Porsche 996 TT Repair Manual page 535

Turn the engine on the belt pulley of the crankshaft by 360° clockwise so that the second cylinder side
can be set. (Observe maximum defection of dial gauge indicator or TDC position!).
11. Set cylinder side 4 − 6 in the same way as side 1 − 3 (cams of both camshafts on cylinder 4 point
away from each other).
Note
• Camshaft adjusting element must be positioned to the left−hand stop! Use special tool holding wrench
9653 !
12. Tighten sprocket wheels. Check whether the actuating element of the inlet camshaft is still on the
left stop. Subsequently tighten the sprockets of the inlet and exhaust camshafts with initial
tightening of 30 Nm (22 ftlb.). When doing so, counter the sprockets using the appropriate special
tools holding wrench 9653 or holding wrench 9653/1 . Subsequently remove the holding keys
9661/1 and tighten the exhaust camshaft with a 90° torque angle and the inlet camshaft with a
170° torque angle. Counter camshafts with the appropriate special tools.
13. Check the timing. Turn engine on belt pulley of crankshaft clockwise by 720°.
14. Refit the holding keys and check the timing on both cylinder sides.
15. Remove the adjustment devices and the dial gauge if timing is set correctly, otherwise repeat the setting.
16. Remove the auxiliary chain tensioner. To do this, relieve the auxiliary chain tensioner and loosen the two
fastening screws.
17. Reinstall chain tensioner. Insert the chain tensioner into the chain housing in accordance with its
identification, then fit the chain tensioner cover with a new seal. Tighten the hexagon−head bolts M6 to
10 Nm (7.5 ftlb.).
18. Clean sealing surface for the camshaft housing cover.
19. Install camshaft housing cover. Apply a silicone bead of a maximum 1.5 mm −Figure− (drying time of
sealant approx. 5 min). Put on the camshaft housing cover and tighten the 15 fastening screws from the
inside with tightening torque.
Tightening torque of hexagaon−head bolt M6 (8.8) 10 Nm (7.5 ftlb.)
20. Install solenoid hydraulic valve for valve lift adjustment. Put on holder with both hexagon−head bolts M6
x 25 and tighten the screws with tightening torque.
Tightening torque of hexagon−head bolt M6 (8.8) 10 Nm (7.5 ftlb.)
21. Fit the closure cap and the oil extraction pump with new O−rings. Tighten the hexagon−head bolts: 3 M6
x 20 for the closure cap and 3 M6 x 35 for the oil extraction pump to tightening torque.
Tightening torque of hexagon−head bolt M6 (8.8) 10 Nm (7.5 ftlb.)
22. Fit four new closure caps (green) for camshaft housing cover in dry state.
23. Install spark plugs ' 032000 Installing spark plugs .
Tightening torque of new spark plug 30 Nm (22 ftlb.); used spark plugs 25 Nm (19 ftlb.)
24.
Setting the camshafts (timing)
einordnung
472