Grand Cherokee 2WD L6-242 4.0L VIN S MFI (1993)
NOTE:
MEASURING THE INSIDE DIAMETER OF THE CYLINDER BORE WITH A DIAL BORE GAUGE IS MANDATORY. TO CORRECTLY
SELECT THE PROPER SIZE PISTON, A CYLINDER BORE GAUGE CAPABLE OF READINGS IN .0001" INCREMENTS IS REQUIRED.
5.
Cylinder bore measurement should be made 58.74 mm (25/16 in.) from the top of the bore. Start perpendicular (across or at 90 degrees) to the axis
of the crankshaft and then take two additional, equally spaced (120 degrees), bore readings. Use the minimum bore diameter when selecting the
correct piston size.
6.
Order the new style piston-connecting rod assembly to match the cylinder bore dimension.
7.
If a scuff condition exists, the replacement of the short block assembly is required.
PARTS REQUIRED:
NOTE:
THE ABOVE LIST OF PISTON ASSEMBLIES INCLUDES THE STANDARD SERVICE REPLACEMENT PISTONS COVERED IN THE
RESPECTIVE SERVICE MANUAL.
REPAIR PROCEDURE:
1.
When replacing pistons, follow the procedures listed in the Service Manual except for the following:
