Complete replacement of the timing chain, guides, tensioner, and related components on the 2019-2024 Toyota RAV4 2.5L I4 engine, requiring removal of the valve cover, timing cover, and precise engine timing alignment.

Warnings

Tools required

Parts

• Timing chain kit (includes chain, guides, tensioner) × 1 — Use OEM 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 oil seal × 1 — Use OEM specification
• Oil drain plug crush washer × 1 — Use OEM specification
• Engine oil filter × 1 — Use OEM specification
• RTV silicone sealant (Toyota 08826-00080) × 1 — 08826-00080
• VVT-i oil control valve gaskets (if disturbed) × 2 — Use OEM specification

Fluids

• Toyota Genuine 0W-20 Engine Oil — 5 qt
• Toyota Super Long Life Coolant (Pink) — 2 qt

Preparation

1. Ensure engine is completely cold (minimum 2 hours after last operation)
2. Disconnect negative battery cable and wait 90 seconds for airbag system discharge
3. Raise vehicle on jack stands and remove front right wheel and splash shield for access to crankshaft pulley
4. Place oil drain pan under engine and drain engine oil completely, replacing drain plug with new crush washer
5. Drain approximately 2 quarts of coolant from radiator drain to lower coolant level below water pump
6. Remove engine cover and air intake assembly for top-side access
7. Support engine from below with floor jack and block of wood under oil pan, or install engine support fixture from above
8. Label all electrical connectors and hoses with tape for reassembly reference

Procedure

1. 1

   Remove valve cover assembly
   Disconnect ignition coil connectors and remove all four ignition coils. Disconnect PCV hoses, breather hoses, and any wiring harnesses attached to valve cover. Remove valve cover bolts in reverse of tightening sequence (from outside toward center). Carefully lift valve cover off, tapping gently with rubber mallet if stuck. Inspect valve cover gasket and spark plug tube seals for damage.
2. 2

   Remove accessory drive belt and crankshaft pulley
   Rotate belt tensioner clockwise and remove serpentine belt. Using crankshaft pulley holder tool or impact wrench, remove crankshaft pulley bolt (turn counterclockwise). Remove crankshaft pulley from front of engine. Mark relationship between pulley and crankshaft if reusing. Inspect pulley keyway and crankshaft snout for damage.
3. 3

   Remove engine mount and bracket for timing cover access
   With engine properly supported, remove right-side engine mount bolts and lift mount away. Remove engine mount bracket bolted to timing cover and engine block. This provides necessary clearance for timing cover removal. Keep all fasteners organized by location.
4. 4

   Remove timing cover
   Disconnect crankshaft position sensor and camshaft position sensor electrical connectors. Remove all timing cover bolts, noting different sizes: 6mm, 8mm, and 10mm bolts are used in specific locations. Carefully pry timing cover away from engine block using plastic pry tool at designated pry points. Remove timing cover and inspect timing cover gasket. Clean all RTV residue from mating surfaces on engine block and timing cover using plastic scraper only (do not use metal tools on aluminum surfaces).
5. 5

   Verify and document engine timing marks
   Rotate crankshaft clockwise (using 19mm socket on crankshaft bolt location) until timing marks align: crankshaft sprocket mark aligned with oil pump housing mark, both camshaft sprocket timing marks aligned with cylinder head top surface marks, and TDC mark on crankshaft pulley area. Take multiple photographs from different angles. Use paint pen to mark chain-to-sprocket positions if chain is being reused (though replacement is strongly recommended). Verify engine is at TDC cylinder #1 compression stroke.
6. 6

   Remove timing chain tensioner and guides
   Remove timing chain tensioner bolt and carefully extract tensioner assembly. Note tensioner plunger position. Remove upper timing chain guide bolts and guide. Remove lower timing chain guide (if equipped). Remove idler sprocket bolt while holding idler sprocket stationary. Keep all components organized for inspection and 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 sprockets and timing chain
   Hold each camshaft at the hex section (typically between lobes) using adjustable wrench. Remove both camshaft sprocket bolts. Carefully slide camshaft sprockets forward off camshafts while supporting timing chain. Once sprockets are free, remove timing chain from crankshaft sprocket and lift entire chain assembly out. Remove crankshaft sprocket if replacement is needed (pull straight off). Inspect all sprocket teeth for wear, cracks, or damage.
   Torque spec

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

   Inspect all components and prepare for reassembly
   Inspect camshaft and crankshaft journals for scoring or damage. Check timing chain guides for wear grooves deeper than 1mm. Inspect tensioner plunger for smooth operation. Verify all mating surfaces are completely clean and free of old gasket material or RTV. If replacing crankshaft seal, carefully pry out old seal and install new seal using seal driver, ensuring it sits flush and square. Apply light coat of engine oil to seal lip.
9. 9

   Install new timing chain and sprockets
   If removed, install crankshaft sprocket onto crankshaft (align keyway). Confirm crankshaft is still at TDC mark. Route new timing chain around crankshaft sprocket. Install both camshaft sprockets onto chain, aligning colored chain links (or marked links) with sprocket timing marks per manufacturer specifications. Slide camshaft sprockets onto camshafts, ensuring timing marks align with cylinder head marks. Verify all three sprockets show correct timing alignment before proceeding.
10. 10

    Install idler sprocket, guides, and tensioner
    Install lower timing chain guide (if equipped). Install idler sprocket with timing chain properly engaged and torque bolt to specification. Install upper timing chain guide and torque bolts. Compress new timing chain tensioner plunger and install retaining pin or clip to hold it in compressed position. Install tensioner onto engine and torque bolt to specification. Carefully remove tensioner retaining pin to apply tension to chain. Rotate crankshaft two complete revolutions clockwise and verify all timing marks realign perfectly.
    Torque spec

    Timing Chain Guide Bolts12 Nm (9 lb-ft)

    Timing Chain Tensioner25 Nm (18 lb-ft)
11. 11

    Secure camshaft sprockets
    With timing verified correct, hold each camshaft at hex section and torque camshaft sprocket bolts to specification. Rotate engine two more complete revolutions and reverify all timing marks align correctly. Check timing chain tension - there should be minimal slack when pressing on chain between sprockets.
    Torque spec

    Camshaft Sprocket Bolts80 Nm (59 lb-ft)
12. 12

    Install timing cover with new gasket
    Install new timing cover gasket in position. Apply continuous bead of Toyota RTV silicone sealant (approximately 3mm diameter) to timing cover mating surface at specified locations per service manual. Install timing cover onto engine, ensuring it seats fully against block. Install all timing cover bolts finger-tight first, then torque in proper sequence: 6mm bolts first, then 8mm bolts, then 10mm bolts to their respective specifications. Reconnect crankshaft and camshaft position sensors and torque to specification.
    Torque spec

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

    Install crankshaft pulley and accessory drive
    Clean crankshaft snout and pulley bore. Install crankshaft pulley, aligning keyway. Install crankshaft pulley bolt and torque to 133 lb-ft using holder tool or impact wrench. Install serpentine belt onto all pulleys and release tensioner to apply proper tension. Verify belt is properly seated in all pulley grooves.
14. 14

    Reinstall engine mount and valve cover
    Install engine mount bracket to timing cover and engine block. Install right-side engine mount and torque all fasteners. Install new valve cover gasket and new spark plug tube seals. Apply thin bead of RTV to corners where gasket meets camshaft bearing caps (if specified). Install valve cover and torque bolts in sequence from center outward in three progressive passes to final specification. Reinstall ignition coils and reconnect all electrical connectors.
15. 15

    Final assembly and fluid fill
    Reinstall engine mount components. Install new oil filter and fill engine with 5 quarts of Toyota Genuine 0W-20 engine oil. Refill coolant system to proper level with Toyota Super Long Life Coolant. Reinstall splash shield and wheel. Lower vehicle. Reinstall air intake assembly and engine cover. Reconnect negative battery cable.

Reassembly

1. Allow RTV sealant to cure for minimum 30 minutes before starting engine
2. Double-check all electrical connectors are properly seated and locked
3. Verify all bolts and fasteners have been reinstalled and torqued to specification
4. Ensure no tools or rags remain in engine bay

Verification

• Check oil level on dipstick and verify at full mark
• Check coolant level in reservoir and verify at full cold mark
• Start engine and verify it starts normally without unusual noises or timing-related rough idle
• Monitor for oil leaks around timing cover, valve cover, and oil filter during first 5 minutes of operation
• Check for coolant leaks around timing cover and water pump area
• Allow engine to reach operating temperature and verify smooth idle with no check engine light
• After engine cools, recheck oil and coolant levels and top off if necessary
• Test drive vehicle and verify normal acceleration, smooth operation at all RPM ranges, and no abnormal engine noises
• Scan for diagnostic trouble codes and verify no timing-related codes are present

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