Assigning a standard dimension piston to a cylinder bore - AR03.10-P-7021-02L
MODIFICATION NOTES
| 15.8.08 | Note for determination of valid measurement for a cylinder bore - added | Step 1 |
TEST SPECIFICATIONS FOR PISTONS
| Number | Designation | Engine 137.970 | ||
|---|---|---|---|---|
| BE03.10-P-1001-02E | Piston dia. Ø | Default | mm | 83.975 to 84.003 |
| Auxiliary stage | mm | 84.025 to 84.053 | ||
| BE03.10-P-1002-02E | Piston clearance | Default | mm | ≤ 0.04 |
| Auxiliary stage | mm | ≤ 0.04 | ||
TEST SPECIFICATIONS FOR PISTONS
| Number | Designation | Engine 275.950/951/953/954, 285.950 | Engine 275.98, 285.98 | ||
|---|---|---|---|---|---|
| BE03.10-P-1003-02F | Piston Ø | Standard Step markings X | mm | 81.970 to 82.008 | 82.563...82.575 |
| Step marking ⓧ | mm | 82.020 to 82.058 | 82.613 to 82.625 | ||
| BE03.10-P-1004-02F | Piston clearance | Default | mm | 0.04 | - |
TEST SPECIFICATIONS FOR CYLINDER BORE
| Number | Designation | Engine 137.970 | Engine 275.950/951/953/954, 285.950 | ||
|---|---|---|---|---|---|
| BE01.40-P-1001-01G | Cylinder dia. | Standard marking X | mm | 84.000 to 84.015 | 82.000 to 82.015 |
| Auxiliary stage marking ⓧ | mm | 84.050 to 84.065 | 82.050 to 82.065 | ||
TEST SPECIFICATIONS FOR CYLINDER BORE
| Number | Designation | Engine 275.98 285.98 | ||
|---|---|---|---|---|
| BE01.40-P-1001-01G | Cylinder dia. | Standard marking X | mm | 82.600 to 82.615 |
| Auxiliary stage marking ⓧ | mm | 82.650 to 82.665 | ||
- Assign piston to the cylinder bore
Measurement values for the cylinder bore are only valid with a screwed on lower crankcase section.
The cylinder bore diameter is specified in two tolerances. The two tolerances of the cylinder bore diameters are distinguished by the letters x and ⓧ.
This marking is located at the bottom right on the crankcase at the mount for the engine support.
The piston diameters result from the tolerances (standard, auxiliary stage) of the cylinder bore diameters and do not have a marking of their own. If necessary, the piston diameter can be read off on the piston crown.
No piston with a standard diameter in should be installed in a cylinder bore with identification ⓧ to avoid engine damage. This can result in the following combinations:
- Piston with standard diameter in cylinder bore with standard diameter (marking x)
- Piston with auxiliary diameter in cylinder bore with auxiliary diameter (identification marking ⓧ).