Hudson 1955 Rambler, Техническое и сервисное руководство

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8
E N G I N E V - 8
FIGURE 20— Measuring Clearance at Bottom
of Piston Skirt
PISTON RINGS
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
must be cleared with the proper size drill.
Care must be exercised not to remove metal
from the grooves, since that will change
their depth, nor from the lands, since that
will change the ring groove clearance and
destroy ring to land seating.
Checking Ring Groove Clearance
Side clearance between land and piston ring
should be .0015" to .005". Roll the ring
around the groove in which it is to operate.
It must fit freely at all points.
Checking Ring Gap Clearance
Piston ring gap or joint clearance is
measured in the bottom of the cylinder near
the end of the ring travel area. To square
the ring in the bore for checking joint
clearance, place the ring in the bore. Then
with an inverted piston, push the ring down
near the lower end of the ring travel area.
FIGURE 21— Burnishing Piston Pin Bushing
When other than standard ring sizes are used,
rings should be individually fitted to their
respective bores for a gap clearance of .010"
to .018".
Piston Ring Installation
Removal of glaze from the cylinder wall for
quicker ring seating can be accomplished by
various methods. Where an expanding type hone
is used, do not use more than ten strokes
(each stroke down and return) to recondition
a cylinder wall.
Successful ring installation depends upon
cleanliness in handling parts and while
honing the cylinder walls. The engine bear-
ings and lubrication system must be protected
from abrasives.
Rigid type hones are not to be used to
remove cylinder glaze as there is always a
slight amount of taper in cylinder walls
after the engine has been in service.
Rings must be installed on the pistons
with a ring installing tool to prevent
distortion and ring breakage.
For service ring replacement, follow the
detailed instructions enclosed in the ring
package.
Prior to installing the piston and con-
necting rod assembly into engine, the piston
ring gaps are to be