Xterra 4WD V6-3.3L SC (VG33ER) (2003)
5. Tighten the cylinder head bolts and the intake manifold bolts in 14 steps, and in the numerical order as shown. Use the specified angle wrench as
necessary.
Angle wrench : ST10120000 (J24239-01)
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Apply engine oil to the threads and seating surfaces of the cylinder head bolts before installation.
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Cylinder head bolts No. 4, 7, 9, and 12 (L1) are longer than the others (L2).
Cylinder head bolts "L" : 127 mm (5.00 inch)
Cylinder head bolts "Lo : 106 mm (4.17 inch)
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Install the intake manifold and the cylinder head at the same time using the 14 steps.
Cylinder head and intake manifold nuts and bolts tightening:
Step 1 : tighten cylinder head bolts 29 Nm (3.0 kgf-cm, 22 ft. lbs.)
Step 2 : tighten cylinder head bolts 59 Nm (6.0 kgf-cm, 43 ft. lbs.)
Step 3 : loosen all cylinder head bolts completely
Step 4 : tighten cylinder head bolts 10 Nm (1.0 kgf-cm, 7 ft. lbs.)
Step 5 : tighten intake manifold bolts and nuts 4 Nm (0.4 kgf-cm, 2.9 ft. lbs.)
Step 6 : tighten intake manifold bolts and nuts 18 Nm (1.8 kgf-cm, 13 ft. lbs.)
Step 7 : tighten intake manifold bolts and nuts 16 - 20 Nm (1.6 - 2.0 kgf-cm, 12 -14 ft. lbs.)
Step 8 : loosen all intake manifold bolts and nuts completely
Step 9 : tighten cylinder head bolts to 29 Nm (3.0 kg-m, 22 ft. lbs.)
Step10 : tighten cylinder head bolts 60° - 65° degrees (clockwise), if an angle wrench is not available, tighten cylinder head bolts 54 - 64 Nm (5.5
- 6.5 kgf-cm, 40 - 47 ft. lbs.)
Step 11: tighten cylinder head sub-bolts to 9.0 -11.8 Nm (0.92 -1.20 kgf-cm, 6.7 - 8.7 ft. lbs.)
Step 12: tighten intake manifold bolts and nuts to 4 Nm (0.4 kgf-cm, 2.9 ft. lbs.)
Step 13: tighten intake manifold bolts and nuts to 9 Nm (0.9 kgf-cm, 6.5 ft. lbs.)
Step 14: tighten intake manifold bolts and nuts to 8 - 10 Nm (0.8 -1.0 kgf-cm, 5.8 - 7 ft. lbs.)