Piston Pins (8-Cylinder) - Jeep 1979 CJ-5 Technical & Service Manual

ENGINES 1B-63
(2) Install lower compression ring using ring in-
staller to expand ring around piston.
N O T E : Be sure upper and lower compression rings are
installed right side up. Figure 1B-101 shows typical ring
markings to indicate the top side of the ring.
(3) Install upper compression ring using ring in-
staller to expand ring around piston (fig. 1B-102).
Fig. 1B-101 Typical Piston Ring Markings
RING
I N S T A L L E R A J 4 1 9 1 4
Fig. 1B-102 Compression Ring Installation
Piston Pins
The piston pins are pressed into the rods with 2000
pounds (907 kg) pressure and require no locking device.
Removal
(1) Using Piston Pin Remover J-21872 and an arbor
press, place piston on Remover Support J-21872-1 (fig.
1B-103).
(2) Use Piloted Driver J-21872-3 to press pin com-
pletely out of piston. Note position of pin through gauge
window of remover support.
Pin Fitting
(1) Inspect pin and pin bore for nicks and burrs.
Replace as necessary.
N O T E : Never reuse piston pin after it has been in-
stalled in and removed from a connecting rod.
Fig. 1 B-103 Piston Pin Removal and Installation
(2) With pin removed from piston, clean and dry
piston pin bore and piston pin.
(3) Position piston so that pin bore is in vertical
position. Insert pin in bore. At room temperature, re-
placement pin should slide completely through pin bore
without pushing.
(4) Replace piston if pin jams in bore.
Installation
(1) Position piston and connecting rod so that piston
notch will face forward and rod squirt hole will face
inward when assembly is installed in engine.
(2) Place Pin Pilot J-21872-2 through piston and
connecting rod pin bores (fig. 1B-103).
(3) Place pin pilot, piston and connecting rod on
Support J-21872-1.
(4) Place piston pin through upper piston pin bore
and into connecting rod pin bore.
(5) Place Piloted Driver J-21872-3 inside piston pin.
(6) Use arbor press to press piston pin through con-
necting rod and piston until pin pilot indexes with mark
on support.
N O T E : The piston pin requires 2000-pounds (907 kg)
pressure for installation. If little effort is required to
install piston pin in connecting rod, or if rod moves
along pin, replace connecting rod.
(7) Remove piston and connecting rod assembly
from press. Pin should be centered in rod ±1/32 inch
(0.787 mm).