Porsche 944 - Manual (Page 55)

944 Engine, Crankcase
10
Tolerances and wear limits
Engine M 44.40/41
Cylinder head with valves
Mating surface
Valve seat width
Exhaust
Seating angle
Outer correction angle
Inner correction angle
Valve guides:
Valve stem:
Intake
Exhaust
Valve guide/valve stem
Intake
Exhaust
Compression
Pistons with connecting rods
Cylinders/pistons
Piston rings M 44/40
Piston rings M 44/41
Piston rings M 44/40
Piston rings M 44/41
Distortion
Intake:
Inner dia.
Dia.
Dia.
Rocking clearance
Clearance
Height clearance
Height clearance
Groove 1
Groove 2
Groove 3
Groove 1
Groove 2
Groove 3
Ring gap clearance
Ring gap clearance
Groove 1
Groove 2
Groove 3
Groove 1
Groove 2
Groove 3
For installing
(new)
1.5
1.8
45°
30°
60°
7 + 0.015
6.97 - 0.012
6.94 - 0.012
8 bar and
above
0.008-0.032
0.040...0.075
0.020...0.055
0.020...0.055
0.040...0.075
0.030...0.065
0.020...0.055
0.20...0.40
0.20...0.45
0.30...0.60
0.20...0.50
0.20...0.55
0.30...0.90
Wear
limit
max. 0.05
0.8
0.8
6.5 bar
approx.
0.080
Tolerances and wear limits
Printed in Germany - XXIV, 1991
10 - 0103