Connecting rod half shells
NoteThe operating clearance of the rods, between 0,030 and 0,054 mm, is obtained by the creation of 3 categories of conrod half shells (big end caps side)
Upper conrod half-shell
There is only one category for upper conrod half-shells fitted with a lubrication hole
| description | nominal dimension |
|---|---|
| distance (B) | 1,839 ± 0,003 mm |
| colour identification (b) | black |
Lower conrod half-shell
The conrod half-shell categories are shown on the conrod (lug side) at (f) and on the crankshaft (engine flywheel side) at (e)
The lower conrod half-shell categories are determined by measuring the bearings
H = bar code used in plant
G = characters read on the crankshaft (in service)
The first character corresponds to bearing no 1, the second to bearing no 2 and so on
NoteThe big end caps are marked from 1 to 4, big end cap no. 1 engine flywheel side
Example
- Characters read on the crankshaft: 37BF
- Raised character on conrod no. 1: F
- Raised character on conrod no. 2: C
For bearing no. 1 - (3F): the lower half shell to be fitted is category 2
For bearing no. 2 - (7C): the lower half shell to be fitted is category 1
NoteProceed in the same way for the 2 other assemblies
| zone | 1 | 2 | 3 |
|---|---|---|---|
| distance (A) (mm) | 1,830 ± 0,003 | 1,839 ± 0,003 | 1,848 ± 0,003 |
| colour identification (a) | blue | black | Green |
| zone | 11 | 12 | 13 | 14 |
|---|---|---|---|---|
| distance (A) (mm) | 1,831 ± 0,003 | 1,838 ± 0,003 | 1,845 ± 0,003 | 1,852 ± 0,003 |
| colour identification (a) | blue | black | Green | grey |
NoteIf the measuring equipment is faulty, fit category 11 lower half-shells; this practice must only occur in exceptional cases, since the engine may prove to be noisy
Half-shells on crankshaft bearing
The operating tolerance of the crankshaft bearings is obtained by the creation of several categories of half-shells (see the table below)
- 3 categories of upper half-shells (cylinder block side)
- 8 categories of lower half-shells (on the main bearing cap side)
| build number | up to build code 107214 | between build numbers 107215 and 174878 | from build code 174879 |
|---|---|---|---|
| Type of assembly (*) | 2 + 4 | 2 + 4 | 1 + 5 |
(*): Number of categories of upper half-shells plus number of categories of lower half-shells
Top half shells (grooved)
| description | nominal dimension | nominal dimension | nominal dimension |
|---|---|---|---|
| distance (C) | 1,854 ± 0,003 mm | 1,861 ± 0,003 mm | 1,859 ± 0,003 mm |
| colour identification (c) | blue | black | yellow |
| Assembly of the half-shell on the bearing | 2-3-4 (2 + 4) | 1-5 | 1-2-3-4-5 |
| Type of assembly | 2 + 4 | 2 + 4 | 1 + 5 |
Bottom half shells (smooth)
The crankshaft bearing half-shell categories are shown on the engine block at (j) and on the crankshaft (timing side) at (i)
L = bar code used in plant
K = spray slip compound into the housing before refitting
The first character corresponds to bearing no 1, the second to bearing no 2 and so on
NoteThe crankshaft bearings are marked from 1 to 5, No. 1 at flywheel end
All engines since the series launch up to the manufacturing serial no. 174878: the operating clearance of the crankshaft main bearings, between 0,019 and 0,049 mm, is obtained by the creation of 4 categories of lower smooth half shells (cap side)
Example
- Characters read on the crankshaft: A7H6D
- Characters on the cylinder block: EPTG6
For bearing no. 1 - (AE): the lower half shell to be fitted is category F
For bearing no. 2 - (7P): the lower half shell to be fitted is category G
NoteProceed in the same way for the 3 other assemblies
| zone | D | E | F | G |
|---|---|---|---|---|
| distance (D) (mm) | 1,841 ± 0,003 | 1,850 ± 0,003 | 1,858 ± 0,003 | 1,867 ± 0,003 |
| colour identification (d) | blue | black | Green | red |
NoteIf the measuring equipment is faulty, fit category D lower half-shells; this practice must only occur in exceptional cases, since the engine may prove to be noisy
All engines from manufacturing number 174879: the operating clearance of the crankshaft main bearings, between 0,019 and 0,049 mm, is obtained by the creation of 5 categories of lower smooth half shells (cap side)
| zone | H | I | J | K | L |
|---|---|---|---|---|---|
| distance (D) (mm) | 1,846 ± 0,003 | 1,853 ± 0,003 | 1,858 ± 0,003 | 1,864 ± 0,003 | 1,870 ± 0,003 |
| colour identification (d) | blue | black | Green | orange | brown |
Thrust washers
The crankshaft lateral play is adjusted by thrust washers on bearing no. 2
The crankshaft lateral play is between 0,06 and 0,15 mm
Nominal dimension: E = 2,28 mm - 2,33 mm
NoteThe engine sequence between production numbers 0139265 and 0146012 has an assembly of special thrust washers with extra height