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140 ENGINE
GA1-23
Fig.
6 A 1 - 6 2
Checking Ring in Groove
*
4
ENGINE L E .
ENWNE FRONl
ENGIH R I M
)
4531
"A" OIL RING S P A C E R GAP
"C"
2ND COMPRESSION RING GAP
"0"
OIL RING R A I L GAPS
" D T O P COMPRESSION RING G A P
Fig.
6A1-63
Ring Gap Location
e. Install second compression ring expander, then ring
with gaps properly located.
f. Install top compression ring with gap properly located.
9. Proper clearance of the piston ring in its piston ring
groove is very important to provide proper ring action and
reduce wear. Therefore, when fitting new rings, the
clearances between the surfaces of the ring and groove should
be measured (Fig. 6A 1-64). See Specifications.
Fig.
6A1-64
Measuring Ring Groove Clearance
Installation
NOTE: Cylinder bores must be clean before piston
installation. This may be accomplished with a hot water
and detergent wash as necessary. After cleaning, the
bores should be swabbed several times with light engine
oil and a clean dry cloth.
1. Lubricate connecting rod bearings and install in rods
and rod caps.
2. Lightly coat pistons, rings and cylinder walls with
light engine oil.
3. With bearing caps removed, install Tool
J
23627 on
connecting rod bolts.
CAUTION: Be sure nng gaps are properly
positioned as previously outlined.
4. Install each connecting rod and piston assembly in its
respective bore. Install with " F on piston facing front of
engine (Fig. 6A1-65). Use Tool
J
8910 to compress the rings
(Fig. 6Al-66). Guide the connecting rod into place on the
crankshaft journal with Tool
J
23627. Use a hammer handle
and light taps to install the piston into the bore (Fig. 6A1-67).
Hold the ring compressor firmly against the cylinder block
until all piston rings have entered the cylinder bore (Fig. 6A1-
67).
5. Remove Tool
J
23627.
6. Install the bearing caps and torque nuts to 35 lbs. ft.
NOTE: If bearing replacement is required refer to
"Connecting Rod Bearings".
Be sure to install new pistons in the same cylinders for
which they were fitted, and used pistons in the same cylinder
from which they were removed. Each connecting rod and
bearing cap should be marked, beginning at the front of the
engine. The numbers on the connecting rod and bearing cap
must be on the same side when installed in the cylinder bore.
If a connecting rod is ever transposed from one block or
cylinder to another, new bearings should be fitted and the
connecting rod should be numbered to correspond with the
new cylinder number.
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