🔧 Forester - Timing Belt Replacement

Your Forester’s turbo 2.5L uses a timing belt to keep the crankshaft and camshafts perfectly synchronized. Replacing it on schedule prevents severe engine damage if the belt, tensioner, or an idler bearing fails.

Difficulty Level: Advanced | Estimated Time: 4-7 hours

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⚠️ Safety & Precautions

• ⚠️ Work on a cold engine; hot coolant and turbo parts can burn you.
• ⚠️ Support the vehicle with jack stands; never rely on a jack.
• ⚠️ Do not rotate the crank or cams with the belt removed unless instructed; valve timing can slip.
• ⚠️ Keep fingers clear of the belt path when releasing the tensioner.
• ⚠️ Battery disconnect is recommended before starting.

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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
• 3/8" drive ratchet
• 1/2" drive breaker bar
• 1/2" drive torque wrench (20-200 ft-lbs)
• 3/8" drive torque wrench (in-lb or low ft-lb range)
• Socket set (8mm-22mm)
• 10mm socket
• 12mm socket
• 14mm socket
• 22mm socket
• Extensions (3" and 6")
• Phillips screwdriver
• Flat trim tool
• Serpentine belt tool or long 1/2" ratchet
• Crank pulley holding tool (specialty)
• Harmonic balancer puller (specialty)
• Pliers
• Drain pan (at least 2-gallon)
• Funnel
• Shop rags
• Paint marker

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🔩 Required Parts

HowToo sells all the parts you need for this repair:

• Timing belt - Qty: 1
• Timing belt hydraulic tensioner - Qty: 1
• Timing belt idler pulley set - Qty: 1
• Water pump with gasket/O-ring - Qty: 1
• Thermostat with gasket - Qty: 1
• Coolant (Subaru-compatible long-life) - Qty: 2 gallons
• Accessory drive belts - Qty: 2
• Radiator drain plug gasket - 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 and support it on jack stands.
• Remove the lower splash shield using a 10mm socket and a flat trim tool.
• Pro tip: Take photos before each removal step.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Remove the top-mounted intercooler

• Loosen the intercooler hose clamps with a Phillips screwdriver or 8mm socket (whichever your clamps use).
• Remove the intercooler mounting bolts with a 12mm socket.
• Lift the intercooler out carefully and set it aside.
• Pro tip: Cover open hoses with clean rags.

Step 2: Drain the coolant

• Place a drain pan (at least 2-gallon) under the radiator drain.
• Open the radiator drain using a pliers if needed and remove the radiator cap by hand.
• Let coolant fully drain, then close the drain.

Step 3: Remove the radiator fans for working room

• Unplug the fan connectors by hand.
• Remove fan bolts using a 10mm socket.
• Lift both fan assemblies straight up and out.

Step 4: Remove accessory (drive) belts

• Loosen the belt adjuster/lock hardware with the appropriate 12mm socket and 14mm socket.
• Back off tension until belts slip off the pulleys.
• Remove both belts and set aside (replacement is recommended).

Step 5: Remove the crank pulley (harmonic balancer)

• Install the crank pulley holding tool (specialty) to keep the crank from turning.
• Remove the crank bolt using a 22mm socket and 1/2" breaker bar.
• If the pulley is stuck, use a harmonic balancer puller (specialty) to remove it.
• Set the pulley aside.

Step 6: Remove the timing belt covers

• Remove the plastic timing covers using a 10mm socket with extensions (3" and 6").
• Keep bolts grouped by cover section so they go back in the same place.

Step 7: Set engine to timing marks (Top Dead Center reference)

• Turn the crank clockwise using a 22mm socket and 1/2" ratchet until the timing marks line up on the crank sprocket and both cam sprockets.
• Use a paint marker to add your own “extra” alignment marks on the sprockets and old belt.
• Pro tip: Only rotate clockwise to avoid slack issues.

Step 8: Remove the timing belt tensioner and old belt

• Remove the tensioner mounting bolts using a 12mm socket.
• Remove the belt carefully by hand, keeping an eye on cam sprockets so they don’t jump.
• Remove the idler pulleys using a 12mm socket.
• Install the new idlers and tighten to Torque to 39 Nm (29 ft-lbs).
• Pro tip: An idler is a guide pulley for the belt.

Step 9: Replace the water pump and thermostat (recommended while you’re here)

• Remove water pump bolts using a 10mm socket.
• Remove the pump and clean the mating surface with a shop rag.
• Install the new water pump with its gasket/O-ring and tighten bolts evenly to Torque to 10 Nm (7 ft-lbs).
• Replace the thermostat and gasket (typically in the water pump housing) using a 10mm socket, then tighten to Torque to 18 Nm (13 ft-lbs).

Step 10: Install the new timing belt

• Confirm crank and cam timing marks are still aligned (use your paint marker marks as a double-check).
• Route the new belt in the correct direction (follow belt arrows/marks if provided), keeping the belt tight on the non-tensioned side.
• Install the new hydraulic tensioner but do not pull the pin yet; tighten mounting bolts to Torque to 39 Nm (29 ft-lbs) using a 12mm socket and torque wrench.

Step 11: Tension the belt and verify timing

• Pull the tensioner retaining pin straight out by hand to apply belt tension.
• Rotate the engine clockwise two full turns using a 22mm socket and 1/2" ratchet.
• Re-check that all timing marks line up perfectly.
• If any mark is off, stop and correct it before reassembly.

Step 12: Reinstall timing covers and crank pulley

• Reinstall timing covers using a 10mm socket (snug; do not overtighten plastic covers).
• Reinstall the crank pulley.
• Install and tighten the crank bolt using a 22mm socket, crank pulley holding tool (specialty), and torque wrench to Torque to 177 Nm (130 ft-lbs).

Step 13: Reinstall accessory belts, fans, and intercooler

• Install new accessory belts and set tension using a 12mm socket and 14mm socket.
• Reinstall radiator fans using a 10mm socket and reconnect the electrical plugs.
• Reinstall the intercooler using a 12mm socket, then tighten hose clamps with a Phillips screwdriver or 8mm socket.

Step 14: Refill and bleed coolant

• Refill the radiator with coolant (Subaru-compatible long-life) using a funnel.
• Start the engine and let it warm up with the heater set to hot.
• Top off coolant as air burps out, then install the radiator cap.
• Fill the overflow bottle to the proper level.

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✅ After Repair

• Check for coolant leaks around the water pump and hoses.
• Listen for abnormal squeals/whines (a misrouted belt or bad idler will often make noise).
• Verify the engine idles smoothly and the check engine light stays off.
• After a full heat soak and cool down, re-check coolant level and top off if needed.

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💰 DIY vs Shop Cost

Shop Cost: $1,100-$1,800 (parts + labor)

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

You Save: $450-$1,550 by doing it yourself!

Shop labor rates vary but typically run $100-$150/hour. This repair takes a shop approximately 4-6 hours.

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🎯 Ready to get started?

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