Pistons - All

Complete removal and replacement of all pistons in the 2018-2024 Honda Accord 1.5L turbo engine, requiring engine removal and full disassembly including cylinder head removal and crankshaft access.

Warnings

Tools required

Parts

• Complete piston and ring set (4 pistons) × 1 — Use OEM specification
• Connecting rod bearing set × 1 — Use OEM specification
• Main bearing set × 1 — Use OEM specification
• Cylinder head gasket × 1 — Use OEM specification
• Oil pan gasket × 1 — Use OEM specification
• Valve cover gasket × 1 — Use OEM specification
• Timing chain cover gasket × 1 — Use OEM specification
• Timing chain and tensioner kit × 1 — Use OEM specification
• Oil pump O-ring and seal kit × 1 — Use OEM specification
• Engine oil filter × 1 — Use OEM specification
• Oil drain plug crush washer × 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
• Thermostat and gasket × 1 — Use OEM specification
• Water pump gasket/O-rings × 1 — Use OEM specification
• Front crankshaft seal × 1 — Use OEM specification
• Rear main seal × 1 — Use OEM specification
• Exhaust manifold gasket × 1 — Use OEM specification
• Intake manifold gasket × 1 — Use OEM specification
• Engine assembly lubricant × 1 — Use OEM specification

Fluids

• Honda Genuine 0W-20 engine oil — 4 qt
• Honda Type 2 Coolant (Blue) — 6 qt
• Honda DW-1 ATF — 8 qt

Preparation

1. Park vehicle on level surface and engage parking brake
2. Disconnect negative battery terminal and wait 3 minutes for SRS system discharge
3. Remove engine cover and air intake assembly
4. Drain engine coolant into appropriate container using radiator drain valve
5. Drain engine oil and remove oil filter
6. Drain automatic transmission fluid if equipped
7. Relieve fuel system pressure by removing fuel pump fuse and running engine until it stalls
8. Disconnect fuel lines from fuel rail using proper disconnect tools
9. Remove front wheels and lower splash shields
10. Support engine with hoist from above using proper lifting brackets
11. Remove front motor mount and transmission mounts
12. Disconnect all electrical connectors, vacuum lines, coolant hoses, and control cables from engine
13. Remove exhaust manifold and turbocharger assembly from cylinder head
14. Disconnect driveshafts from transmission and secure aside
15. Remove radiator, cooling fans, and AC condenser (if removing engine forward)
16. Carefully lift engine and transmission assembly from vehicle and mount on engine stand
17. Separate transmission from engine block

Procedure

1. 1

   Remove external engine components
   With engine on stand, remove alternator, AC compressor, power steering pump (if equipped), starter motor, and all accessory brackets. Remove intake manifold, throttle body, fuel rail with injectors, and all wiring harnesses. Label and photograph all connector positions.
2. 2

   Remove timing chain cover and timing components
   Remove valve cover using appropriate socket. Set engine to TDC on cylinder #1 by aligning timing marks. Remove timing chain tensioner, timing chain guides, and timing chain. Remove camshafts and mark bearing caps for reinstallation in original positions. Keep all components organized by cylinder.
   Torque spec

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

   Remove cylinder head
   Remove cylinder head bolts in reverse of tightening sequence (start from outside, work toward center). Carefully lift cylinder head off engine block. Place on clean padded surface. Inspect head gasket surface for damage or warping.
   ⚠Cylinder head bolts are TTY and must be discarded. Do not reuse under any circumstances.
   Torque spec

   Cylinder Head Bolts65 Nm (48 lb-ft)
4. 4

   Remove oil pan and oil pickup
   Unbolt oil pan and carefully pry loose using plastic scraper. Remove oil pan gasket. Remove oil pump pickup tube from oil pump housing. Inspect oil pump pickup screen for debris.
   Torque spec

   Oil Pan Bolts12 Nm (9 lb-ft)

   Oil Pump Pickup Tube12 Nm (9 lb-ft)
5. 5

   Remove ridge from cylinder bores
   Using ridge reamer, carefully remove ridge at top of each cylinder bore where piston rings have not contacted. Follow ridge reamer tool instructions carefully to avoid gouging cylinder walls. Clean metal shavings thoroughly from cylinder bores using lint-free shop towels and solvent.
   ⚠Ridge must be removed before attempting piston removal or connecting rod damage will occur.
6. 6

   Mark and remove connecting rod caps
   Rotate crankshaft to position pistons at mid-stroke for easy access. Mark each connecting rod and cap with corresponding cylinder number and orientation using number stamps or marker. Remove connecting rod cap bolts and caps. Keep caps matched with their rods.
   ⚠Connecting rod bolts are TTY and must be replaced. Mark rods and caps before removal as they are not interchangeable.
   Torque spec

   Connecting Rod Bolts45 Nm (33 lb-ft)
7. 7

   Remove piston and rod assemblies
   Push each piston and connecting rod assembly up and out through top of cylinder bore. Protect crankshaft journals by covering rod bolts with rubber hose or protective caps. Keep each piston with its original connecting rod. Store assemblies in order.
8. 8

   Remove and inspect crankshaft and main bearings
   Mark main bearing caps for position and orientation. Remove main bearing cap bolts in reverse sequence (outside to inside). Carefully lift crankshaft from block. Inspect crankshaft journals for scoring, wear, or damage. Measure journal diameters with micrometer. Remove main bearings and inspect for wear patterns.
   ⚠Main bearing cap bolts are TTY and must be replaced. Main bearing caps must be reinstalled in exact original position and orientation.
   Torque spec

   Main Bearing Cap Bolts75 Nm (55 lb-ft)
9. 9

   Inspect and measure cylinder bores
   Clean cylinder bores thoroughly with solvent and lint-free cloths. Using cylinder bore gauge or dial bore gauge, measure each bore at top, middle, and bottom in two perpendicular directions. Check for taper (top to bottom wear) and out-of-round condition. Record all measurements. Standard bore is 73.0mm with wear limit of 0.05mm. If beyond specification, cylinders must be bored and honed to next oversize, or block replaced.
   ℹ️Cylinder measurements are critical. If cylinders are worn beyond specification, pistons and rings alone will not solve oil consumption or compression issues.
10. 10

    Remove old pistons from connecting rods and prepare new pistons
    Using piston pin removal tool or press, remove piston pins from connecting rods. Keep old pistons for reference. Install new pistons onto connecting rods ensuring directional arrow on piston crown faces timing belt side (front) of engine. Install new piston pins and circlips. Ensure circlips are fully seated in grooves.
    ⚠Piston orientation is critical. Arrow on piston crown must face front of engine or severe damage will occur.
11. 11

    Install and gap piston rings
    Using ring installation tool, install oil control ring expander first, then oil control ring rails (upper and lower). Install second compression ring with identification mark facing up. Install top compression ring with identification mark facing up. Using feeler gauge, check ring end gaps by inserting each ring into corresponding cylinder bore and measuring gap. Top ring gap should be 0.20-0.30mm, second ring 0.35-0.50mm. File rings if necessary to achieve proper gap. Stagger ring gaps 120 degrees apart, avoiding piston pin axis.
    ⚠Incorrect ring gap can cause ring breakage and engine damage. Rings must be gapped in the cylinder they will be installed in.
12. 12

    Install new main bearings and crankshaft
    Clean engine block main bearing saddles thoroughly. Install new main bearings in block and caps, ensuring bearing tangs engage notches. Do not interchange bearings between positions. Apply assembly lubricant to all bearing surfaces. Carefully lower crankshaft into block. Install upper main bearings and caps in original positions with match marks aligned. Install new main bearing cap bolts hand-tight initially.
    ℹ️Do not use engine oil for initial assembly. Use proper assembly lubricant to prevent damage during first startup.
13. 13

    Torque main bearing caps
    Following Honda tightening sequence (center outward), torque main bearing cap bolts to 75 Nm (55 lb-ft). Then tighten each bolt an additional 90 degrees using torque angle gauge. Verify crankshaft rotates freely by hand after torquing. Check bearing clearances using Plastigage if reusing crankshaft. Clearance should be 0.020-0.047mm.
    ⚠TTY bolts must be tightened in two stages: initial torque plus angle rotation. Do not skip angle tightening step.
    Torque spec

    Main Bearing Cap Bolts75 Nm (55 lb-ft)
14. 14

    Install connecting rod bearings
    Clean connecting rods and caps thoroughly. Install new connecting rod bearings in rods and caps, ensuring bearing tangs engage notches properly. Apply assembly lubricant liberally to bearing surfaces and crankshaft rod journals.
15. 15

    Install piston and rod assemblies into cylinders
    Apply assembly lubricant to cylinder walls. Cover connecting rod bolts with rubber protectors. Using piston ring compressor, compress rings on piston #1. Ensure piston directional arrow faces front of engine. Carefully insert piston into cylinder #1 bore, tapping gently with wooden hammer handle. Guide connecting rod onto crankshaft journal. Remove rod bolt protectors. Install rod cap in original orientation. Install new connecting rod bolts hand-tight. Repeat for remaining pistons in order.
    ⚠Do not force pistons into bores. Rings must be fully compressed in ring compressor. Use wooden or plastic tool only to tap piston crown.
16. 16

    Torque connecting rod bolts
    Torque each connecting rod cap bolt to 45 Nm (33 lb-ft), then tighten an additional 90 degrees using torque angle gauge. Verify crankshaft still rotates freely after all rods are torqued. Check rod bearing clearances using Plastigage if desired. Clearance should be 0.025-0.053mm.
    ⚠Connecting rod bolts are TTY. Tighten using torque plus angle method with new bolts only.
    Torque spec

    Connecting Rod Bolts45 Nm (33 lb-ft)
17. 17

    Install oil pump, pickup tube, and oil pan
    Install oil pump with new O-rings and gaskets. Install oil pump pickup tube and torque mounting bolts. Apply Honda Bond or equivalent gasket maker to oil pan mating surface in specified bead pattern. Install new oil pan gasket if equipped, or use gasket maker only per Honda specifications. Install oil pan and torque bolts evenly in crisscross pattern.
    Torque spec

    Oil Pump Pickup Tube12 Nm (9 lb-ft)

    Oil Pan Bolts12 Nm (9 lb-ft)
18. 18

    Install cylinder head
    Clean cylinder head and block mating surfaces thoroughly. Ensure no old gasket material remains. Place new cylinder head gasket on block with markings facing up. Carefully lower cylinder head onto block, aligning dowel pins. Install new cylinder head bolts hand-tight. Following Honda tightening sequence (center outward in specified pattern), torque cylinder head bolts to 65 Nm (48 lb-ft), then tighten each bolt an additional 90 degrees. Make second pass tightening each bolt another 90 degrees (180 degrees total angle after initial torque).
    ⚠Cylinder head bolts are TTY and require torque plus two-stage angle tightening. Use only new bolts and follow sequence exactly.
    Torque spec

    Cylinder Head Bolts65 Nm (48 lb-ft)
19. 19

    Install timing components and front covers
    Install camshafts with bearing caps in original positions and orientations. Ensure camshaft and crankshaft are at TDC for cylinder #1. Install new timing chain, guides, and tensioner per Honda timing procedure. Verify timing marks align correctly. Install timing chain cover with new gasket. Install valve cover with new gasket and torque cover bolts.
    Torque spec

    Cover Bolts15 Nm (11 lb-ft)
20. 20

    Reinstall external components and prepare for installation
    Reinstall intake manifold with new gasket, fuel rail, throttle body, and all sensors. Install alternator, AC compressor, and accessory brackets. Install new front crankshaft seal. Reinstall all wiring harnesses and connectors. Double-check all torque specifications and connections before engine installation.
    Torque spec

    Gasket Bolts19 Nm (14 lb-ft)

    Mounting Bolts26 Nm (19 lb-ft)

Reassembly

1. Mate transmission to engine using new pilot bearing if equipped, ensuring proper alignment
2. Carefully lower engine and transmission assembly into vehicle using engine hoist
3. Install and torque motor mounts and transmission mounts to specification
4. Reconnect driveshafts using new retaining clips
5. Install turbocharger and exhaust manifold with new gaskets
6. Reconnect all coolant hoses, vacuum lines, electrical connectors, and control cables
7. Install radiator, cooling fans, and AC condenser
8. Reinstall front splash shields and wheels
9. Install new oil filter and fill engine with Honda Genuine 0W-20 oil to proper level (4.0 quarts)
10. Fill cooling system with Honda Type 2 Blue coolant (6.0 quarts total capacity)
11. Refill transmission with Honda DW-1 ATF if drained (8.0 quarts)
12. Reconnect fuel lines ensuring proper connection
13. Reinstall fuel pump fuse
14. Reconnect battery negative terminal

Verification

• Before starting: Verify all fluid levels are correct, all electrical connectors are secured, and no tools remain in engine bay
• Turn ignition to ON position without starting to prime fuel system. Check for fuel leaks
• Rotate engine by hand using crankshaft bolt to ensure free rotation and proper timing
• Start engine and immediately check for oil pressure light to extinguish within 5 seconds
• Check for any fluid leaks, unusual noises, or vibrations during initial startup
• Allow engine to reach operating temperature while monitoring coolant temperature gauge
• Bleed cooling system by opening bleeder valve until air-free coolant flows
• Check for coolant, oil, and fuel leaks after reaching operating temperature
• Rev engine to 3000 RPM several times and verify smooth operation without misfires
• Perform road test to verify proper power delivery, no abnormal noises, and no warning lights
• After initial test drive, recheck all fluid levels and inspect for leaks
• Recommend oil change after first 500 miles to remove any break-in debris
• Clear any diagnostic trouble codes if present and verify no codes return

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