Table of Contents
Advertisement
50
FIAT - 850 PASSENGER CARS
Flg. 16 - Arrangement of calibrated wire on main journal.
1. Piece of «Plastlgage •.• 2. Journal.
- Draw up main bearing cap screws with
44.8 It.lbs (6.2 kgm).
- Remove caps and compare the width of flat-
tened
(I
Plastigage
I)
with the graduation scale on
envelope (fig. 77). The nwnber within Ute gradua-
tion on the envelope indicates the bearing clearance.
The
fitting
clearance of main bearings to journals
is
.0008" to .0024" (0.020 to 0.060 rum).
Fig. 17 • Comparing the width of flattened « PI.stlgage» with
the graduations on the envelope.
1. Flattened calibrated wire. - 2. Clearance reading. - 3. Main Journal.
Should clearance not be within the wear limit of
.004" (0.10 rum) replace bearings by undersizes
(see table).
After
all
necessary checks and replacements
have been completed, fit bearing caps and tighten
screws to the prescribed torque (fig. 79).
The crankshaft rotating freely indicates that it
was installed correctly
with
specified c1eaxance of
bearings to journals.
Checking End Play.
After the crankshaft has been installed, check
Ute end play between Ute intermediate bearing
thrust rings and crankshaft shoulders.
Fig. 78 - Fitting thrust ring halves.
,. Thrust ring halves. - 2. Intermediate main bearing Insert.
Apply the magnetic
dial
indicator and insert two
screwdrivers as shown in fig. 80.
Move the crankshaft axially and note the dial
reading to check that the end play
is within
.0024"
to .0102" (0.06 to 0.26 rum).
Should end play exceed Ute top limit 01 .0138"
(0.35 rum), replace furust rings by .005" (0.127 rum)
oversizes which are supplied for service.
When fitting replacement thrust ring halves. recall
that the grooved face of rings should be toward
the shaft shoulder.
Oil Seals.
During engine rebuild, check to make sure that
crankshaft oil seals at timing geax cover and fly-
wheel end are free of damage and serviceable;
otherwise renew them.
Advertisement
Table of Contents
