Cylinder Block Assembly: Specifications
997Cubic capacity 3,614 cm�
Bore 97.0 mm
Stroke 81.5 mm
Compression ratio 12.5: 1 (-0.5)
997 S
Cubic capacity 3,800 cm�
Bore 102.0 mm
Stroke 77.5 mm
Compression ratio 12.5: 1 (-0.6)
997 (MA.102)/997 S (MA.101)
Type 6-cylinder aluminium flat-six engine, water-cooled
Crankcase Vertically split light alloy cylinder housing
Crankshaft Forged, supported by 8 bearings
Crankshaft bearings Plain bearings, dia. 63 mm (2.48 in) Smooth bearings: Cyl. 1/3/5/7/8 Partially grooved bearings: Cyl. 2/6/4
Connecting rods Forged, l = 140 mm
Con-rod bearings Plain bearings
Pistons Pressed light alloy
Cylinders Aluminium silicon cylinder liner surface
Marking for bearing shell allocation on the crankshaft
G - Bearing shell, Yellow
R - Bearing shell, Red
B - Bearing shell, Blue
2.2. Crankcase 1-3: Markings on crankcase half. The series of letters -1- is read from left to right. Allocation starts at the flywheel side and ends at the supporting mount on the belt side.
G - Bearing shell, Yellow
R - Bearing shell, Red
B - Bearing shell, Blue
Marking on crankcase half 1-3
Connecting rod bolts M10 x 1.25 x 51
Initial tightening 20 Nm (15 ftlb.)
Torque angle 80°
Bearing pin securing tensioning rail for oil-pump drive chain
M6, replace O-ring
Tightening torque 10 Nm (7.5 ftlb.)
Bearing pins securing guide and tensioning rails
M6, replace O-rings
Tightening torque 10 Nm (7.5 ftlb.)
Through-bolt screws, Step 1
Replace sealing washers
Initial tightening 5 Nm (3.5 ftlb)
Through-bolt screws, Step 2
Initial tightening 12 Nm (9 ftlb.)
Through-bolt screws, Step 3
Tightening torque 15 Nm (11 ftlb.)
Through-bolt screws, Step 4
Torque angle 75°
Through-bolt screws, Step 5
Final tightening - torque angle 75°
Supporting mount screws External Torx screw, M8 x 35
Initial tightening 5 Nm (3.5 ftlb.)
Torque angle 70°
Cross bolt connection External Torx screw, M8 x 120
Tightening torque 33 Nm (24 ftlb.)
Cross bolt connection External Torx screw, M6
Tightening torque 13 Nm (9.5 ftlb)
Vibration damper to crankshaft M8 X 1 X 25 Outer Torx
Tightening torque 60 Nm (44 ftlb.)