Chrysler Concorde 1993 Service Manual page 438

Fig. 4 Checking Cylinder Bore Size
inder 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
Standard 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
12mm (.50 inch) down and bottom measurement
should be 12mm (.50 inch.) up from bottom of bore.
Refer to (Fig. 5) for specifications.
FINISHED PISTONS
Pistons are machined to two different weight speci-
fications and matched to rods based on weight. All
piston and rod assemblies weigh the same, to maintain
engine balance. For cylinder bores which have been
honed, new piston and connecting rod assemblies are
available for service.
FITTING PISTONS
Piston and cylinder wall must be clean and dry.
Piston diameter should be measured 90 degrees to
piston pin at size location shown in (Fig. 6). Cylinder
bores should be measured halfway down the cylinder
bore and transverse to the engine crankshaft center
line shown in (Fig. 4). Refer to (Fig. 5) for specifica-
tions.
Pistons and cylinder bores should be measured
at normal room temperature, 70°F(21°C).
PISTON PINS
The piston pin is full floating and is held in place by
lock rings. Pistons and rods are weight matched for
balance. Do Not switch pistons with other rods .
Piston and Rods are serviced as an assembly for
balance.
Fig. 5 Cylinder Bore and Piston Specifications
Fig. 6 Piston Measurements
FITTING RINGS
(1) Wipe cylinder bore clean. Insert ring and push
down with piston to ensure it is square in bore. The
ring gap measurement must be made with the ring
positioning at least 12mm (.50 inch) from bottom of
cylinder bore. Check gap with feeler gauge (Fig. 7).
Refer to specifications (Fig. 8).
(2) Check piston ring to groove clearance: (Fig. 9).
Refer to specification (Fig. 8).
Fig. 7 Check Gap on Piston Rings
3.5L ENGINE 9 - 55