Replace the main bearings on a 2014-2019 Toyota Corolla 1.8L I4 engine, requiring complete engine removal, disassembly of the lower end, and installation of new bearing shells with precise torque specifications.

Warnings

Tools required

Parts

• Main bearing shell set (standard or oversized as measured) × 1 — Use OEM specification
• Thrust bearing set × 1 — Use OEM specification
• Main bearing cap bolts (TTY replacement required) × 10 — Use OEM specification
• Oil pan gasket × 1 — Use OEM specification
• Oil pump gasket × 1 — Use OEM specification
• Rear main seal × 1 — Use OEM specification
• Front crankshaft seal × 1 — Use OEM specification
• Valve cover gasket × 1 — Use OEM specification
• Oil drain plug crush washer × 1 — Use OEM specification
• Oil filter × 1 — Use OEM specification
• RTV silicone gasket maker (Toyota FIPG) × 1 — Use OEM specification
• Engine oil × 1 — Toyota Genuine 0W-20
• Engine coolant × 1 — Toyota Super Long Life Coolant Pink

Fluids

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

Preparation

1. Ensure vehicle is on level, stable ground with parking brake engaged
2. Disconnect negative battery cable and isolate it from terminal
3. Remove engine cover and drain engine oil completely using new crush washer on drain plug
4. Drain cooling system at radiator drain cock and lower radiator hose
5. Remove air intake system, air filter box, and intake tube
6. Remove accessory drive belts
7. Relieve fuel system pressure by removing fuel pump fuse and cranking engine until it stalls
8. Disconnect fuel lines using proper disconnect tools
9. Label and disconnect all electrical connectors, vacuum lines, and coolant hoses from engine
10. Remove exhaust manifold from catalytic converter
11. Support transmission with transmission jack
12. Remove engine mount bolts and prepare engine hoist with chains
13. Clear adequate workspace around vehicle for engine removal and stand placement

Procedure

1. 1

   Remove engine from vehicle
   With transmission supported, attach engine hoist to factory lifting points on cylinder head. Verify all connections, hoses, and wiring are disconnected. Slowly lift engine while guiding it away from transmission input shaft. Tilt engine as needed using load leveler. Once clear of engine bay, transfer engine to engine stand and secure at bellhousing mounting points.
   Torque spec

   Transmission-to-Engine Bolts55 Nm (41 lb-ft)
2. 2

   Remove external engine components
   With engine on stand, remove alternator, starter, power steering pump (if equipped), A/C compressor, water pump, thermostat housing, oil filter, and oil cooler lines. Remove valve cover, timing chain cover, timing chain, and oil pan. Remove flywheel/flexplate using proper holding tool and working in reverse star pattern. Remove oil pump assembly and pickup tube.
   Torque spec

   Flywheel Bolts95 Nm (70 lb-ft)

   Oil Pan Bolts12 Nm (9 lb-ft)

   Oil Pump Pickup Tube12 Nm (9 lb-ft)

   Cover Bolts15 Nm (11 lb-ft)
3. 3

   Mark and remove main bearing caps
   Using permanent marker, clearly mark each main bearing cap (1-5 from front to rear) with position number and orientation arrow pointing to front of engine. Mark the engine block correspondingly. Using proper socket, loosen main bearing cap bolts in reverse of tightening sequence (consult service manual). Remove bolts completely and carefully lift each cap straight up, keeping thrust bearing halves with cap #3. Place caps in numbered order on clean workspace.
   ⚠Main bearing caps are numbered and directional. Incorrect installation will destroy the engine immediately upon startup.
   Torque spec

   Main Bearing Cap Bolts75 Nm (55 lb-ft)
4. 4

   Remove crankshaft and inspect
   Carefully lift crankshaft straight up out of engine block. Remove upper bearing shells from block, keeping them in order. Inspect all crankshaft main journals for scoring, discoloration, or damage. Measure each journal diameter with micrometer at multiple points. Measure journal out-of-round and taper. All measurements must be within 0.0001 inch tolerance. If journals are worn beyond specification, crankshaft must be reground and oversized bearings used.
   ⚠Crankshaft weighs approximately 40 lbs. Use proper lifting technique to avoid injury or dropping.
   ℹ️Standard main journal diameter is 2.1653-2.1655 inches. Consult service manual for wear limits and oversize specifications.
5. 5

   Inspect and measure bearing bores
   Thoroughly clean all bearing bores in engine block and main caps using lint-free cloths and brake cleaner. Inspect for scoring, cracks, or damage. Using dial bore gauge, measure each main bearing bore in block with cap installed (using old bolts finger-tight for alignment only). Measure in-line with engine and 90 degrees across. Record all measurements. Bearing bore must be within tolerance and perfectly round.
   ⚠Any debris or contamination in bearing surfaces will cause immediate failure. Work in the cleanest possible environment.
6. 6

   Select and prepare new bearings
   Based on crankshaft journal measurements and bearing bore measurements, select correct size main bearing shells (standard, 0.25mm undersize, or 0.50mm undersize if crankshaft was reground). Clean new bearing shells with clean lint-free cloth and engine assembly lube. Do not wipe off factory coating unless instructed. Verify bearing shell tang locations align with block notches.
   ℹ️Bearing selection requires precision measurements. Consult bearing manufacturer specifications for proper clearance ranges (typically 0.0008-0.0020 inches for mains).
7. 7

   Check bearing clearances with Plastigage
   Install upper bearing shells in block (without assembly lube for Plastigage test). Place crankshaft in position. Cut pieces of Plastigage to length of bearing width and place on each main journal. Install lower bearing shells in caps. Install caps in correct positions with orientation arrows forward. Install old main cap bolts and torque to specification in proper sequence (consult service manual). Do NOT rotate crankshaft. Remove caps and measure Plastigage width using scale on package. Clearance must be within 0.0008-0.0020 inch range.
   ⚠Do not rotate crankshaft with Plastigage installed or measurements will be invalid.
   ⚠If clearances are outside specification, investigate cause before proceeding. Wrong bearing size or damaged components will destroy engine.
   Torque spec

   Main Bearing Cap Bolts75 Nm (55 lb-ft)
8. 8

   Final crankshaft installation
   Remove crankshaft and all Plastigage residue with clean cloth. Coat upper bearing shells liberally with engine assembly lube. Install upper bearing shells in block, ensuring tangs engage notches. Coat crankshaft journals with assembly lube. Carefully lower crankshaft into position. Install thrust bearing halves on bearing #3 (center main) with oil grooves facing outward. Coat lower bearing shells with assembly lube and install in caps, ensuring tangs engage cap notches.
   ℹ️Thrust bearing controls crankshaft endplay and must be installed correctly with grooved side facing outward on both halves.
9. 9

   Install main bearing caps with new bolts
   Install main bearing caps in correct numbered positions with orientation arrows pointing forward. Install NEW torque-to-yield main cap bolts finger-tight. Following exact sequence from service manual, torque all main cap bolts to 75 Nm (55 lb-ft). Then, in same sequence, rotate each bolt an additional angle as specified in service manual (typically 90 degrees). Verify crankshaft rotates freely by hand with no binding or tight spots.
   ⚠️Main cap bolts are torque-to-yield and MUST be new. Reusing old bolts will result in bolt failure and catastrophic engine damage.
   ⚠Torque sequence is critical. Consult factory service manual for exact sequence diagram before proceeding.
   Torque spec

   Main Bearing Cap Bolts75 Nm (55 lb-ft)
10. 10

    Check crankshaft endplay
    Using dial indicator with magnetic base, position indicator plunger against crankshaft snout. Pry crankshaft fully forward, zero dial indicator, then pry crankshaft fully rearward and record reading. Crankshaft endplay should be 0.002-0.009 inch. If out of specification, verify thrust bearing is correct size and properly installed.
    ⚠Excessive endplay indicates wrong thrust bearing or installation error. Insufficient endplay will cause thrust bearing failure.
11. 11

    Install oil pump and pickup tube
    Install new oil pump gasket with light coating of RTV where specified. Install oil pump assembly and torque bolts in sequence. Install oil pump pickup tube with new O-ring and torque mounting bolt. Verify pickup tube is positioned correctly in relation to oil pan depth.
    Torque spec

    Oil Pump Pickup Tube12 Nm (9 lb-ft)
12. 12

    Install rear main seal and flywheel
    Using appropriate seal driver, install new rear main seal with lip facing inward. Coat seal lip with clean engine oil. Clean flywheel and crankshaft flange thoroughly. Apply thread locker to new flywheel bolts. Install flywheel with alignment dowel. Using flywheel holding tool, torque flywheel bolts in star pattern sequence.
    ⚠Rear main seal must be driven in squarely to avoid leaks. Use proper seal driver tool sized for seal diameter.
    Torque spec

    Flywheel Bolts95 Nm (70 lb-ft)
13. 13

    Install oil pan and timing components
    Clean oil pan and block mating surfaces thoroughly. Apply new gasket or RTV bead as specified in service manual. Install oil pan and torque bolts in sequence from center outward. Install timing chain, guides, tensioner, and timing cover with new gaskets. Verify timing marks are correctly aligned. Install valve cover with new gasket.
    Torque spec

    Oil Pan Bolts12 Nm (9 lb-ft)

    Gasket Bolts19 Nm (14 lb-ft)

    Cover Bolts15 Nm (11 lb-ft)
14. 14

    Reinstall external components and engine
    Reinstall water pump, thermostat, oil filter, alternator, starter, power steering pump, and A/C compressor with proper torque specifications. Using engine hoist, carefully lower engine into vehicle while guiding transmission input shaft into clutch disc or torque converter pilot. Install engine mount bolts and transmission-to-engine bolts to specification. Reconnect all electrical connectors, vacuum lines, fuel lines, and coolant hoses per labels.
    Torque spec

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

    Mounting Bolts26 Nm (19 lb-ft)
15. 15

    Fill fluids and perform initial startup
    Install new oil drain plug crush washer and torque drain plug. Fill engine with 4.5 quarts Toyota Genuine 0W-20 oil. Fill cooling system with Toyota Super Long Life Coolant (Pink) mixture. Double-check all connections and fasteners. Reconnect battery. Before starting, disable fuel system and crank engine for 10 seconds to build oil pressure. Re-enable fuel and start engine. Check for leaks immediately. Allow engine to reach operating temperature while monitoring oil pressure gauge and listening for abnormal noises.
    ⚠️If oil pressure warning light does not extinguish within 3 seconds of startup, shut down immediately and investigate. Running engine without oil pressure will destroy new bearings instantly.
    ⚠Monitor closely for coolant, oil, or fuel leaks during initial startup. Shut down immediately if any leaks are detected.
    Torque spec

    Oil Drain Plug35 Nm (26 lb-ft)

Reassembly

1. Torque all fasteners to exact specifications using calibrated torque wrench
2. Replace all torque-to-yield (TTY) bolts with new parts - never reuse
3. Follow exact torque sequences from factory service manual, especially for main bearing caps
4. Apply assembly lube liberally to all bearing surfaces during installation
5. Verify crankshaft rotates freely by hand before declaring job complete
6. Use only specified Toyota fluids and OEM or equivalent quality parts

Verification

• Verify oil pressure reaches normal range (20+ PSI at idle when warm) within 3 seconds of startup
• Check for oil, coolant, and fuel leaks around all disturbed components
• Listen for any abnormal noises such as knocking, ticking, or rattling from lower end
• Verify engine runs smoothly without misfires or rough idle
• Monitor oil pressure gauge during test drive under various loads
• Check crankcase for excessive blowby or unusual pressure
• After 50-100 miles, recheck oil level and inspect for leaks again
• Consider oil analysis after first 500 miles to verify bearing wear is within normal break-in range

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