Timing Chain

Replace the timing chain, guides, tensioner, and related components on the 2015 Kia Forte 1.8L I4 engine to restore proper valve timing and prevent catastrophic engine damage.

Warnings

Tools required

Parts

• Timing chain kit (includes chain, guides, tensioner) × 1 — Use OEM Kia/Hyundai kit
• Timing cover gasket × 1 — Use OEM specification
• Valve cover gasket × 1 — Use OEM specification
• Crankshaft front seal × 1 — Use OEM specification
• Oil pan gasket (if disturbed) × 1 — Use OEM specification
• Engine oil and filter × 1 — 5W-20 spec, OEM filter recommended
• Oil drain plug crush washer × 1 — Use OEM specification
• VVT solenoid O-rings × 2 — Use OEM specification
• Coolant (if drained) × 1 — Hyundai/Kia Long Life Green

Fluids

• Kia Genuine 5W-20 — 4.5 qt
• Hyundai/Kia Long Life Coolant (Green) — 7.5 qt

Preparation

1. Ensure engine is completely cold before beginning work
2. Disconnect negative battery cable and secure away from terminal
3. Raise vehicle and secure on jack stands rated for the vehicle weight
4. Remove engine under cover and splash shields
5. Drain engine oil completely and remove oil filter
6. Drain coolant into appropriate container if radiator hoses must be removed
7. Remove air intake assembly and air filter housing
8. Remove accessory drive belts
9. Label and disconnect all electrical connectors that will interfere with access
10. Take photos of engine bay for reference during reassembly
11. Have factory service manual available for timing mark diagrams and sequences

Procedure

1. 1

   Remove valve cover and upper engine components
   Disconnect PCV hoses, breather hoses, and ignition coil connectors. Remove ignition coils and spark plugs. Remove valve cover bolts in reverse sequence and carefully lift valve cover. Inspect gasket surface for damage. Remove engine wiring harness brackets as needed for access.
2. 2

   Support engine and remove right side motor mount
   Install engine support fixture across engine bay or use floor jack with wood block under oil pan to support engine weight. Remove right side engine mount bracket and through-bolt. This provides access to timing cover area. Ensure engine is stable before proceeding.
   ⚠Engine must be properly supported before removing mounts. Verify stability by gently pushing on engine.
3. 3

   Remove crankshaft pulley and accessory brackets
   Remove crankshaft pulley center bolt using holding tool to prevent engine rotation. The bolt torque is very high (180 Nm) and may require impact gun or long breaker bar. Remove harmonic balancer using puller if necessary. Remove any remaining accessory brackets, power steering pump (support aside without disconnecting hoses), and alternator if needed for timing cover access.
   ⚠️Crankshaft pulley bolt may be torque-to-yield. Consult service manual to determine if replacement is required.
4. 4

   Remove timing cover
   Remove all timing cover bolts noting their different lengths and locations (6mm, 8mm, and 10mm bolts have different torque specs). Carefully separate timing cover from engine block using plastic pry tools - do not damage sealing surfaces. Remove old gasket material and RTV completely using plastic scraper. Clean all mating surfaces with brake cleaner and inspect for damage.
   Torque spec

   Timing Cover Bolts12 Nm (9 lb-ft)
5. 5

   Verify and mark timing positions
   Rotate engine to TDC cylinder #1 compression stroke using crankshaft bolt. Verify timing marks: crankshaft sprocket mark aligned with mark on engine block, camshaft sprocket marks aligned with cylinder head marks. Take multiple photos from different angles. Mark chain-to-sprocket relationship with paint pen on multiple links as backup reference. This is critical for correct reassembly.
   ⚠️Verify timing marks match factory service manual diagrams exactly. Incorrect timing will destroy engine.
6. 6

   Remove timing chain tensioner and guides
   Remove timing chain tensioner bolt and carefully remove tensioner assembly (note: tensioner may be spring-loaded). Remove timing chain guides and tensioner arm by removing their mounting bolts. Inspect oil pump drive chain and tensioner if accessible - replace if worn. Keep all components organized for comparison with new parts.
   Torque spec

   Timing Chain Tensioner25 Nm (18 lb-ft)

   Timing Chain Guide Bolts12 Nm (9 lb-ft)
7. 7

   Remove camshaft and crankshaft sprockets with chain
   Remove VVT solenoid bolts if present. Remove camshaft sprocket bolts while holding camshafts with wrench on hex section. For cam phaser equipped engines, note orientation and apply threadlocker upon reinstallation. Remove timing chain idler sprocket bolt if present. Slide timing chain off sprockets and remove as assembly. Remove crankshaft sprocket if necessary. Inspect all sprocket teeth for wear or damage.
   Torque spec

   Camshaft Sprocket Bolts80 Nm (59 lb-ft)
8. 8

   Inspect components and prepare for reassembly
   Thoroughly inspect camshaft bearing surfaces, cam lobes, and journals for scoring or excessive wear. Check crankshaft sprocket area for damage. Verify new timing chain kit includes all guides, tensioner, and hardware. Compare old and new parts to ensure correct kit. Clean all oil passages and timing area with brake cleaner. Replace crankshaft front seal at this time - press in carefully to avoid damage.
   ℹ️This is the ideal time to inspect camshaft condition. If excessive wear is found, consider complete cylinder head service.
9. 9

   Install crankshaft sprocket and timing chain guides
   Install crankshaft sprocket ensuring any alignment marks or keyways are properly seated. Install new timing chain guides and tensioner arm, torquing bolts to specification. Install timing chain idler sprocket if equipped. Verify all guide mounting surfaces are clean and bolts thread smoothly.
   Torque spec

   Timing Chain Guide Bolts12 Nm (9 lb-ft)
10. 10

    Install timing chain and camshaft sprockets
    Confirm crankshaft is still at TDC position. Route new timing chain around crankshaft sprocket, up around guides, and prepare camshaft sprockets. Install camshaft sprockets with chain while aligning timing marks per service manual (typically colored links align with marks on sprockets). Hold camshafts with wrench on hex section and install sprocket bolts finger-tight. For cam phaser bolts, apply threadlocker as specified. Verify all timing marks align correctly before final tightening.
    ⚠️Triple-check all timing marks before torquing sprocket bolts. Rotate engine manually two complete revolutions and recheck marks.
    Torque spec

    Camshaft Sprocket Bolts80 Nm (59 lb-ft)
11. 11

    Install and release timing chain tensioner
    Prepare new timing chain tensioner by compressing plunger and installing retaining pin or clip per manufacturer instructions. Install tensioner to engine and torque bolt to specification. Carefully remove retaining pin to apply tension to chain. Verify chain has proper tension and does not have excessive slack. Rotate engine manually two complete revolutions clockwise (viewed from front) and recheck all timing marks - they must realign perfectly.
    ⚠️After releasing tensioner, verify timing marks still align. If marks are off, timing chain is incorrectly installed.
    Torque spec

    Timing Chain Tensioner25 Nm (18 lb-ft)
12. 12

    Install timing cover with new gasket
    Clean timing cover and inspect for cracks or damage. Install new timing cover gasket and apply thin bead of RTV silicone to areas specified in service manual (typically oil pan junction). Position timing cover carefully ensuring alignment dowels seat properly. Install timing cover bolts in correct locations (note different sizes) and tighten in sequence per service manual starting from center outward. Torque 6mm bolts to 10 Nm, 8mm bolts to 25 Nm, and 10mm bolts to 45 Nm.
    ⚠Allow RTV silicone to cure per manufacturer specifications before adding oil or starting engine.
    Torque spec

    Timing Cover Bolts12 Nm (9 lb-ft)
13. 13

    Install crankshaft pulley and accessory components
    Install crankshaft pulley ensuring proper seating on crankshaft. If crankshaft pulley bolt is torque-to-yield, use new bolt. Install and torque crankshaft pulley bolt to 180 Nm using holding tool to prevent rotation. Reinstall alternator, power steering pump, and accessory brackets. Install accessory drive belts with proper tension. Reinstall right side engine mount and remove engine support.
14. 14

    Install valve cover and sensors
    Install new valve cover gasket and verify proper seating. Install spark plugs and ignition coils. Reconnect all electrical connectors including camshaft position sensor, crankshaft position sensor, and VVT solenoid. Install valve cover bolts in sequence from center outward in multiple passes. Install PCV system and breather hoses. Install air intake assembly.
15. 15

    Refill fluids and final preparation
    Install new oil filter and drain plug with new crush washer. Fill engine with 4.5 quarts of Kia Genuine 5W-20 oil. Refill coolant to proper level if drained. Reinstall under covers and splash shields. Reconnect battery. Before starting engine, remove spark plugs and crank engine briefly to build oil pressure and verify no mechanical interference. Reinstall spark plugs.
    ⚠Initial start-up is critical. Listen carefully for abnormal noises indicating timing or mechanical issues.

Reassembly

1. Double-check all electrical connectors are properly seated and locked
2. Verify all fasteners have been tightened to specification and none were missed
3. Check for any tools or parts left in engine bay before closing
4. Ensure all fluid levels are correct before starting engine
5. Have fire extinguisher ready for initial start-up as precaution

Verification

• Perform initial start and listen carefully for any unusual noises - engine should run smoothly without rattling or knocking
• Allow engine to idle and warm to operating temperature while monitoring for leaks around timing cover and valve cover
• Check for proper oil pressure indication on instrument cluster
• Verify no check engine light or timing-related codes using scan tool
• After engine reaches operating temperature, shut off and recheck all fluid levels
• Test drive vehicle and verify normal performance, smooth idle, and proper acceleration
• After test drive, recheck for any leaks or unusual noises
• Allow engine to cool and retorque cylinder head bolts if specified in service manual (some engines require this)
• Monitor oil consumption and check for leaks over next 100 miles
• Consider oil change at 500 miles to remove any break-in debris

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