2005 Jeep Grand Cherokee 4.7L — Labor Time References
🏪 Professional Flat Rate (from Mitchell ProDemand shop labor guide)
Head gasket replacement (both heads)
- Book Hours: 13.5 hours
Cylinder head R&R only (both, no gasket work)
- Book Hours: ~11.6 hours
- Valve job / resurface / magnaflux (machine shop)
- Book Hours: +4-6 hours extra
Total if sending heads to machine shop
- Book Hours: ~17-20 hours
Source: JustAnswer mechanic citing Mitchell ProDemand directly for the 2005 4.7L: "13.5-hour job to complete both sides according to my Mitchell Pro Demand manual."
💵 Cost Estimate Cross-Reference
| Source | Labor Cost | Implied Hours @ $100/hr |
|---|---|---|
| RepairPal (national avg) | $1,345 - $1,974 | 13.5 - 19.7 hrs |
| Jeep Commander forum (2013 shop) | $667 * | ~6.7 hrs (partial job) |
| Independent shop quote example | ~$1,200 - $1,500 | 12 - 15 hrs |
*Forum post seems low — may have been in-house labor rate or partial work
🔧 Real-World Estimates
| Scenario | Hours |
|---|---|
| Flat rate book time (Mitchell) | 13.5 hrs |
| Professional mechanic, efficient | 10-13 hrs |
| Experienced DIY, full job (gaskets + timing + water pump) | 16-22 hrs |
| First-time DIY, full recommended job (everything) | 22-30 hrs |
| First-time DIY, head gaskets only (no timing/pump extras) | 16-20 hrs |
Why a DIY takes longer than book time
The 13.5 flat rate is for a pro who:
- Has done it before (doesn't need to consult the manual every step)
- Has all the specialty tools in hand
- Has a lift and air tools
- Doesn't stop to run to the parts store for the bolt they snapped
- Doesn't take photos/label everything for reassembly
On the 4.7L specifically, a pro gets faster because:
- They don't fight the passenger exhaust manifold bolts (they expect them, have the right swivel socket setup)
- They don't strip any block threads because they've done it before
- They know the timing mark tricks (crank keyway at 2 o'clock, cam dots at 12)
- They don't over-torque the plastic intake (rookie mistake #1)
Plan 2-3 full days if you're doing it yourself for the first time with all the "while I'm in there" parts. The 13.5 book time is the shop's estimate — you're paying for the pro's speed, not the clock.