Porsche 2012 911 GT3 CUP Technical Manual page 28

3.7.4. Set valve timing
3.7.4.1. Valve timing
3.7.4.2. Special tools
Point of max inlet valve lift (EM)
Point of max exhaust valve lift (AM)
Porsche Motorsport recommends use of the following special tools to
adjust and set the valve timing of the 911 GT3 Cup
Base plate cylinder 1:
Base plate cylinder 2:
Guide element EM/AM 110/110:
Guide element EM/AM 105/115:
Degree wheel crankshaft:
Chain tensioner:
Setting jig TDC:
Retaining key timing chain sprocket:
105° after TDC
110° before TDC
996.721.549.90
996.721.550.90
996.721.551.9A
996.721.551.93
996.450.131.00
000.721.940.10
996.721.511.91
996.721.513.90
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