Measuring, Boring and Honing Cylinder Bores
NOTE: For additional information on the C36 model not specifically listed below refer to AMG.
Measuring
Measure the cleaned cylinder bores with an internal measuring instrument at the 3 measuring points (1, 2 and 3) in the longitudinal and transverse directions.
Average Peak-To-Valley Height (Hz) (see footnote [2]): 0.003 - 0.006 mm
Chamfering Of Cylinder Bores: (see footnote [3])
Honing Angle: 50 ± 10°
Permissible Deviation Of:
Cylinder Shape:
New: 0.007 mm
Wear Limit: 0.05 mm
Rectangularity Related To Cylinder Height: 0.05 mm
Waviness (Wt): 50% Of Peak-To-Valley Height
Wear Limit In:
Direction Of Travel: 0.10 mm
Transverse Direction: 0.10 mm
Piston Allocation Table C280, E320, S320 and SL320 Models:
Standard Diameter 89.9 mm:
Group No. (see footnote [1]):
A:
Cylinder Diameter: 89.900 - 89.906 mm
Piston Diameter: 89.873 - 89.879 mm
X:
Cylinder Diameter: 89.906 - 89.912 mm
Piston Diameter: 89.878 - 89.886 mm
B:
Cylinder Diameter: 89.912 - 89.918 mm
Piston Diameter: 89.885 - 89.891 mm
1st Repair Size + 0.25 mm:
Group No. (see footnote [1]):
A:
Cylinder Diameter: 90.150 - 90.156 mm
Piston Diameter: 90.123 - 90.129 mm
X:
Cylinder Diameter: 90.156 - 90.162 mm
Piston Diameter: 90.128 - 90.136 mm
B:
Cylinder Diameter: 90.162 - 90.168 mm
Piston Diameter: 90.135 - 90.141 mm
2nd Repair Size + 0.5 mm:
Group No. (see foot note [1]):
A:
Cylinder Diameter: 90.400 - 90.406 mm
Piston Diameter: 90.373 - 90.379 mm
X:
Cylinder Diameter: 90.406 - 90.412 mm
Piston Diameter: 90.378 - 90.386 mm
B:
Cylinder Diameter: 90.412 - 90.418 mm
Piston Diameter: 90.385 - 90.391 mm
[1]: The group code letters are located on the piston crown and are stamped in the contact surface of the crankcase.
[2]: After ceramic final honing.
[3]: When performing repairs, all the cylinder bores should be finished to the sizes of the existing pistons in accordance with the allocation table.
Piston Allocation Table AMG C36 Model:
Standard Diameter 91.000 mm
Cylinder Diameter: 90.985 - 91.015mm
Piston Diameter: 90.914 - 90.926 mm
1st Repair Size + 0.50 mm
Standard Diameter 91.500 mm
Cylinder Diameter: 91.485 - 91.515 mm
Piston Diameter: 91.414 - 90.426 mm