Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSINFINITI2008FX45 AWD V8-4.5L (VK45DE)REPAIR AND DIAGNOSISSPECIFICATIONSMECHANICAL SPECIFICATIONSENGINESYSTEM SPECIFICATIONSTIGHTENING TORQUE AND SEQUENCECYLINDER HEAD
2008 Infiniti FX45 AWD V8-4.5L (VK45DE)
Cylinder Head
2008 Infiniti FX45 AWD V8-4.5L (VK45DE)SECTION Cylinder Head
Cylinder Head
Install cylinder head follow the steps below to tighten cylinder head bolts in numerical order as shown in the figure with cylinder head bolt wrench (commercial service tool).
CAUTION:
If cylinder head bolts are re-used, check their outer diameters before installation. Refer to "Cylinder Head Bolts Outer Diameter".
Apply new engine oil to threads and seating surface of cylinder head bolts.
Tighten all cylinder head bolts.
Torque 98.1 Nm (10 kg-m, 72 ft-lb)
Completely loosen all cylinder head bolts.
Torque 0 Nm (0 kg-m, 0 ft-lb)
CAUTION:
In step "c", loosen cylinder head bolts in reverse order of that indicated in the figure.
Tighten all cylinder head bolts.
Torque 44 Nm (4.5 kg-m, 32 ft-lb)
Turn all cylinder head bolts 60 degrees clockwise. (Angle tightening)
CAUTION:
Check the tightening angle by using angle wrench (SST). Avoid judgment by visual inspection without SST.
Check tightening angle indicated on angle wrench indicator plate.
Turn all cylinder head bolts 60 degrees clockwise again. (Angle tightening)
Cylinder Head Bolts Outer Diameter
Cylinder head bolts are tightened by plastic zone tightening method. Whenever the size difference between "d1" and "d2" exceeds the limit, replace them with new one.
Limit ("d1" - "d2") 0.18 mm (0.0071 in)
If reduction of outer diameter appears in a position other than "d2", use it as "d2" point.
Install cylinder head follow the steps below to tighten cylinder head bolts in numerical order as shown in the figure with cylinder head bolt wrench (commercial service tool).
CAUTION:
If cylinder head bolts are re-used, check their outer diameters before installation. Refer to "Cylinder Head Bolts Outer Diameter".
Apply new engine oil to threads and seating surface of cylinder head bolts.
Tighten all cylinder head bolts.
Torque 98.1 Nm (10 kg-m, 72 ft-lb)
Completely loosen all cylinder head bolts.
Torque 0 Nm (0 kg-m, 0 ft-lb)
CAUTION:
In step "c", loosen cylinder head bolts in reverse order of that indicated in the figure.
Tighten all cylinder head bolts.
Torque 44 Nm (4.5 kg-m, 32 ft-lb)
Turn all cylinder head bolts 60 degrees clockwise. (Angle tightening)
CAUTION:
Check the tightening angle by using angle wrench (SST). Avoid judgment by visual inspection without SST.
Check tightening angle indicated on angle wrench indicator plate.
Turn all cylinder head bolts 60 degrees clockwise again. (Angle tightening)
Cylinder Head Bolts Outer Diameter
Cylinder head bolts are tightened by plastic zone tightening method. Whenever the size difference between "d1" and "d2" exceeds the limit, replace them with new one.
Limit ("d1" - "d2") 0.18 mm (0.0071 in)
If reduction of outer diameter appears in a position other than "d2", use it as "d2" point.
RENDER: 1.0x
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.