Table of Contents
Advertisement
42
FIAT· 850 PASSENGER CARS
Fig. 56.
Fixture A. 95605 for checking piston
pin
drag.
1. Holder.
~
2. Dial Indicator clamp
pin. - 3. Clamp pressure screw.• 4. Dial
indicator clamp. - 5. Dial indicator. -
6. Dial indicator plunger.• 7. Rod end .•
8. Holder head, housing the connect-
ing rod piston and pin assembly. •
9. Threaded rod. - 10. Rod stop pin.•
11. Rod nut.
rest the plunger (8) of the indicator (I) at the end
(7)
of the rod in the pin hole.
Set the indicator pointer at zero and working
on the stop knob (3) set the stop pin into the rod
spline to hold the rod s.tationary.
4) Apply a torque wrench on the rod nut and
draw it up with 9.4 It.lbs (1.3 kgm) of torque, which
corresponds to an axial load of 882 lbs (400 kg).
The piston pin-connecting rod fit will be correct
if, as the action of the torque wrench ceases and the
rod nut is turned out to its original position (start
in),
the
dial
needle moves back to zero reading
from the position taken under the test load.
Should piston pin ride loose
in
small end, replace
the connecting rod
by
a new one because there
is not the press fit as specified.
Now, prior to fitting the piston, pin and connect-
ing rod assembly to engine, proceed as follows:
- Using fixture Ap. 5051. check the assembly
for misaligrunent as shown in
fig.
59. Minor distor-
ions of connecting rod stem can be corrected by
means of bending bar A. 60189.
- Oil piston pin through holes in piston bosses.
- Install the assembly with the connecting rod
identification number facing the side opposite the
camshaft (fig. 61).
WARNING
w
Connecting rod yokes and caps are
identified in production with a number stamping
to show the cylinder to which rods should be paired.
When installing new connecting rods, use care
to always stamp such pairing number with cylinder.
Connecting Rod Bearings.
Examine the internal face of rod bearing inserts:
if light scratches are noticed, remove them using
an extremely refined grinding wheel. Should deep
Fig. 51.
Arranging connecting rod, piston and
pin assembly on fixture A. 95605 for
drag test of piston pin.
1. Dial indicator set at zero. - 2. Dial in-
dicator clamp. - 3. Clamp pressure screw.
- 4. Rod nut. • 5. Holder. - 6. Threaded
rod. - 1. Rod end in touch with piston
pin. - 8. Indicator plunger In touch with
rod end.
Advertisement
Table of Contents
