PRE-RELEASE
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 codes | ||
| 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 codes | ||
| 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 | Oil 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 pins |
| Diameter | mm | 29 |
| Length | mm | 68 |
| Gudgeon pin in relation to connecting rod | mm | Floating bearing |
