Performance Water Pump Timing Chain & Head Gasket Kit for Jeep Grand Cherokee (2004-2007) 4.7L

Heavy-Duty Timing Chain, Water Pump & Head Gasket Master Rebuild Kit for 2004-2007 Jeep Grand Cherokee (WJ / WK)

What it Does: The complete overhaul kit refreshes the entire valve timing, cooling, and cylinder sealing system on the 2004-2007 Grand Cherokee to restore compression, resolve chain slack, and prevent catastrophic thermal engine failure.

The Stock Jeep Grand Cherokee Timing & Thermal Management Weakness

The Chrysler 4.7L PowerTech SOHC V8 engine utilizes an iron block paired with aluminum cylinder heads, creating severe differential thermal expansion under load. The factory composite head gaskets break down under repeated heat cycles, resulting in combustion leaks, coolant contamination, and cylinder head warping. Simultaneously, the factory multi-stage timing system relies on nylon-faced tensioners and cast guide rails that fatigue with age. As nylon tensioner shoes disintegrate, debris drops directly into the oil pan, clogging the pickup screen while timing chains stretch—causing cam-to-crank synchronization codes (P0016), valvetrain clatter, and eventual valve-to-piston contact.

The Engineering Solution

This master rebuild package integrates heavy-duty Multi-Layer Steel (MLS) head gaskets that maintain an elastic seal against thermal distortion, matched with high-grade replacement cylinder head torque-to-yield hardware. The timing drive features pre-stretched link-belt secondary and primary chains, hardened 25-tooth crank and 50-tooth idler sprockets, and reinforced primary and secondary hydraulic tensioners to eliminate lash. A high-efficiency oil pump is designed to ensure oil flow to overhead cams, while an OE-specification cast-impeller water pump ensures uniform coolant circulation to stabilize operating temperatures across all combustion chambers.

What's Included

• 1 Multiple Layers Steel (MLS) Head Gasket
• 1 Valve Cover Gasket
• 1 Valve Stem Seals
• 1 Intake Manifold Gasket
• 1 Exhaust Manifold Gasket
• 1 Front Camshaft Seal
• 1 O-rings
• 1 Other Small Gaskets
• 28 Cylinder Head Bolts (20 Long Bolts, 8 Short Bolts)
• 1 Timing Chain Lower (70 Links)
• 2 Timing Chain (106 Links-Secondary 2 Required)
• 1 Tensioner Right (Secondary Tensioner)
• 1 Tensioner Left (Secondary Tensioner)
• 1 Tensioner Primary (Tensioner & Guide Plate)
• 2 Guide Rail (Tensioner Rail 2 Required)
• 2 Guide Rail (Fixed Rail 2 Required)
• 1 Sprocket Right (30 Teeth With Jtec Ring)
• 1 Sprocket Left (30 Teeth Has No Ring)
• 1 Crank Sprocket (25 Teeth)
• 1 Idler Sprocket (50 Teeth Primary)
• 1 Idler Sprocket (Secondary-Dual 30/30 Teeth)
• 1 Engine Water Pump
• 1 Oil Pump

Technical Specifications

Compatibility

• 2004 Jeep Grand Cherokee (WJ) 4.7L V8
• 2005-2007 Jeep Grand Cherokee (WK) 4.7L V8

Frequently Asked Questions & Fitment Warnings

Does this fit the WJ / WK Grand Cherokee?

Yes, this is a direct fit for the 2004-2007 Jeep Grand Cherokee equipped with the 4.7L PowerTech engine. It does not fit the 3.7L V6, 5.7L HEMI V8, or 6.1L SRT8 engines.

Which reluctor profile does the right-hand camshaft sprocket use?

The included right-hand camshaft gear features the 30-tooth JTEC-pattern tone ring designed for matching factory camshaft position sensor calibration.

The Jeep Standard

Engineered to handle sustained trail use and severe-duty towing conditions, this kit restores structural compression integrity and valvetrain synchronization for long-term off-road and highway reliability.