🔧 Ridgeline - Water Pump Replacement

On your Ridgeline’s 3.5L V6, the water pump is driven by the timing belt and sits behind the timing covers. Replacing it requires removing the timing belt, so it’s typically done together with a timing belt service to prevent repeat labor and future failures.

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

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⚠️ Safety & Precautions

• 🛑 Work on a cold engine; hot coolant can cause severe burns.
• 🛑 Support the engine before removing the right-side engine mount; do not rely on a jack alone.
• 🛑 Keep fingers/tools clear when releasing belt tensioners.
• 🛑 If you rotate the crankshaft, rotate clockwise only to avoid timing belt slack issues.
• 🔋 Battery disconnect is recommended before working near the starter/engine harness: disconnect negative terminal first.

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🔧 Required Tools

You'll need the following tools for this repair:

• Safety glasses
• Nitrile gloves
• Wheel chocks
• Floor jack (rated 3-ton minimum)
• Jack stands (rated 3-ton minimum)
• Block of wood for floor jack
• Drain pan (at least 2-gallon)
• Funnel
• Metric socket set (8mm-19mm)
• 3/8" drive ratchet
• 1/2" drive breaker bar
• Torque wrench (10-250 ft-lbs range)
• Serpentine belt tool or 14mm wrench
• Phillips screwdriver
• Flat trim clip remover
• Pliers
• Honda crank pulley holding tool (specialty)
• 19mm impact socket
• Gasket scraper or plastic razor blade
• Shop towels

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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 (as equipped) - Qty: 1
• Honda Type 2 coolant (pre-mixed) - Qty: 2-3 gallons
• Timing belt - Qty: 1 (Strongly recommended while you’re here)
• Timing belt tensioner - Qty: 1 (Strongly recommended)
• Timing belt idler pulley(s) - Qty: 1-2 (Strongly recommended)
• Serpentine belt - Qty: 1 (Recommended if worn/cracked)

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📋 Before You Begin

• Park on level ground, set the parking brake, and chock the rear wheels.
• Let the engine cool completely.
• Disconnect the negative battery terminal using a 10mm socket.
• Raise the front-right corner with a floor jack and support with jack stands.
• Remove the right-front wheel using a 19mm socket.
• Tip: Bag and label bolts by step.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Drain the coolant

• Place a drain pan under the radiator drain.
• Open the radiator cap (only if fully cool), then open the drain to drain coolant.
• If equipped with a splash shield blocking access, remove clips/bolts using a flat trim clip remover and 10mm socket.

Step 2: Remove the right inner fender liner / access covers

• Remove the right front inner fender liner fasteners using a flat trim clip remover and 10mm socket.
• This opens access to the crank pulley, side engine mount, and timing covers.

Step 3: Remove the serpentine belt

• Relieve tension on the belt tensioner using a serpentine belt tool or 14mm wrench.
• Slip the belt off and remove it from the engine bay.

Step 4: Support the engine and remove the right engine mount

• Place a floor jack with a block of wood under the oil pan and gently take the weight of the engine. (Do not lift hard—just support.)
• Remove the right-side engine mount and bracket fasteners using a metric socket set and ratchet.
• Tip: Take a photo before unbolting.

Step 5: Remove the crankshaft pulley

• Install the Honda crank pulley holding tool (specialty) to keep the pulley from turning.
• Remove the crank bolt using a 19mm impact socket and 1/2" breaker bar.
• Torque note (reinstall): Torque to 245 Nm (181 ft-lbs)

Step 6: Remove the timing belt covers

• Remove upper/middle/lower timing covers using a 10mm socket and ratchet.
• Keep bolts organized by cover location/length.

Step 7: Set cylinder #1 to TDC (timing marks aligned)

• Rotate the crankshaft clockwise using a 19mm socket and ratchet until the timing marks align.
• Confirm the cam pulley marks and the crank mark align with their references.
• Tip: Mis-timing can cause severe engine damage.

Step 8: Release the timing belt tension and remove the belt

• Remove the timing belt tensioner fasteners using a metric socket set and ratchet.
• Remove the timing belt from the pulleys carefully so the cam gears don’t jump.
• Torque note (reinstall tensioner): Torque to 45 Nm (33 ft-lbs)

Step 9: Remove the water pump

• Place a drain pan under the pump area for residual coolant.
• Remove water pump bolts using a 10mm socket and ratchet.
• Remove the pump from the engine.
• Torque note (reinstall pump bolts): Torque to 12 Nm (9 ft-lbs)

Step 10: Clean the mating surface and install the new pump

• Clean the engine mating surface using a gasket scraper or plastic razor blade and shop towels.
• Install the new gasket/O-ring on the new water pump.
• Install the water pump and hand-start bolts, then tighten evenly using a torque wrench.
• Torque to 12 Nm (9 ft-lbs)

Step 11: Reinstall timing components and timing belt

• If replacing idlers/tensioner, remove and install them now using a metric socket set and torque wrench.
• Route the timing belt in the correct direction, keeping the timing marks aligned.
• Reinstall the tensioner and set tension per the tensioner design (pull pin if it’s a pinned hydraulic tensioner).
• Rotate the engine clockwise by hand two full turns using a 19mm socket and ratchet, then re-check all timing marks.
• Tip: If marks don’t line up, stop and reset.

Step 12: Reassemble covers, crank pulley, mount, and belt

• Reinstall timing covers using a 10mm socket and ratchet.
• Reinstall the crank pulley and crank bolt using the Honda crank pulley holding tool (specialty), then tighten with a torque wrench.
• Torque to 245 Nm (181 ft-lbs)
• Reinstall the right engine mount/bracket using a metric socket set and torque wrench.
• Reinstall the serpentine belt using a serpentine belt tool or 14mm wrench.
• Reinstall the fender liner and wheel using a flat trim clip remover and 19mm socket.

Step 13: Refill and bleed the cooling system

• Close the radiator drain.
• Fill with Honda Type 2 coolant (pre-mixed) using a funnel.
• Start the engine and let it warm up with the heater set to HOT; watch the temperature gauge.
• Top off coolant as air purges. Shut off, cool down, then recheck the level and top off again.

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✅ After Repair

• Check for leaks around the water pump area and under the vehicle while idling.
• Verify the serpentine belt runs true (no wobble/no squeal).
• After the first test drive and full cool-down, recheck coolant level and top off if needed.
• If you hear ticking/rubbing from the timing cover area, shut down and re-inspect immediately.

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💰 DIY vs Shop Cost

Shop Cost: $900-$1,600 (parts + labor)

DIY Cost: $220-$650 (parts only)

You Save: $680-$950 by doing it yourself!

Shop labor rates vary but typically run $100-$150/hour. This repair takes a shop approximately 4-7 hours.

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🎯 Ready to get started?

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