Pistons
| Pistons |
| General data |
|
Mean 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 |
The piston classification is stamped on the piston crown roof. Piston classifications are
|
Classification markings
|
||
|
8
|
mm
|
83.975 - 83.985
|
|
99
|
mm
|
83.915 - 83.925
|
|
00
|
mm
|
83.925 - 83.935
|
|
01
|
mm
|
83.935 - 83.945
|
|
02
|
mm
|
83.945 - 83.955
|
The cylinder classification is stamped on the cylinder face and is specified for each cylinder. The cylinder classifications are:
|
Classification markings
|
|
|
|
8
|
mm
|
83.975-83.985
|
|
99
|
mm
|
83.985-83.995
|
|
00
|
mm
|
83.995-84.005
|
|
01
|
mm
|
84.005-84.015
|
|
02
|
mm
|
84.015-84.025
|
| 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
|
They can all occur in the same cylinder block.
The piston ring working gaps must be displaced 120° to each other
| Gudgeon pin |
|
Diameter
|
mm
|
29
|
|
Length
|
mm
|
68
|
|
Gudgeon pin to connecting rod
|
mm
|
Floating bearing
|
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