Chrysler neon 1997 Service Manual page 1226

FRONT MIDDLE OF BORE
USE FOR
SIZING
PISTON
PL
SERVICE PROCEDURES
CYLINDER BORE AND PISTON SIZING
The cylinder walls should be checked for out-of-
round and taper with Tool C-119 (Fig. 4). The cylin-
der bore out-of-round is 0.050 mm (.002 inch)
maximum and cylinder bore taper is 0.051 mm (0.002
inch) maximum. If the cylinder walls are badly
scuffed or scored, the cylinder block should be
rebored and honed, and new pistons and rings fitted.
Whatever type of boring equipment is used, boring
and honing operation should be closely coordinated
with the fitting of pistons and rings in order that
specified clearances may be maintained. Refer to
Honing Cylinder Bores outlined in the Stan-
dard Service Procedures for specification and
procedures.
Measure the cylinder bore at three levels in direc-
tions A and B (Fig. 4). Top measurement should be
10 mm (3/8 inch) down and bottom measurement
should be 10 mm (3/8 inch.) up from bottom of bore.
Refer to Cylinder Bore and Piston Specifications
Table.
Fig. 4 Checking Cylinder Bore Size
CYLINDER BORE AND PISTON
SPECIFICATIONS TABLE
Standard Bore Maximum
PISTON
Out-of-Round
87.5 mm (3.445 0.051 mm
in.) (0.002 in.)
Standard Piston Size
87.457 - 87.475 mm (3.4432 - 3.4439 in.)
Piston to Bore Clearance
0.018 - 0.050 mm (0.0007 - 0.0020 in.)
Measurements Taken at Piston Size Location
SIZING PISTONS
Piston and cylinder wall must be clean and dry.
Piston diameter should be measured 90 degrees to
piston pin about 17.5 mm (11/16 inch) from the bot-
tom of the skirt as shown in (Fig. 5). Cylinder bores
should be measured halfway down the cylinder bore
and transverse to the engine crankshaft center line
shown in (Fig. 4). Refer to Cylinder Bore and Piston
Specifications Table. Correct piston to bore clearance
must be established in order to assure quiet and eco-
nomical operation.
Fig. 5 Piston Measurements
Chrysler engines use pistons designed specifically
for each engine model. Clearance and sizing locations
vary with respect to engine model.
NOTE: Pistons and cylinder bores should be mea-
sured at normal room temperature, 21°C (70°F).
2.0L DOHC ENGINE
Maximum
O.D. MENT LOCATION MEASURE-
Taper
0.051 mm
(0.002 in.)
9 - 55