Porsche 996 TT Repair Manual page 532

2. Fit auxiliary chain tensioner for both cylinder banks. Unscrew two hexagon−head bolts M6 on each chain
tensioner cover and remove the covers with the chain tensioner. Subsequently screw on both auxiliary
chain tensioners and then apply pretension using the hexagon−head bolt until the first ring on the piston
just disappears from view.
3. Fit dial gauge. A dial gauge is affixed to the first cylinder on cylinder bank 1 − 3 using the universal dial
gauge holder. Extend the probe of the dial gauge until it is certain that measurement on the piston crown is
possible.
4. To set the timing, the respective cylinder side must be positioned to overlapping TDC. For this purpose,
turn the engine at the belt pulley of the crankshaft (in operating direction) until the maximum defection
(reversing point) is attained on the dial gauge. The cams of the 1st cylinder point towards each other
−Figure 4.1− , the cams of the 4th cylinder point away from each other (each points towards cylinder
head outer wall) −Figure 4.2− .
Figure 4.1: Position of the camshafts on overlapping of cylinder 1
• 1 − Exhaust camshaft
• 2 − Inlet camshaft
Figure 4.2: Position of the camshafts on overlapping of cylinder 4
• 2 − Inlet camshaft
• 1 − Exhaust camshaft
Setting the camshafts (timing)
einordnung
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