1956 AMC Hudson Technical Service Manual Supplement

10 TECHNICAL SERVICE MANUAL
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.
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 bearings 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 connecting rod assembly
into engine, the piston ring gaps are to be arranged so
that the gap for the oil ring is toward the inside of the block.
The gaps on the compression rings are 120° apart. Do not
locate a ring gap over the piston pin boss.
CONNECTING RODS
FIGURE 15—Piston Ring Location
Checking Ring Groove Clearance
Side clearance between land and piston ring should be:
No. 1 ring groove .002"-.0035"
No. 2 ring groove .002"-.004"
No. 3 ring groove .001"-.0079"
Piston ring width is:
No. 1 chrome plated .0775"-.0780" wide
No. 2 plain
.0770"-.0780" wide
No. 3 oil control ring is a three-piece type (two oil
control wiper rails with a spacer of segmented
steel between them).
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.
When other than standard ring sizes are used, rings
should be individually fitted to their respective bores for a
gap clearance of:
No. 1 . 010"-.020"
No. 2 . 010"-.0201'
No. 3 . 015"-.055" (Gap of Rail)
Connecting rods are the "I" beam drop forged steel type. The
connecting rods are stamped with the cylinder numbers in
which they are assembled. The numbers are opposite the
squirt holes and toward the outside of the banks in which
they are located.
The squirt holes from connecting rods in one bank lubricate
the cylinders in the opposite bank.
The connecting rod squirt holes are located in the parting
surface of the bearing cap (Fig. 16).
FIGURE 16—Connecting Rod Squirt Hole Location