Removal and Replacement

CYLINDER HEAD

Removal and Installation


REMOVAL

1.Remove the engine from the vehicle. Refer to "2WD : Removal and Installation" Removal and Installation.
2.Remove the rear timing chain case. Refer to "Removal and Installation" Removal and Installation.
3.Remove the intake manifold. Refer to "Removal and Installation" Removal and Installation.
4.Remove the exhaust manifolds. Refer to "Exploded View" Exploded View.
5.Remove the intake and exhaust camshafts. Refer to "Removal and Installation" Removal and Installation.
6.Remove the coolant outlet housing. Refer to "Removal and Installation" Removal and Installation.





7.Remove the RH and LH cylinder head bolts with power tool.
- The bolts should be loosened gradually in three stages.
- Loosen the bolts in the numerical order as shown.
Revision: March 20122013 Infiniti JX










8.Remove cylinder heads and gaskets.
- Discard the cylinder head gaskets and use new gaskets for installation.

INSTALLATION






1.Turn the crankshaft until No. 1 piston is set at TDC on the compression stroke.
- The crankshaft key should line up with the RH cylinder center line as shown.





2.Install new cylinder head gaskets.

CAUTION:
Do not rotate crankshaft and camshaft separately or valves will strike piston heads.
3.Inspect the cylinder head bolts before installing the cylinder heads.

CAUTION:
Revision: March 20122013 Infiniti JX





Cylinder head bolts are tightened by degree rotation tightening method. Whenever the size difference between d1 and d2 exceeds the limit, replace the bolts with new ones.





-Lubricate threads and seat surfaces of the bolts with new engine oil.





4.Install the cylinder heads on the cylinder block. Tighten the cylinder head bolts in the five steps in the numerical order as shown using Tool.





-Tightening procedure:















5.Installation of the remaining components is in the reverse order of removal.
Revision: March 20122013 Infiniti JX