Complete replacement of the timing chain, guides, tensioner, and related components on the 2016-2021 Honda Civic 1.5L turbo engine. This procedure requires precise alignment of camshaft and crankshaft timing marks.

Warnings

Tools required

Parts

• Timing chain kit (includes chain, guides, tensioner) × 1 — Use OEM Honda specification
• Timing cover gasket × 1 — Use OEM specification
• Valve cover gasket × 1 — Use OEM specification
• Valve cover spark plug tube seals × 4 — Use OEM specification
• Crankshaft front seal × 1 — Use OEM specification
• Camshaft position sensor O-ring × 1 — Use OEM specification
• Crankshaft position sensor O-ring × 1 — Use OEM specification
• Oil drain plug crush washer × 1 — 94109-14000
• Engine oil and filter × 1 — Use 0W-20 specification

Fluids

• Honda Genuine 0W-20 — 4 qt
• Honda Type 2 Coolant (Blue) — 1 qt

Preparation

1. Ensure engine is completely cold. Park vehicle on level surface and engage parking brake.
2. Disconnect negative battery cable and wait 3 minutes for SRS system discharge.
3. Remove engine cover by pulling upward on front and rear clips.
4. Drain engine oil completely and install drain plug with new crush washer.
5. Drain coolant from radiator and engine block drain plugs into appropriate containers.
6. Remove air intake assembly from turbocharger to airbox including all ducting.
7. Label and disconnect all electrical connectors from valve cover (ignition coils, VVT solenoid).
8. Remove ignition coils and spark plugs to prevent accidental engine rotation damage.
9. Support engine from above using engine support fixture or hoist with load leveler.
10. Raise and secure vehicle on jack stands. Remove right front wheel and inner fender splash shield.

Procedure

1. 1

   Remove accessory drive belt and crankshaft pulley
   Remove serpentine belt by releasing tensioner. Mark rotational direction on belt if reusing. Using crankshaft holding tool, remove crankshaft pulley bolt (turn counterclockwise). This bolt is torqued to 133 lb-ft and may require impact wrench or long breaker bar. Remove crankshaft pulley from crankshaft snout.
2. 2

   Remove valve cover assembly
   Disconnect PCV hose and breather hose from valve cover. Remove valve cover bolts in reverse of tightening sequence (outside to center). Carefully lift valve cover away from cylinder head. Remove and discard old gasket and spark plug tube seals. Clean all gasket surfaces thoroughly with gasket scraper and solvent.
   ⚠Do not pry on valve cover sealing surfaces. Tap gently with rubber mallet if stuck.
3. 3

   Remove right side motor mount and bracket
   Support engine weight with support fixture from above. Remove right side engine mount bracket bolts from engine block and frame. Carefully lower or raise engine slightly using support fixture to gain clearance to timing cover. Remove motor mount bracket completely.
   ⚠Ensure engine is properly supported before removing mount. Engine must not shift during work.
4. 4

   Remove timing cover
   Remove all timing cover bolts, noting their locations (6mm, 8mm, and 10mm bolts in various positions). Gently tap timing cover with rubber mallet to break seal. Remove timing cover and discard gasket. Remove old crankshaft seal from timing cover using seal puller. Clean all sealing surfaces on block and cover thoroughly.
   ℹ️Keep timing cover bolts organized by size and location for proper reassembly.
   Torque spec

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

   Verify and document timing marks
   Rotate crankshaft clockwise to TDC on cylinder #1 (compression stroke). Verify camshaft timing marks align with cylinder head surface marks. Verify crankshaft keyway points upward at 12 o'clock position. Take clear photos of all timing marks and chain routing. Mark chain-to-sprocket relationship with paint pen on all sprockets.
   ⚠️This is the most critical step. Timing marks MUST be documented accurately. Any error will result in engine destruction.
6. 6

   Remove timing chain tensioner and guides
   Remove VVT solenoid from cylinder head. Remove timing chain tensioner bolt and carefully extract tensioner assembly. Remove upper timing chain guide bolts and guide. Remove timing chain idler sprocket bolt (center sprocket) while preventing rotation. Remove lower timing chain guide bolts and guide. Keep all components organized.
   ⚠Tensioner may be under slight spring pressure. Control removal to prevent dropping.
   Torque spec

   Timing Chain Tensioner25 Nm (18 lb-ft)

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

   Remove camshaft sprockets and timing chain
   Hold exhaust camshaft with wrench on hex section. Remove exhaust cam sprocket bolt and remove sprocket. Hold intake camshaft and remove intake cam sprocket bolt and sprocket. Remove timing chain from crankshaft sprocket. Inspect crankshaft sprocket for wear; replace if necessary. Do NOT rotate crankshaft or camshafts from this point forward.
   ⚠️After chain removal, DO NOT rotate crankshaft or camshafts independently. This will cause valve-to-piston contact and severe engine damage.
   Torque spec

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

   Inspect components and prepare new parts
   Thoroughly inspect old timing chain for wear, stretching, and damaged links. Inspect all guides and tensioner for excessive wear or cracking. Inspect sprocket teeth for wear patterns. Compare old chain length to new chain by laying side-by-side. Inspect camshaft and crankshaft journals for scoring. Prepare new tensioner by compressing it in a vise and installing retaining pin or clip to hold compressed.
   ℹ️Chain stretch beyond 1% of original length indicates overdue replacement. Guides should show minimal grooving.
9. 9

   Install new timing chain and guides
   Install lower timing chain guide and torque bolts to specification. Install crankshaft sprocket if removed (align with key). Route new timing chain around crankshaft sprocket. Install idler sprocket with chain engaged, torque bolt to specification. Install upper guide and torque bolts. Verify crankshaft is still at TDC (keyway at 12 o'clock).
   Torque spec

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

    Install camshaft sprockets
    Verify camshaft timing marks are aligned with cylinder head reference marks. Install intake camshaft sprocket with chain engaged, aligning any painted marks if reusing. Apply threadlocker to cam sprocket bolt. Hold camshaft with wrench and torque intake cam sprocket bolt to 59 lb-ft. Repeat process for exhaust camshaft sprocket. Double-check all timing marks alignment.
    ⚠️Verify all timing marks are properly aligned before tightening cam sprocket bolts. Misalignment will destroy engine.
    Torque spec

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

    Install timing chain tensioner
    Ensure new tensioner is compressed with retaining pin installed. Install tensioner to engine block and torque bolt to 18 lb-ft. Carefully remove retaining pin to allow tensioner to apply pressure to chain. Verify tensioner plunger extends and applies tension. Chain should have minimal slack when properly tensioned.
    ⚠Do not remove tensioner pin until tensioner is fully bolted in place.
    Torque spec

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

    Verify timing and perform rotation test
    Manually rotate crankshaft clockwise two complete revolutions using socket on crankshaft bolt. Stop at TDC position. Verify all timing marks realign perfectly at TDC. Verify chain tension is consistent and tensioner is functioning. If marks do not align, disassemble and correct timing before proceeding.
    ⚠️If timing marks do not align after two rotations, DO NOT continue. Disassemble and correct timing immediately.
13. 13

    Install new timing cover seal and gasket
    Install new crankshaft front seal into timing cover using seal driver. Seal should be flush with cover surface. Apply thin bead of Honda Bond HT sealant to timing cover mating surface per service manual pattern. Install new timing cover gasket. Position timing cover onto engine block, ensuring crankshaft snout enters seal properly.
    ℹ️Sealant must be applied in continuous bead. Install cover within 5 minutes of sealant application.
14. 14

    Install timing cover bolts
    Install all timing cover bolts finger-tight in their correct locations (6mm, 8mm, and 10mm). Following the sequence specified in service manual, torque 6mm bolts to 7 lb-ft, 8mm bolts to 18 lb-ft, and 10mm bolts to 33 lb-ft. Allow sealant to cure for 30 minutes before adding fluids.
    ℹ️Tightening sequence is critical to prevent cover warping and oil leaks. Refer to service manual diagram.
    Torque spec

    Timing Cover Bolts12 Nm (9 lb-ft)
15. 15

    Reinstall crankshaft pulley and accessory components
    Clean crankshaft snout and pulley mating surfaces. Install crankshaft pulley onto crankshaft, aligning keyway. Using holding tool, torque crankshaft pulley bolt to 133 lb-ft. Install serpentine belt following marked direction. Reinstall motor mount bracket and bolts, torque to specification. Remove engine support fixture.
16. 16

    Install valve cover with new gasket
    Install new spark plug tube seals into valve cover. Install new valve cover gasket onto valve cover, ensuring proper seating in grooves. Apply small dab of sealant at camshaft cap corners. Position valve cover onto cylinder head. Install valve cover bolts and torque to 7 lb-ft in sequence from center outward, making multiple passes.
    ⚠Over-torquing valve cover bolts will crush gasket and cause oil leaks. Use torque wrench, not impact tools.

Reassembly

1. Reinstall VVT solenoid with new O-ring, torque to 7 lb-ft.
2. Reinstall spark plugs and ignition coils, reconnect all electrical connectors.
3. Reinstall air intake system and all ducting to turbocharger.
4. Reinstall inner fender splash shield and right front wheel.
5. Refill engine with 4.0 quarts Honda 0W-20 engine oil and install new oil filter.
6. Refill cooling system with Honda Type 2 coolant to proper level.
7. Reconnect negative battery cable and reinstall engine cover.

Verification

• Before starting engine, rotate crankshaft by hand two complete revolutions to verify no binding or interference.
• Prime oil system by cranking engine with fuel pump fuse removed until oil pressure lamp extinguishes.
• Start engine and verify immediate oil pressure. Listen for any abnormal timing chain noise or rattling.
• Allow engine to reach operating temperature while monitoring for leaks around timing cover and valve cover.
• Verify check engine light does not illuminate. Scan for any stored DTCs related to camshaft/crankshaft correlation.
• Road test vehicle under light load, then verify no abnormal noises, vibrations, or performance issues.
• Re-check all fluid levels after test drive and verify no leaks at timing cover, valve cover, or oil drain plug.
• Clear any adaptive learning values and allow ECU to relearn idle and fuel trims over next 50 miles of varied driving.

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