🔧 Explorer - Water Pump Replacement

On your Explorer’s 3.5L V6, the water pump is driven by the timing chain and sits behind the front engine cover. Replacing it is a major job because the timing components and front cover must come off, and the engine timing must be held exactly in place to avoid engine damage.

Difficulty Level: Advanced | Estimated Time: 8-14 hours

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⚠️ Safety & Precautions

• ⚠️ Let the engine cool completely before opening the cooling system.
• ⚠️ Disconnect the negative battery cable to prevent accidental cranking.
• ⚠️ Support the engine before removing any engine mount (the engine can drop).
• ⚠️ If timing is set incorrectly, the engine may run poorly or be damaged.
• ⚠️ Use jack stands on solid level ground; never rely on a jack alone.

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🔧 Required Tools

You'll need the following tools for this repair:

• Floor jack (rated 3-ton minimum)
• Jack stands (rated 3-ton minimum)
• Wheel chocks
• Safety glasses
• Nitrile gloves
• Drain pan (at least 10-quart)
• Shop rags
• 3/8" drive ratchet
• 1/2" drive breaker bar
• Socket set 8mm-21mm
• Wrench set 8mm-21mm
• Torx bit set T20-T55
• Torque wrench 10-200 Nm
• Serpentine belt tool (specialty)
• Harmonic balancer puller (specialty)
• Harmonic balancer installer (specialty)
• Engine support bar (specialty)
• Ford 3.5L timing locking tool kit (specialty)
• Plastic gasket scraper
• Funnel

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🔩 Required Parts

HowToo sells all the parts you need for this repair:

• Water pump - Qty: 1
• Water pump gasket/O-ring - Qty: 1
• Front timing cover gasket set - Qty: 1
• RTV silicone sealant (engine-safe) - Qty: 1
• Engine coolant (Motorcraft Orange or equivalent OAT) - Qty: 3-4 gallons (mixed)
• Serpentine drive belt - Qty: 1
• Crankshaft pulley bolt (torque-to-yield) - Qty: 1
• Thermostat housing 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.
• Plan for downtime: if the timing cover sealing surfaces aren’t perfectly clean, it can leak.
• Tip: Take photos before every removal.
• Quick check (so I can tailor this): are you also replacing the timing chain/tensioners, or water pump only?
• Quick check: do you have access to a Ford 3.5L timing locking tool kit (specialty)?

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Drain the coolant

• Place a drain pan (at least 10-quart) under the radiator drain.
• Open the drain and remove the coolant reservoir cap to help it flow.
• Dispose of old coolant properly.

Step 2: Raise the front and remove the right front wheel

• Lift the front with a floor jack (rated 3-ton minimum) and support with jack stands (rated 3-ton minimum).
• Remove the wheel using a 19mm socket.
• Remove the right front inner fender liner fasteners using a socket set 8mm-21mm and Torx bit set T20-T55.

Step 3: Remove the intake ducting and upper access items

• Loosen intake clamps with a 8mm socket and remove the air inlet duct.
• Unclip any harness retainers carefully using a plastic gasket scraper (use it like a trim tool).

Step 4: Remove the serpentine belt

• Rotate the tensioner with a serpentine belt tool (specialty) and slide the belt off.
• If you’re reusing the belt, mark its rotation direction with a marker.

Step 5: Support the engine and remove the right engine mount

• Install the engine support bar (specialty) to hold the engine from above.
• Remove mount fasteners using a socket set 8mm-21mm.
• On reassembly: Torque to 85 Nm (63 ft-lbs) unless otherwise specified by the fastener size/position.

Step 6: Remove the crankshaft pulley (harmonic balancer)

• Remove the crank bolt using a 1/2" drive breaker bar and correct-size socket set 8mm-21mm.
• Pull the pulley using a harmonic balancer puller (specialty).
• Do not pry against the timing cover sealing surface.

Step 7: Set engine to timing position and lock it

• Rotate the crankshaft by hand using a socket set 8mm-21mm on the crank (clockwise only) to the correct timing position.
• Install the Ford 3.5L timing locking tool kit (specialty) to hold crank and cams in place (this prevents the chain from jumping).
• Tip: If it doesn’t slip in, don’t force it.

Step 8: Remove the front timing cover

• Remove front cover fasteners using a socket set 8mm-21mm and Torx bit set T20-T55.
• Break the seal carefully and remove the cover without gouging surfaces (use a plastic gasket scraper).
• On reassembly (typical): Torque M6 cover bolts to 10 Nm (89 in-lbs) and M8 cover bolts to 25 Nm (18 ft-lbs).

Step 9: Remove timing components needed to access the water pump

• Relieve tension using the appropriate fasteners with a socket set 8mm-21mm.
• Keep chain, guides, and bolts organized in order.
• On reassembly (typical): Torque timing chain guide bolts to 10 Nm (89 in-lbs) and tensioner bolts to 25 Nm (18 ft-lbs).

Step 10: Remove the water pump

• Remove water pump bolts using a socket set 8mm-21mm.
• Pull the pump out and expect more coolant to spill into the drain pan (at least 10-quart).
• Clean the mating surface gently using a plastic gasket scraper and shop rags until perfectly clean and dry.
• On reassembly (typical): Torque water pump bolts to 10 Nm (89 in-lbs).

Step 11: Install the new water pump

• Install the new gasket/O-ring and position the pump.
• Hand-start all bolts, then tighten evenly using a torque wrench 10-200 Nm.
• Torque to 10 Nm (89 in-lbs) unless your kit instructions specify otherwise.

Step 12: Reinstall timing components and verify timing

• Reinstall guides/tensioner using a socket set 8mm-21mm.
• Keep the locking tools installed until everything is torqued.
• Rotate the engine by hand two full turns using a socket set 8mm-21mm, then re-check that the locking tools still align correctly.

Step 13: Reinstall the front timing cover with proper sealing

• Install new timing cover seals/gaskets per the gasket set.
• Apply RTV silicone sealant (engine-safe) only at specified seam joints (typically where covers meet oil pan/head surfaces).
• Tighten bolts in a crisscross pattern using a torque wrench 10-200 Nm.
• Torque M6 cover bolts to 10 Nm (89 in-lbs) and M8 cover bolts to 25 Nm (18 ft-lbs).

Step 14: Reinstall crank pulley with a new crank bolt

• Install the pulley using a harmonic balancer installer (specialty) (don’t hammer it on).
• Install a new crank bolt and tighten using a torque wrench 10-200 Nm.
• Torque to 115 Nm (85 ft-lbs) + 90° (torque-to-yield).

Step 15: Reinstall engine mount, belt, liner, and wheel

• Reinstall the right engine mount and torque with a torque wrench 10-200 Nm: Torque to 85 Nm (63 ft-lbs).
• Install the belt using a serpentine belt tool (specialty) and confirm it’s seated in every pulley groove.
• Reinstall the fender liner using a Torx bit set T20-T55.
• Reinstall the wheel using a 19mm socket: Torque lug nuts to 135 Nm (100 ft-lbs).

Step 16: Refill and bleed the cooling system

• Refill with engine coolant (Motorcraft Orange or equivalent OAT) using a funnel.
• Start the engine and set heat to max; let it reach operating temperature.
• Top off as needed and check for leaks around the timing cover and water pump area.

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✅ After Repair

• Check coolant level again after the first full heat cycle and again the next morning.
• Inspect for oil leaks (timing cover seam) and coolant leaks (pump/cover area).
• Listen for abnormal chain noise; if present, shut down and re-check timing/tensioner.
• Road test 10-15 minutes, then re-check for leaks underneath.

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💰 DIY vs Shop Cost

Shop Cost: $1,500-$3,000 (parts + labor)

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

You Save: $1,250-$2,350 by doing it yourself!

Shop labor rates vary but typically run $100-$150/hour. This repair takes a shop approximately 8-14 hours.

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🎯 Ready to get started?

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