- 62 -
FOCS Workshop Manual_cod. 1.5302.351_7° ed_ rev. 06
C**B*A
dtS
029,22÷787,22001,32÷050,32
313,0÷031,0
1
a
021,32÷789,22003,32÷052,32
2
a
022,32÷780,3004,32÷053,32
3
a
023,32÷781,32005,32÷054,32
136
138
137
4
Shoulder half rings, oversized elements
Dimensions (mm):
* A of Fig. 134.
** B of Fig. 135.
Grinding B as per relevant table, you can mount the following half
rings:
1
st
Oversized element Half rings 1 and 2 + 0.10 mm on both sides
of the bearing
2
nd
Oversized element Half rings 1 and 2 + 0.10 mm on one side
of the support and + 0.20 mm on the other
side.
3
rd
Oversized element Half rings 1 and 2 + 0.20 mm on both sides
of the bearing.
Crankshaft front and back oil seal rings
Caution – Warning
An ambient temperature below -35°C may damage the rings.
The front oil seal ring 1 inserted into the oil pump cover and the back
one 2, in the flywheel side flange.
If warped, hardened, or cracked, replace them.
For the replacement:
- Carefully clean the housing
-Keep the ring immersed in engine oil for about half an hour.
-Drive it into its housing with a buffer exercising a uniform pressure
on the whole front surface. Be sure that the two surfaces A and B
meet on the same level.
-Refill the interior hollow with grease and lubricate the seal lip with
thickened oil.
Note: Before major engine overhaul, in case of oil leakage in the
seal area of rings 3 and 4, you can remedy this by replacing
the rings and pushing them about 2 mm deeper with respect
to the previous ones.
If the rings are black it means zones 3 and 4 of the crankshaft
are tempered. In this case it is necessary to remount a ring of
the same colour.
If the rings are brown it means that zones 3 and 4 of the
crankshaft are not tempered. In this case it is necessary to
remount brown coloured rings.
Disassembly / Reassembly
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