Hudson 1955 Rambler, Technical & Service Manual

Page: 34 / 292

E N G I N E V - 8
7
FIGURE 15— Timing Chain Cover Oil Shedder
FIGURE 16— Fuel Pump Drive Eccentric
FIGURE 17— Camshaft Retainer and Thrust
Plate
FIGURE 18— Camshaft End Thrust Spacer
The ring belt area provides for three piston
rings, two compression and one oil control
ring above the piston pin.
The pistons are removed from the top of
cylinder bore after removing ring ridge.
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. 19).
1. Notch and "F" letter to Front of Engine
FIGURE 19— Correct Piston Position
The piston to bore clearances are .021" to
.027" at top land, .001" to .0015" top of
skirt, and .000" to .0015" bottom of skirt
(Fig. 20).
PISTON PINS
Full floating type piston pins are mounted
in a split bronze bushing at the connecting
rod upper end and retained by lock rings in
piston pin bosses. Prior to fitting a new
piston pin, the bronze connecting rod bushing
is pressed into place and burnished with
components of tool J-6055 (Fig. 21). Be sure
oil hole in bushing lines up with oil hole
drilled in rod.
The burnishing operation is required to
prevent the bushing from turning in the rod
end while honing or reaming to fit piston
pin.
The piston pin should be a palm press fit
in rod bushing at room temperature and a palm
press fit in a piston heated in water to
about 200°F. When pin is properly fitted to
rod, rod will fall by its own weight when
located in a horizontal position and held by
the piston pin.