7
Valve timing
Inlet valve diameter
41 mm
Inlet valve lift
12.5 mm
Exhaust valve
35.5 mm
Exhaust valve lift
11.1mm
Maximum inlet valve lift
105° after TDC
Maximum exhaust valve lift
115° before TDC
Adjusting the valve timing on the GT3 Cup engine model
2008. Camshaft opening lead/closing lag (105° / 115°)
with special tool 000 721 996 10 and accessories.
Description:
Set cylinder number 1 to TDC using a dial gauge indicator
Fit degree wheel 996 450 131 00
Fit the camshaft 1 - 3 at the TDC exhaust / inlet valve
overlap
and fix the inlet and exhaust valves with the special tool
000 721 966 10 with inlet special tool
996 450 *****
, and
exhaust special tool
000 721 *****
.
Mount the chain tensioning tool 00072194010.
Tighten camshaft wheels to approximately
30 Nm
torque.
Remove the special tool from the camshaft slits.
Rotate the crankshaft 360°
Fit the camshaft 4 - 6 at TDC exhaust / inlet valve overlap
and fix the inlet and exhaust valves with the special tool
00072196610 with inlet special tool 9964501*****, and
exhaust special tool 000721*****.
Tighten camshaft wheel to approximately
30 Nm
.
Remove the special tool from the camshaft slits.
Set engine to Cyl 1
TDC exhaust / inlet valve overlap
Rotate the engine three turns, and then pretension the chain
tension tool to the marks.
