PRE-RELEASE
Pistons
| Pistons |
| General data |
|
Average piston speed at 5000 rpm
|
m/s
|
16.3
|
|
Different makes of piston must not be fitted in the same engine.
|
||
| Piston types |
| Classification of pistons and cylinder bores |
Piston class is stamped into the piston crown roof. The piston classes are
8 99 00
01
02 cylinder class is stamped on the cylinder plane and specified for each cylinder. The cylinder classes are
8 99 00
01
02 All classes can be found on the same cylinder block.
| Piston classification |
|
8
|
mm
|
84
|
| Piston rings |
|
|
|
Upper compression ring
|
Lower compression ring
|
Scraper ring
|
|
Thickness
|
mm
|
2.00
|
1.75
|
3.00
|
|
Side clearance in groove
|
mm
|
0.02-0.04
|
0.02-0.04
|
0.01-0.03
|
|
Working gap in cylinder
|
mm
|
0.30-0.50
|
0.30-0.50
|
0.40-1.40
|
The piston ring opening should be offset 120°
| Gudgeon pin |
|
Diameter
|
mm
|
29
|
|
Length
|
mm
|
68
|
|
Gudgeon pin in relation to connecting rod
|
mm
|
Floating bearing
|
