Data
| reference | nominal dimension (mm) | repair size (mm) |
|---|---|---|
| height A | 265,23 (± 0,05) | 265,03 (± 0,05) |
| diameter B | 78,5 (+ 0,03; 0) | 78,9 (+ 0,03; 0) |
| max. out-of-true (at "a") | 0,05 | |
| max. out-of-true (at "b") | 0,1 | |
Repair reference
"c" = repair reference: identification R1 engraved on the cylinder block
Grinding the cylinders
WarningFollowing reboring of the cylinders, grind them referring to the paragraphs below
"d" = lift rate measurement location
C = 10 mm
D = 65 mm
E = 125 mm
Angle F = 40 to 60° (Detail of diamond mesh)
Lift rate
To take the following measurements
- Comply with the measurement locations "d"
- Comply with the roughness: between 2 and 4,5
Measuring the lift rate
- In accordance with the current standard E4072 110N - ISO 4288 without mechanical or electrical filtering
- Sensing length = 16 mm
- 3 measurements per cylinder on push side (oil filter side) that is 12 measurements per cylinder block
Lift rate
- G2% - G20% between 1 and 2 microns
- G20% - G81% between 1,5 and 3 microns
- G80% - G98% between 1,5 and 2,5 microns
NoteTwo protrusions are permitted, unless they are detected in the same cylinder. in this case, it is possible to take 7 additional measurements in the faulty cylinder and accept if there is no protrusion
Shape and position tolerance
J = straightness = 0,0055 mm
K = cylindrical shape conformity = 0,009 mm
H = max. surface variation = 0,05 mm
Measuring the hardness
L = measuring zone
M = 50 mm
The hardness in this measuring zone must be between 207 and 241 HB
CHECKING THE CIRCULARITY
R = 60°
Measure the diameters S, N, P, Q in accordance with each dimension C, D, E
| diameter | distance C (mm) | distance D (mm) | distance E (mm) |
|---|---|---|---|
| Ø S | between 78,5 and 78,518 | between 78,5 and 78,518 | between 78,5 and 78,518 |
| Ø N | between 78,5 and 78,518 | between 78,5 and 78,518 | between 78,5 and 78,518 |
| Ø P | between 78,5 and 78,518 | between 78,5 and 78,518 | between 78,5 and 78,518 |
| Ø Q | between 78,5 and 78,518 | between 78,5 and 78,518 | between 78,5 and 78,518 |
NoteMaximum variation between the 12 measurements = 0,018 mm