🔧 Civic - Timing Chain Replacement

Your Civic uses a timing chain, not a timing belt. The timing chain keeps the crankshaft and camshafts synchronized so the valves and pistons move at the correct time. Replacing it is a major engine repair that requires precise cam/crank alignment and should only be done if diagnosis confirms chain stretch, guide failure, tensioner failure, or related timing faults.

Difficulty Level: Advanced | Estimated Time: 8-12 hours

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⚠️ Safety & Precautions

• ⚠️ Disconnect the negative battery cable before removing engine covers, wiring brackets, or the starter-area splash shields.
• ⚠️ Let the engine cool completely before draining coolant or working near the turbocharger and exhaust area.
• ⚠️ Support your Civic securely with jack stands. Never work under a vehicle held only by a floor jack.
• ⚠️ The right-side engine mount must be removed. The engine must be supported from below before removing it.
• ⚠️ Do not rotate the crankshaft or camshafts independently with the chain removed. Engine damage can occur.
• ⚠️ This engine is interference-style, meaning pistons and valves can contact each other if timing is incorrect.
• ⚠️ Use new sealant where required. Oil leaks are common if timing cover sealing surfaces are rushed or dirty.

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🔧 Required Tools

You'll need the following tools for this repair:

• 10mm socket
• 12mm socket
• 14mm socket
• 17mm socket
• 19mm socket
• 24mm socket
• 3/8-inch ratchet
• 1/2-inch breaker bar
• 3/8-inch extension set
• 1/2-inch extension set
• Torque wrench rated 5-80 Nm
• Torque wrench rated 40-250 Nm
• Crankshaft pulley holder tool (specialty)
• Crankshaft pulley removal tool (specialty)
• Engine support bar rated 500 lb minimum
• Floor jack rated 2-ton minimum
• Jack stands rated 2-ton minimum
• Wood block 12-inch minimum
• Trim clip removal tool
• Plastic scraper
• Razor scraper
• Brake cleaner aerosol
• Drain pan 10-quart minimum
• Coolant funnel kit
• Serpentine belt tool
• Paint marker
• Feeler gauge set
• Straightedge ruler
• Safety glasses
• Mechanic gloves

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🔩 Required Parts

HowToo sells all the parts you need for this repair:

• Timing chain - Qty: 1
• Timing chain tensioner - Qty: 1
• Timing chain guide set - Qty: 1
• Crankshaft front oil seal - Qty: 1
• Valve cover gasket set - Qty: 1
• Timing cover sealant - Qty: 1
• Engine oil (0W-20 full synthetic) - Qty: 5 quarts
• Engine oil filter - Qty: 1
• Honda-compatible premixed coolant - Qty: 1 gallon
• Serpentine belt - Qty: 1, recommended if worn
• Crankshaft pulley bolt - Qty: 1, recommended
• Engine mount bolts - Qty: As needed if stretched, damaged, or corroded

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📋 Before You Begin

• Park your Civic on level ground, set the parking brake, and chock the rear wheels.
• A timing chain is a metal chain inside the engine that keeps valve timing correct.
• A tensioner is a spring/oil-pressure device that keeps the timing chain tight.
• Top dead center, or TDC, means piston number 1 is at the top of its travel and timing marks are aligned.
• Plan for the vehicle to be down at least one full day. Cleanliness and timing alignment matter more than speed.
• Drain engine oil and coolant only after the engine is fully cool.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Disconnect the Battery

• Use a 10mm socket or 10mm wrench to loosen the negative battery terminal.
• Remove the negative cable and position it away from the battery post.
• Black cable comes off first.

Step 2: Raise and Support the Civic

• Use a floor jack rated 2-ton minimum at the front center jacking point.
• Place jack stands rated 2-ton minimum under the front support points.
• Lower the vehicle gently onto the stands and confirm it is stable.
• Wear safety glasses and mechanic gloves.

Step 3: Remove the Lower Splash Shield

• Use a trim clip removal tool to remove the plastic clips.
• Use a 10mm socket and 3/8-inch ratchet to remove the splash shield bolts.
• Lower the shield and set it aside.

Step 4: Drain Engine Oil and Coolant

• Place a drain pan 10-quart minimum under the engine oil drain plug.
• Use a 17mm socket and 3/8-inch ratchet to remove the oil drain plug.
• Drain the engine oil fully, then reinstall the drain plug with a new washer if available.
• Use a torque wrench rated 5-80 Nm to tighten the oil drain plug to Torque to 40 Nm (30 ft-lbs).
• Move the drain pan 10-quart minimum under the radiator drain area and drain coolant carefully.

Step 5: Remove the Engine Cover and Intake Ducting

• Lift the engine cover upward by hand from its rubber grommets.
• Use a 10mm socket to loosen intake duct fasteners and clamps as needed.
• Move the intake ducting aside to clear the top and front of the engine.

Step 6: Remove the Serpentine Belt

• Use a serpentine belt tool on the belt tensioner to relieve belt tension.
• Slide the belt off the pulleys and slowly release the tensioner.
• Use a paint marker to mark belt direction if reusing the belt.
• Replace the belt if cracked.

Step 7: Support the Engine

• Position an engine support bar rated 500 lb minimum across the upper body support points, or use a floor jack rated 2-ton minimum with a wood block 12-inch minimum under the oil pan.
• If using a jack, raise it only until it lightly supports the engine. Do not lift the vehicle by the oil pan.
• The wood block spreads the load so the oil pan is not dented.

Step 8: Remove the Right Engine Mount

• Use a 14mm socket and 17mm socket with a 3/8-inch ratchet to remove the right-side engine mount fasteners.
• Remove the mount bracket carefully once the engine is supported.
• Keep bolts organized by location.
• During installation, tighten the mount-to-body bolts to Torque to 54 Nm (40 ft-lbs).
• During installation, tighten the mount bracket bolts to Torque to 64 Nm (47 ft-lbs).

Step 9: Remove the Crankshaft Pulley

• Install the crankshaft pulley holder tool (specialty) into the pulley to keep it from turning.
• Use a 19mm socket, 1/2-inch breaker bar, and 1/2-inch extension set to loosen the crankshaft pulley bolt.
• If the pulley is stuck, use the crankshaft pulley removal tool (specialty) to remove it evenly.
• Do not hammer the pulley.

Step 10: Remove the Valve Cover

• Use a 10mm socket to remove ignition coil cover hardware if equipped.
• Use a 10mm socket to remove the ignition coil bolts and move the coils aside.
• Use a 10mm socket to remove valve cover bolts in a loose, even pattern.
• Lift the valve cover off carefully.
• Remove the old valve cover gasket set from the cover.

Step 11: Remove the Timing Cover

• Use 10mm socket, 12mm socket, and 14mm socket sizes as needed to remove timing cover bolts.
• Use a plastic scraper at the cover edges to gently separate the timing cover from the engine.
• Do not drive a metal screwdriver between sealing surfaces.
• Remove the timing cover and set it on a clean surface.

Step 12: Set Cylinder Number 1 to TDC

• Use a 19mm socket and 1/2-inch breaker bar on the crankshaft bolt area to rotate the engine clockwise only.
• Align the crankshaft timing mark with its reference mark.
• Confirm the camshaft timing marks line up with the cylinder head reference plane.
• Use a straightedge ruler to help visually confirm the cam marks are level.
• Use a paint marker to mark the current chain-to-sprocket positions before removal.

Step 13: Remove the Timing Chain Tensioner

• Use a 10mm socket to remove the timing chain tensioner bolts.
• Remove the timing chain tensioner from the engine.
• The chain may become loose after the tensioner is removed, so do not rotate the engine.

Step 14: Remove the Timing Chain Guides and Chain

• Use a 10mm socket and 12mm socket to remove the timing chain guide bolts.
• Remove the fixed and movable guides.
• Lift the timing chain off the camshaft sprockets and crankshaft sprocket.
• Do not rotate the camshafts or crankshaft with the chain removed.

Step 15: Install the New Timing Chain and Guides

• Position the new timing chain with its colored links aligned to the crankshaft and camshaft timing marks.
• Install the new timing chain guide set.
• Use a torque wrench rated 5-80 Nm to tighten guide bolts to Torque to 12 Nm (9 ft-lbs), unless the included guide kit specifies otherwise.
• Confirm the chain is seated fully on all sprockets.

Step 16: Install the New Timing Chain Tensioner

• Install the new timing chain tensioner in its compressed/locked position.
• Use a 10mm socket to install the tensioner bolts by hand first.
• Use a torque wrench rated 5-80 Nm to tighten the tensioner bolts to Torque to 12 Nm (9 ft-lbs).
• Release the tensioner lock so it applies pressure to the chain guide.

Step 17: Verify Timing by Hand

• Use a 19mm socket and 1/2-inch breaker bar to rotate the crankshaft clockwise two full turns.
• Stop at TDC again and recheck camshaft and crankshaft timing marks.
• If marks do not align, remove the tensioner and reset the chain. Do not start the engine.
• Use a feeler gauge set only if checking related valve clearance during this service.
• Hand-rotate before starting.

Step 18: Clean Timing Cover Sealing Surfaces

• Use a plastic scraper to remove old sealant from the timing cover and engine block.
• Use a razor scraper carefully only on stubborn flat metal areas.
• Use brake cleaner aerosol on a clean rag to wipe sealing surfaces dry.
• Do not let old sealant fall into the engine.

Step 19: Install the Front Crankshaft Seal

• Remove the old crankshaft front oil seal from the timing cover carefully.
• Press the new seal in squarely using an appropriate flat driver or seal installer if available.
• Lightly oil the seal lip with clean engine oil before installation.

Step 20: Reinstall the Timing Cover

• Apply timing cover sealant in a continuous bead following the original sealing path.
• Install the timing cover within the sealant working time.
• Use 10mm socket, 12mm socket, and 14mm socket sizes to install bolts by hand first.
• Use a torque wrench rated 5-80 Nm to tighten small timing cover bolts to Torque to 12 Nm (9 ft-lbs).
• Use a torque wrench rated 5-80 Nm to tighten larger timing cover bolts to Torque to 24 Nm (18 ft-lbs).

Step 21: Reinstall the Valve Cover

• Install the new valve cover gasket set into the valve cover grooves.
• Place the valve cover onto the cylinder head without pinching the gasket.
• Use a 10mm socket to install bolts by hand first.
• Use a torque wrench rated 5-80 Nm to tighten valve cover bolts to Torque to 10 Nm (7 ft-lbs).

Step 22: Reinstall the Crankshaft Pulley

• Slide the crankshaft pulley onto the crankshaft nose by hand.
• Install the crankshaft pulley bolt.
• Use the crankshaft pulley holder tool (specialty) to hold the pulley.
• Use a 19mm socket and torque wrench rated 40-250 Nm to tighten the crankshaft pulley bolt to Torque to 245 Nm (181 ft-lbs).

Step 23: Reinstall the Right Engine Mount

• Position the engine mount and bracket by hand.
• Use a 14mm socket and 17mm socket to start all mount bolts before tightening.
• Use a torque wrench rated 40-250 Nm to tighten mount-to-body bolts to Torque to 54 Nm (40 ft-lbs).
• Use a torque wrench rated 40-250 Nm to tighten mount bracket bolts to Torque to 64 Nm (47 ft-lbs).
• Remove the engine support bar rated 500 lb minimum or lower the floor jack rated 2-ton minimum slowly.

Step 24: Reinstall the Serpentine Belt

• Route the serpentine belt around the pulleys following the under-hood belt routing diagram.
• Use the serpentine belt tool to move the tensioner.
• Slide the belt onto the last pulley and slowly release the tensioner.
• Check that the belt ribs sit fully in every pulley groove.

Step 25: Refill Oil and Coolant

• Install the new engine oil filter by hand until the gasket touches, then tighten another 3/4 turn.
• Add engine oil (0W-20 full synthetic) through the oil fill cap.
• Use a coolant funnel kit to refill with Honda-compatible premixed coolant.
• Check for leaks before starting.

Step 26: Reconnect the Battery

• Use a 10mm socket or 10mm wrench to reconnect the negative battery terminal.
• Tighten the terminal until secure, but do not crush it.

Step 27: First Start

• Before starting, crank the engine briefly and listen for abnormal clanking or binding.
• Start the engine and let it idle.
• Watch the oil pressure warning light. Shut the engine off if it does not go out quickly.
• Check the timing cover, valve cover, oil drain plug, oil filter, and coolant areas for leaks.

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✅ After Repair

• Let the engine reach operating temperature while monitoring coolant level in the funnel.
• Turn the heater to warm and confirm heat output after the coolant begins circulating.
• Shut the engine off, let it cool, and top off coolant if needed.
• Check engine oil level with the dipstick and top off as needed.
• Scan for engine codes if the check engine light appears.
• Recheck for oil or coolant leaks after the first short drive.
• Reset the Maintenance Minder oil life if oil was changed: Home > Settings > Vehicle > Maintenance Info > Oil Life > Reset.

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💰 DIY vs Shop Cost

Shop Cost: $1,800-$3,200 (parts + labor)

DIY Cost: $350-$900 (parts only)

You Save: $1,450-$2,300 by doing it yourself!

Shop labor rates vary but typically run $100-$150/hour. This repair takes a shop approximately 8-12 hours.

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