Porsche 928 Workshop Manual page 94

10
Engine / Crankcase 928
Valve guide/valve srem
lnrake
Exhaust
Compression
Clearance
When lnsralled
mew
Wear Limit
l
0.80
0.80
8 bar and more
6. 5 bar
Pistons and Connecting Rods
Cylinder/piston
Clearance 0.024 - 0.048
ca. 0.080
Pisron rings
Pirron rings
Side clearance
Groove 2 0.04 -
Groove 3 0.013 -
End clearance
Groove 1 = 0.20 to 0.40
Groove 2 = 0.20 co 0.40
Groo"e 3 = 0.40 to 1.40
Conrod bushing Diameter
Pisron pin
Diameter
Conrod bushing/piston pin Radial play
Crankshafr and Engine Block
Crankshafr Runour
0.04 - 0.06
max. 0.08
/measured on 2nd. 3rd or 4th
bearings. 1st and 5th bearings
iunnmg in vees)
Conrod bearing journal
Conrod bearing/crankshaft
Crankshafr bearing journal
Crankshaft bearing/crankshaft
Crankshaft bearing/crankshaft
Cylinder bore
Diamerer
51.971 - 51.990
Radial play
0.034 - 0.092
Axial play
0.100 - 0.400
Diameter
69.971 - 69.990
Radial play
0.020 - 0.098
Axial play
0.110 0.312
our-of-rrue 0.010
0.020
24 + 0.018
+ 0.028
24 - 0.004
0.018 - 0.032
l
10 - 02
Tolerances and Wear Limirs
xx, 1988 - Printed in Germany