Complete removal and replacement of all four pistons in the 2018-2024 Toyota Camry 2.5L I4 engine, requiring engine removal, disassembly, and rebuild with new piston rings and connecting rod bearings.

Warnings

Tools required

Parts

• Piston set with rings (4 pistons) × 1 — Use OEM specification
• Connecting rod bearing set × 1 — Use OEM specification
• Cylinder head gasket × 1 — Use OEM specification
• Oil pan gasket × 1 — Use OEM specification
• Oil pump pickup tube O-ring × 1 — Use OEM specification
• Timing chain cover gasket × 1 — Use OEM specification
• Valve cover gasket × 1 — Use OEM specification
• Connecting rod bolts (TTY) × 8 — Use OEM specification
• Cylinder head bolts (TTY) × 1 — Use OEM specification
• Main bearing cap bolts (TTY) × 1 — Use OEM specification
• Oil drain plug crush washer × 1 — Use OEM specification
• Engine oil 0W-20 × 5 — Toyota Genuine 0W-20
• Engine coolant × 10 — Toyota Super Long Life Coolant Pink
• Oil filter × 1 — Use OEM specification
• Air filter × 1 — Use OEM specification
• RTV silicone sealant (Toyota FIPG) × 1 — Use OEM specification
• Engine assembly lubricant × 1 — Use OEM specification

Fluids

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

Preparation

1. Disconnect negative battery terminal and wait 90 seconds for airbag system to discharge
2. Drain engine oil completely and remove oil filter
3. Drain engine coolant from radiator and engine block drain plugs
4. Remove engine cover and air intake system including air filter box
5. Remove exhaust manifold and catalytic converter assembly
6. Disconnect all electrical connectors, vacuum lines, and fuel lines from engine (relieve fuel pressure first)
7. Remove accessory drive belts and all engine accessories (alternator, A/C compressor, power steering pump if equipped)
8. Remove radiator, cooling fans, and all coolant hoses
9. Support transmission with jack and remove engine mounting bolts
10. Attach engine hoist to factory lifting points and carefully remove engine from vehicle
11. Mount engine securely on engine stand
12. Remove intake manifold and throttle body assembly
13. Remove valve cover
14. Remove timing chain cover, timing chain, and camshafts following proper procedure
15. Remove cylinder head and set aside on clean surface with head gasket side up

Procedure

1. 1

   Remove oil pan and oil pump
   With engine inverted on stand, remove all oil pan bolts in reverse of tightening sequence. Carefully separate oil pan from block using plastic scraper if needed. Remove oil pump pickup tube bolts and remove pickup tube. Unbolt and remove oil pump assembly from front of block.
   Torque spec

   Oil Pan Bolts12 Nm (9 lb-ft)

   Oil Pump Pickup Tube12 Nm (9 lb-ft)
2. 2

   Remove ridge from cylinder bores
   Using a ridge reamer, carefully remove the carbon ridge at the top of each cylinder bore. This ridge forms at the top ring travel limit and must be removed to prevent piston ring damage during removal. Clean thoroughly after reaming to remove all metal shavings.
   ⚠Do not cut into the cylinder wall below the ridge. Remove only the ridge material to prevent piston ring breakage during removal.
3. 3

   Mark and remove connecting rod caps
   Using permanent marker or stamping tool, mark each connecting rod and cap with cylinder number (1-4) and orientation (mark should face forward/timing chain side). Verify marks are clear before proceeding. Remove connecting rod cap bolts from all four connecting rods. Keep each cap with its corresponding rod.
   ℹ️Connecting rods are matched sets with their caps. Never mix caps between rods or install backwards.
   Torque spec

   Connecting Rod Bolts45 Nm (33 lb-ft)
4. 4

   Remove piston and connecting rod assemblies
   Rotate crankshaft to position piston at bottom dead center. Using wooden dowel or hammer handle through top of cylinder, gently push piston and connecting rod assembly up and out through top of block. Guide rod bolts carefully to avoid scratching crankshaft journals. Remove all four assemblies and keep each with its corresponding cap. Place assemblies on clean work surface.
   ⚠Protect crankshaft journals from rod bolt contact. Scratches on journals will cause bearing failure.
5. 5

   Disassemble pistons from connecting rods
   Using piston ring expander, carefully remove all three rings from each piston (two compression rings and one oil control ring). Note ring orientation and groove positions. Remove piston pin circlips and press out piston pins to separate pistons from rods. Keep all components organized by cylinder number.
   ⚠Piston rings are brittle and will break if over-expanded. Use proper ring expander tool and expand only enough to clear piston.
6. 6

   Inspect and measure cylinder bores
   Clean cylinder bores thoroughly with solvent and lint-free cloth. Using cylinder bore gauge or inside micrometer, measure each bore at top, middle, and bottom in both thrust and non-thrust directions. Record all measurements. Calculate taper (top to bottom difference) and out-of-round (thrust vs non-thrust difference). Service limit for taper is 0.05mm (0.002 in), out-of-round is 0.05mm (0.002 in). If within limits, proceed. If beyond limits, block requires machining.
   ⚠Cylinders beyond wear specifications require honing or boring/oversized pistons. Installing standard pistons in worn bores will cause oil consumption and blow-by.
7. 7

   Inspect crankshaft and measure bearing clearances
   Clean all crankshaft rod journals with solvent. Inspect for scoring, discoloration, or damage. Measure journal diameter with micrometer. Install new connecting rod bearings (without lubrication) into rods and caps. Place Plastigage strip on each journal, install cap with old bolts torqued to specification, then remove and measure Plastigage width. Clearance should be 0.020-0.038mm (0.0008-0.0015 in). Record all measurements.
   ℹ️Do not rotate crankshaft with Plastigage installed. This will give false readings.
8. 8

   Prepare and check new pistons
   Clean new pistons thoroughly. Verify piston-to-bore clearance by measuring piston diameter at thrust faces and subtracting from bore measurement. Clearance should be 0.020-0.047mm (0.0008-0.0019 in). Check new piston ring end gaps by inserting each ring into its corresponding bore (use piston to push ring square in bore). Measure gap with feeler gauge. Top compression ring: 0.16-0.31mm (0.006-0.012 in), Second ring: 0.40-0.55mm (0.016-0.022 in), Oil ring: 0.12-0.55mm (0.005-0.022 in).
   ⚠Insufficient ring end gap will cause ring ends to butt together when hot, leading to ring breakage and cylinder scoring.
9. 9

   Assemble pistons to connecting rods
   Install piston pins to connect pistons to connecting rods. Piston directional mark (usually an arrow or front mark) must face timing chain side of engine. Connecting rod orientation marks must face forward. Heat piston to approximately 80°C (176°F) if needed for pin installation. Install new piston pin circlips ensuring they seat properly in grooves.
   ⚠Incorrect piston or rod orientation will cause interference with valves or cylinder head. Verify orientation before final assembly.
10. 10

    Install piston rings
    Using piston ring expander tool, install rings in order: oil control ring (expander and rails first, then top and bottom rails), second compression ring, then top compression ring. Install rings with manufacturer markings facing up. Stagger ring end gaps 120 degrees apart, keeping gaps away from thrust surfaces and piston pin area. Oil control ring gaps should be 180 degrees apart.
    ⚠Ring orientation is critical. TOP mark or dot must face up. Upside-down rings will cause immediate oil consumption.
11. 11

    Install piston and rod assemblies
    Lubricate cylinder bores, pistons, rings, and crankshaft rod journals with engine assembly lubricant. Install rod bearing halves into connecting rods (ensure locating tabs engage notches). Using piston ring compressor, compress rings fully and carefully tap piston into bore with rubber mallet or hammer handle. Ensure piston directional mark faces timing chain side. Guide connecting rod onto crankshaft journal, protecting journal from rod bolt contact.
12. 12

    Install connecting rod caps and torque
    Install correct cap onto each connecting rod, ensuring orientation marks align. Install NEW connecting rod bolts (old TTY bolts must not be reused). Lubricate bolt threads with clean engine oil. Torque bolts to 45 Nm (33 lb-ft), then tighten an additional 90 degrees using torque angle gauge. After torquing all rods, verify crankshaft rotates smoothly by hand.
    ⚠️TTY connecting rod bolts MUST be replaced. Reusing old bolts will result in bolt failure and catastrophic engine damage.
    Torque spec

    Connecting Rod Bolts45 Nm (33 lb-ft)
13. 13

    Reinstall cylinder head
    Clean cylinder head and block mating surfaces thoroughly with gasket scraper and solvent. Ensure no old gasket material remains. Place new cylinder head gasket on block with orientation markings (TOP, FRONT, UP) correctly positioned. Carefully lower cylinder head onto block, aligning dowel pins. Install NEW cylinder head bolts with light oil on threads. Torque in proper sequence: first to 65 Nm (48 lb-ft), then additional 90 degrees, then additional 90 degrees (total 180 degrees rotation after initial torque).
    ⚠️Cylinder head bolts are TTY and must be replaced. Follow exact torque sequence from center outward to prevent head warping.
    Torque spec

    Cylinder Head Bolts65 Nm (48 lb-ft)

    Gasket Surface Bolts20 Nm (15 lb-ft)
14. 14

    Reinstall timing components and front cover
    Install camshafts following proper timing procedure with crankshaft at TDC cylinder #1. Install timing chain with alignment marks properly positioned. Install timing chain tensioner and guides. Apply thin bead of Toyota FIPG sealant to timing chain cover mating surfaces. Install cover and torque bolts to specification. Install crankshaft pulley and torque mounting bolt.
    Torque spec

    Cover Bolts16 Nm (12 lb-ft)

    Mounting Bolts47 Nm (35 lb-ft)
15. 15

    Install oil pump and oil pan
    Install oil pump to block and torque mounting bolts. Install oil pump pickup tube with new O-ring, torque bolts to 12 Nm (9 lb-ft). Clean oil pan and block mating surfaces. Apply continuous bead of Toyota FIPG sealant to oil pan flange (3-4mm bead). Install oil pan within 3 minutes of sealant application. Torque oil pan bolts to 12 Nm (9 lb-ft) in crisscross pattern from center outward. Allow sealant to cure 2+ hours before filling with oil.
    Torque spec

    Oil Pan Bolts12 Nm (9 lb-ft)

    Oil Pump Pickup Tube12 Nm (9 lb-ft)

    Mounting Bolts47 Nm (35 lb-ft)

Reassembly

1. Complete remaining engine assembly in reverse order of disassembly: valve cover, intake manifold, exhaust manifold
2. Install all engine accessories and reconnect all electrical connectors, vacuum lines, and fuel lines
3. Position engine into vehicle using hoist and align with transmission
4. Install engine mounting bolts and torque to 47 Nm (35 lb-ft)
5. Reconnect exhaust system, coolant hoses, radiator, and cooling fans
6. Install accessory drive belts with proper tension
7. Install air intake system and engine cover
8. Install new oil filter and fill engine with 5 quarts Toyota Genuine 0W-20 oil
9. Fill cooling system with Toyota Super Long Life Coolant (Pink) mixed 50/50 with distilled water
10. Reconnect battery negative terminal

Verification

• Double-check all torque specifications, especially TTY bolts with proper angle tightening
• Verify crankshaft rotates freely by hand through two complete rotations before starting
• Prime oil system by cranking engine with fuel pump fuse removed until oil pressure gauge shows pressure
• Start engine and check immediately for oil pressure indication (should show within 5 seconds)
• Listen for abnormal noises such as knocking, ticking, or rattling that would indicate improper assembly
• Allow engine to warm to operating temperature and check for oil, coolant, or fuel leaks
• Monitor oil pressure at idle (should be 4.5+ psi) and at 3000 rpm (should be 43-85 psi)
• Check for proper coolant circulation and thermostat operation
• Perform test drive and monitor engine performance, oil pressure, and temperature under load
• After initial 20-minute run time, shut off engine, allow to cool, and recheck oil level and all fluid levels
• Inspect for any new leaks after test drive
• Reset ECU codes if check engine light appears due to battery disconnection

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