🔧 Highlander - Timing Belt Check

Your Highlander does not use a timing belt. The 2.7L inline-4 engine uses a timing chain, which is designed to last much longer and is not replaced at normal timing-belt service intervals.

If you are hearing chain rattle, have cam/crank correlation trouble codes, or oil sludge concerns, the repair becomes a timing chain diagnosis or timing chain replacement, which is a more advanced engine repair.

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

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⚠️ Safety & Precautions

• ⚠️ Do not remove timing components unless the engine is set to top dead center, meaning cylinder #1 is positioned for correct timing alignment.
• ⚠️ Incorrect timing chain installation can cause engine damage or a no-start condition.
• ⚠️ Disconnect the negative battery cable before removing engine covers or working near the starter circuit.
• ⚠️ Support the engine correctly before removing any engine mount parts.
• ⚠️ Let the engine cool fully before draining coolant or working near the exhaust side of 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
• 3/8-inch ratchet
• 1/2-inch breaker bar
• Torque wrench 10-150 ft-lbs
• Crankshaft pulley holding tool (specialty)
• Harmonic balancer puller (specialty)
• Engine support bar 1,000-lb rated (specialty)
• Floor jack 3-ton minimum
• Jack stands 3-ton minimum
• Plastic trim clip remover
• Gasket scraper plastic
• Drain pan 2-gallon minimum
• Paint marker white
• Feeler gauge set
• Shop towels
• Nitrile gloves
• Safety glasses

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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
• Front timing cover sealant - Qty: 1
• Crankshaft front oil seal - Qty: 1
• Valve cover gasket - Qty: 1
• Engine oil 0W-20 synthetic - Qty: 5 quarts
• Oil filter - Qty: 1
• Toyota-compatible coolant - Qty: As needed

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📋 Before You Begin

• Park your Highlander on level ground and set the parking brake.
• Let the engine cool completely before starting.
• Disconnect the negative battery cable using a 10mm socket.
• Raise the front of the vehicle with a 3-ton floor jack and support it with 3-ton jack stands.
• Use a drain pan 2-gallon minimum under the engine before draining coolant or removing covers.
• Have a clean work area ready. Timing parts must stay clean.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Confirm This Is a Timing Chain Repair

• There is no timing belt to replace on your Highlander.
• The timing chain sits inside the engine behind the front timing cover.
• A timing chain is a metal chain that keeps the crankshaft and camshafts turning in sync.
• If your goal was routine maintenance, stop here. Routine timing belt replacement does not apply to this engine.

Step 2: Disconnect the Battery

• Use a 10mm socket to loosen the negative battery terminal.
• Move the cable away from the battery post so it cannot spring back into contact.
• Protects electronics while working.

Step 3: Raise and Support the Front

• Use a 3-ton floor jack to lift the front of your Highlander at the proper front jack point.
• Place 3-ton jack stands under the approved support points.
• Gently lower the vehicle onto the stands.
• Keep the floor jack nearby as a backup, but do not rely on it alone.

Step 4: Remove Engine Covers and Splash Shield

• Use a 10mm socket and plastic trim clip remover to remove the lower splash shield fasteners.
• Remove the top engine appearance cover by lifting it straight up by hand.
• Set all clips and bolts in labeled containers.

Step 5: Drain Coolant and Engine Oil

• Place a 2-gallon drain pan under the radiator drain area.
• Use gloved hands and open the radiator drain carefully if equipped.
• Place the drain pan under the oil pan.
• Use a 14mm socket to remove the engine oil drain plug.
• Reinstall the oil drain plug after draining and tighten with a 14mm socket.
• Torque to 40 Nm (30 ft-lbs).

Step 6: Remove Accessory Drive Belt

• Use a 14mm socket on the belt tensioner to relieve belt tension.
• A belt tensioner is a spring-loaded pulley that keeps the belt tight.
• Slide the belt off the pulleys and remove it from the engine bay.
• Take a photo first if you are not replacing the belt.

Step 7: Support the Engine

• Install an engine support bar 1,000-lb rated across the upper engine bay.
• Attach it to a safe engine lifting point.
• Lightly tension the support bar so it holds the engine weight.
• An engine support bar safely holds the engine when a mount is removed.

Step 8: Remove Right-Side Engine Mount Components

• Use 14mm socket and 17mm socket to remove the right-side engine mount bracket bolts as needed for timing cover access.
• Keep the mount bolts organized by location.
• Do not force the engine to move with a pry bar.

Step 9: Remove Crankshaft Pulley

• Install the crankshaft pulley holding tool to keep the pulley from turning.
• Use a 21mm socket and 1/2-inch breaker bar to loosen the crankshaft pulley bolt.
• Use a harmonic balancer puller to remove the pulley evenly.
• A harmonic balancer puller removes the crank pulley without damaging it.

Step 10: Remove Valve Cover

• Use a 10mm socket to remove ignition coil and valve cover fasteners.
• Lift the valve cover gently.
• Use a plastic gasket scraper only if the gasket sticks.
• Do not gouge the aluminum sealing surface.

Step 11: Set Engine to Top Dead Center

• Use a 21mm socket on the crankshaft bolt area to rotate the engine clockwise only.
• Align the crankshaft and camshaft timing marks to top dead center.
• Top dead center means cylinder #1 is at the top of its compression stroke.
• Use a white paint marker to highlight factory timing marks before removing anything.
• Take photos before disassembly.

Step 12: Remove Front Timing Cover

• Use 10mm socket, 12mm socket, and 14mm socket to remove front timing cover bolts.
• Note bolt lengths and locations carefully.
• Use a plastic gasket scraper to gently separate the cover at the sealant joint.
• Do not pry against machined sealing surfaces.

Step 13: Remove Timing Chain Tensioner and Guides

• Use a 10mm socket to remove the timing chain tensioner.
• The tensioner is the part that keeps the timing chain tight.
• Use a 10mm socket and 12mm socket to remove the timing chain guides.
• Keep hands clear of the chain path as tension is released.

Step 14: Remove Timing Chain

• Use your hands to lift the chain off the camshaft and crankshaft sprockets.
• Do not rotate the crankshaft or camshafts after the chain is removed.
• If anything moves, stop and realign the timing marks before continuing.

Step 15: Install New Timing Chain

• Match the colored chain links to the crankshaft and camshaft timing marks.
• Use the white paint marker marks you made earlier as a visual check.
• Install the chain carefully over the sprockets without forcing it.
• Install the new guides using 10mm socket and 12mm socket.
• Tighten guide fasteners to the service specification supplied with the kit if provided.

Step 16: Install Timing Chain Tensioner

• Install the new timing chain tensioner using a 10mm socket.
• Release the tensioner pin only after the chain and guides are correctly positioned.
• Check that the chain is tight on the correct side and the timing marks still align.

Step 17: Rotate Engine by Hand

• Use a 21mm socket to rotate the crankshaft clockwise two full turns.
• Stop if you feel hard resistance.
• Recheck timing mark alignment after rotation.
• This confirms the pistons and valves are not contacting each other.

Step 18: Reseal Front Timing Cover

• Clean old sealant with a plastic gasket scraper and shop towels.
• Apply front timing cover sealant in the correct bead pattern around the cover.
• Install the timing cover using 10mm socket, 12mm socket, and 14mm socket.
• Tighten bolts evenly in stages.
• Follow the sealant working time listed on the tube.

Step 19: Install Crankshaft Front Oil Seal and Pulley

• Install the new crankshaft front oil seal squarely into the cover.
• Slide the crankshaft pulley into place by hand.
• Use the crankshaft pulley holding tool, 21mm socket, and torque wrench 10-150 ft-lbs to tighten the crankshaft pulley bolt.
• Use the current Toyota service specification for final crank bolt torque and angle.

Step 20: Reinstall Valve Cover

• Install the new valve cover gasket into the valve cover groove.
• Set the valve cover onto the cylinder head without pinching the gasket.
• Use a 10mm socket to install the valve cover bolts.
• Tighten evenly from the center outward.

Step 21: Reinstall Engine Mount and Belt

• Use 14mm socket and 17mm socket to reinstall the right-side engine mount components.
• Remove the engine support bar 1,000-lb rated only after the mount is fully secured.
• Use a 14mm socket on the tensioner and reinstall the accessory drive belt.
• Check that the belt ribs sit correctly in every pulley groove.

Step 22: Refill Oil and Coolant

• Install a new oil filter by hand until snug, then tighten per filter instructions.
• Add 0W-20 synthetic engine oil.
• Refill the cooling system with Toyota-compatible coolant.
• Use shop towels to wipe spilled oil or coolant before starting.

Step 23: Reconnect Battery and Start Engine

• Use a 10mm socket to reconnect the negative battery cable.
• Start the engine and let it idle.
• Listen for abnormal rattling, knocking, or grinding.
• Shut the engine off immediately if it runs rough or makes loud chain noise.

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✅ After Repair

• ✅ Check for oil leaks around the timing cover and valve cover.
• ✅ Check for coolant leaks after the engine reaches operating temperature.
• ✅ Verify the coolant level again after the engine cools.
• ✅ Recheck engine oil level with the dipstick and top off if needed.
• ✅ Clear any stored trouble codes with a scan tool if timing-related codes were present before repair.
• ✅ Road test gently for 10-15 minutes, then inspect again for leaks.

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💰 DIY vs Shop Cost

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

DIY Cost: $350-$800 (parts only)

You Save: $1,000-$2,400 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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🎯 Ready to get started?

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