Complete replacement of piston rings on all four cylinders, requiring full engine disassembly including cylinder head and crankshaft removal to access pistons.

Warnings

Tools required

Parts

• Piston ring set - all pistons × 1 — Use OEM specification
• Cylinder head gasket × 1 — Use OEM specification
• Cylinder head bolt set (TTY) × 1 — Use OEM specification
• Connecting rod bolt set (TTY) × 1 — Use OEM specification
• Main bearing cap bolt set (TTY) × 1 — Use OEM specification
• Oil pan gasket × 1 — Use OEM specification
• Timing chain cover gasket/seal × 1 — Use OEM specification
• Valve cover gasket with grommets × 1 — Use OEM specification
• Oil filter × 1 — Use OEM specification
• Oil drain plug crush washer × 1 — Use OEM specification
• Intake manifold gasket × 1 — Use OEM specification
• Exhaust manifold gasket × 1 — Use OEM specification
• Water pump O-rings/gasket × 1 — Use OEM specification
• Thermostat O-ring × 1 — Use OEM specification
• Crankshaft seal (front) × 1 — Use OEM specification
• Camshaft seals × 2 — Use OEM specification

Fluids

• Toyota Genuine 0W-20 engine oil — 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 isolate terminal
3. Drain engine oil completely and remove oil filter
4. Drain cooling system into suitable container for reuse or disposal
5. Remove engine cover and air intake assembly
6. Label and photograph all electrical connectors, vacuum lines, and hose routing before disconnection
7. Relieve fuel system pressure per service manual procedure
8. Remove accessory drive belts
9. Support engine from above with hoist or from below with jack and secure fixture

Procedure

1. 1

   Remove cylinder head assembly
   Disconnect all electrical connectors, coolant hoses, and fuel lines from cylinder head. Remove exhaust manifold and intake manifold. Remove valve cover. Set engine to TDC on cylinder #1 and mark timing chain alignment. Remove timing chain tensioner, guides, and chain. Remove cylinder head bolts in reverse of tightening sequence (outside-to-inside pattern). Carefully lift cylinder head from block and place on clean work surface.
2. 2

   Remove oil pan and oil pump
   Remove oil pan bolts in reverse sequence and carefully separate pan from block using plastic scraper. Remove oil pump pickup tube mounting bolt and remove pickup tube. Remove oil pump assembly by removing mounting bolts. Inspect oil pump condition and replace if wear is evident.
3. 3

   Remove piston and connecting rod assemblies
   Rotate crankshaft to position each piston at bottom dead center. Use ridge reamer to remove any ridge at top of cylinder bore wear area - this prevents ring breakage during piston removal. Mark each connecting rod cap and rod with cylinder number using permanent marker or stamp. Remove connecting rod cap bolts. Push piston and rod assembly out through top of cylinder using wooden dowel or hammer handle. Install rod caps back on rods immediately to prevent mixing. Place assemblies in order on clean work surface.
4. 4

   Inspect and measure cylinder bores
   Clean cylinder bores thoroughly with solvent and lint-free cloth. Using dial bore gauge or inside micrometer, measure each cylinder bore diameter at top, middle, and bottom positions, both parallel and perpendicular to crankshaft. Record all measurements. Maximum allowable taper is 0.0020 inch, maximum out-of-round is 0.0016 inch. If cylinders exceed these limits, engine block requires machining. Check for scoring, scratches, or damage that would prevent proper ring sealing.
5. 5

   Remove old piston rings and clean pistons
   Using piston ring expander tool or careful hand removal, remove all three rings from each piston (two compression rings and one oil control ring). Clean ring grooves thoroughly using broken ring piece or groove cleaning tool. Remove all carbon deposits from piston crown and skirt using solvent and plastic scraper - do not scratch aluminum. Clean oil return holes in oil ring groove with small drill bit or wire. Inspect pistons for cracks, scoring, or damage. Measure piston diameter at skirt 90 degrees to pin bore.
6. 6

   Hone cylinder bores
   Using ball-hone or flex-hone with 240-320 grit stones, hone each cylinder bore to create proper crosshatch pattern for ring seating. Move hone up and down at approximately 60 strokes per minute while rotating at 300-400 RPM to achieve 45-60 degree crosshatch angle. Hone only enough to establish fresh surface - typically 10-15 seconds per cylinder. Clean bores immediately with hot soapy water and stiff brush, then wipe with clean white cloth until no residue appears. Coat bores lightly with clean engine oil.
7. 7

   Check piston ring end gaps
   Select rings for each piston according to cylinder measurement. Place each ring squarely in its respective cylinder bore about 1 inch below deck surface using inverted piston to square it. Measure end gap with feeler gauge. Top compression ring gap should be 0.010-0.016 inch, second ring 0.012-0.018 inch, oil ring rails 0.008-0.028 inch. If gaps are too tight, carefully file ring ends square. Mark each ring set for its designated cylinder.
8. 8

   Install new piston rings
   Install oil control ring first: install expander spacer in bottom groove, then install lower rail by spiraling into groove (do not use ring expander tool on rails), then install upper rail. Position end gaps 180 degrees apart. Install second compression ring with marking facing up using ring expander tool. Install top compression ring with marking facing up. Stagger all ring end gaps 120 degrees apart, with no gaps aligned with pin bore axis. Verify rings rotate freely in grooves.
9. 9

   Prepare crankshaft and main bearing caps
   With crankshaft still installed in block, inspect main bearing journals and rod journals for scoring or damage. Measure all journals with micrometer and compare to specifications. Clean all bearing surfaces thoroughly. If bearing clearances will be checked (recommended), cut Plastigage strips to length and place on each journal. Carefully install main bearing caps in proper orientation following sequence marks.
10. 10

    Install piston and rod assemblies
    Coat cylinder bores, pistons, and rings with clean engine assembly lube or oil. Ensure connecting rod bearing inserts are clean and properly seated in rods and caps. Install piston ring compressor on piston and compress all rings fully. Rotate crankshaft to position journal for cylinder #1 at bottom dead center. Insert rod with piston into cylinder #1 from top, ensuring orientation mark faces front of engine. Gently tap piston crown with wooden hammer handle while guiding rod onto crankshaft journal. Install rod cap in correct orientation and install new connecting rod bolts finger-tight. Repeat for all cylinders in order.
11. 11

    Torque connecting rod bolts
    Torque connecting rod bolts in two stages: First, torque to 45 Nm (33 lb-ft) initial specification. Then rotate each bolt an additional 90 degrees using angle gauge. These are TTY bolts and must not be reused. Verify rod side clearance is within specification (0.0063-0.0138 inch) using feeler gauge. Check that crankshaft rotates freely by hand after all rods are installed.
    Torque spec

    Connecting Rod Bolts45 Nm (33 lb-ft)
12. 12

    Install oil pump and oil pan
    Install oil pump with new gasket or O-rings and torque mounting bolts to 27 Nm (20 lb-ft). Install oil pump pickup tube with new O-ring and torque to 12 Nm (9 lb-ft). Clean oil pan and block mating surfaces completely. Install new oil pan gasket or apply RTV sealant per factory specification in continuous 3-4mm bead. Install oil pan and torque bolts in sequence from center outward to 12 Nm (9 lb-ft). Allow RTV to cure per manufacturer instructions before filling with oil.
    Torque spec

    Oil Pump Pickup Tube12 Nm (9 lb-ft)

    Oil Pan Bolts12 Nm (9 lb-ft)

    Mounting Bolts27 Nm (20 lb-ft)
13. 13

    Prepare and install cylinder head
    Clean cylinder head mating surface and engine block deck surface thoroughly with solvent and plastic scraper - surfaces must be perfectly clean and flat. Inspect block deck and head surface for warpage using precision straight edge. Install new cylinder head gasket on block with orientation marks facing up. Carefully lower cylinder head onto block, aligning dowel pins. Install new cylinder head bolts (TTY - do not reuse old bolts) and hand-tighten in sequence.
14. 14

    Torque cylinder head bolts
    Torque cylinder head bolts in proper sequence (center outward pattern) using three-step process: First pass torque all bolts to 65 Nm (48 lb-ft). Second pass rotate all bolts 90 degrees in sequence using angle gauge. Third pass rotate all bolts an additional 90 degrees in sequence (total 180 degrees). Verify timing marks are still aligned before proceeding.
    Torque spec

    Cylinder Head Bolts65 Nm (48 lb-ft)
15. 15

    Install timing chain and finalize assembly
    Install timing chain with marks aligned per factory specification. Install chain guides and tensioner. Install timing chain cover with new gasket and torque cover bolts to 16 Nm (12 lb-ft). Install valve cover with new gasket and torque in sequence per specification. Reinstall intake manifold, exhaust manifold, and all accessories. Reconnect all electrical connectors, hoses, and lines per photographs taken during disassembly. Install new oil filter and fill engine with 5.0 quarts Toyota Genuine 0W-20 oil. Refill cooling system with 10.0 quarts Toyota Super Long Life Coolant. Reconnect battery.
    Torque spec

    Cover Bolts16 Nm (12 lb-ft)

Reassembly

1. Double-check all torque specifications were followed and TTY bolts were replaced
2. Verify all electrical connectors are fully seated and locked
3. Confirm all fluid levels are correct before starting engine
4. Check that no tools or materials were left in engine compartment

Verification

• Perform initial start and listen for abnormal noises - engine should run smoothly without knocking or ticking
• Monitor oil pressure gauge - should read normal pressure within 3-5 seconds of starting
• Check for oil leaks around oil pan, timing cover, and valve cover while engine idles
• Allow engine to reach operating temperature and verify cooling system functions properly
• Check for coolant or oil leaks around cylinder head gasket area
• Perform test drive and monitor for proper power delivery, no misfires, and no excessive oil consumption
• After 500 miles, re-check oil level and inspect for leaks - some oil consumption during ring break-in is normal
• Change oil and filter at 1000 miles to remove break-in debris

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