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ENGINE: PISTONS· CONNECTING RODS
41
Use care to turn in the pin screw just a fraction
to avoid that
it
may be overtightened as a result
of piston pin expanding in touch with a hot connect-
ing
rod.
2) Recall that the piston does not present a
symmetrical design and therefore there is a fixed
installing position for this part: the connecting rod
number should be on the opposite side to the
piston skirt class letter and boss division number
which are stamped on piston boss base (fig. 54).
3) Clamp the connecting rod in a vise.
im-
mediately after withdrawing it from the oven.
Place the piston on to the connecting rod, so to
line up the pin boss
with
the small end eye. Use
care
that
the piston is positioned as outlined earlier.
Grab the tool A. 60275. to which the piston pin
has
been attached, as per item I), and drive the
pin into the boss and small end bore until the
shoulder of the tool abuts against the boss face
(fig. 55).
Fig. 53 - Location of connecting rods in oven.
During this operation the piston should be
brought horizontally to abut against the small end,
so as the pin boss contacts the small end eye (fig. 55).
The pin will slide thus into seat without difficulty.
Checking Piston Pin Drag.
After the connecting rod, piston and pin have
been assembled, check the piston pin against
slide resistance using a torque wrench and fixture
A. 95605.
As
shown in fig. 56, fixture A. 95605 consists of
a holder (I), which is the same as used for pin
removal, a threaded rod (9) and a dial indicator
with clamp (4, 5).
Fig. 54 - Position of piston to connecting rod.
1. Piston skirt class letter and piston boss division number.
2. Connecting rod number. - 3. Oil hole.
Proceed as follows:
I) Clamp the fixture holder (5, fig. 57) in a
vise and affix the connecting rod-piston-pin as-
sembly to the holder.
2) Lower the indicator clamp (2), slide the
threaded rod (6) through the pin hole and into the
holder until the rod end (7) abuts against the pin
face.
Screw the rod end nut (4) all the way down, so
to take up any play of the rod to the fixture holder.
3) Raise the clamp of the dial indicator (2)
horizontal, stop
it
with the pressure screw (3) and
Fig. 55 - The piston pin will be installed correctly when the
shoulder of tool A. 60275 abuts against the piston boss.
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