How to Replace the Timing Chain on a 2007 Nissan Altima 2.5L (Not a Timing Belt)
Step-by-step timing chain kit install with tools list, torque specs, TDC timing marks, and safety tips for 2007, 2008, 2009
How to Replace the Timing Chain on a 2007 Nissan Altima 2.5L (Not a Timing Belt)
Step-by-step timing chain kit install with tools list, torque specs, TDC timing marks, and safety tips for 2007, 2008, 2009
🔧 Altima - Timing Chain Replacement
Your Altima’s 2.5L engine uses a timing chain, not a timing belt. The chain synchronizes the crankshaft and camshafts; replacement is usually needed only for chain noise, stretched chain codes, or a failed tensioner/guide.
Difficulty Level: Advanced | Estimated Time: 6-10 hours
⚠️ Safety & Precautions
- ⚠️ Work on a cool engine; hot coolant and oil can burn you.
- ⚠️ Disconnect the negative battery cable before starting.
- ⚠️ Support the engine before removing the right-side engine mount.
- ⚠️ Keep fingers clear when rotating the engine by hand.
- ⚠️ Use jack stands; never rely on a floor jack alone.
🔧 Required Tools
You'll need the following tools for this repair:
- Safety glasses
- Nitrile gloves
- Floor jack (rated 2-ton minimum)
- Jack stands (rated 2-ton minimum)
- Wheel chocks
- Drain pan (at least 10-quart)
- Fender cover
- Metric socket set 8mm–19mm
- Deep socket 19mm
- Wrench set 10mm–19mm
- Ratchet 3/8"
- Ratchet 1/2"
- Breaker bar 1/2"
- Torque wrench 3/8" (5–80 Nm range)
- Torque wrench 1/2" (40–200 Nm range)
- Screwdriver set (Phillips #2, flathead)
- Pliers (needle-nose, slip-joint)
- Trim clip removal tool
- Serpentine belt tool or 14mm wrench
- Crankshaft pulley puller (specialty)
- Engine support bar (specialty)
- Gasket scraper
- Plastic razor blades
- Brake cleaner spray
- Shop rags
- Paint marker
- RTV sealant applicator gun
🔩 Required Parts
HowToo sells all the parts you need for this repair:
- Timing chain kit (primary chain, guides, tensioner) - Qty: 1
- Front timing cover sealant (RTV) - Qty: 1
- Valve cover gasket set - Qty: 1
- Front crankshaft seal - Qty: 1
- Engine coolant (compatible with Nissan coolant type) - Qty: 1-2 gallons
- Engine oil - Qty: 1 fill
- Oil filter - Qty: 1
- Serpentine belt - Qty: 1 (recommended)
📋 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 of the car with a floor jack and support it on jack stands.
- Remove the right-front wheel using a 19mm socket.
- Remove the right-side splash shield/fender liner clips using a trim clip removal tool.
- RTV is “liquid gasket” sealant that cures to seal.
🔨 Step-by-Step Instructions
Follow these steps in order:
Step 1: Drain coolant and prep the work area
- Place a drain pan under the radiator drain.
- Open the drain using a pliers (if needed) and drain coolant.
- Remove the radiator cap (engine cool) by hand to help it drain.
Step 2: Remove the intake duct and top engine items
- Loosen the intake duct clamps using a flathead screwdriver.
- Remove any covers/hoses blocking the valve cover using a 10mm socket and pliers.
Step 3: Remove the serpentine belt
- Relieve belt tension using a serpentine belt tool or 14mm wrench.
- Slip the belt off and set it aside.
Step 4: Support the engine and remove the right engine mount
- Install an engine support bar (specialty) to hold the engine from above.
- Remove the right engine mount fasteners using a socket set 14mm–19mm.
- Take photos before removing mount brackets.
Step 5: Remove the valve cover
- Unplug ignition coils and remove them using a 10mm socket.
- Remove valve cover bolts using a 10mm socket.
- Lift the valve cover off carefully; use a plastic razor blade if it’s stuck.
- On reassembly: Torque to 8.7 Nm (77 in-lb).
Step 6: Set the engine to Top Dead Center (TDC)
- Rotate the engine clockwise using a 19mm socket and breaker bar on the crank bolt.
- Align timing marks (cam sprocket marks to chain colored links, and crank mark to chain colored link).
- Mark your current alignment using a paint marker.
Step 7: Remove the crankshaft pulley
- Remove the crank bolt using a 19mm socket and breaker bar.
- Use a crankshaft pulley puller (specialty) to pull the pulley off straight.
- On reassembly: Torque to 157 Nm (116 ft-lb).
Step 8: Remove the front timing cover
- Remove front cover bolts using a socket set 10mm–14mm.
- Carefully separate the cover using a gasket scraper and plastic razor blades.
- Clean mating surfaces using brake cleaner spray and shop rags.
- Do not gouge aluminum sealing surfaces.
Step 9: Remove the timing chain tensioner and guides
- Remove the chain tensioner bolts using a 10mm socket.
- Remove chain guides using a 10mm socket.
- Note: a tensioner is a spring/oil-pressure device that keeps the chain tight.
- On reassembly (tensioner/guide bolts): Torque to 12 Nm (9 ft-lb).
Step 10: Remove and install the timing chain
- Remove the chain from the sprockets by hand once tension is released.
- Install the new chain, aligning the colored links to the crank and cam timing marks.
- If cam sprocket bolts must be loosened: use a socket set and breaker bar; on reassembly: Torque to 98 Nm (72 ft-lb).
Step 11: Reinstall tensioner and verify timing
- Install the guides using a 10mm socket and torque wrench.
- Install the tensioner using a 10mm socket and torque wrench.
- Pull the tensioner locking pin (if included) by hand to apply tension.
- Rotate the engine clockwise 2 full turns using a 19mm socket and breaker bar, then re-check timing alignment.
Step 12: Replace the front crankshaft seal
- Pry the old seal out carefully using a flathead screwdriver.
- Press the new seal in evenly (tap gently) using an appropriate socket as a driver.
Step 13: Reinstall the front cover with RTV
- Apply a continuous bead of front timing cover sealant (RTV) using an RTV sealant applicator gun.
- Install the cover and hand-start all bolts using a socket set 10mm–14mm.
- Tighten evenly using a torque wrench: Torque to 12 Nm (9 ft-lb) for small cover bolts.
Step 14: Reassemble and refill fluids
- Reinstall crank pulley and crank bolt using a 19mm socket and torque wrench: Torque to 157 Nm (116 ft-lb).
- Reinstall engine mount and brackets using a socket set 14mm–19mm; Torque to 74 Nm (55 ft-lb).
- Install valve cover with a new gasket using a 10mm socket and torque wrench: Torque to 8.7 Nm (77 in-lb).
- Reinstall coils using a 10mm socket: Torque to 10 Nm (7 ft-lb).
- Reinstall the serpentine belt using a serpentine belt tool or 14mm wrench.
- Refill coolant and engine oil using the correct fluids.
- Reconnect the battery using a 10mm socket.
✅ After Repair
- Start the engine and let it idle; listen for abnormal chain rattling.
- Check for coolant leaks and oil leaks around the front cover and valve cover.
- Top off coolant after the thermostat opens and air purges.
- Test drive, then recheck fluid levels after it cools.
💰 DIY vs Shop Cost
Shop Cost: $1,200-$2,200 (parts + labor)
DIY Cost: $250-$650 (parts only)
You Save: $950-$1,550 by doing it yourself!
Shop labor rates vary but typically run $100-$150/hour. This repair takes a shop approximately 6-10 hours.
🎯 Ready to get started?
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