Pistons From Model 89 Onwards; Checking Pistons And Cylinder Bore - Porsche 944 Workshop Manual

944

Pistons from Model 89 onwards

Checking pistons and cylinder bore

Engine type M 44.41 (3.0 l)
Repair size Piston Ø
(mm)
MAHLE
Standard 103.980
103.990 +- 0.007
104.000
Oversize 1 104.480
104.490 +- 0.007
104.500
Checking pistons
Measure approx. 52 mm from crown of pis-
ton, 90' offset to axis of piston bolt.
Note
It is recommended that the stocks of the relevant tolerance group are checked before
machining
the cylinders. If necessary, hone to the piston size available.
In some cases, certain tolerance groups may be in short supply.
Pistons from Model 89 onwards
Printed in Germany - XXV, 1992
Engine/Crankshaft, Pistons
Engine M 44. 41 (3.0 I) worldwide
Compression ratio: 10.9 : 1
Nominal Ø 104.00 mm
The installation position is indicated by the
enlarged intake-valve pockets.
171/13
Cylinder bore
(mm)
104.000
104.010 +- 0.005
104.020
1 04.500
104.510 +- 0.005
104.520
Checking cylinder bore
Measure approx. 52 mm from top edge of
cylinder bore, across cylinder block.
For measurement, mount lower crankcase
section and tighten with prescribed tightening
torque.
Tolerance groups
Code
0
1
2
I 0
I 1
I 2
13 - 103
13