This procedure covers removal and replacement of the timing chain guide on the 2AR-FE 2.5L I4 engine, requiring removal of timing cover and repositioning of timing chain components.

Warnings

Tools required

Parts

• Timing chain guide × 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
• Engine oil and filter × 1 — Use OEM specification
• Engine coolant × 1 — Use OEM specification

Fluids

• Toyota Genuine 0W-20 — 5 qt
• Toyota Super Long Life Coolant (Pink) — 10 qt

Preparation

1. Park vehicle on level surface and engage parking brake
2. Disconnect negative battery cable and wait 90 seconds for airbag system to discharge
3. Remove engine cover by pulling upward on front corners
4. Drain engine oil completely and remove oil filter
5. Drain engine coolant from radiator drain cock and lower hose
6. Remove right front wheel and inner fender liner for crankshaft pulley access
7. Support engine from above using engine support fixture or from below with floor jack and wood block under oil pan

Procedure

1. 1

   Remove accessory drive belt and components
   Rotate tensioner clockwise to release tension and remove serpentine belt. Remove alternator mounting bolts and reposition alternator aside without disconnecting wiring. Remove power steering pump mounting bolts and secure pump aside without disconnecting hoses.
2. 2

   Remove right engine mount
   With engine properly supported, remove right engine mount bracket bolts. Remove the engine mount insulator and bracket to provide access to timing cover area. Keep all bolts organized for reinstallation.
3. 3

   Remove crankshaft pulley
   Use crankshaft pulley holding tool to prevent rotation. Remove crankshaft pulley bolt using breaker bar (turns counterclockwise). Remove crankshaft pulley from crankshaft snout. Inspect woodruff key position.
   Torque spec

   Crankshaft pulley bolt193 Nm (142 lb-ft)
4. 4

   Remove valve cover
   Disconnect ignition coils electrical connectors and remove all four ignition coils. Remove PCV hoses and ventilation connections from valve cover. Remove valve cover bolts in reverse of tightening sequence (outside to inside pattern). Carefully lift valve cover off and remove old gasket material.
5. 5

   Remove timing cover
   Disconnect necessary wiring harness clips from timing cover area. Remove all timing cover bolts noting their different lengths and positions. There are multiple 10mm bolts (14 Nm) and several 8mm bolts (25 Nm) around the perimeter. Carefully pry timing cover away from engine block using plastic pry tools. Remove and discard old gasket.
   ⚠Do not pry against gasket mating surfaces as damage will cause oil leaks.
6. 6

   Verify and mark timing positions
   Rotate crankshaft until No. 1 piston is at TDC compression stroke. Verify timing marks: crankshaft timing mark aligned with block mark, camshaft timing marks on sprockets aligned with marks on bearing caps (intake and exhaust camshafts). Use paint pen to mark chain-to-sprocket positions on both camshaft sprockets and crankshaft sprocket. Take clear photos of all timing marks.
   ⚠️Triple-check timing mark alignment before proceeding. This is the critical reference point for reassembly.
7. 7

   Remove timing chain tensioner
   Locate timing chain tensioner on right side of engine. Remove tensioner bolt and carefully extract tensioner assembly. Note the tensioner plunger position. Use a small screwdriver or pin to lock tensioner plunger in compressed position for reinstallation.
   ⚠Tensioner is spring-loaded. Control removal to prevent dropping components.
8. 8

   Remove camshaft sprocket bolts and chain
   Hold each camshaft hex portion with wrench to prevent rotation. Remove both camshaft sprocket bolts. Carefully remove both camshaft sprockets while keeping timing chain engaged on sprockets. Lift timing chain and sprockets together as an assembly off crankshaft sprocket. Support camshafts to prevent rotation.
   ⚠️Do not allow camshafts to rotate from marked position once sprockets are removed.
9. 9

   Remove timing chain guide
   Locate timing chain guide bolts (typically 2-3 bolts depending on guide being replaced). Remove guide mounting bolts and extract worn timing chain guide. Inspect guide wear pattern and verify replacement guide matches original. Clean mounting surfaces on engine block thoroughly.
   Torque spec

   Chain guide bolts9 Nm (80 lb-ft)
10. 10

    Install new timing chain guide
    Position new timing chain guide in mounting location. Install guide bolts and tighten to specification. Verify guide is properly seated and positioned to support chain travel path. Inspect adjacent guides for wear if accessible.
    ℹ️Replace guide bolts if threads show wear or stretching per torque spec note.
    Torque spec

    Chain guide bolts9 Nm (80 lb-ft)
11. 11

    Reinstall timing chain and sprockets
    Verify crankshaft and camshafts remain in TDC position. Place timing chain onto crankshaft sprocket. Route chain up around both camshaft sprockets ensuring chain is properly seated in guide. Align paint marks made during disassembly exactly. Install both camshaft sprockets onto camshafts while holding camshafts to prevent rotation. Install camshaft sprocket bolts finger-tight.
    ⚠️Verify all timing marks align perfectly before tightening any bolts. Misalignment will cause engine damage.
12. 12

    Torque camshaft sprockets and install tensioner
    Hold each camshaft with wrench on hex section and torque sprocket bolts to specification. Release tensioner plunger lock pin and install tensioner assembly into block. Install tensioner bolt and torque to specification. Verify chain has proper tension and all timing marks still align.
13. 13

    Install timing cover
    Clean all gasket surfaces thoroughly with razor blade scraper. Apply continuous bead of Toyota Genuine RTV silicone to timing cover per service manual pattern (3-4mm bead). Install new crankshaft front seal into timing cover if not already installed. Position timing cover onto engine block carefully, ensuring alignment dowels engage. Install all timing cover bolts in sequence (8mm bolts first to 25 Nm, then 10mm bolts to 14 Nm). Allow RTV to cure per manufacturer instructions before adding oil.
    ℹ️Do not overtighten timing cover bolts as cover is aluminum and easily warped.
14. 14

    Install crankshaft pulley
    Clean crankshaft snout and pulley bore. Align pulley with woodruff key and slide onto crankshaft. Install crankshaft pulley bolt and use holding tool to prevent rotation. Torque bolt to specification. Verify pulley rotates smoothly without binding.
    Torque spec

    Crankshaft pulley bolt193 Nm (142 lb-ft)
15. 15

    Install valve cover and complete assembly
    Install new valve cover gasket and spark plug tube seals. Clean valve cover mating surface. Position valve cover and install bolts in proper sequence (center outward pattern) to specified torque. Install ignition coils and reconnect electrical connectors. Reinstall PCV hoses. Install right engine mount bracket and insulator. Install power steering pump, alternator, and serpentine belt. Install fender liner and wheel.

Reassembly

1. Reconnect negative battery cable after all assembly is complete
2. Fill engine with 5 quarts Toyota Genuine 0W-20 oil and new oil filter
3. Refill cooling system with Toyota Super Long Life Coolant to proper level
4. Double-check all electrical connections, hoses, and fasteners
5. Verify no tools or parts remain in engine compartment

Verification

• Prime oil system by cranking engine for 5 seconds without starting (disable fuel or ignition)
• Start engine and verify immediate oil pressure indication
• Listen for any abnormal timing chain noise during initial startup
• Allow engine to reach operating temperature and verify no oil or coolant leaks from timing cover or valve cover
• Check for proper engine idle and smooth acceleration response
• Verify Check Engine Light does not illuminate
• Road test vehicle and monitor engine performance under various loads
• Recheck oil level after test drive and top off if necessary

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