Hudson 1955 Rambler, Technical & Service Manual

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E N G I N E 6 C Y L I N D E R
9
FIGURE 21— Tool J-1612-3A Tappet Holders
FIGURE 22—Installing Crankshaft Sprocket
"Hornet" and "Wasp" Series
retain tappets with wire.
Remove timing chain cover and oil slinger.
Position engine with timing marks on a
center line (Fig. 12). Remove camshaft
sprocket retaining screw. Remove timing
chain and sprockets. The sprockets can be
pryed off of the shafts.
Remove camshaft thrust plate and camshaft.
Camshaft End Play
The camshaft end play is obtained between
the front surface on the camshaft bearing
and the camshaft thrust plate. When exces-
sive end play occurs, a change in thrust
plate will restore the correct end play.
End Play: .003"-.005" "Hornet" and "Wasp"
Series .004"-.006" "Rambler" Series
The camshaft end play can be checked with a
feeler gauge between the rear of the camshaft
sprocket and the front surface of the
camshaft thrust plate. A dial indicator can
also be used for checking the end play of the
camshaft.
PISTONS
"Hornet" and "Wasp" Series
The pistons are aluminum alloy cam ground
with taper ground skirt.
Ring grooves are provided for four piston
rings, two compression and two oil control
rings. One oil control ring is installed
below the piston pin while two compression
rings and one oil control ring are above the
pin. The rings are positioned and retained
in a limited working area by pins installed
in the piston ring grooves.
"Rambler" Series
The pistons are aluminum alloy cam ground
having a larger diameter measured at right
angles to the piston pin hole and taper
ground skirt. A steel strut for structural
strength and to control expansion is located
in the pin boss structure.
Ring grooves are provided for four rings
above the piston pin, two compression and two
oil control rings. The piston pin is off-set
from the center axis toward the thrust side
of the cylinder.
To insure proper installation of off-set pin,
a notch is cast in top of piston. Piston must
be installed in the engine with the notch
toward the front.
Piston Removal
Piston removal is accomplished from the top
of the engine. However, before removing the
pistons, the ring ridges in the cylinder
bores must be removed. Failure to remove the
ridge at the top of the cylinder bore will
very often result in piston ring breakage and
damage to the piston groove land. If cylinder
taper exceeds .009", bore must be trued up
and oversize pistons and rings used.
Fitting Pistons
"Hornet" and "Wasp" Series
The pistons are fitted by the use of a spring
scale and feeler tape for a clearance of
.002" under a three to four pound pull.
(Parts must be clean, dry, and at room
temperature.)
"Rambler" Series
The piston is fitted so that each piston will
support its own weight in any portion of the
cylinder with all parts clean and dry. Piston