Porsche 912 E - Page 38

13
Engine, CrankshafU, Pistons
Checking and installing Camshaft
Checking Runout:
New:
Max. 0.02 mm
Wear limit: Max. 0.04 mm
Camshaft runout, checking
Checking
End Play (at thrust bearing)
New:
0,04 - 0.13 mm
Wear limit : 0.16 mm
Camshaft end pia y, checking
13 -
16,
Checking and Installing Camshaft
Check backlash over entire circumference of
camshaft gear.
The backlash between the camshaft gear and
crankshaft gear
is 0,00 - 0.05 mm.
The camshaft gear is of the right size when
the backlash is hardly noticeable and the
camshaft does not lift when the crankshaft is
turned in reverse direction •
To obtain the specified backlash, camshafts
are available with various sized timing gears
under different part numbers.
The gears are marked on the side facing the
cams below the teeth with stamped numerals
such
as "-1", "0", "+1", "+2" etc •• The
numerals indicate by 1/ 100 mm how the
pitch circle radius differs from the blueprint
dimension
"0".
Caution!
Do not confuse the numeral 0 with the symbol
0 which is a timing mark.
Crankshaft gears are available in one size only
and bear no
size markings.
Camshaft - Installation Position
Printed in
Germany