Porsche 924 Workshop Manual page 45

10
Engine / C rankca se
Cylinder Head and Valves
Cylinder head surface
Valves:
a) intake
b) exhaust
c) intake
d) exhaust
Valve guides:
Intake and exhaust
Valve stem:
Intake
Exhaust
Valve guide/valve stem
Intake
Exhaust
Compression
Pressure difference betw.
individual cylinders
Pistons and Connecting Rods
Cylinder/ piston
Weight difference of pistons in
one engine
Pistons rings
Piston rings
Connecting rod weight
Permissable weight difference
of connecting rods in one engine
Connecting rod bushing
Piston pin
Connecting rod bushing/piston pin
distortion
seat width
seat width
seat angle
seat angle
inside dia.
dia.
dia.
clearance
pressure
clearance
repairing
side clearance
gap
standard
new
repairing
dia.
dia.
radial play
10 - 02 Tolerances and wear Limits
New Size
2. 2 - 3. 0 mm
(0. 087 - 0. 118 in.)
2. 2 - 3. 0 mm
(0. 087 - 0. 118 in.)
45°
0
45
9. 000 - 9 . 015 mm
(0. 3543-0. 3549 in. )
8. 97 mm (0. 353 in. )
8. 95 mm (0. 352 in. )
O.
4 mm (0. 0157 in.)
O.
5 mm (0. 020 in.)
8 - 11 bar
(114 - 156 psi)
Wear Limit
max. 0.1 mm
(0 . 004 in.)
O. 8 mm (0. 0315 in.)
1. 0 mm (0. 04 in. )
6 bar
(85 psi)
max. 3 bar
(43 psi)
O.
03 mm (0. 0011 in. ) 0. 08 mm (0. 0031 in.)
0. 04 - 0. 07 mm
(0. 0016 - 0. 0028 in.)
0. 3 - O. 5
mm
(0. 012 - 0. 020 in. )
815 - 927 grams
8 grams
8
gram~
24. 012 - 24. 018 mm
(0. 9454 - 0. 9456 in. )
23. 996 - 24. 000 mm
(0 . 9447 - 0. 9449 in.)
0. 01 - 0. 02 mm
(0. 0004 - 0. 0008 in.)
max. 14 grams
0.1 mm
(0. 004 in.)
1. 0 mm
(0. 04 in.)
Printed in Germany