Complete removal and reinstallation of the 1.8L I4 engine from a 2014-2019 Toyota Corolla, including disconnection of all engine accessories, drivetrain separation, and engine mount removal.

Warnings

Tools required

Parts

• Engine oil drain plug crush washer × 1 — 90430-12031
• Engine coolant (Pink Super Long Life) × 2 — 00272-SLLC2
• Lower radiator hose (if reusing old engine) × 1 — Use OEM specification
• Upper radiator hose (if reusing old engine) × 1 — Use OEM specification
• Engine oil and filter × 1 — 0W-20 synthetic
• Exhaust manifold gasket × 1 — 17173-0T030
• Anti-seize compound × 1 — Use copper-based
• Transmission fluid (if servicing) × 1 — Toyota WS ATF

Fluids

• Toyota Genuine 0W-20 — 4.5 qt
• Toyota Super Long Life Coolant (Pink) — 7.5 qt
• Toyota WS ATF — 10 qt

Preparation

1. Ensure vehicle is on level ground with parking brake engaged and wheels chocked
2. Disconnect negative battery terminal and isolate cable end, wait 90 seconds for airbag system discharge
3. Remove engine cover and plastic undertray shields from below vehicle
4. Drain engine coolant by opening radiator drain cock and removing radiator cap when cool
5. Drain engine oil and remove oil filter
6. Relieve fuel system pressure by removing fuel pump relay and cranking engine until it stalls
7. Support vehicle on jack stands at manufacturer-specified lift points
8. Remove front wheels and set aside
9. Remove air intake assembly from air filter box to throttle body
10. Label all electrical connectors, vacuum lines, and hoses with tape/marker before disconnecting

Procedure

1. 1

   Disconnect Engine Electrical and Sensors
   Disconnect all engine electrical connections including: alternator main power cable and connector, starter wiring harness, engine ground straps (multiple locations on block and transmission bell housing), all ignition coil connectors, throttle body connector, fuel injector harness, both oxygen sensor connectors, coolant temperature sensor, oil pressure sensor, knock sensor, camshaft position sensor, crankshaft position sensor, and ECM main engine harness connector at firewall. Carefully release wire harness clips securing engine harness to block and route harness clear of engine.
2. 2

   Remove Accessory Drive Components
   Remove serpentine drive belt by rotating tensioner clockwise with 14mm socket. Remove power steering pump mounting bolts and secure pump to frame with wire without disconnecting hydraulic lines. Remove AC compressor mounting bolts and secure compressor to frame without disconnecting refrigerant lines. Remove alternator mounting bolts and set alternator aside. If equipped with CVT transmission, disconnect transmission cooler lines at radiator using flare nut wrench.
   Torque spec

   Power Steering Pump Bolts25 Nm (18 lb-ft)

   AC Compressor Bolts25 Nm (18 lb-ft)

   Alternator Mounting Bolts50 Nm (37 lb-ft)
3. 3

   Disconnect Fuel and Coolant Lines
   Using fuel line disconnect tools, separate fuel supply and return lines at engine. Plug open fuel lines to prevent contamination. Disconnect upper and lower radiator hoses at engine using hose clamp pliers. Disconnect heater hoses at firewall. Remove coolant overflow reservoir if it interferes with removal. Cap all open coolant passages on engine to prevent debris entry.
   ⚠Have shop towels ready for fuel spillage. Fuel system may retain residual pressure even after relief procedure.
4. 4

   Disconnect Exhaust System
   Working from below vehicle, apply penetrating oil to exhaust manifold nuts and allow to soak. Remove front exhaust pipe from exhaust manifold by removing manifold nuts working from outer nuts toward center (hot to cold pattern). Support front exhaust pipe with wire to prevent damage. Inspect manifold studs for damage and replace if necessary.
   ⚠Exhaust studs are prone to breaking on high-mileage vehicles. Have replacement studs available.
   Torque spec

   Exhaust Manifold Nuts30 Nm (22 lb-ft)
5. 5

   Remove Starter Motor
   Remove starter motor heat shield if equipped. Disconnect starter electrical connections (main power cable and signal wire). Remove two starter mounting bolts and extract starter motor from bell housing. Inspect flywheel teeth through starter opening for wear or damage.
   Torque spec

   Mounting Bolts26 Nm (19 lb-ft)
6. 6

   Separate Transmission from Engine
   Support transmission with transmission jack positioned directly under transmission pan. Remove all transmission-to-engine bell housing bolts (typically 6-8 bolts in various positions around perimeter). On manual transmission models, disconnect clutch hydraulic line at transmission. On CVT models, ensure all cooler lines and electrical connections are disconnected. Verify transmission is fully supported before proceeding. Carefully separate transmission from engine by sliding transmission straight back on jack, ensuring input shaft clears clutch disc (manual) or torque converter remains with transmission (automatic). Lower transmission and remove from under vehicle.
   ⚠️Transmission weighs approximately 100-120 lbs. Ensure transmission jack is secure and has adequate weight capacity.
   ⚠Keep transmission level while separating to prevent input shaft or torque converter damage.
   Torque spec

   Transmission-to-Engine Bolts55 Nm (41 lb-ft)
7. 7

   Attach Engine Hoist and Remove Engine Mounts
   Attach engine hoist chains or straps to designated engine lift points (typically front and rear lift brackets on cylinder head). Use leveling attachment to balance engine. Apply slight upward tension to take weight off mounts but do not lift. Remove right-side engine mount by first removing mount-to-frame bolts, then mount-to-block bolts. Remove front engine mount and rear engine mount in same manner. Remove left-side transaxle mount bracket if still attached to engine block.
   ⚠️Do not position any body parts under engine during lifting operation. Engine can shift unexpectedly during initial lift.
   Torque spec

   Engine Mount-to-Frame Bolts75 Nm (55 lb-ft)

   Engine Mount-to-Block Bolts65 Nm (48 lb-ft)
8. 8

   Extract Engine from Vehicle
   Make final visual inspection to ensure all hoses, wires, and mounts are disconnected. Slowly raise engine with hoist while guiding clear of radiator support, firewall, and frame rails. Tilt engine as needed using leveling attachment to clear obstacles. Once engine clears radiator support, carefully lift and pull engine forward out of engine bay. Lower engine onto sturdy engine stand or wood blocks and secure before releasing hoist tension.
   ⚠Have assistant guide engine during extraction to prevent damage to radiator, AC condenser, and body panels.
9. 9

   Inspect and Prepare Replacement Engine
   If installing replacement engine, transfer all necessary components from old engine: alternator, AC compressor, power steering pump, engine mounts and brackets, all sensors, ignition coils, exhaust manifold, flywheel (manual transmission), and any other accessories. Clean all mating surfaces thoroughly. Apply anti-seize to exhaust manifold studs. Replace all gaskets including exhaust manifold gasket. Verify replacement engine matches original specifications including engine code and build date range.
   ℹ️Document engine serial number and verify against vehicle VIN to ensure proper engine match for emissions compliance.
10. 10

    Install Engine into Vehicle
    Attach hoist to prepared engine using same lift points. Carefully guide engine into engine bay, reversing extraction path. Tilt and level engine to clear radiator support and align with engine mount locations. Lower engine slowly while aligning mounts to frame brackets. Install engine mount-to-frame bolts first (hand tight), then install mount-to-block bolts. Torque all engine mount bolts in sequence: block bolts first, then frame bolts. Verify engine sits level and all mounts are properly seated before removing hoist.
    Torque spec

    Engine Mount-to-Block Bolts65 Nm (48 lb-ft)

    Engine Mount-to-Frame Bolts75 Nm (55 lb-ft)
11. 11

    Reconnect Transmission to Engine
    Raise transmission into position using transmission jack, ensuring input shaft (manual) or torque converter (automatic) is properly aligned. On automatic transmission, verify torque converter is fully seated in pump by measuring depth before mating to engine. Guide transmission forward, aligning dowel pins and ensuring input shaft enters clutch disc/pilot bearing smoothly. Install all transmission-to-engine bolts and torque in star pattern to specification. Reconnect clutch hydraulic line (manual) or transmission cooler lines (CVT).
    ⚠Do not use transmission-to-engine bolts to draw transmission to engine. Transmission should mate flush with minimal force.
    Torque spec

    Transmission-to-Engine Bolts55 Nm (41 lb-ft)
12. 12

    Reinstall Starter and Exhaust Connection
    Install starter motor into bell housing, ensuring gear meshes properly with flywheel. Torque starter mounting bolts and reconnect electrical connections. Clean exhaust manifold and front pipe mating surfaces. Install new exhaust manifold gasket. Apply anti-seize to manifold studs. Connect front exhaust pipe to manifold and torque nuts in hot-to-cold pattern (center to outer).
    Torque spec

    Mounting Bolts26 Nm (19 lb-ft)

    Exhaust Manifold Nuts30 Nm (22 lb-ft)
13. 13

    Reinstall Accessory Components
    Install alternator and torque mounting bolts. Position AC compressor onto brackets and torque mounting bolts. Position power steering pump and torque mounting bolts. Install serpentine drive belt following routing diagram on fan shroud or radiator support. Verify belt is properly seated in all pulley grooves and tensioner operates correctly.
    Torque spec

    Alternator Mounting Bolts50 Nm (37 lb-ft)

    AC Compressor Bolts25 Nm (18 lb-ft)

    Power Steering Pump Bolts25 Nm (18 lb-ft)
14. 14

    Reconnect All Engine Connections
    Reconnect all coolant hoses (upper radiator, lower radiator, heater hoses) and secure with new clamps. Reconnect fuel supply and return lines, ensuring positive engagement of quick-connect fittings. Route engine wiring harness along original path and secure with all clips. Reconnect all electrical connectors verified against labels: ECM connector, alternator, starter, all sensors (camshaft, crankshaft, coolant temp, O2 sensors, knock sensor, oil pressure), fuel injector harness, ignition coils, and throttle body. Reconnect all engine ground straps to block and bell housing. Double-check all connections.
    ℹ️Ensure all wire harness clips are secured to prevent contact with hot exhaust or moving components.
15. 15

    Fill Fluids and Final Preparation
    Install new oil filter and fill engine with 4.5 quarts of Toyota Genuine 0W-20 engine oil. Install oil drain plug with new crush washer and torque to specification. Fill cooling system with Toyota Super Long Life Coolant (Pink) at radiator and overflow reservoir. If transmission was serviced, fill with appropriate quantity of Toyota WS ATF. Reinstall air intake assembly. Reinstall engine covers and undertray shields. Install front wheels and torque lug nuts. Reconnect negative battery terminal.
    Torque spec

    Oil Drain Plug35 Nm (26 lb-ft)

Reassembly

1. Reassembly is described in steps 9-15 above, following reverse order of disassembly with critical torque specifications applied
2. All gaskets, seals, and crush washers must be replaced during reassembly
3. Verify all electrical connections are properly seated and secured with retaining clips
4. Ensure all fluid levels are correct before initial startup

Verification

• Before starting engine, verify all tools and equipment are removed from engine bay
• Perform visual inspection for any disconnected hoses, wires, or loose components
• Check that all fluid levels are correct: engine oil, coolant, transmission fluid, power steering fluid
• Turn ignition to ON position (without starting) and verify no warning lights indicate obvious problems
• Start engine and immediately check for leaks at all connection points: coolant hoses, fuel lines, oil drain plug, transmission mating surface
• Verify oil pressure light extinguishes within 2-3 seconds of startup
• Allow engine to reach operating temperature while monitoring coolant level and temperature gauge
• Bleed cooling system by running engine with radiator cap off until thermostat opens and air bubbles stop, then top off coolant
• Check for proper operation of all accessories: alternator charging, AC compressor engagement, power steering assist
• Verify no abnormal noises from engine, transmission, or accessory components
• Test drive vehicle to verify proper engine performance, transmission shifting, and no warning lights
• Recheck all fluid levels after test drive and inspect for leaks
• Clear any diagnostic trouble codes that may have set during battery disconnection
• Verify emissions readiness monitors complete drive cycle for inspection compliance

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