This procedure covers the removal and replacement of all valve springs on the 2AR-FE 2.5L I4 engine, requiring camshaft removal and specialized valve spring compression tools.

Warnings

Tools required

Parts

• Valve springs (16 required) × 16 — Use OEM specification
• Valve spring seats/retainers (16 required) × 16 — Use OEM specification
• Valve stem seals (16 required) × 16 — Use OEM specification
• Valve cover gasket × 1 — Use OEM specification
• Camshaft cap seals × 2 — Use OEM specification
• Timing chain cover gasket × 1 — Use OEM specification
• Engine oil × 1 — Toyota Genuine 0W-20

Fluids

• Toyota Genuine 0W-20 — 5 qt

Preparation

1. Disconnect negative battery terminal and wait 90 seconds for airbag system discharge
2. Remove engine cover by pulling upward on four mounting points
3. Remove ignition coil covers and disconnect all four ignition coil connectors
4. Remove all four ignition coils and set aside in order
5. Drain engine oil completely and reinstall drain plug
6. Remove air intake assembly from throttle body to air filter housing
7. Disconnect PCV hoses from valve cover
8. Label and photograph all vacuum lines and electrical connections for reassembly reference

Procedure

1. 1

   Remove valve cover assembly
   Remove all valve cover bolts in reverse of tightening sequence (outside to inside pattern). Carefully lift valve cover away from cylinder head. If stuck, gently tap with rubber mallet - do not pry against sealing surface. Clean all gasket material from valve cover and cylinder head mating surfaces using plastic scraper.
   Torque spec

   Cover Bolts16 Nm (12 lb-ft)
2. 2

   Remove spark plugs
   Remove all four spark plugs and inspect for condition. This provides access holes to prevent valves from dropping. Store spark plugs in order for inspection reference.
   Torque spec

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

   Rotate engine to TDC cylinder #1
   Rotate crankshaft clockwise using 19mm socket on crankshaft bolt until timing marks on crankshaft and camshaft sprockets align with marks on timing chain cover and cylinder head. The VVT-i controller timing mark on intake camshaft should align with the painted link on timing chain. This is TDC compression stroke cylinder #1. Mark timing chain to both camshaft sprockets with paint pen for reassembly reference.
   ⚠Only rotate engine in clockwise direction (viewed from front). Counter-clockwise rotation can damage timing chain tensioner.
4. 4

   Remove timing chain cover (upper section)
   Remove bolts securing upper timing chain cover. The 2AR-FE has split timing cover design - only upper portion needs removal for camshaft access. Carefully separate cover from cylinder head, noting any dowel pin locations.
   Torque spec

   Cover Bolts16 Nm (12 lb-ft)
5. 5

   Secure timing chain and remove camshaft sprockets
   Using wire or zip ties, secure timing chain to prevent it from falling into lower timing cover. Hold each camshaft with wrench on hex section and remove camshaft sprocket bolts. Remove both intake and exhaust camshaft sprockets while keeping timing chain secured. Do not allow camshafts to rotate from TDC position.
   ⚠️If timing chain falls into lower cover, oil pan and timing cover removal will be required for retrieval.
6. 6

   Mark and remove camshaft caps
   Camshaft caps are numbered 1-5 on intake cam and 1-5 on exhaust cam with directional arrows. Use paint pen to mark each cap position and orientation. Loosen camshaft cap bolts in multiple passes working from outer caps toward center, 1/4 turn at a time in crisscross pattern. This prevents camshaft distortion. Remove all caps and store in exact order.
   ⚠Improper camshaft cap removal sequence can bend camshafts or break caps. Always loosen gradually from outside toward center.
   Torque spec

   Camshaft Cap Bolts14 Nm (10 lb-ft)
7. 7

   Remove camshafts
   Carefully lift both intake and exhaust camshafts straight up from cylinder head. Mark intake and exhaust clearly - they are not interchangeable. Place camshafts on clean padded surface with lobes facing up. Inspect camshaft journals and lobes for scoring or wear.
   ℹ️Keep camshafts separated and clearly marked. Intake camshaft has VVT-i controller; exhaust does not.
8. 8

   Remove rocker arms and lash adjusters
   Remove all 16 rocker arms and hydraulic lash adjusters. Each rocker arm sits on one lash adjuster. Use parts organizer to keep each rocker arm and lash adjuster matched to its original valve position (I1-I8 for intake, E1-E8 for exhaust). Inspect rocker arm roller surfaces and lash adjuster contact surfaces for wear or scoring.
   ⚠Lash adjusters contain oil and must remain upright. Do not lay on side or they will drain and cause valve noise on startup.
9. 9

   Compress and remove valve springs
   Install overhead cam valve spring compressor on first valve. Feed shop air hose with tapered rubber adapter into spark plug hole to pressurize cylinder - this prevents valve from dropping. Compress valve spring until keepers are accessible. Use magnetic tool to remove both valve keepers. Slowly release spring compressor and remove retainer, spring, and seat. Remove valve stem seal using pick or seal puller. Repeat for all 16 valves, keeping components organized by cylinder and valve position.
   ⚠️Maintain 80-100 PSI air pressure in cylinder while valve spring is removed. Loss of air pressure will allow valve to fall into cylinder.
   ⚠Valve keepers are tiny and easily lost. Work over clean drop cloth and use magnetic retrieval tool exclusively.
10. 10

    Inspect valves and seats
    With springs removed and air pressure maintaining valve position, visually inspect valve stems for scoring, bending, or excessive wear. Inspect visible portion of valve seats in combustion chamber for pitting or burning. Check valve guide clearance by gently attempting to rock valve stem - excessive movement indicates worn guides requiring cylinder head service.
    ℹ️If valve guides are worn or valves show damage, cylinder head should be removed for complete valve job. Installing new springs on damaged valves is not recommended.
11. 11

    Install new valve stem seals and springs
    Lubricate new valve stem seal with clean engine oil. Using appropriate driver or deep socket, carefully press new seal onto valve guide until seated. Install valve spring seat (shim), then new valve spring with tightly-wound coils toward cylinder head. Install retainer. Compress new spring with valve spring compressor while maintaining air pressure. Install both valve keepers in valve stem groove using magnetic tool. Slowly release compressor and verify keepers are fully seated with light tap on valve stem end. Repeat for all 16 valves.
    ⚠Valve stem seals must be installed square and fully seated. Cocked or partially seated seals will cause oil consumption.
12. 12

    Reinstall lash adjusters and rocker arms
    Install each hydraulic lash adjuster back into its original bore in cylinder head. Lash adjusters should slide in with light oil coating. Install each rocker arm over its corresponding valve stem and lash adjuster, ensuring rocker arm roller properly contacts valve stem and adjuster contact pad. Verify all 16 rocker arms move freely on their pivot points.
    ℹ️Lash adjusters that were stored upright can be reused immediately. If any were laid on side, they must be primed or allowed to sit upright overnight.
13. 13

    Install camshafts
    Coat all camshaft journals with clean engine oil. Install exhaust camshaft first with timing mark at approximately 12 o'clock position. Install intake camshaft with VVT-i controller, positioning timing mark at approximately 10 o'clock position. Ensure all rocker arms properly engage with camshaft lobes - no rocker arms should be trapped or misaligned.
    ⚠Camshafts must be positioned so no valve is at full lift. This prevents valve-to-piston contact and allows cap installation without excessive force.
14. 14

    Install camshaft caps and torque
    Apply thin bead of RTV sealant to semi-circular plug areas of cap #1 on both camshafts (front caps). Install all camshaft caps in their original positions with arrows pointing toward timing chain end. Install all bolts finger-tight. Torque camshaft cap bolts in multiple passes starting from center cap and working outward in sequence: first pass 5 Nm, second pass 10 Nm, final pass to specification. Verify camshafts rotate smoothly by hand after torquing.
    ⚠Incorrect torque sequence or single-pass torquing can bind camshafts or break caps. Always work from center outward in multiple passes.
    Torque spec

    Camshaft Cap Bolts14 Nm (10 lb-ft)
15. 15

    Install camshaft sprockets and verify timing
    Align camshaft sprocket bolt holes with camshaft dowel pins. Install both sprockets with timing chain positioned on sprockets matching original paint marks. Verify all timing marks align: crankshaft at TDC, exhaust cam mark at 12 o'clock aligned with mark on cylinder head, intake cam VVT-i controller mark aligned with painted chain link. Install and torque camshaft sprocket bolts while holding camshafts with wrench on hex section. Rotate engine two complete revolutions clockwise and recheck all timing marks align perfectly.
    ⚠️Incorrect valve timing will cause immediate engine damage on startup. Triple-check all timing marks before proceeding.
    Torque spec

    Mounting Bolts47 Nm (35 lb-ft)
16. 16

    Reinstall timing chain cover and valve cover
    Install new gasket or apply RTV sealant to upper timing chain cover mating surface. Install cover and torque bolts to specification. Install new valve cover gasket into valve cover groove. Apply small dab of RTV at front corners where camshaft caps meet cylinder head. Install valve cover and torque bolts in sequence from center outward.
    Torque spec

    Cover Bolts16 Nm (12 lb-ft)
17. 17

    Install spark plugs and ignition components
    Apply anti-seize compound sparingly to spark plug threads. Install all four spark plugs and torque to specification. Install ignition coils in their original positions, reconnect electrical connectors, and install coil covers. Reconnect PCV hoses to valve cover.
    Torque spec

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

Reassembly

1. Reinstall air intake assembly and secure all clamps
2. Fill engine with 5.0 quarts Toyota Genuine 0W-20 engine oil
3. Reconnect negative battery terminal
4. Reinstall engine cover

Verification

• Before starting engine, remove all spark plugs and crank engine for 10 seconds to build oil pressure and verify no valve-to-piston contact
• Reinstall spark plugs and start engine - expect some valve noise for first 30 seconds until lash adjusters pump up with oil
• Allow engine to idle and listen for any abnormal valve train noise, ticking, or rattling
• Check for oil leaks around valve cover and timing chain cover
• Verify smooth idle with no misfires - use scan tool to check for timing-related codes
• Test drive vehicle and verify normal power delivery and no check engine light
• Recheck valve cover and timing cover for leaks after engine reaches operating temperature
• Monitor oil consumption over next 500 miles to verify valve stem seals are sealing properly

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