Pistons
| Pistons |
| Piston diameter |
Piston diameter is measured at right angles to the gudgeon pin hole, 16 mm from the bottom of the piston.
| Important | ||
|
New pistons are graphite coated, but the coating is not included in the measurement below. |
||
Classification codes
|
8
|
mm
|
81.540-81.550
|
|
99
|
mm
|
81.550-81.560
|
|
00
|
mm
|
81.560-81.570
|
|
01
|
mm
|
81.570-81.580
|
|
02
|
mm
|
81.580-81.590
|
|
Piston clearance, nominal
|
mm
|
0.025-0.045
|
Oversizes
|
7 + 0.5
|
mm
|
82.030-82.040
|
|
8 + 0.5
|
mm
|
82.040-82.050
|
|
9 + 0.5
|
mm
|
82.050-82.060
|
|
0 + 0.5
|
mm
|
82.060-82.070
|
| Piston rings |
|
|
|
Upper
compression ring |
Lower
compression ring |
Scraper ring
|
|
Thickness
|
mm
|
1.478-1.490
|
1.478-1.490
|
3.0
|
|
Working gap in cylinder
|
mm
|
0.30-0.50
|
0.30-0.50
|
0.40-1.40
|
| Gudgeon pin |
|
Diameter
|
mm
|
20.990-21.000
|
|
Gudgeon pin in relation to connecting rod
|
mm
|
18 ± 5
|
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