Porsche Workshop Service and Repair Manuals

Crankshaft: Specifications
Crankshaft Journal Dimensions

Main Bearing Journal

Standard  ...........................................................................................................................................................  69.971 - 69.990 mm (2.7548 - 2.7555 in)
-0.25 mm (-0.010 in) undersize  

Bearing ........................................................................................................................................................  69.721 - 69.740 mm (2.7449 - 2.7457 in)

-0.50 mm (-0.020 in) undersize  

Bearing ..........................................................................................................................................................  69.471 - 69.490 mm (2.735 - 2.7358 in)

Main Bearing to Crankshaft Clearance

Radial Clearance

New  ................................................................................................................................................................  0.028 - 0.070 mm (0.0011 - 0.0028 in)
Wear limit  ...................................................................................................................................................................................  0.16 mm (0.0063 in)

Axial Clearance

New  ..................................................................................................................................................................  0.06 - 0.192 mm (0.0024 - 0.0076 in)
Wear limit  .....................................................................................................................................................................................  0.40 mm (0.016 in)

Connecting Rod Bearing Journal

Standard  ...........................................................................................................................................................  51.971 - 51.990 mm (2.0461 - 2.0468 in)
-0.25 mm (-0.010 in) undersize  

Bearing ..........................................................................................................................................................  51.721 - 51.740 mm (2.0363 - 2.037 in)

-0.50 mm (-0.020 in) undersize  

Bearing ........................................................................................................................................................  51.471 - 51.490 mm (2.0264 - 2.0272 in)

Connecting Rod Bearing to Crankshaft Clearance

Radial  .....................................................................................................................................................................  0.027 - 0.069 mm (0.001 - 0.0027 in)
Axial  ............................................................................................................................................................................  0.08 - 0.24 mm (0.003 - 0.009 in)

Thrust Bearing Width

Standard  .............................................................................................................................................................  30.00 - 30.052 mm (1.1811 - 1.1831 in)
Reconditioned size  ...........................................................................................................................................  30.200 - 30.239 mm (1.1890 - 1.1905 in)

NOTE:  It is recommended to check the availability of bearing sizes prior to machining the crankshaft.