🔧 Grand Cherokee - Timing Drive Inspection

Your Grand Cherokee with the 5.7L V8 does not use a timing belt. It uses an internal timing chain, which is designed to last much longer than a belt and is not a normal maintenance replacement item.

If you are chasing noise, timing codes, misfires, or cam/crank correlation faults, the correct repair is timing chain, guides, tensioner, and related gasket service—not a belt replacement.

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

---

⚠️ Safety & Precautions

• ⚠️ This is an advanced internal engine repair. Incorrect timing can cause severe engine damage.
• ⚠️ Let the engine cool fully before opening the cooling system or removing front engine parts.
• ⚠️ Disconnect the negative battery cable before starting.
• ⚠️ Support the vehicle securely with jack stands if raising the front end.
• ⚠️ Keep the timing marks aligned exactly. Do not rotate the crankshaft or camshaft independently once the chain is removed.
• ⚠️ The crankshaft bolt is very tight and may require high force to loosen.

---

🔧 Required Tools

You'll need the following tools for this repair:

• 3/8-inch drive ratchet
• 1/2-inch drive breaker bar
• 1/2-inch drive torque wrench
• 3/8-inch drive torque wrench
• 8mm socket
• 10mm socket
• 13mm socket
• 15mm socket
• 18mm socket
• 21mm socket
• 24mm socket
• Socket extension set
• Serpentine belt tool
• Harmonic balancer puller (specialty)
• Harmonic balancer installer (specialty)
• Camshaft holding tool (specialty)
• Crankshaft holding tool (specialty)
• Plastic trim clip removal tool
• Flat-blade screwdriver
• Gasket scraper plastic
• Drain pan 2-gallon minimum
• Floor jack rated 3-ton minimum
• Jack stands rated 3-ton minimum
• Wheel chocks
• Shop towels
• Safety glasses
• Nitrile gloves

---

🔩 Required Parts

HowToo sells all the parts you need for this repair:

• Timing chain kit - Qty: 1
• Timing chain tensioner - Qty: 1
• Timing chain guide set - Qty: 1
• Timing cover gasket set - Qty: 1
• Front crankshaft seal - Qty: 1
• Water pump gasket - Qty: 1
• Engine coolant HOAT/OAT compatible - Qty: As needed
• Engine oil - Qty: As needed
• Oil filter - Qty: 1
• RTV engine sealant - Qty: 1
• Serpentine belt - Qty: 1
• Crankshaft pulley bolt - Qty: 1

---

📋 Before You Begin

• Park your Grand Cherokee on level ground and let the engine cool completely.
• Set the parking brake and place wheel chocks behind the rear wheels.
• Open the hood and disconnect the negative battery cable using a 10mm socket.
• Take photos before removing parts. This helps you remember hose, bracket, and wiring positions.
• A harmonic balancer is the large pulley on the front of the crankshaft. It must be pulled off with a special puller.
• A torque wrench tightens bolts to a measured amount so parts are not too loose or too tight.

---

🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Disconnect Battery

• Use a 10mm socket to loosen the negative battery cable clamp.
• Move the cable away from the battery terminal so it cannot spring back.
• Tip: Wrap the cable end with a towel.

Step 2: Raise and Secure Front of Vehicle

• Use a floor jack rated 3-ton minimum to raise the front of your Grand Cherokee if you need more working room.
• Place jack stands rated 3-ton minimum under approved front support points.
• Keep wheel chocks behind the rear wheels.

Step 3: Remove Engine Covers and Intake Ducting

• Use a flat-blade screwdriver to loosen the intake tube clamps.
• Use a 10mm socket to remove any intake duct fasteners.
• Lift off the engine cover by hand if it blocks access.

Step 4: Drain Coolant

• Place a drain pan 2-gallon minimum under the radiator drain area.
• Open the drain carefully by hand or with a flat-blade screwdriver, depending on access.
• Remove the coolant reservoir cap only after the engine is cool.

Step 5: Remove Fan Shroud and Cooling Fan Assembly

• Use a plastic trim clip removal tool to remove plastic clips from the upper shroud.
• Use a 10mm socket to remove fan shroud bolts.
• Unplug the electric fan connector by pressing the lock tab by hand.
• Lift the fan and shroud assembly upward carefully.

Step 6: Remove Serpentine Belt

• Use a serpentine belt tool on the belt tensioner.
• Rotate the tensioner to release belt tension.
• Slide the belt off the pulleys and remove it.
• Tip: Draw the belt path before removal.

Step 7: Remove Front Accessories Blocking Timing Cover

• Use 13mm socket and 15mm socket as needed to remove accessory brackets blocking the front timing cover.
• Move wiring harnesses and hoses aside gently by hand.
• Do not stretch electrical connectors or coolant hoses.

Step 8: Remove Harmonic Balancer

• Use a crankshaft holding tool (specialty) to keep the crankshaft from turning.
• Use a 24mm socket and 1/2-inch drive breaker bar to loosen the crankshaft pulley bolt.
• Remove the bolt and washer.
• Use a harmonic balancer puller (specialty) to pull the balancer straight off the crankshaft.
• Do not pry against the timing cover.

Step 9: Remove Water Pump if Required for Cover Access

• Use an 8mm socket or 10mm socket to remove water pump bolts, depending on bolt location.
• Pull the water pump straight forward.
• Use a gasket scraper plastic to clean old gasket material from the mating surface.

Step 10: Remove Timing Cover

• Use an 8mm socket, 10mm socket, and 13mm socket to remove the timing cover bolts.
• Note bolt locations because lengths may vary.
• Gently separate the cover from the engine using a plastic trim clip removal tool if needed.
• Do not gouge the aluminum sealing surfaces.

Step 11: Set Engine to Top Dead Center

• Use a 24mm socket on the crankshaft bolt area to rotate the engine clockwise only.
• Align the crankshaft and camshaft timing marks according to the timing chain marks.
• Top Dead Center means piston number 1 is at the top of its compression stroke.
• Tip: Paint marks make alignment easier.

Step 12: Remove Timing Chain Tensioner and Guides

• Use a 10mm socket to remove the timing chain tensioner bolts.
• Use a 10mm socket or 13mm socket to remove timing guide bolts.
• Remove the guides and tensioner.
• Keep the camshaft and crankshaft from moving.

Step 13: Remove Timing Chain

• Use a camshaft holding tool (specialty) if the camshaft wants to rotate.
• Slide the timing chain off the camshaft gear and crankshaft gear.
• Do not rotate the engine after chain removal.

Step 14: Install New Timing Chain

• Match the colored links on the new timing chain kit to the camshaft and crankshaft timing marks.
• Install the chain over the crankshaft gear and camshaft gear.
• Confirm all timing marks line up before installing tensioner parts.

Step 15: Install New Guides and Tensioner

• Use a 10mm socket to install the new timing chain guides.
• Use a 3/8-inch drive torque wrench to tighten guide bolts to Torque to 12 Nm (9 ft-lbs).
• Use a 10mm socket to install the new tensioner.
• Use a 3/8-inch drive torque wrench to tighten tensioner bolts to Torque to 12 Nm (9 ft-lbs).
• Release the tensioner only after all marks are confirmed.

Step 16: Verify Timing by Hand

• Use a 24mm socket and 1/2-inch drive breaker bar to rotate the engine clockwise two full turns.
• Stop immediately if you feel hard binding.
• Recheck that the timing marks return to their correct relationship.

Step 17: Clean and Reseal Timing Cover

• Use a gasket scraper plastic to clean the engine block and timing cover surfaces.
• Wipe surfaces clean with shop towels.
• Install the new front crankshaft seal into the timing cover if not preinstalled.
• Apply RTV engine sealant at the factory-style joint areas where the cover meets the oil pan and block.

Step 18: Reinstall Timing Cover

• Place the timing cover onto the engine carefully.
• Start all bolts by hand first to avoid cross-threading.
• Use an 8mm socket, 10mm socket, and 13mm socket to snug the bolts evenly.
• Use a 3/8-inch drive torque wrench to tighten small timing cover bolts to Torque to 12 Nm (9 ft-lbs).
• Use a 3/8-inch drive torque wrench to tighten larger timing cover bolts to Torque to 28 Nm (21 ft-lbs).

Step 19: Reinstall Water Pump

• Install the new water pump gasket.
• Use an 8mm socket or 10mm socket to start all water pump bolts by hand.
• Use a 3/8-inch drive torque wrench to tighten water pump bolts to Torque to 24 Nm (18 ft-lbs).

Step 20: Reinstall Harmonic Balancer

• Use a harmonic balancer installer (specialty) to press the balancer onto the crankshaft.
• Install a new crankshaft pulley bolt.
• Use a crankshaft holding tool (specialty) to hold the crankshaft.
• Use a 1/2-inch drive torque wrench and 24mm socket to tighten the crankshaft bolt to Torque to 176 Nm (130 ft-lbs).

Step 21: Reinstall Accessories and Belt

• Use 13mm socket and 15mm socket to reinstall accessory brackets.
• Use a serpentine belt tool to rotate the tensioner.
• Install the new serpentine belt following the belt routing path.
• Make sure the belt sits fully in each pulley groove.

Step 22: Reinstall Fan and Intake Parts

• Lower the fan and shroud assembly back into place.
• Use a 10mm socket to install fan shroud bolts.
• Reconnect the fan electrical connector by hand.
• Use a flat-blade screwdriver to tighten intake tube clamps.

Step 23: Refill Coolant and Reconnect Battery

• Refill the cooling system with compatible engine coolant HOAT/OAT compatible.
• Use a 10mm socket to reconnect the negative battery cable.
• Check that no tools are left in the engine bay.

Step 24: Start and Check Operation

• Start the engine and listen for abnormal rattling or knocking.
• Watch the temperature gauge as the engine warms up.
• Check for coolant, oil, and timing cover leaks using safety glasses and nitrile gloves.

---

✅ After Repair

• Let the engine reach operating temperature and verify the cooling fan cycles on.
• Recheck coolant level after the engine cools.
• Change the engine oil and oil filter if coolant, dirt, or debris may have entered during the repair.
• Clear any stored cam/crank timing codes with a scan tool if codes were present before repair.
• Road test gently and listen for rattles during startup and acceleration.

---

💰 DIY vs Shop Cost

Shop Cost: $1,600-$2,800 USD equivalent (parts + labor)

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

You Save: $1,000-$1,900 USD equivalent by doing it yourself!

Shop labor rates vary but typically run $100-$150/hour. This repair takes a shop approximately 8-12 hours.

---

🎯 Ready to get started?

HowToo makes it easy: same-day/2-day shipping on every part, plus all the tools and specialty tools you need! Check out the parts and tools sections below to add everything to your cart.