Connecting Rod Bearings; Installing Piston In Cylinder; Raised Notch Location - Jeep J-10 Series 1982 Technical & Service Manual

1B-20 ENGINES
80050
.-. Flfj. 1B-31 Installing Piston In Cytlnder
(2) Position connecting rod in its original piston so
that raised notch side of rod (fig. 1B-32) at bearing end is
180 degrees opposite notches in top of piston when
installed.
(3) Position piston and rod on support, and insert
pilot through piston and rod. Note positions of notches.
(4) Place support on arbor press, start pin into posi
tion and press on installation tool until guide bushing
bottoms (fig. 1B-30).
(5) Remove installation tool and support assembly
from piston and connecting rod assembly.
(6) Inspect piston pin for freedom of movement in
piston bore.
(7) Install piston rings with appropriate installation
tool. Refer to Piston Ring Installation for procedure.
Iistallatloi
(1) Install Connecting Rod Bolt Guide Set J-6305-11
on connecting rod bolts.
(2) Using appropriate piston ring compressor, in
sert rod and piston assembly into cylinder so that
notches in top of piston is facing front of engine (fig. 1B-
31).
(3) From beneath engine, position connecting rod
with upper bearing insert in place against journal.
(4) Remove Guide Set J-6305-11 and install lower
bearing insert and cap. Tighten capnuts with 30 foot
pounds (40 N»m) torque.
(5) Install oil pan.
(6) Install cylinder head, intake manifold and ex
haust manifold.
(7) Connect fuel pipe and vacuum hoses to
carburetor.
(8) Install push rods, place rocker arms in position
and tighten rocker arm nuts. Do not over tighten nuts.
(9) Install cvlinder head cover.
90873
Fig. 1B-32 Raised Notch Location
Connecting Rod Bearings
The connecting rod bearings are the precision insert
type and should be replaced if the clearances are exces
sive. Service bearings are available in standard size,
0.001-inch (0.025 mm), 0.002-inch (0.050 mm) and 0.010-
inch (0.254 mm) undersize for use with replacement and
remanufactured crankshafts.
Replacement and Inspection
Before removal of the connecting rod and cap, stamp
the side of the connecting rod and cap with correspond
ing cylinder number to assure matched reassembly.
(1) With oil pan and oil pump removed, remove
connecting rod cap and bearing.
(2) Inspect bearing inserts for evidence of wear or
damage.
(3) Wipe bearings and journal clean of oil.
(4) Measure journal for out-of-round or taper with
micrometer. If not within specification, replace or recon
dition crankshaft. If within specification and replace
ment bearing inserts are to be installed, measure
maximum diameter of journal to determine required
size of replacement bearing inserts.
(5) If within specification, measure replacement or
original bearing clearances with Plastigage, or
equivalent.
(6) If bearing is being fitted to out-of-round journal,
allow for maximum diameter of journal. If bearing is
fitted to minimum diameter and journal is out-of-round,
interference between bearing and journal will result and
rapid bearing failure will occur.
(a) Place strip of Plastigage on full width of
journal on area that is contacted by bearing (parallel to
crankshaft).