This procedure covers the replacement of the Variable Valve Timing (VVT) actuator on the intake camshaft of a 2015 Kia Forte 1.8L I4 engine, which controls valve timing for optimal performance and fuel economy.

Warnings

Tools required

Parts

• VVT actuator (intake camshaft) × 1 — Use OEM Kia/Hyundai specification
• Valve cover gasket × 1 — Use OEM specification
• Valve cover spark plug tube seals × 4 — Use OEM specification
• Timing cover gasket × 1 — Use OEM specification
• Engine oil and filter × 1 — Use OEM specification
• Crankshaft front seal × 1 — Optional - inspect during procedure

Fluids

• Kia Genuine 5W-20 — 4.5 qt

Preparation

1. Park vehicle on level surface and engage parking brake
2. Disconnect negative battery cable and wait 3 minutes for airbag system to discharge
3. Remove engine cover by pulling upward on front edge
4. Drain engine oil completely and remove oil filter
5. Support engine from below using floor jack with wood block on oil pan, or install engine support fixture from above
6. Remove right front wheel and inner fender liner for access to crankshaft pulley
7. Remove drive belt by rotating tensioner counterclockwise
8. Remove air intake duct and air filter housing for workspace

Procedure

1. 1

   Remove valve cover
   Disconnect ignition coil connectors and remove all four ignition coils. Label and disconnect any breather hoses or PCV connections from valve cover. Remove valve cover bolts in reverse sequence (outside to inside pattern). Carefully lift valve cover away, tapping gently with rubber mallet if stuck. Inspect gasket and spark plug tube seals.
   Torque spec

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

   Position crankshaft to TDC cylinder #1
   Rotate crankshaft clockwise using 19mm socket on crankshaft pulley bolt until timing mark on crankshaft sprocket aligns with mark on timing chain guide. Verify intake and exhaust camshaft sprocket timing marks align with cylinder head surface (marks should face each other). This is TDC compression stroke for cylinder #1. Mark timing chain to sprockets with paint pen for reference.
3. 3

   Remove crankshaft pulley and timing cover
   Hold crankshaft pulley with holding tool or jam breaker bar against frame. Remove crankshaft pulley bolt (may require impact wrench). Remove pulley from crankshaft. Remove timing cover bolts noting different lengths and positions. Carefully pry timing cover away from engine block. Clean all gasket material from mating surfaces.
   ⚠Crankshaft pulley bolt is very tight and may require impact wrench. Do not allow crankshaft to rotate during removal.
   Torque spec

   Crankshaft Pulley Bolt180 Nm (133 lb-ft)

   Cover Bolts15 Nm (11 lb-ft)
4. 4

   Release timing chain tension
   Locate timing chain tensioner on right side of engine. Remove tensioner mounting bolts. Slowly allow tensioner to extend while controlling pressure. Remove tensioner assembly. Remove timing chain guide bolts if necessary for access. Note timing chain routing around guides and sprockets.
   ⚠Tensioner is spring-loaded. Control removal to prevent sudden release.
   Torque spec

   Timing Chain Tensioner Bolt25 Nm (18 lb-ft)
5. 5

   Remove VVT actuator and camshaft sprocket
   Hold intake camshaft steady using wrench on hex section of camshaft (located between lobes). Remove VVT actuator center bolt while holding camshaft. Note that actuator may also serve as camshaft sprocket. Carefully slide VVT actuator off camshaft, keeping timing chain supported. Do not allow timing chain to fall into engine. Inspect actuator for internal damage, excessive play, or debris.
   ⚠Do not rotate camshaft once actuator is removed. Support timing chain to prevent it from falling into engine.
   Torque spec

   Cam Phaser Bolt65 Nm (48 lb-ft)
6. 6

   Inspect and clean components
   Inspect camshaft nose for wear or damage. Check camshaft oil passages are clear using compressed air. Inspect timing chain for excessive wear, stretching, or damaged links. Verify timing chain guides are not cracked or excessively worn. Clean camshaft mating surface and oil passages thoroughly. Inspect VVT oil control solenoid and screen for debris.
7. 7

   Install new VVT actuator
   Verify new VVT actuator matches old unit exactly. Align timing chain onto new actuator sprocket ensuring chain tension is on tight side. Rotate actuator to align mounting holes with camshaft while maintaining timing marks. Install actuator onto camshaft, ensuring dowel pin engages properly. Apply medium-strength threadlocker to actuator bolt threads. Install and hand-tighten bolt.
   ⚠Verify timing marks on chain and sprockets align exactly before tightening. Double-check crankshaft has not rotated from TDC position.
8. 8

   Torque VVT actuator bolt
   Hold intake camshaft stationary using wrench on hex section. Torque VVT actuator bolt to specification. After torquing, verify all timing marks still align correctly. Verify camshaft can rotate freely without binding. Confirm timing chain has proper tension on drive side.
   ⚠Holding camshaft stationary is critical - do not allow rotation during bolt tightening.
   Torque spec

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

   Reinstall timing chain tensioner
   Compress tensioner plunger and install locking pin or clip to hold compressed. Install tensioner to engine block with mounting bolts torqued to specification. Verify tensioner is properly seated. Remove locking pin/clip to apply tension to chain. Confirm chain has proper tension by attempting to move chain side-to-side - should have minimal slack.
   Torque spec

   Timing Chain Tensioner Bolt25 Nm (18 lb-ft)
10. 10

    Verify timing and install timing cover
    Rotate crankshaft clockwise two complete revolutions by hand using socket on crankshaft. Verify all timing marks realign at TDC cylinder #1. If marks do not align, remove actuator and repeat timing procedure. Once verified, install new timing cover gasket. Install timing cover and torque bolts in sequence (start at center, work outward). Install crankshaft pulley and torque bolt to specification.
    ⚠️Engine MUST rotate freely by hand. If resistance is felt, stop immediately - timing may be incorrect causing valve-to-piston interference.
    Torque spec

    Cover Bolts15 Nm (11 lb-ft)

    Crankshaft Pulley Bolt180 Nm (133 lb-ft)
11. 11

    Reinstall valve cover
    Install new spark plug tube seals into valve cover. Install new valve cover gasket ensuring proper seating in groove. Place valve cover onto cylinder head, ensuring gasket remains properly positioned. Install valve cover bolts and torque in sequence from center outward. Reinstall ignition coils and connect electrical connectors. Reconnect all breather hoses.
    Torque spec

    Cover Bolts15 Nm (11 lb-ft)

Reassembly

1. Reinstall drive belt by rotating tensioner and routing belt over all pulleys
2. Reinstall inner fender liner and right front wheel, torque lug nuts to specification
3. Reinstall air filter housing and intake duct
4. Install new oil filter and refill engine with 4.5 quarts of Kia Genuine 5W-20 oil
5. Reinstall engine cover
6. Reconnect negative battery cable

Verification

• Start engine and verify no unusual noises from timing chain area - should run smoothly without rattling
• Check for oil leaks at valve cover, timing cover, and VVT actuator area
• Verify engine idles smoothly without rough running or misfires
• Allow engine to reach operating temperature and confirm VVT system operates correctly (engine should idle smoothly and respond normally to throttle)
• Use scan tool to verify no VVT-related diagnostic trouble codes are present
• Check engine oil level after running and top off if necessary
• Test drive vehicle to confirm normal acceleration, idle quality, and fuel economy performance

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