This procedure replaces the Variable Valve Timing (VVT) actuator on the intake camshaft of the 2014-2019 Toyota Corolla 1.8L engine, requiring timing cover removal and proper timing chain alignment.

Warnings

Tools required

Parts

• VVT actuator (intake camshaft) × 1 — Use OEM specification
• Timing cover gasket × 1 — Use OEM specification
• Valve cover gasket × 1 — Use OEM specification
• Valve cover grommets and spark plug tube seals × 1 — Use OEM specification
• Crankshaft pulley bolt (if TTY) × 1 — Use OEM specification
• Engine oil × 1 — 0W-20

Fluids

• Toyota Genuine 0W-20 — 4.5 qt

Preparation

1. Ensure engine is completely cold
2. Disconnect negative battery terminal and wait 90 seconds for airbag system discharge
3. Raise vehicle and secure on jack stands
4. Remove engine under cover(s)
5. Drain engine oil completely into appropriate container
6. Remove right front wheel and inner fender liner for access to crankshaft pulley
7. Remove air intake assembly and ducting
8. Disconnect throttle body connector and any vacuum lines interfering with valve cover access
9. Label and disconnect ignition coil connectors

Procedure

1. 1

   Remove valve cover
   Remove the four ignition coils by removing their mounting bolts and pulling straight up. Remove all valve cover bolts in reverse of tightening sequence (work from outside toward center). Carefully lift valve cover off, breaking the seal with a plastic pry tool if necessary. Remove and discard the old gasket and grommets.
   Torque spec

   Cover Bolts15 Nm (11 lb-ft)
2. 2

   Remove accessory drive belt and crankshaft pulley
   Rotate the tensioner clockwise with a 14mm wrench to release tension and remove the accessory drive belt. Install crankshaft holding tool or have assistant hold brake pedal with transmission in gear. Remove the crankshaft pulley bolt (requires significant force, often 133 lb-ft plus). Remove the crankshaft pulley. Note: this bolt may be torque-to-yield; inspect for stretching and replace if necessary.
   ⚠Crankshaft bolt is extremely tight. Use proper holding method to prevent engine rotation.
   Torque spec

   Crankshaft Pulley Bolt180 Nm (133 lb-ft)
3. 3

   Mark timing positions
   Rotate the crankshaft clockwise using a socket on the crankshaft bolt until cylinder #1 is at TDC compression stroke (both camshaft lobes for cylinder #1 pointing upward/outward). Using white paint marker, mark the relationship between the timing chain and both camshaft sprockets. Also mark the timing chain position relative to the crankshaft sprocket. Take photos for reference. Mark the front timing cover position relative to the cylinder head for proper realignment.
   ⚠️These timing marks are critical. Verify TDC position before marking. Misalignment will cause engine damage.
4. 4

   Remove timing chain cover
   Disconnect the VVT solenoid electrical connector. Remove the VVT solenoid valve bolt and remove the solenoid. Remove all timing cover bolts including the smaller cover bolts and the larger 8mm bolts. Note bolt locations as they are different lengths. Carefully separate the timing cover from the engine block and cylinder head. Use a razor blade to carefully cut through any RTV sealing the cover. Remove and discard the old gasket.
   Torque spec

   VVT Solenoid Bolt10 Nm (7 lb-ft)

   Cover Bolts15 Nm (11 lb-ft)
5. 5

   Verify timing and secure chain
   Verify all timing marks are still aligned. The timing chain tensioner is automatic and cannot be easily locked. Use a stiff wire or specialized tool to tie the timing chain to prevent it from falling into the engine when the VVT actuator is removed. Thread wire through chain links and secure to a bolt hole or engine component above. Ensure chain cannot slip on the crankshaft sprocket.
   ⚠️Timing chain must be securely supported. If chain falls or skips teeth, complete engine disassembly may be required.
6. 6

   Remove VVT actuator
   Hold the camshaft stationary using a wrench on the camshaft hex (located between lobes) or with a camshaft holding tool. Remove the VVT actuator bolt (cam phaser bolt). Carefully slide the VVT actuator forward off the camshaft, supporting the timing chain. Oil will drain from the actuator. Keep the actuator and timing chain together until fully removed, then carefully separate while keeping chain supported with wire.
   ⚠Camshaft must be held stationary or cam journals may be damaged.
   Torque spec

   Cam Phaser Bolt65 Nm (48 lb-ft)
7. 7

   Inspect and prepare new VVT actuator
   Inspect the camshaft snout for wear or damage. Check timing chain for excessive wear, stretched links, or damaged rollers. Clean the camshaft mounting surface thoroughly. Verify the new VVT actuator matches the old unit. Prime the new VVT actuator by filling its oil passages with fresh engine oil. Verify the actuator rotates smoothly through its range by hand.
   ℹ️If timing chain shows wear, consider replacement while engine is disassembled.
8. 8

   Install new VVT actuator
   Align the timing chain on the new VVT actuator sprocket using your timing marks as reference. Carefully slide the actuator onto the camshaft, ensuring the dowel pin on the camshaft engages the hole in the actuator. Verify all timing marks still align correctly with chain properly seated on all sprockets. Apply medium-strength threadlocker to the cam phaser bolt threads. Hold the camshaft stationary with a wrench and install the bolt, torquing to specification.
   ⚠️Double-check all timing marks before final tightening. Incorrect timing will destroy the engine.
   Torque spec

   Cam Phaser Bolt65 Nm (48 lb-ft)
9. 9

   Remove chain support and verify timing
   Carefully remove the wire or tool supporting the timing chain. Manually rotate the crankshaft two complete revolutions clockwise (720 degrees). Verify that all timing marks realign correctly at TDC. If marks do not align, DO NOT proceed. Remove actuator and repeat installation process.
   ⚠️If timing marks do not realign after two crankshaft rotations, timing is incorrect. Do not start engine.
10. 10

    Prepare and install timing cover
    Clean all old gasket material and RTV from both the timing cover and engine mating surfaces using a razor blade scraper. Clean surfaces with brake cleaner and allow to dry. Install new timing cover gasket. Apply a continuous 2-3mm bead of RTV silicone to the cylinder head and block mating surfaces where no gasket is present (typically corners and oil pan junction). Install timing cover within 3 minutes of RTV application. Install all timing cover bolts finger-tight, then torque in sequence from center outward.
    ⚠RTV silicone begins to cure immediately. Work quickly and do not disturb cover after placement.
    Torque spec

    Cover Bolts15 Nm (11 lb-ft)
11. 11

    Install VVT solenoid and crankshaft pulley
    Install a new O-ring on the VVT solenoid valve if provided. Install the solenoid into the timing cover and torque the bolt to specification. Reconnect the electrical connector. Clean the crankshaft nose and pulley bore. Install the crankshaft pulley and new bolt (if TTY). Torque the crankshaft pulley bolt to specification while holding crankshaft from rotating.
    Torque spec

    VVT Solenoid Bolt10 Nm (7 lb-ft)

    Crankshaft Pulley Bolt180 Nm (133 lb-ft)
12. 12

    Install valve cover
    Install new valve cover gasket, grommets, and spark plug tube seals. Ensure all seals are properly seated. Place valve cover onto cylinder head. Install all valve cover bolts finger-tight. Torque bolts in sequence (center outward, alternating sides) to specification. Do not overtighten. Reinstall ignition coils and torque their bolts to specification. Reconnect all electrical connectors.
    Torque spec

    Cover Bolts15 Nm (11 lb-ft)
13. 13

    Reinstall accessory belt and complete reassembly
    Route the accessory drive belt around all pulleys per the routing diagram (typically on radiator support). Rotate tensioner clockwise and slip belt onto tensioner pulley. Release tensioner slowly. Reinstall inner fender liner and wheel. Torque wheel lug nuts to 80 lb-ft. Reinstall air intake assembly. Reinstall engine under covers. Fill engine with correct quantity and grade of engine oil. Reconnect negative battery terminal.
    ℹ️Do not start engine yet. RTV requires minimum 2 hours cure time.

Reassembly

1. Allow minimum 2 hours for timing cover RTV to cure before starting engine
2. Verify all electrical connectors are reconnected
3. Verify all bolts and fasteners are installed and properly torqued
4. Check engine oil level on dipstick after filling

Verification

• After RTV cure time, start engine and verify no oil leaks from valve cover or timing cover
• Listen for abnormal timing chain noise or rattling (indicates timing problem or chain issues)
• Allow engine to reach operating temperature and verify VVT system operation by monitoring for smooth idle and no Check Engine Light
• Scan for diagnostic trouble codes related to VVT system (P0010, P0011, P0012, P0016, P0017)
• Test drive vehicle and verify normal acceleration and engine performance
• Recheck for oil leaks after test drive
• Verify engine oil level after test drive and top off if necessary

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