Valve Job - Complete

Complete valve job involving removal of cylinder head, valve grinding/lapping or replacement, valve seat machining, and reassembly with new valve stem seals and gaskets.

Warnings

Tools required

Parts

• Cylinder head gasket kit × 1 — Use OEM Honda head gasket kit
• Valve cover gasket and grommets × 1 — Use OEM specification
• Timing cover gasket × 1 — Use OEM specification
• Exhaust manifold gasket × 1 — Use OEM specification
• Intake manifold gasket × 1 — Use OEM specification
• Valve stem seals (set of 16) × 1 — Use OEM Honda valve seals
• Cylinder head bolts (TTY) × 10 — Use OEM - torque-to-yield bolts must be replaced
• Engine oil × 1 — Honda Genuine 0W-20
• Engine coolant × 1 — Honda Type 2 Blue coolant
• Valve grinding compound (fine and coarse) × 1 — Generic valve lapping compound
• Anti-seize compound × 1 — Copper-based high-temp

Fluids

• Honda Genuine 0W-20 — 4 qt
• Honda Type 2 Coolant (Blue) — 6 qt

Preparation

1. Ensure engine is completely cold and vehicle is on level ground with parking brake applied
2. Disconnect negative battery cable and wait 3 minutes for SRS system discharge
3. Drain engine coolant completely into appropriate container
4. Drain engine oil and remove oil filter
5. Remove engine cover and plastic trim panels from top of engine bay
6. Relieve fuel system pressure by removing fuel pump fuse and cranking engine until it stalls
7. Support engine from below with jack and wood block, or install engine support fixture across fender rails
8. Label all electrical connectors, vacuum lines, and hoses before disconnection for proper reassembly

Procedure

1. 1

   Remove intake and exhaust systems
   Disconnect intake air duct and air filter assembly. Remove intake manifold, disconnecting all vacuum lines, PCV hoses, and electrical connectors. Label everything. Disconnect exhaust manifold from catalytic converter. Remove heat shields as necessary. Working from hot side (center) to cold side (outer), remove exhaust manifold nuts.
   Torque spec

   Intake Manifold Bolts25 Nm (18 lb-ft)

   Exhaust Manifold Nuts30 Nm (22 lb-ft)
2. 2

   Remove valve cover and accessory components
   Disconnect ignition coil connectors and remove all four ignition coils. Remove PCV hose and breather hose from valve cover. Remove valve cover bolts in reverse of tightening sequence (outside to inside). Carefully lift valve cover off, tapping gently with rubber mallet if stuck. Disconnect VTC oil control solenoid and camshaft position sensors.
   Torque spec

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

   Set engine to TDC and lock timing
   Rotate crankshaft clockwise using bolt at front of crank until No. 1 piston is at top dead center on compression stroke. Verify timing marks on camshaft sprockets align with cylinder head surface marks. Install timing pins through camshaft sprockets into cylinder head to lock position. Mark timing chain to camshaft sprocket relationship with paint pen.
   ⚠Do not rotate engine counterclockwise. Always rotate in normal direction of rotation only.
4. 4

   Remove timing chain and camshafts
   Remove timing chain tensioner bolt and extract tensioner assembly. Remove timing chain guide if necessary. Hold camshaft on hex portion with wrench and remove camshaft sprocket bolts. Carefully remove timing chain from sprockets. Remove camshaft cap bolts in reverse sequence (outward to center) in multiple passes to prevent warping. Lift out camshafts and store in clean area. Keep intake and exhaust cams separate and labeled.
   ⚠Loosen camshaft cap bolts gradually in sequence to prevent cam journal damage.
   Torque spec

   Camshaft Sprocket Bolt80 Nm (59 lb-ft)

   Timing Chain Tensioner Bolt25 Nm (18 lb-ft)

   Camshaft Cap Bolts14 Nm (10 lb-ft)
5. 5

   Remove cylinder head
   Disconnect all remaining electrical connectors, coolant hoses, and fuel lines from cylinder head. Remove cylinder head bolts in reverse of tightening sequence (outside to inside) in multiple passes. Carefully lift cylinder head off engine block. If stuck, gently tap with rubber mallet on casting bosses only - never pry between head and block surfaces. Place cylinder head on clean wooden blocks with combustion chambers facing up.
   ⚠Never pry between head and block mating surfaces - this will damage sealing surfaces.
   Torque spec

   Cylinder Head Bolts65 Nm (48 lb-ft)
6. 6

   Disassemble valvetrain components
   Using valve spring compressor, compress each valve spring and remove valve keepers with magnetic tool. Release spring pressure and remove spring retainer, spring, and valve stem seal. Extract valve from combustion chamber side. Keep all components organized by cylinder number and intake/exhaust position. Inspect each valve for burning, pitting, or excessive wear. Measure valve stem diameter with micrometer - replace any valves worn beyond service limit.
   ⚠️Valve springs are under significant tension. Ensure valve spring compressor is properly seated before removing keepers to prevent spring from ejecting.
   ℹ️Create an organized tray system numbered 1-4 for each cylinder with separate areas for intake and exhaust valves.
7. 7

   Clean and inspect cylinder head
   Remove all carbon deposits from combustion chambers using appropriate cleaner and plastic scrapers - never use metal scrapers on aluminum. Clean all gasket surfaces thoroughly. Inspect cylinder head mating surface for warpage using precision straight edge and feeler gauges. Maximum allowable warpage is 0.002 inches - beyond this requires resurfacing. Check for cracks using dye penetrant or magnetic testing, especially between valve seats and in coolant passages.
   ⚠Use only aluminum-safe cleaning products. Harsh chemicals can damage aluminum cylinder head.
8. 8

   Machine valve seats and lap valves
   Using valve seat cutting tools or sending to machine shop, cut valve seats to proper three-angle specification (typically 30-45-60 degrees for intake, consult service data). Seats must be concentric to valve guide within 0.002 inches. After seat cutting, apply coarse grinding compound to valve face and lap valve to seat using lapping tool with back-and-forth rotating motion. Clean thoroughly and repeat with fine compound until complete grey contact band appears on both valve and seat. Final contact area should be in middle third of valve face. Clean all compound residue completely with solvent.
   ℹ️Proper valve seat width is critical - too wide causes poor sealing, too narrow causes burning. Intake seats typically 0.035-0.051 inches, exhaust 0.043-0.059 inches.
9. 9

   Resurface cylinder head if necessary
   If cylinder head surface warpage exceeds specification or shows imperfections, have cylinder head deck resurfaced at machine shop. Maximum material removal is typically 0.008 inches total from original height. After resurfacing, thoroughly clean all surfaces to remove metal particles and cutting fluid.
   ⚠Excessive material removal from cylinder head will affect compression ratio and valve timing. Follow manufacturer service limits.
10. 10

    Install new valve stem seals and reassemble valves
    Lightly oil valve stems with clean engine oil. Install new valve stem seals onto valve guides using proper seal installation tool - tap gently until fully seated. Insert valves into guides from combustion chamber side. Install valve spring (with closer-wound coils toward head), spring retainer, and compress spring. Install valve keepers in valve stem groove ensuring they seat fully. Slowly release spring compressor and verify keepers are properly locked. Tap valve stem tip gently with plastic hammer to ensure keepers are seated. Repeat for all 16 valves.
    ⚠Valve stem seals must be installed squarely without cocking. Use proper driver tool to prevent damage.
11. 11

    Install cylinder head on engine block
    Verify engine block surface is perfectly clean and dry. Install new cylinder head gasket on block - do not use any sealant. Carefully lower cylinder head onto block, aligning dowel pins. Install new TTY cylinder head bolts with light oil on threads. Tighten in proper sequence from center outward. First pass: tighten all bolts to 30 Nm (22 lb-ft). Second pass: tighten all bolts to 65 Nm (48 lb-ft). Third pass: tighten each bolt an additional 90 degrees using angle gauge. Fourth pass: tighten each bolt another 90 degrees (total 180 degrees after torque).
    ⚠️Cylinder head bolts MUST be new TTY bolts. Sequence and angle tightening must be followed exactly to prevent gasket failure.
    Torque spec

    Cylinder Head Bolts65 Nm (48 lb-ft)
12. 12

    Install camshafts and timing components
    Apply clean engine oil to all camshaft journals and lobes. Install camshafts in correct positions (intake and exhaust marked). Install camshaft caps in original positions with arrows pointing toward timing chain end. Tighten camshaft cap bolts in sequence from center outward in multiple passes to final torque. Install timing chain onto camshaft sprockets, aligning marks made during disassembly. Hold camshafts on hex and install sprocket bolts to specification. Compress timing chain tensioner and install retention pin, then install tensioner assembly and remove pin.
    ⚠Verify timing marks align perfectly before final tensioner installation. Incorrect timing will damage engine.
    Torque spec

    Camshaft Cap Bolts14 Nm (10 lb-ft)

    Camshaft Sprocket Bolt80 Nm (59 lb-ft)

    Timing Chain Tensioner Bolt25 Nm (18 lb-ft)
13. 13

    Install timing cover and valve cover
    Clean all timing cover gasket surfaces. Install new timing cover gasket and position timing cover. Install 8mm timing cover bolts and tighten in proper sequence. Clean valve cover gasket surface and install new valve cover gasket and spark plug tube seals. Position valve cover and install bolts, tightening in sequence from center outward.
    Torque spec

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

    Reinstall exhaust and intake manifolds
    Install new exhaust manifold gasket. Apply anti-seize to exhaust manifold stud threads. Install exhaust manifold and tighten nuts to specification, working from hot center to cold outer bolts. Install new intake manifold gasket and position intake manifold. Tighten intake manifold bolts in crisscross pattern from center outward. Reconnect all vacuum lines, PCV hoses, and electrical connections per labels.
    ℹ️Anti-seize on exhaust studs prevents future seizure but do not over-apply as it can affect torque readings.
    Torque spec

    Exhaust Manifold Nuts30 Nm (22 lb-ft)

    Intake Manifold Bolts25 Nm (18 lb-ft)
15. 15

    Complete final assembly and fill fluids
    Install ignition coils and reconnect electrical connectors. Install new oil filter and fill engine with 4 quarts Honda Genuine 0W-20 oil. Fill cooling system with Honda Type 2 Blue coolant following proper bleeding procedure. Reconnect all remaining hoses, lines, and electrical connections. Reinstall engine covers and air intake system. Reconnect battery negative cable.
    ℹ️Cooling system must be properly bled to prevent air pockets which can cause overheating.

Reassembly

1. Double-check all electrical connectors are fully seated and locked
2. Verify all coolant hoses are properly clamped and no coolant leaks are present
3. Confirm all vacuum lines are connected per labeling
4. Ensure fuel lines are properly connected and secured with clips
5. Verify timing chain tensioner retention pin was removed

Verification

• Perform initial start and listen for abnormal noises - any valve ticking or timing chain noise indicates problem
• Allow engine to reach operating temperature and verify no coolant or oil leaks from head gasket area
• Monitor for white smoke from exhaust indicating valve seal or head gasket issues
• Check valve cover and timing cover areas for oil seepage
• Perform compression test on all cylinders - readings should be even within 10% and meet specification (typically 185-200 psi)
• Perform leak-down test to verify valve sealing quality - maximum 10% leak-down per cylinder
• Scan for diagnostic trouble codes related to camshaft position or timing
• Road test vehicle under various loads and verify smooth operation with no misfires or power loss
• After 500 miles, re-check valve cover and timing cover for any oil seepage and retorque if necessary

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