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74
FIAT·850 PASSENGER CARS
Fig. 127 • Detail of engine side section across centrifugal all
filter.
1. Oil seat disks. - 2. Timing drive sprocket. - 3. Centrifugal oil
flItar hub-pulley. - 4. Baffle ring. - 5.
!C
0)) ring. - 6. Centrifugal filter
cover. - 7. Nut securing hub-pulley and baffle ring to crankshaft. -
8. Spring type oil seal. - 9. Oil pan gasket. - 10. Oil pan. - 11. Oil
seal disk backing ring. - 12. Oil pump delivery pipe. - 13. Front main
bearing cap. - 14. Crankshaft.
14
13
11
11
9
B
ring has been designed to create a radial oil strain
toward an area where centrifugal force is such as
to segregate foreign matter.
Radial ribs on hub-pulley and cover inner face
are to trap foreing matter and convey oil to center
filter.
Oil
from
both sides of front crankshaft end (which
bears two longitudinal machine grooves) is forced
to filter outskirts by the baffle ring. Oil is so cleaned
and returns to filter center whence
if
flows inside
the crankshaft through a passage hole in shank
(fig. 124).
The pulley transmits drive to generator. water
pump and fan.
The nut securing the hub to the crankshaft must
be drawn up with 72.3 ft.lbs (10 kgm) of torque,
using a torque wrench.
Cleaning, Inspection and Repair.
During engine overhaul, or every 30,000 miles
(50,000 km), take the fi14er apart and thoroughly
clean all components.
Check the cover and baffle ring for soundness.
If
signs of crack or distortion are found, re-
place parts affected.
It
is good practice to always renew the gasket
between cover and hub.
After assembly has been completed, reset tension
of generator and water pump drive belt which
should show a deflection of .39" to .59" (10 to IS rom)
under a load of 22 lbs (10 kg).
OIL PRESSURE RELIEF VALVE
This unit is directly screwed in crankcase, on
left lower end.
The valve is set as follows:
- back out the plug performing as a casing for
spring;
- add or remove shims in plug as required;
- screw in plug securely.
Oil pressure. at rated speed, should be 42.7 to
56.9 psi (3 to 4 kg/em
2
).
To check oil pressure, insert test gauge A. 60162
in place of low oil pressure indicator sending unit.
CENTRIFUGAL OIL FILTER
The centrifugal oil filter consists basically of a
cover, a hub-pulley and a baffle ring (see fig. 127).
The bottom bore of the baffle ring is lesser than
that of the cover and hub-pulley. because the baffie
OIL SUMP GASKETS
In order to assure perfect oiltightness, both side
gasket halves and the flywheel end and chain end
gaskets must be fitted on sump as follows:
- using a paintbrush, coat the gasket seats on
sump with cement;
- fit gaskets as shown in fig. 128;
- place tool A. 60163 and secure it to the sump
so that gaskets will adhere closely against seats.
It
is good practice to leave gaskets under pres-
sure of tool A. 60163 for 45 minutes at least.
LOW OIL PRESSURE INDICATOR
SENDING UNIT
The sending unit is located on left hand side of
cylinder block and wired with the low oil pressure
indicator in instrument cluster.
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