WORKSHOP MANUAL - lombardini service

4
Disassembly / Reassembly
Crankshaft front and back oil seal 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.
117
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.
Crankshaft, lubrication lines
Caution – Warning
During repairs, when compressed air is used it is important to
wear protective goggles.
Put the crankshaft in a bath of crude oil.
Use compressed air to clean the inside of the lines.
Reposition the new caps in their seating and check the seal.
118
Crankshaft, check journals and crank
Use a micrometer for the outsides.
119 120
- 50 - FOCS Workshop Manual_cod. 1.5302.858_1° ed_ rev. 00