Cylinder Bore and Piston Sizing

Figure 3:

The cylinder walls should be checked for out-of round and taper with Tool C-119. The cylinder bore out-of-round is 0.050 mm (0.002 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.
:Standard Service Procedures found under Engine, Service and Repair. Honing Cylinder Bores outlined in the Standard Service Procedures found under Engine, Service and Repair. for specification and procedures.
Measure the cylinder bore at three levels in directions A and B. 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 Chart.

SIZING PISTONS

Figure 4:

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 bottom of the skirt as shown (Fig. 4). Cylinder bores should be measured halfway down the cylinder bore and transverse to the engine crankshaft center line shown. Refer to Cylinder Bore and Specifications Table. Correct piston to bore clearance must be established in order to assure quiet and economical operation.





CYLINDER BORE AND PISTON SPECIFICATION CHART

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 measured at normal room temperature, 21° C (70° F).