🔧 Tucson - Timing Chain Replacement

Your Tucson uses a timing chain, not a timing belt. The timing chain synchronizes the crankshaft and camshafts so the valves and pistons move at the correct time. This is a major engine repair that requires accurate timing alignment and careful sealing of the front timing cover.

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

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⚠️ Safety & Precautions

• ⚠️ This engine is an interference design, meaning incorrect timing can cause piston-to-valve contact and severe engine damage.
• ⚠️ Disconnect the negative battery cable before starting.
• ⚠️ Support the engine before removing the passenger-side engine mount.
• ⚠️ Never rotate the crankshaft or camshafts with the timing chain removed unless instructed and controlled.
• ⚠️ Work only on a completely cool engine.
• ⚠️ Keep sealant away from oil passages and timing components.
• ⚠️ If timing marks do not align exactly, stop and recheck before starting the engine.

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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
• 21mm socket
• E10 external Torx socket
• 3/8-inch ratchet
• 1/2-inch breaker bar
• 3/8-inch torque wrench
• 1/2-inch torque wrench
• Socket extension set
• Universal joint socket adapter
• Serpentine belt tool (specialty)
• Crankshaft pulley holding tool (specialty)
• Harmonic balancer puller (specialty)
• Engine support bar (specialty)
• Camshaft holding tool (specialty)
• Plastic scraper
• Gasket scraper
• Torque angle gauge (specialty)
• Oil drain pan
• Coolant drain pan
• Funnel
• Digital multimeter
• Floor jack (rated 2-ton minimum)
• Jack stands (rated 2-ton minimum)
• Wheel chocks
• Safety glasses
• Mechanic gloves

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🔩 Required Parts

HowToo sells all the parts you need for this repair:

• Timing chain kit - Qty: 1
• Timing chain tensioner - Qty: 1
• Timing chain guides - Qty: 1 set
• Crankshaft front seal - Qty: 1
• Valve cover gasket - Qty: 1
• Timing cover sealant - Qty: 1
• Engine oil (5W-30 synthetic) - Qty: 5 quarts
• Oil filter - Qty: 1
• Engine coolant - Qty: As needed
• Serpentine drive belt - Qty: 1
• Crankshaft pulley bolt - Qty: 1

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📋 Before You Begin

• Park your Tucson on level ground, shift to Park, and set the parking brake.
• Place wheel chocks behind the rear wheels.
• Disconnect the negative battery cable with a 10mm socket.
• Take photos of hose routing, wiring clips, and belt routing before removal.
• Raise the front with a floor jack and support it with jack stands.
• Drain engine oil into an oil drain pan.
• Drain coolant into a coolant drain pan if any coolant components block timing cover access.
• Support the engine with an engine support bar before removing the passenger-side engine mount.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Disconnect Power and Remove Covers

• Use a 10mm socket to disconnect the negative battery cable.
• Use a 10mm socket to remove the engine cover fasteners if equipped.
• Use a trim clip removal tool if plastic retainers are present.
• Set covers and clips aside in labeled containers.

Step 2: Remove Intake Ducting and Obstructions

• Use a flat-blade screwdriver to loosen intake hose clamps.
• Use a 10mm socket to remove air box or duct fasteners as needed.
• Use needle-nose pliers to release small hose clamps carefully.
• Move wiring harnesses aside without pulling on the wires.

Step 3: Raise and Support the Vehicle

• Use a floor jack to raise the front of your Tucson.
• Place jack stands under the front support points.
• Use a 10mm socket and trim clip removal tool to remove the lower splash shield.
• Shake gently to confirm stability.

Step 4: Remove the Serpentine Belt

• Use a 17mm socket with a 1/2-inch breaker bar or serpentine belt tool on the belt tensioner.
• Rotate the tensioner to remove belt tension.
• Slide the belt off the alternator pulley first.
• Slowly release the tensioner.
• Remove the belt from the engine bay.

Step 5: Support the Engine

• Install the engine support bar across the strut towers.
• Attach the support hook to the engine lift point.
• Take up light tension only. Do not lift the vehicle body.
• The engine support bar holds the engine after the mount is removed.

Step 6: Remove the Passenger-Side Engine Mount

• Use a 14mm socket and 17mm socket to remove the engine mount bracket fasteners.
• Use a 1/2-inch breaker bar if the bolts are tight.
• Remove the mount and bracket from the timing cover area.
• Keep bolts grouped by location.
• During installation, tighten engine mount fasteners to Torque to 65-85 Nm (48-63 ft-lbs).

Step 7: Remove the Valve Cover

• Use a 10mm socket to remove ignition coil fasteners if they block the valve cover.
• Use a 10mm socket to remove valve cover bolts.
• Lift the valve cover straight up.
• Use a plastic scraper to remove old gasket material from the sealing surface.
• Do not gouge the aluminum surface.

Step 8: Set Cylinder 1 to Top Dead Center

• Use a 21mm socket and 1/2-inch breaker bar on the crankshaft pulley bolt.
• Rotate the engine clockwise only.
• Align the crankshaft mark to top dead center. Top dead center means piston 1 is at the top of its compression stroke.
• Confirm the camshaft timing marks align with their reference marks.
• Turn clockwise only.

Step 9: Remove the Crankshaft Pulley

• Install the crankshaft pulley holding tool to prevent the pulley from turning.
• Use a 21mm socket and 1/2-inch breaker bar to loosen the crankshaft pulley bolt.
• Remove the bolt and washer.
• Use a harmonic balancer puller to remove the pulley if it does not slide off by hand.
• Replace the crankshaft pulley bolt during reassembly.

Step 10: Remove the Timing Cover

• Use a 10mm socket, 12mm socket, and E10 external Torx socket to remove timing cover fasteners.
• Note bolt lengths and locations before removal.
• Use a plastic scraper to carefully break the sealant bond.
• Remove the timing cover without prying against machined surfaces.
• Use a gasket scraper only where needed, keeping debris out of the engine.

Step 11: Verify Timing Marks Before Disassembly

• Use the 21mm socket to fine-adjust the crankshaft clockwise if needed.
• Confirm the crankshaft and camshaft timing marks still align.
• Mark the old chain and sprockets with a paint marker if available.
• If marks do not align, do not remove the chain until alignment is corrected.

Step 12: Remove the Timing Chain Tensioner and Guides

• Use a 10mm socket or 12mm socket to remove the timing chain tensioner bolts.
• Remove the tensioner. The tensioner pushes on a guide to keep the chain tight.
• Use a 10mm socket to remove the timing chain guide bolts.
• Remove the chain guides.
• Keep fingers clear because the chain may shift when tension is released.

Step 13: Remove the Timing Chain

• Hold the camshafts steady with a camshaft holding tool.
• Lift the timing chain off the camshaft sprockets and crankshaft sprocket.
• Do not rotate the camshafts or crankshaft after the chain is removed.
• Inspect sprocket teeth for sharp points, hooking, or damage.

Step 14: Install the New Timing Chain

• Match the colored links on the new timing chain to the timing marks on the crankshaft and camshaft sprockets.
• Use the camshaft holding tool to keep the camshafts steady.
• Install the chain over the crankshaft sprocket first, then over the camshaft sprockets.
• Confirm every colored link lines up exactly with its timing mark.
• Exact timing is critical.

Step 15: Install New Guides and Tensioner

• Install the new timing chain guides by hand.
• Use a 10mm socket and 3/8-inch torque wrench to tighten guide bolts to Torque to 9-12 Nm (80-106 in-lbs).
• Install the new tensioner with the retaining pin still installed.
• Use a 10mm socket or 12mm socket and 3/8-inch torque wrench to tighten tensioner bolts to Torque to 9-12 Nm (80-106 in-lbs).
• Pull the tensioner retaining pin only after the chain and guides are fully installed.

Step 16: Rotate Engine by Hand and Recheck Timing

• Use a 21mm socket and 1/2-inch breaker bar to rotate the crankshaft clockwise two full turns.
• Stop if you feel hard resistance.
• Return cylinder 1 to top dead center.
• Confirm camshaft and crankshaft timing marks align again.
• If marks are off, remove tension and reset the chain before continuing.

Step 17: Prepare and Seal the Timing Cover

• Use a plastic scraper and gasket scraper to clean old sealant from the timing cover and engine block.
• Wipe sealing surfaces clean and dry.
• Install a new crankshaft front seal into the timing cover if not preinstalled.
• Apply a continuous bead of timing cover sealant to the cover sealing surface.
• Use a thin, even bead.

Step 18: Reinstall the Timing Cover

• Place the timing cover onto the engine carefully without smearing the sealant.
• Start all bolts by hand.
• Use a 10mm socket, 12mm socket, and E10 external Torx socket to snug fasteners evenly.
• Use a 3/8-inch torque wrench to tighten small timing cover bolts to Torque to 9-12 Nm (80-106 in-lbs).
• Use a 3/8-inch torque wrench to tighten larger timing cover bolts to Torque to 18-25 Nm (13-18 ft-lbs).

Step 19: Reinstall the Crankshaft Pulley

• Slide the crankshaft pulley onto the crankshaft by hand.
• Install a new crankshaft pulley bolt.
• Hold the pulley with the crankshaft pulley holding tool.
• Use a 21mm socket, 1/2-inch torque wrench, and torque angle gauge to tighten the crankshaft pulley bolt to Torque to 49 Nm (36 ft-lbs) plus 90°.

Step 20: Reinstall the Valve Cover

• Install the new valve cover gasket into the valve cover groove.
• Place the valve cover onto the cylinder head.
• Start all bolts by hand.
• Use a 10mm socket and 3/8-inch torque wrench to tighten valve cover bolts to Torque to 8-10 Nm (71-89 in-lbs).

Step 21: Reinstall the Engine Mount

• Position the passenger-side engine mount and bracket.
• Start all bolts by hand.
• Use a 14mm socket, 17mm socket, and 1/2-inch torque wrench to tighten mount fasteners to Torque to 65-85 Nm (48-63 ft-lbs).
• Remove the engine support bar only after the mount is fully tightened.

Step 22: Reinstall Belt, Covers, Oil, and Coolant

• Install the new serpentine drive belt using the 17mm socket and serpentine belt tool to rotate the tensioner.
• Use a 10mm socket to reinstall the splash shield and upper covers.
• Install a new oil filter by hand.
• Use a funnel to refill the engine with engine oil.
• Use a funnel to refill engine coolant if drained.

Step 23: Reconnect the Battery and Initial Start

• Use a 10mm socket to reconnect the negative battery cable.
• Before starting, use a digital multimeter to confirm battery voltage is above 12 volts.
• Start the engine and let it idle.
• Listen for rattling, knocking, or chain slap.
• Shut the engine off immediately if loud mechanical noise occurs.

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✅ After Repair

• ✅ Check for oil leaks around the timing cover and valve cover.
• ✅ Check coolant level after the engine reaches operating temperature.
• ✅ Confirm the engine idles smoothly and the check engine light stays off.
• ✅ Recheck engine oil level after shutdown and a 5-minute wait.
• ✅ Reset the clock and radio presets if battery power was disconnected.
• ✅ If the power window auto function is lost, fully lower the window, fully raise it, then hold the switch up for 2-5 seconds.

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💰 DIY vs Shop Cost

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

DIY Cost: $350-$850 USD equivalent (parts only)

You Save: $1,200-$2,350 USD equivalent by doing it yourself!

Shop labor rates vary but typically run $100-$150/hour. This repair takes a shop approximately 7-10 hours.

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🎯 Ready to get started?

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