Grand Cherokee 2WD V8-4.7L VIN J (2004)
INSPECTION
1. Inspect the cylinder head for out-of-flatness, using a straightedge and a feeler gauge. If tolerances exceed 0.0508 mm (0.002 in.) replace the
cylinder head.
2. Inspect the valve seats for damage. Service the valve seats as necessary.
3. Inspect the valve guides for wear, cracks or looseness. If either condition exist, replace the cylinder head.
INSTALLATION
NOTE: The cylinder head bolts are tightened using a torque plus angle procedure. The bolts must be examined BEFORE reuse. If the threads are
necked down the bolts should be replaced.
Necking can be checked by holding a straight edge against the threads. If all the threads do not contact the scale, the bolt should be replaced (Fig. 13).
CAUTION: When cleaning cylinder head and cylinder block surfaces, DO NOT use a metal scraper because the surfaces could be cut or ground. Use
only a wooden or plastic scraper.
1. Clean the cylinder head and cylinder block mating surfaces.
2. Position the new cylinder head gasket on the locating dowels.
CAUTION: When installing cylinder head, use care not to damage the tensioner arm or the guide arm.
3. Position the cylinder head onto the cylinder block. Make sure the cylinder head seats fully over the locating dowels.
NOTE: The four smaller cylinder head mounting bolts require sealant to be added to them before installing. Failure to do so may cause leaks.
4. Lubricate the cylinder head bolt threads with clean engine oil and install the ten M10 bolts.
5. Coat the four M8 cylinder head bolts with Mopar Lock and Seal Adhesive then install the bolts.
NOTE: The cylinder head bolts are tightened using an angle torque procedure, however, the bolts are not a torque-to-yield design.
6. Tighten the bolts in sequence (Fig. 30) using the following steps and torque values:
^
Step 1: Tighten bolts 1-10, 27 Nm (20 ft. lbs.).
^
Step 2: Verify that bolts 1-10, all reached 27 Nm (20 ft. lbs.), by repeating step-1 without loosening the bolts. Tighten bolts 11 thru 14 to 14
Nm (10 ft. lbs.).
^
Step 3: Tighten bolts 1-10, 90 degrees.
^
Step 4: Tighten bolts 1-10, 90 degrees, again. Tighten bolts 11-14, 26 Nm (19 ft. lbs.)
7. Install the secondary chain and secondary chain guide.
8. Install the cylinder head access plug.
9. Re-set and install the right side secondary chain tensioner.
10. Remove Special Tool 8515.
11. Install the timing chain cover.
12. Install the crankshaft damper.
13. Install accessory drive belt.
14. Install the cylinder head cover.
15. Install the intake manifold.
16. Install oil fill housing onto cylinder head.
17. Refill the cooling system.
18. Raise the vehicle.
19. Install the exhaust pipe onto the right exhaust manifold.
