13, Crankshaft Belt Drive

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Crankshaft

1	Crankshaft
2	Straight pin, 6 x 20
3	Spring, 5 x 6.5
4	Thrust washer (grooves facing out)
5	Main bearing shell, upper
6	Main bearing shell, lower
7	Shaft sealing ring => Do not touch sealing ring lip! Clean crankshaft flange and oil lightly
8	View of crankshaft flange
9	Crankshaft bearing classification (four types) G Yellow; B Blue, R Red; N Green => (example: GGGGG-BBBB; 5 main shaft bearings with yellow marking, 4 double (8) connecting rod bearings with blue marking) => For numbering, see A
A	Direction of travel (main bearing 1 is the first in direction of travel against output)

Fig 1: Belt Drive Components Location With Torque Specification

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Belt drive

1	Deflection roller > Tightening torque 32 Nm (24 ftlb.)
2	Hydraulic belt tensioner; tensioner to lever > Tightening torque 32 Nm (24 ftlb.) ; tensioning roller to tensioning lever > Tightening torque 32 Nm (24 ftlb.)
3	Screw, M8 x 96; complete lever to chain housing cover and cylinder head > Tightening torque 32 (24 ftlb.); Nm belt tensioner and timing chain housing cover to bracket Tightening torque 32 Nm (24 ftlb.)
4	Deflection roller > Tightening torque 32 Nm (24 ftlb.)
5	Dual poly V-belt

Fig 2: Piston, Connecting Rod Components Location With Torque Specification

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Piston, Connecting rod

1	Piston-ring set; oil with engine oil; TOP marking facing upwards; oil scraper ring down; ring gaps offset by 120°
2	Piston; different on naturally aspirated and turbo engines; combustion chamber recess facing centre of engine; left and right different; direction of travel arrow in direction of travel
3	Piston-pin circlip (positioned at 6 o'clock or 11 o'clock)
4	Piston pin; oil
5	Connecting rod
6	Connecting rod bolt; replace as it must be tightened in the plastic area; oil screw > Tightening torque 8 Nm (6 ftlb.) > Tightening torque 20 Nm (15 ftlb.) > Tightening torque 40 Nm (30 ftlb.) > Torque angle 90°
7	Connecting rod bearing shells; oil with engine oil

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Connecting-rod assembly, bearing shells

A	View A (identification area for connecting-rod number; fit connecting rod with identification area facing exhaust side; markings on rod and cap must be on the same side)
B	View B (fit bearing shells flush and press in by hand) Information Twist lock for bearing shells always on the same side.
C	View C (fit bearing shells flush and press in by hand)

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Piston classification, naturally aspirated engine

1	Marking for dimension group (just one permitted per engine, in this case x)
2	Porsche short numeric code without main or middle number
3	Short numeric code (supplier)
4	Marking area for weight group (just one permitted per engine, + or -)
5	Cylinder bank identification (V6 1-3 and 4-6) (V8 1-4 and 5-8)
6	Barcode 128 (short numeric code without main group or weight group)
7	Arrow marking in direction of travel
8	Identification for dimension group
9	Arrow marking in direction of travel
10	Inspection stamp (supplier)

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Piston classification, turbo engine

1	Arrow marking in direction of travel
2	Porsche short numeric code without main or middle number
3	Short numeric code (supplier)
4	Cylinder bank identification (V8 1-4 and 5-8)
5	Marking area for weight group (just one permitted per engine, + or -)
6	Barcode 128 (short numeric code without main group or weight group)
7	Arrow marking in direction of travel
8	Marking for dimension group (just one permitted per engine, in this case x)
9	Marking area for weight group (just one permitted per engine, + or -)
10	Inspection stamp (supplier)

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Radial shaft seal

1	Radial shaft seal (use protection cap for radial shaft seal for fitting; only fit when crankcase is screwed on)
2	Crankcase
3	Crankshaft
4	Radial shaft seal (sectional view)
A	Direction of travel

Fig 3: Pulleys Components Location With Torque Specification

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Pulleys

1	Water pump pulley
2	Screw, M8 x 16 > Tightening torque 23 Nm (17 ftlb.)
3	Vibration damper
4	Screw, M18 x 1.5 x 72; use new screw; > Tightening torque 20 Nm (15 ftlb.) > Tightening torque 50 Nm (37 ftlb.) > Tightening torque 100 Nm (74 ftlb.) > Torque angle 180°
5	Pulley on power-steering pump
6	Screw, M8 x 16 > Tightening torque 23 Nm (17 ftlb.)
7	Tandem pump pulley