Removing Camshafts, Cylinder Bank 1 - 3

Pull off the cable plug on the oil pressure sensor.
Remove 3 ignition coils. Pull off the cable plug on the ignition coils. Unscrew the 2 M6 x 25 pan-head screws (hexagon socket a/f 5), pull the ignition coils out of the spark-plug recess.
NOTE:
- If the camshaft adjustment valve is to be removed, the O-ring and the oil strainer must be replaced.
- The cover with integral seal for the camshaft adjustment valve must also be replaced.
Pull off the cable plug on the camshaft adjustment valve. Remove the holder and the cover for the valve on the cylinder head cover. Unscrew two M6 x 20 pan-head screws (hexagon socket a/f 5), remove the connection cable for the camshaft adjustment valve from the sheetmetal bracket and remove the holders. Pull off the valve cover.
Remove the oil abstraction pump and the brown closure cap (45 mm). Unscrew the 4 M6 x 20 hexagon-head bolts on the oil extraction pump and remove the pump carefully (do not damage the fitting bore). Press a screwdriver into the Centre of the piercing point of the closure cap and lever off the cover.

Fig 1: Identifying Oil Extraction Pump Identification Mark
Courtesy of PORSCHE OF NORTH AMERICA, INC.
Remove 2 green closure caps. Press a small screwdriver into the Centre of the piercing point of the closure cap and lever off the cover.
Turn the engine clockwise at the belt pulley of the crankshaft to the overlapping TDC of cylinder 1. Fix with special tool (fixing pins) 9595/1. At this point, the smaller circular cutout on the cut grooves of the inlet and exhaust camshafts on cylinder 1 must point towards the cylinder head cover. See Fig 3 (check with adjustment gauge 9686). If this is not the case, turn the engine through another 360° as described above.

Fig 2: Installing Special Tool At The Belt Pulley Of The Crankshaft
Courtesy of PORSCHE OF NORTH AMERICA, INC.

Fig 3: Positioning Camshafts In Overlapping TDC Of Cylinders 1 Or 4
Courtesy of PORSCHE OF NORTH AMERICA, INC.

NOTE: Before disassembling the cylinder head cover, it is essential to unscrew the central screw on the camshaft adjustment device.
Unscrew the central screw on the camshaft adjustment device. Position the retaining tool 9685 on the hexagon of the adapter and place the contact block as a counter on the fitting bore of the cylinder head cover; if necessary, position the contact block by undoing and tightening the M8 hexagon-head bolt. If the special tool can not be positioned on the hexagon of the adapter in this way, the engine must be turned further in the direction of rotation at the belt pulley of the crankshaft until the contact block comes into contact with the central screw of the cylinder head cover, ready for unscrewing. Unscrew the central screw.

Fig 4: Identifying Central Screw On Camshaft Adjustment Device
Courtesy of PORSCHE OF NORTH AMERICA, INC.
Unscrew the 4 M6x16 hexagon-head bolts on the chain sprocket of the exhaust camshaft. Do not remove the chain sprocket.
CAUTION: When levering off the cylinder head cover, the cast lugs may break.
Remove the cylinder head cover. See REMOVING AND INSTALLING CYLINDER HEAD COVER - ENGINE REMOVED, AS OF MY 2003 .
Turn the engine at the assembly support so that cylinder bank 1 - 3 stands vertically upwards.
Remove the chain tensioner side 1-3 -arrow- (hexagon a/f 30). See Fig 5.

Fig 5: Locating Chain Tensioner Side Hexagon 1-3
Courtesy of PORSCHE OF NORTH AMERICA, INC.
Remove the chain sprocket of the exhaust camshaft 1 - 3. Lift control chain off the chain sprocket and remove the chain sprocket. Lay the control chain on the mounting tab for the chain sprocket.
Remove the 4 camshaft thrust bearings and the guide rail. Unscrew 8 pan-head screws (hexagon socket a/f 5): 6 M6 x 35, 2 M6 x 40. Lift the thrust bearing and the guide rail carefully off the bearing surfaces or the control chain.
Remove camshafts. Remove the exhaust camshaft 1 - 3, lift the control chain off the camshaft adjuster of the inlet camshaft 1 - 3 and remove the camshaft. Lay the control chain in the chain housing in the cylinder head.