1956 AMC Hudson Technical Service Manual Supplement

ENGINE V-8 9
The piston pin boss is "offset" from the piston center line
to place it nearer the thrust side of the cylinder. To insure
proper installation of the piston in the bore, a notch is cast
in the piston top, and letters "F" cast in the pin boss structure
at the front (Fig. 12).
FIGURE 11—Removing Piston Pin
1. Notch and "F" Letter to Front of Engine
FIGURE 12—Correct Piston Position
The piston to bore clearances are .020" to .024" at top
land, .001" to .0015" top of skirt, and .0009" to .0015"
bottom of skirt.
PISTON PINS
The piston pins are a press fit into the connecting rod, thus
requiring no locking device.
The piston pin is removed with piston pin remover j-6360
and an arbor press. The piston is placed on the remover
support so that the pin will enter the support when pressed
out with the piloted driver.
To install the piston pin, place the piston pin pilot in the
support and insert in piston and connecting rod. This aligns
the piston and connecting rod piston pin bores. Press the
piston pin into the connecting rod and piston assembly until
the lower pilot bottoms in the support. The connecting rod
is automatically centered on the pin (Figs. 13 and 14).
CAUTION: The pin must be a tight press
fit in the connecting rod.
The piston pin should be a palm press fit in piston boss at
room temperature. With parts dry and free of oil, the pin
must support its weight in a vertical position, over its entire
length, in either of the two piston pin bosses.
FIGURE 13—Removing Piston Pin
PISTON RINGS
FIGURE 14—Installing Piston Pin
A three ring piston is used. The two compression and one oil
control rings are located above the piston pin boss.
Before assembling the rings to the piston, carbon must be
cleaned from all ring grooves. The oil drain holes in the oil
ring grooves and pin boss must be cleared with the proper
size drill. Care must be exercised not to remove metal from