Cylinder Head

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Cylinder head:

Fig 1: Cylinder Head Components Location

Courtesy of PORSCHE CARS NORTH AMERICA, INC.

Cylinder head

Cylinder head
Cylinder-head gasket - replace
Chain case screws, M6 x 25 (cylinder bank 3-4, one M6 x 65 screw)
Cylinder head screw, internal Torx M12 x 1.5 x 140
Valve lift adjustment valve
O-ring - replace
Screw, M5 x 12 > Tightening torque 8 Nm (6 ftlb.)

Location	Description	Type	Basic value	Tolerance
Phase sensor to cylinder head	Internal Torx, M6 x 14 - always replace	Tightening torque	4 Nm (3 ftlb.)
Phase sensor to cylinder head	Internal Torx, M6 x 14 - always replace	Torque angle	60°
Stopper for pressurized oil bore on cylinder head	M12 x 1.5	Tightening torque	23 Nm (17 ftlb.)
Stopper for pressure oil filling on cylinder head	M12 x 1.5	Tightening torque	25 Nm (19 ftlb.)	+/- 2.5 Nm (2 ftlb.)
Stopper for pressurized oil bore	M10 x 1 (6.8)	Tightening torque	12 Nm (9 ftlb.)
Ground strap to cylinder head 3-4	Torx screw, M8 x 20 (10.9)	Tightening torque	23 Nm (17 ftlb.)
Ground strap to body	Screw, M8	Tightening torque	23 Nm (17 ftlb.)
Bearing pin for guide and tensioning rails	Hexagon socket M6 x 12 (10.9)	Tightening torque	10 Nm (7.5 ftlb.)
Chain tensioner	M22 x 1.5; replace sealing ring	Tightening torque	80 Nm (59 ftlb.)
Vacuum line to vacuum pump and crankcase	M6 x 14	Tightening torque	10 Nm (7.5 ftlb.)

Tightening sequence for cylinder head:

Fig 2: Cylinder Head Screws Tightening Sequence

Courtesy of PORSCHE CARS NORTH AMERICA, INC.

Tightening sequence for cylinder head, cyl. 1-2 and cyl. 3-4

1-6 Screw, internal Torx M12 x 1.5 x 140 > Initial tightening 5 Nm (3.5 ftlb.) > Tightening torque 50 Nm (37 ftlb.) > Loosen all screws 0 Nm (0 ftlb.) > Initial tightening 4 Nm (3 ftlb.) > Subsequent tightening 12 Nm (9 ftlb.) > Torque angle 65° > Torque angle 60° > Final tightening torque angle 65° > Final tightening torque angle 60°

Tightening sequence for chain case screws:

Fig 3: Chain Case Screws Tightening Sequence

Courtesy of PORSCHE CARS NORTH AMERICA, INC.

Tightening sequence for chain case screws, cyl. 1-2 and cyl. 3-4

item 1-6 on cylinder head 1-2 Screws, M6 x 25 - observe tightening sequence > Initial tightening 5 Nm (3.5 ftlb.) > Torque angle 45°

item 1 on cylinder head 3-4 Screw, M6 x 65 > Initial tightening 5 Nm (3.5 ftlb.) > Torque angle 70°

item 2-6 on cylinder head 3-4 Screws, M6 x 25 - observe tightening sequence > Initial tightening 5 Nm (3.5 ftlb.) > Torque angle 45°

Engine mount bracket to cylinder head

Fig 4: Engine Mount Bracket Components Location

Courtesy of PORSCHE CARS NORTH AMERICA, INC.

Bracket for engine mount

Bracket for engine mount
Screw, M8 x 35 > Tightening torque 33 Nm (24 ftlb.)
Screw, M8 x 45 > Tightening torque 33 Nm (24 ftlb.)
Screw, M8 x 110 > Tightening torque 33 Nm (24 ftlb.)
Screw, M8 x 125 > Tightening torque 33 Nm (24 ftlb.)