ensuring keepers remain seated. Tap valve stem tip gently with plastic tool to verify keepers are locked. Repeat for all valves on cylinder #1.
   ⚠Verify keeper locks are fully seated before releasing spring tension. Partially seated keepers will fail immediately upon engine start.
10. 10

    Install valve springs for cylinders 2-4
    Repeat new valve spring installation process for cylinders 2, 3, and 4. Install seal, spring, retainer, and keepers for each valve. Verify each keeper set is properly locked by tapping valve stem and observing keeper engagement. Double-check all 16 valves have springs installed before proceeding.
11. 11

    Reinstall rocker arms and lash adjusters
    Install each hydraulic lash adjuster back into its original bore in the cylinder head. Install each rocker arm onto its original position over the corresponding lash adjuster and valve stem. Ensure rocker arms move freely and contact valve stem tips properly. Apply light coat of clean engine oil to all components during installation.
12. 12

    Install camshafts
    Apply clean engine oil to all camshaft journals and lobes. Carefully place intake and exhaust camshafts onto cylinder head in original positions, ensuring cam lobes are positioned correctly (reference photos taken during disassembly or service manual cam position diagrams). Verify camshafts rotate smoothly by hand before installing caps.
13. 13

    Install camshaft bearing caps
    Install camshaft bearing caps in exact original positions following marked orientation. Hand-start all camshaft cap bolts. Tighten camshaft cap bolts in sequence from center outward in multiple passes: first pass to 5 Nm, second pass to 10 Nm, final pass to 14 Nm specification. Verify camshafts rotate smoothly after torquing.
    ⚠Tighten camshaft caps gradually in sequence. Uneven tightening can damage bearing surfaces or bind camshafts.
    Torque spec

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

    Reinstall camshaft sprockets and timing components
    Verify timing marks are still aligned (or realign if disturbed). Install camshaft sprockets onto camshafts, aligning timing chain marks made during disassembly. Install and hand-tighten sprocket bolts. Using camshaft holding tool, torque sprocket bolts to specification per service manual (typically 40-50 Nm, verify in manual). Reinstall timing chain guides and tensioner to specifications.
15. 15

    Verify timing and install valve cover
    Manually rotate crankshaft two complete revolutions clockwise and verify all timing marks realign at TDC cylinder #1. Camshafts should rotate smoothly without binding. Install new valve cover gasket and grommets onto valve cover. Place valve cover onto cylinder head and hand-start all bolts. Tighten valve cover bolts in sequence from center outward to specification. Reinstall ignition coils with anti-seize on threads and torque to specification. Reconnect all electrical connectors and hoses.
    Torque spec

    Cover Bolts15 Nm (11 lb-ft)

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

Reassembly

1. Reinstall air intake assembly and air filter box
2. Install new oil filter and refill engine with 4.5 quarts of Toyota Genuine 0W-20 engine oil
3. Reinstall engine cover if equipped
4. Reconnect negative battery cable
5. Prime engine oil system by cranking engine for 5-10 seconds without starting (disconnect fuel pump relay or injector connectors)

Verification

• Start engine and listen carefully for any unusual valve train noise, ticking, or knocking. Engine should run smoothly.
• Monitor for oil leaks around valve cover gasket and camshaft seals during initial 5 minutes of operation
• Allow engine to reach operating temperature and verify no check engine lights or fault codes present
• Check engine oil level after initial run and top off if necessary
• Perform test drive and verify normal engine performance, smooth acceleration, and no abnormal noises
• Re-check valve cover bolt torque after engine cools completely (torque can settle after first heat cycle)
• Monitor oil consumption and valve train noise over next 100 miles to ensure proper valve spring and seal function

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