Cylinder Head Assembly

Cylinder Head Bolts

Left:

Right:

Replace the bolts

Ensure the cylinder head bolts that are being used are the proper pitch or engine damage will occur. The thread pitch on the M11 cylinder head bolts and the engine block cylinder head bolt holes have been revised. In order to prevent engine damage it is important to identify which thread pitch is being used. Cylinder head bolts with a pitch of 1.5 mm have a thread length of about 48 mm (1.890 in) long. Cylinder head bolts with a pitch of 2.0 mm have a thread length of about 67 mm (2.638 in) long.

First pass: M11 bolts 30 Nm (22 lb ft)
Second pass: M11 bolts Tighten an additional 60°
Third pass: M11 bolts Tighten an additional 60°
Fourth pass: M11 bolts Tighten an additional 60°
Final pass: M6 bolts at front of head 12 Nm (106 lb in)

Cylinder Head Flatness Inspection





If warpage is less than 0.05 mm (0.002 in), the cylinder head surface does not require resurfacing.
If warpage is between 0.05-0.20 mm (0.002-0.008 in), the cylinder head must be resurfaced.

Surface Flatness - Manifold Decks 0.220 mm (0.0087 in)

Intake Manifold Bolts Specifications

Exhaust Manifold Fasteners Specifications