Jeep Cherokee 2000 Service Manual - page 768
(5) The oil control rings are symmetrical, and can
be installed with either side up. It is not necessary to
use a tool to install the upper and lower rails. Insert
oil rail spacer first, then side rails.
(6) The two compression rings are different and
cannot be interchanged. The top compression ring
can be identified by the shiny coating on the outer
sealing surface and can be installed with either side
up. (Fig. 24).
Fig. 19 Moly Coated Piston
1 – MOLY COATED
2 – MOLY COATED
Fig. 20 Bore Gauge
1 – FRONT
2 – BORE GAUGE
3 – CYLINDER BORE
4 – 49.5 MM (1–15/16 in)
PISTON SIZE CHART
CYLINDER BORE SIZE
PISTON LETTER SIZE
98.438 - 98.448 mm
(3.8755 - 3.8759 in.)
A
98.448 - 98.458 mm
(3.8759 - 3.8763 in.)
B
98.458 - 98.468 mm
(3.8763 - 3.8767 in.)
C
98.468 - 98.478 mm
(3.8767 - 3.8771 in.)
D
98.478 - 98.488 mm
(3.8771 - 3.8775 in.)
E
98.488 - 98.498 mm
(3.8775 - 3.8779 in.)
F
Fig. 21 Piston Dimensions
9 - 78
4.0L ENGINE
XJ
SERVICE PROCEDURES (Continued)