Jeep Liberty KJ. Manual — part 894
•
Cylinder head covers (Refer to 9 - ENGINE/CYLINDER HEAD/CYLINDER HEAD COVER(S) - INSTALLA-
TION).
•
Oil pan and gasket/windage tray. (Refer to 9 - ENGINE/LUBRICATION/OIL PAN - INSTALLATION).
12. Fill crankcase with proper engine oil to correct level.
13. Connect negative cable to battery.
9 - 1534
ENGINE - 3.7L
KJ
RINGS-PISTON
STANDARD PROCEDURE - PISTON RING FITTING
Before reinstalling used rings or installing new rings,
the ring clearances must be checked.
1. Wipe the cylinder bore clean.
2. Insert the ring in the cylinder bore.
NOTE: The ring gap measurement must be made
with the ring positioned at least 12mm (0.50 inch.)
from bottom of cylinder bore.
3. Using a piston, to ensure that the ring is squared in
the cylinder bore, slide the ring downward into the
cylinder.
4. Using a feeler gauge (1) check the ring end gap.
Replace any rings not within specification.
PISTON RING SIDE CLEARANCE
NOTE: Make sure the piston ring grooves are
clean and free of nicks and burrs.
5. Measure the ring side clearance as shown make sure the feeler gauge (1) fits snugly between the ring land and
the ring. Replace any ring not within specification.
6. Rotate the ring around the piston, the ring must rotate in the groove with out binding.
PISTON RING SPECIFICATION CHART
Ring Position
Groove Clearance
Maximum Clearance
Upper Ring
.051-.094 mm
0.11 mm
(0.0020-.0037 in.)
(0.004 in.)
Intermediate Ring
0.04-0.08 mm
0.10 mm
(0.0016-0.0031 in.)
(0.004 in.)
Oil Control Ring
.019-.229 mm
.25 mm
KJ
ENGINE - 3.7L
9 - 1535
Ring Position
Groove Clearance
Maximum Clearance
(Steel Rails)
(.0007-.0090 in.)
(0.010 in.)
Ring Position
Ring Gap
Wear Limit
Upper Ring
0.20-0.36 mm
0.43 mm
(0.0079-0.0142 in.)
(0.0017 in.)
Intermediate Ring
0.37-0.63 mm
0.74 mm
(0.0146-0.0249 in.)
(0.029 in.)
Oil Control Ring
0.025-0.76 mm
1.55 mm
(Steel Rail)
(0.0099- 0.03 in.)
(0.061 in.)
7. The No. 1 and No. 2 piston rings have a different
cross section. Ensure No. 2 ring is installed with
manufacturers I.D. mark (Dot) facing up, towards
top of the piston.
NOTE: Piston rings are installed in the following
order:
•
Oil ring expander.
•
Upper oil ring side rail.
•
Lower oil ring side rail.
•
No. 2 Intermediate piston ring.
•
No. 1 Upper piston ring.
8. Install the oil ring expander.
9. Install upper side rail (1) by placing one end
between the piston ring groove and the expander
ring. Hold end firmly and press down the portion to
be installed until side rail is in position. Repeat this step for the lower side rail.
10. Install No. 2 intermediate piston ring using a pis-
ton ring installer.
11. Install No. 1 upper piston ring using a piston ring
installer.
9 - 1536
ENGINE - 3.7L
KJ
12. Position piston ring end gaps as shown. It is
important that expander ring gap (5) is at least
45° from the side rail gaps, but not on the piston
pin center or on the thrust direction.
KJ
ENGINE - 3.7L
9 - 1537
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