engine

Rocker Arms - All

for 2021 Honda Civic 1.5L I4 Turbo · FWD

Editorial review:Chris Hackleman — Master Technician · 20+ years · Jeff Moore — Master Mechanic · 20+ years

Difficulty

Advanced

Time

3.0 h

Tools

Steps

✓Expert-verified. Personally reviewed and approved by OLP's master technicians (Chris Hackleman & Jeff Moore — 20+ years each). Always follow the vehicle's factory service information and torque specs.

Complete replacement of all rocker arms on the 1.5L turbo engine, requiring removal of valve cover and rocker arm shaft assembly.

Warnings

⚠️Engine must be completely cold before starting work. Hot components can cause severe burns.

⚠Do not rotate the engine with rocker arms removed as this will cause valve-to-piston contact and severe engine damage.

⚠Rocker arm shaft bolts must be tightened evenly and in the correct sequence to prevent warping.

ℹ️Mark all components during disassembly to ensure proper reinstallation orientation.

Tools required

Socket set (8mm, 10mm, 12mm)Essential

Torque wrench (10-50 Nm range)Essential

Ratchet and extensionsEssential

Camshaft holding tool or breaker barEssential

Valve cover gasket scraper (plastic)

Clean shop towelsEssential

Oil catch panEssential

Feeler gauge set

Timing marks reference guideEssential

Magnetic parts tray

As an Amazon Associate and Autel/ANCEL partner, OLP earns from qualifying purchases — how we link. This never changes the specs we publish.

Parts

Rocker arm shaft assembly (intake) × 1 — 14431-5AA-A00
Rocker arm shaft assembly (exhaust) × 1 — 14441-5AA-A00
Valve cover gasket × 1 — 12030-5AA-A00
Spark plug tube seals × 4 — Use OEM specification
Valve cover grommets × 1 — Use OEM specification
Engine oil × 1 — Honda Genuine 0W-20

As an Amazon Associate and Autel/ANCEL partner, OLP earns from qualifying purchases — how we link. This never changes the specs we publish.

Fluids

Honda Genuine 0W-20 — 4 qt

Preparation

Ensure engine is completely cold (allow minimum 2 hours after last operation)
Disconnect negative battery terminal and wait 3 minutes for system discharge
Remove engine cover by pulling upward on front clips
Position oil catch pan beneath engine
Photograph or mark all connector and hose positions before removal
Verify you have correct replacement rocker arm assemblies for intake and exhaust sides

Procedure

1
Remove ignition coils and spark plugs
Disconnect the four ignition coil electrical connectors. Remove the 10mm bolts securing each coil and lift coils straight out. Use a spark plug socket to remove all four spark plugs, noting their condition. Store in order for inspection.
2
Remove PCV hose and breather connections
Disconnect the PCV hose from the valve cover port on the driver's side. Disconnect the breather hose from the valve cover on the passenger side. Remove any wire harness clips attached to the valve cover.
3
Remove valve cover
Remove all valve cover bolts in reverse of tightening sequence (start from outside, work toward center). Carefully lift valve cover off, tapping gently with a plastic mallet if stuck. Inspect gasket and sealing surfaces for damage. Clean any oil from exposed cylinder head surface.
Torque spec
Cover Bolts15 Nm (11 lb-ft)
4
Verify camshaft timing position
Rotate engine by hand using a 19mm socket on the crankshaft pulley bolt until cylinder #1 is at TDC compression stroke. Verify timing marks on camshaft sprockets align with cylinder head surface marks. This is critical for proper reassembly. Take a clear reference photo.
⚠If timing is not verified now, engine damage may occur during reassembly.
5
Remove rocker arm shaft assembly bolts
Loosen all rocker arm shaft bolts gradually in a crisscross pattern, working from the ends toward the center, loosening each bolt 1/4 turn at a time. This prevents shaft warping. Remove bolts completely once all are loose. Keep intake and exhaust shaft bolts separate if different lengths.
⚠Do not loosen bolts in sequence or unevenly as this can warp the shaft or damage bearing surfaces.
Torque spec
Rocker Arm Shaft Bolts25 Nm (18 lb-ft)
6
Remove rocker arm shaft assemblies
Carefully lift the intake rocker arm shaft assembly (passenger side) straight up and away from cylinder head. Repeat for exhaust rocker arm shaft assembly (driver side). Inspect valve stem tips for unusual wear patterns. Place assemblies on clean work surface and cover to prevent debris contamination.
7
Inspect and prepare cylinder head
Inspect all valve stem tips for wear, scoring, or uneven contact patterns. Check camshaft lobes for wear or scoring. Clean cylinder head sealing surface thoroughly using plastic scraper and clean towels. Wipe down camshaft bearing journals with clean oil-dampened cloth. Verify no debris has fallen into engine.
8
Prepare new rocker arm assemblies
Remove new rocker arm shaft assemblies from packaging. Verify correct identification (intake vs exhaust). Lubricate all rocker arm contact surfaces and shaft journals with fresh Honda 0W-20 engine oil. Verify rocker arms move freely on shafts. Check that oil passages in shafts are not obstructed.
9
Install new rocker arm shaft assemblies
Position exhaust rocker arm shaft assembly (driver side) onto cylinder head, ensuring proper orientation with oil holes facing down. Install intake rocker arm shaft assembly (passenger side) similarly. Verify all rocker arms are positioned correctly on valve stems and camshaft lobes. Hand-thread all shaft bolts to prevent cross-threading.
⚠Ensure shaft orientation is correct with oil feed holes facing downward toward valve stems.
10
Torque rocker arm shaft bolts
Tighten all rocker arm shaft bolts evenly in a crisscross pattern working from center outward. Make multiple passes, gradually increasing torque: first pass to 10 Nm, second pass to 18 Nm, final pass to specification. This ensures even clamping and prevents shaft warping.
⚠Tighten evenly in multiple passes to prevent shaft distortion.
Torque spec
Rocker Arm Shaft Bolts25 Nm (18 lb-ft)
11
Verify valve operation
Slowly rotate engine by hand two complete revolutions using crankshaft bolt. Feel for any abnormal resistance or binding. Verify all rocker arms move smoothly and timing marks return to proper alignment. Check that no valves contact pistons during rotation.
⚠️If any binding or unusual resistance is felt, STOP immediately and inspect for improper installation.
12
Install new valve cover gasket
Position new valve cover gasket onto valve cover (not cylinder head). Install new spark plug tube seals into valve cover recesses, ensuring they seat fully. Install new grommets for PCV and breather ports. Verify gasket is properly seated in valve cover groove all around perimeter.
13
Install valve cover
Carefully position valve cover onto cylinder head, aligning all bolt holes and ensuring gasket stays in place. Hand-thread all valve cover bolts. Tighten bolts in sequence starting from center and working outward in a spiral pattern to specification. Do not overtighten as this can damage gasket.
Torque spec
Cover Bolts15 Nm (11 lb-ft)
14
Reinstall ignition system and connections
Install spark plugs to specification (not in provided torque list, follow Honda specification of 18 Nm). Install ignition coils ensuring they seat fully into spark plug tubes. Torque coil bolts to specification. Reconnect all four coil electrical connectors. Reconnect PCV and breather hoses.
15
Final inspection and oil service
Drain engine oil completely and replace with fresh Honda Genuine 0W-20 (4.0 quarts). Install new oil filter. Reconnect battery negative terminal. Reinstall engine cover. Double-check all electrical connections, hoses, and fasteners are secure.

Reassembly

Torque specifications are critical for rocker arm shaft bolts - use proper torque wrench and tighten evenly
Valve cover bolt sequence prevents gasket leaks - start from center and work outward
Fresh oil is required as contamination may have occurred during service
All timing marks must align properly before and after rocker arm installation

Verification

Start engine and listen for unusual valvetrain noise - ticking or tapping indicates improper installation
Allow engine to reach operating temperature and verify no oil leaks from valve cover
Check for smooth idle with no misfires or rough running
Verify no check engine lights illuminate after test drive
Monitor oil level and consumption for first 100 miles to ensure proper sealing

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