System Specifications

Cylinder Block
Cylinder bore 96 mm (3.78 in)

Thrust-bearing screws securing lower part of crankcase to upper part of
crankcase





M11 x 1.5 x 130 (10 ea.)
Initial tightening 30 Nm (22 ftlb.)
Torque angle 90°
M10 x 1.5 x 117 (10 ea.)
Initial tightening 22 Nm (16 ftlb.)
Torque angle 60°

Lower part of crankcase to upper part of crankcase (cross bolt connection)





M8 x 70 (16 ea.) 23 Nm (17 ftlb.)
M8 x 35 (2 ea.) 23 Nm (17 ftlb.)
M8 x 50 (2 ea.) 23 Nm (17 ftlb.)

Crankshaft Main Bearings

The bearing shells are available in various classes. The classes are indicated by the colour marking on the outside. For every bearing (main and connecting rod bearings), the colour marking must match the corresponding letter on the flywheel flange of the crankshaft. -arrow- Each letter on the flywheel flange of the crankshaft indicates the correct color classification of the bearing shell.





Color marking on bearing shell

Select crankshaft bearing shell classification based on the inscription on the crankshaft's flywheel flange -9-. Example: YYYYB YYYY mean 5 main shaft bearings and 4 double connecting rod bearings (8 connecting rods in total). The letters are the abbreviations for the color code of the bearing shells (Y for yellow, B for blue, R for red). Based on the example above, yellow bearing shells are to be selected for the main shaft bearings 1 to 4 and a blue bearing shell is to be selected for the fifth main shaft bearing. The connecting rod bearing shells should all have a yellow marking in this case.





Crankshaft

1 - Crankshaft (stroke: 83 mm)
2 - Straight pin, 6 x 20
3 - Spring, 5 x 6.5
4 - Thrust washer
5 - Main bearing shell, upper
6 - Main bearing shell, lower
7 - Shaft seal
8 - View of crankshaft flange
9 - Crankshaft bearing classification (three types) (example: YYYYY-BBBB; 5 main shaft bearings with yellow marking, 4 double (8) connecting-rod bearings with blue marking)

Connecting rod bolts
Connecting rod bolts must always be replaced
First pass 8-10 Nm (6-7.5 ftlb.)
Second pass 20 Nm (15 ftlb.)
Third pass 40 Nm (30 ftlb.)
Final pass Torque angle 90°

Piston classification





1 - Mahle control stamp
2 - Arrow marking in direction of travel
3 - Porsche short numeric code without main or middle number
4 - Cylinder bank identification
5 - Marking area for weight group
6 - Marking area for dimension group
7 - Barcode 128 (short numeric code (without main group) and weight group)
8 - Direction of travel arrow
9 - Mahle short numeric code

Vibration damper to crankshaft M18 x 1.5 x 72
First pass 20 Nm (15 ftlb.)
Second pass 50 Nm (37 ftlb.)
Third pass 100 Nm (74 ftlb.)
Final pass Torque angle 180°