CHRYSLER SERVICE MANUAL
ENGINE—167
The crankshaft, bearings and internal parts
should be protected during honing and boring
operations. Usually one or two "passes" with
a hone will clean up a bore and still maintain
required limits.
If cylinder bores are found to be satisfactory
in respect to taper and out-of-round and new
rings are to be installed, use Cylinder Surfac-
ing Hone Tool C-3501 with 280 grit stones for
deglazing bores. This will facilitate in the
break-in of new rings.
CAUTION
Be sure all abrasives are removed from engine
parts after honing. It is recommended that a
solution of soap and water be used with a brush
and then thoroughly dried. If this is impossible
use SAE No. 10 oil and CLEAN rags. When the
bore can be wiped with a clean white rag and
be withdrawn clean, the bore is clean.
Cylinder walls which are badly scored,
scuffed, scratched, or worn beyond specified
limits should be rebored. Whatever type of
boring equipment is used, boring operation
should be closely co-ordinated with the fitting
of pistons and rings, in order that specifica-
tions may be maintained.
d. Fitting Pistons
The piston and cylinder wall must be clean and
dry. Coat the bore very lightly with SAE 10W
Engine Oil. The recommended clearance be-
tween the thrust face of piston and cylinder
wall is .0005 to .0015 inch. Check clearance with
a .002 inch feeler stock y
2
inch wide on spring
scale Tool C-690, by inserting piston in bore, up-
side down, with feeler stock between thrust face
of piston and cylinder wall. Hold piston and
draw the feeler stock straight out with spring
scale (Fig. 43). The amount of pull required to
withdraw the feeler stock should be from 8 to
12 pounds.
NOTE
Piston fitting should be done at normal room
temperature, 70° F.
All service pistons include piston pins and
retaining rings and are available in standard
and the following oversizes, .005, .020, .040 and
.060 inch.
e. Fitting Rings
Measure piston ring gap about two (2) inches
from bottom of cylinder bore in which it is to
be fitted. (An inverted piston can be used to
push the rings down to position.) This will in-
sure positioning rings exactly square with cyl-
inder wall before measuring.
Insert feeler stock in gap (Fig. 44). The
ring gap should be between .010 to .020 inch.
This measurement is the same for all rings.
Measure clearance between piston ring and
ring groove (Fig. 45). The clearance should be
.0015 to .0030 inch for top compression ring,
.001 to .0025 inch for intermediate ring, and
.001 to .003 for oil control ring.
Starting with oil ring expander, place ex-
pander ring in lower ring groove and install
oil control ring. Install compression rings, in
top and middle grooves. Use ring installer,
Tool C-3418.
51x72
51x59
Fig.
43—Fitting Piston to Cylinder Bore (Typical)
Fig.
44—Checking Ring Gap in Cylinder Bore
(Typical)
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