🔧 Accord - Timing Chain Replacement

Your Accord’s 2.4L engine uses a timing chain (metal chain), not a timing belt (rubber belt). Replacing the chain is a major job because the chain sits behind the side engine cover and requires precise engine timing to prevent severe engine damage.

Difficulty Level: Advanced | Estimated Time: 6-10 hours

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⚠️ Safety & Precautions

• ⚠️ Let the engine cool completely before working near the radiator/exhaust.
• ⚠️ Support the engine with a jack and wood block before removing the right-side engine mount.
• ⚠️ Do not rotate the crankshaft/camshafts independently once the chain is off; valves can contact pistons.
• ⚠️ Keep hands clear when lowering/raising the engine while aligning the mount.
• 🔋 Battery disconnect is recommended: remove the negative terminal to prevent accidental cranking.

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🔧 Required Tools

You'll need the following tools for this repair:

• Safety glasses
• Nitrile gloves
• Floor jack (rated 3-ton minimum)
• Jack stands (rated 3-ton minimum)
• Wheel chocks
• Wood block (2x6 in)
• 1/2" drive breaker bar
• 1/2" drive torque wrench (20-250 ft-lbs)
• 3/8" drive torque wrench (5-80 ft-lbs)
• 3/8" drive ratchet
• 1/2" drive ratchet
• Socket set 8mm-19mm (3/8" drive)
• Socket set 10mm-22mm (1/2" drive)
• 6-point 19mm socket (1/2" drive)
• 22mm socket (1/2" drive)
• Wobble extension set (3/8" drive)
• Extension set 3" / 6" / 10" (3/8" drive)
• Extension set 3" / 6" (1/2" drive)
• Universal joint adapter (3/8" drive)
• Phillips screwdriver #2
• Flat trim clip tool
• Serpentine belt tool (specialty)
• Honda/ball joint separator or tie-rod puller (specialty)
• Crank pulley holder tool (Honda) (specialty)
• Harmonic balancer puller (specialty)
• Plastic razor scraper
• Brake cleaner spray
• Drain pan (at least 2-gallon)
• Funnel
• Paint marker

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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 guides - Qty: 1 set
• Front timing cover gasket set - Qty: 1
• Valve cover gasket set - Qty: 1
• Crankshaft front oil seal - Qty: 1
• Engine coolant (Honda-type compatible) - Qty: 1-2 gallons
• RTV silicone sealant (Honda-spec) - Qty: 1
• Serpentine belt - Qty: 1
• Engine oil (0W-20 full synthetic) - Qty: 5 quarts
• Oil filter - Qty: 1

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📋 Before You Begin

• 🅿️ Park on level ground, set the parking brake, and chock the rear wheels.
• 🔋 Disconnect the negative battery cable using a 10mm socket.
• 🛠️ Raise the front of the car using a floor jack and support it on jack stands under the proper front jacking points.
• 🧰 Remove the right front wheel using a 19mm socket.
• 🧼 Plan to do an oil change after resealing the timing cover; oil can get contaminated during this job.
• Take photos before removing brackets and bolts.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Remove the right-side splash shields

• Use a flat trim clip tool and Phillips screwdriver #2 to remove the fender liner and lower splash shield fasteners.
• Pull the shields out to expose the crank pulley area.

Step 2: Drain coolant and engine oil

• Place a drain pan under the radiator and open the drain cock carefully.
• Drain engine oil into a drain pan and remove the oil filter with a socket set 8mm-19mm as needed for the drain plug.
• Use a funnel later for refilling.

Step 3: Remove the serpentine belt

• Use a serpentine belt tool to rotate the belt tensioner and slide the belt off the pulleys.
• Sketch the belt routing before removal.

Step 4: Support the engine

• Place a floor jack under the oil pan with a wood block (2x6 in) between the jack and pan.
• Raise just enough to hold the engine’s weight (do not lift the car off the stands).

Step 5: Remove the right engine mount and brackets

• Use a socket set 10mm-22mm (1/2" drive) and 3/8" drive ratchet to remove the mount bolts and bracket fasteners.
• Keep bolts grouped by location; lengths vary.
• Reinstall later and torque to Honda service manual specification for your mount/bracket hardware.

Step 6: Remove the valve cover

• Use a 10mm socket to remove valve cover nuts/bolts.
• Lift off the valve cover; remove the old gasket.
• Clean sealing surfaces using a plastic razor scraper and brake cleaner spray.

Step 7: Set cylinder #1 to Top Dead Center (TDC)

• Use a 22mm socket with a 1/2" drive breaker bar on the crankshaft bolt to rotate the engine clockwise.
• Align timing marks so #1 is at TDC on the compression stroke (cam lobes for #1 generally point away from each other).
• Use a paint marker to mark chain-to-sprocket positions as a reference.

Step 8: Remove the crank pulley (harmonic balancer)

• Hold the pulley using a crank pulley holder tool (Honda) (specialty).
• Use a 19mm 6-point socket with a 1/2" drive breaker bar to loosen the crank bolt.
• Use a harmonic balancer puller to remove the pulley if it’s stuck.

Step 9: Remove the front timing cover

• Remove all timing cover bolts using a socket set 8mm-19mm (3/8" drive) with extensions and a universal joint adapter as needed.
• Carefully pry the cover free without gouging the aluminum using a plastic razor scraper.
• Clean old RTV from both mating surfaces using a plastic razor scraper and brake cleaner spray.

Step 10: Release and remove the timing chain tensioner

• Remove the tensioner bolts using a 10mm socket.
• Remove the tensioner and set aside.
• Replace the tensioner; do not reuse if worn or sticking.

Step 11: Remove the timing chain guides and chain

• Remove guide bolts using a 10mm socket.
• Lift out the guides, then remove the chain from the cam and crank sprockets.
• Do not move the crank or cams now.

Step 12: Install new guides, chain, and align timing marks

• Install new guides using a 10mm socket.
• Fit the new chain over the crank sprocket and cam sprockets, aligning the colored links with the timing marks on the sprockets.
• Snug guide bolts with a 3/8" drive ratchet, then torque to Honda service manual specification for your guide bolts.

Step 13: Install and set the new chain tensioner

• Install the new tensioner using a 10mm socket.
• Set the tensioner per its pin/lock mechanism (many are shipped pinned; remove the pin after bolting it in place).
• Torque to Honda service manual specification for your tensioner bolts.

Step 14: Verify timing by hand-rotating the engine

• Use a 22mm socket and 1/2" drive breaker bar to rotate the crankshaft clockwise two full turns.
• Re-check that timing marks line up correctly at TDC.
• If marks do not align, stop and correct before reassembly.

Step 15: Reseal and install the timing cover

• Install a new crankshaft front oil seal into the timing cover if applicable, using an appropriately sized socket from the socket set 10mm-22mm as a driver.
• Apply RTV silicone sealant (Honda-spec) in the correct bead locations and install the cover.
• Install bolts finger-tight, then tighten in a crisscross pattern using a 3/8" drive torque wrench.
• Torque to Honda service manual specification for your timing cover bolts.

Step 16: Reinstall crank pulley and crank bolt

• Reinstall the pulley, then hold it with the crank pulley holder tool (Honda) (specialty).
• Tighten the crank bolt using a 19mm 6-point socket and 1/2" drive torque wrench.
• Torque to Honda service manual specification for your crankshaft pulley bolt.

Step 17: Reinstall valve cover with new gasket

• Install the new valve cover gasket and place the valve cover.
• Tighten fasteners evenly using a 10mm socket and finish with a 3/8" drive torque wrench.
• Torque to Honda service manual specification for your valve cover fasteners.

Step 18: Reinstall engine mount, belt, shields, and wheel

• Reinstall mount/brackets using a socket set 10mm-22mm (1/2" drive), adjusting jack height to align bolt holes.
• Install the serpentine belt using a serpentine belt tool.
• Reinstall splash shields using a flat trim clip tool and Phillips screwdriver #2.
• Install the wheel using a 19mm socket and 1/2" drive torque wrench and torque to 108 Nm (80 ft-lbs).

Step 19: Refill fluids

• Refill engine oil using a funnel with 0W-20 full synthetic.
• Install a new oil filter hand-tight, then snug per filter instructions.
• Refill coolant using a funnel and bleed air per Honda procedure (top off after the thermostat opens and heat blows hot).

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✅ After Repair

• 🔍 Start the engine and listen for abnormal rattling; a brief oil-pressure rattle is not normal if it continues.
• 🧯 Check for oil leaks at the timing cover, valve cover, and crank seal area.
• 🌡️ Bring the engine to operating temperature and verify the heater blows hot; re-check coolant level after it cools.
• 🛠️ Recheck oil level after a short test drive.
• 📟 If a check engine light appears, scan for codes before driving further.

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💰 DIY vs Shop Cost

Shop Cost: $1,200-$2,200 (parts + labor)

DIY Cost: $250-$650 (parts only)

You Save: $550-$1,950 by doing it yourself!

Shop labor rates vary but typically run $100-$150/hour. This repair takes a shop approximately 6-10 hours.

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🎯 Ready to get started?

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