🔧 Frontier - Timing Chain Replacement (No Timing Belt)

Your Frontier’s 4.0L V6 uses a timing chain, not a timing belt—so there’s no belt to replace. If you’re chasing rattling on cold start, a check engine light for cam/crank timing, or high mileage wear, the correct repair is servicing the timing chains, guides, and tensioners.

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

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⚠️ Safety & Precautions

• ⚠️ Work on a cold engine; hot coolant can burn you.
• ⚠️ Disconnect the negative battery cable before starting.
• ⚠️ Support the truck with jack stands; never rely on a jack.
• ⚠️ You’ll remove engine mounts/accessories; support the engine from below.
• ⚠️ Keep fingers clear when releasing belt tensioners and pry points.

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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)
• Drain pan (10-quart minimum)
• Funnel
• Shop towels
• Metric socket set 8mm-22mm
• Metric wrench set 8mm-22mm
• 3/8" drive ratchet
• 1/2" drive breaker bar
• 3/8" drive torque wrench (10-100 Nm range)
• 1/2" drive torque wrench (50-300 Nm range)
• Extensions set (3", 6", 12")
• Universal joint adapter
• Screwdriver set (Phillips #2, flathead)
• Pliers set
• Trim clip removal tool
• Serpentine belt tool 14mm
• Harmonic balancer puller kit (specialty)
• Crank pulley holding tool (specialty)
• Gasket scraper (plastic)
• Razor scraper
• Brake cleaner
• RTV sealant (engine timing cover rated)
• Paint marker

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🔩 Required Parts

HowToo sells all the parts you need for this repair:

• Timing chain kit (primary chain, secondary chains, guides, tensioners) - Qty: 1
• Front crankshaft seal - Qty: 1
• Front timing cover gasket set - Qty: 1
• Water pump gasket - Qty: 1
• Thermostat gasket - Qty: 1
• Serpentine drive belt - Qty: 1
• Engine oil (5W-30) - Qty: 6 quarts
• Oil filter - Qty: 1
• Engine coolant (Nissan-approved long-life) - Qty: 2-3 gallons
• RTV sealant (timing cover) - 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 at the frame.
• Place a drain pan under the radiator and drain the coolant.
• Take photos as you go. It helps a lot on reassembly.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Remove skid plates and splash shields

• Use a 12mm socket and trim clip removal tool to remove the undercovers.
• Set hardware in labeled containers (front, mid, rear).

Step 2: Drain coolant

• Place a drain pan under the radiator drain.
• Open the drain and remove the radiator cap to speed draining.

Step 3: Remove the intake ducting for access

• Use an 8mm socket or flathead screwdriver to loosen hose clamps.
• Disconnect ducting and move it aside.

Step 4: Remove the serpentine belt

• Use a serpentine belt tool 14mm to rotate the belt tensioner and slip the belt off.
• Serpentine tensioner = spring-loaded pulley arm.

Step 5: Remove the fan, shroud, and radiator (clear working room)

• Use a 10mm socket and pliers to remove the fan shroud fasteners and hose clamps.
• Disconnect upper/lower radiator hoses with pliers.
• Remove radiator mounting bolts using a 10mm socket and lift the radiator out carefully.

Step 6: Remove accessory components from the front of the engine

• Remove brackets and accessories blocking the timing cover using a 12mm socket and 14mm socket.
• If any wiring clips attach to the cover, release them using a trim clip removal tool.

Step 7: Support the engine (if mount/bracket removal is needed)

• Place a floor jack under the oil pan with a flat pad and lift lightly to support engine weight.
• Do not crush the oil pan. Lift only until it just supports.

Step 8: Remove the crankshaft pulley (harmonic balancer)

• Hold the crank pulley using a crank pulley holding tool (specialty).
• Remove the crank bolt using a 1/2" breaker bar and 22mm socket.
• Use a harmonic balancer puller kit (specialty) to pull the pulley straight off.
• On install: Torque the crank bolt to 236 Nm (174 ft-lbs).

Step 9: Remove valve covers (for timing alignment access)

• Remove ignition coils using a 10mm socket, then unplug connectors by hand.
• Remove valve cover bolts using a 10mm socket and lift covers off.
• Clean sealing surfaces with a plastic gasket scraper.

Step 10: Set cylinder #1 to TDC on compression

• Rotate the engine clockwise using a 22mm socket on the crank bolt (temporarily reinstall if needed).
• Align the timing marks per the chain kit instructions and mark them with a paint marker.
• TDC = piston at the top of its stroke.

Step 11: Remove the front timing cover

• Remove timing cover bolts using a 10mm socket and 12mm socket.
• Carefully break the RTV seal using a flathead screwdriver at approved pry points only.
• Clean old RTV using a razor scraper and brake cleaner.

Step 12: Remove timing chains, guides, and tensioners

• Relieve tensioner pressure and remove tensioners using a 10mm socket.
• Remove chain guides using a 10mm socket.
• Remove chains, keeping track of left/right orientation.

Step 13: Install new chains, guides, and tensioners

• Install new guides using a 10mm socket.
• Install new chains, matching colored links to the timing marks.
• Install new tensioners using a 10mm socket, then release the locking pins to apply tension.
• Double-check marks before releasing tensioners.

Step 14: Replace the front crank seal

• Pry out the old seal carefully using a flathead screwdriver.
• Press in the new seal evenly by hand, then seat it using a suitable driver from the harmonic balancer puller kit (specialty).

Step 15: Reinstall timing cover with RTV

• Apply a continuous bead of RTV sealant (engine timing cover rated) to the cover per the sealant pattern on the gasket kit.
• Install the cover and snug bolts evenly using a 10mm socket.
• Final tightening: use a 3/8" torque wrench and tighten fasteners to OEM spec (varies by bolt location/length).

Step 16: Reinstall crank pulley and accessories

• Install the crank pulley, hold it with the crank pulley holding tool (specialty), and torque the crank bolt with a 1/2" torque wrench.
• Torque the crank bolt to 236 Nm (174 ft-lbs).
• Reinstall accessories and brackets using 12mm socket and 14mm socket, tightening to OEM spec.

Step 17: Reinstall valve covers and ignition coils

• Install valve covers and tighten bolts evenly using a 10mm socket (final tighten with a 3/8" torque wrench to OEM spec).
• Reinstall coils using a 10mm socket and reconnect connectors by hand until they click.

Step 18: Reinstall radiator, hoses, fan/shroud, and belt

• Install radiator using a 10mm socket and reconnect hoses using pliers.
• Install the serpentine belt using a serpentine belt tool 14mm.

Step 19: Refill fluids (oil and coolant)

• Change the oil and filter using a drain pan and metric socket set.
• Refill engine with engine oil (5W-30) using a funnel.
• Refill coolant with Nissan-approved long-life coolant using a funnel.

Step 20: Reinstall undercovers and torque wheels (if removed)

• Reinstall skid plates using a 12mm socket.
• If wheels were removed: Torque lug nuts to 133 Nm (98 ft-lbs) using a 1/2" torque wrench.

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✅ After Repair

• Reconnect the battery using a 10mm socket.
• Start the engine and let it idle; listen for abnormal rattles at the front cover.
• Check for oil or coolant leaks around the timing cover and radiator hoses.
• Top off coolant after the engine warms up and the heater blows hot.
• After the first drive, recheck coolant level and look underneath for drips.

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💰 DIY vs Shop Cost

Shop Cost: $1,800-$3,500 (parts + labor)

DIY Cost: $350-$900 (parts only)

You Save: $1,450-$2,600 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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