Installing The Rear Main Oil Seal-1984 V6 Engine; Pistons Rods-Installation And Rod Bearing Oil Clearance Check; Connecting Rods-Installation And Rod Bearing Oil Clearance Check; Connecting Rod Bearing Oil Clearance Check - Jeep cherokee 1989 Owner's Manual

CRANKSHAFT
\
FRONT
ENGINE
BLOCK
23.9 installing the rear main oil seal
A Tool
B Seal
2 4 Pistonslconnecting rods
rod bearing oil clearance check
Refer to illustrations 24.5, 24.9, 24. 1 1, 24.13 and 24.17
1 Before installing the pistonlconnecting rod assemblies, the cylinder
walls must be perfectly clean, the top edge of each cylinder must be
chamfered, and the crankshaft must be in place.
2 Remove the cap from the end of the number one connecting rod
(refer to the marks made during removal). Remove the original bear-
ing inserts and wipe the bearing surfaces of the connecting rod and
cap with a clean, lint-free cloth. They must be kept spotlessly clean.

Connecting rod bearing oil clearance check

3 Clean the back side of the new upper bearing insert, then lay it
in place in the connecting rod. Make sure the tab on the bearing fits
into the recess in the rod. Don't hammer the bearing insert into place
and be very careful not to nick or gouge the bearing face. Don't lubricate
the bearing at this time.
Clean the back side of the other bearing insert and install it in the
4
rod cap. Again, make sure the tab on the bearing fits into the recess
in the cap, and don't apply any lubricant. It's critically important that
the mating surfaces of the bearing and connecting rod are perfectly
clean and oil free when they're assembled.
5 Position the piston ring gaps at intervals around the piston (see
illustration).
6 Slip a section of plastic or rubber hose over each connecting rod
cap bolt.
7 Lubricate the piston and rings with clean engine oil and attach a
piston ring compressor to the piston. Leave the skirt protruding about
114-inch to guide the piston into the cylinder. The rings must be com-
pressed until they're flush with the piston.
8 Rotate the crankshaft until the number one connecting rod journal
is at BDC (bottom dead center) and apply a coat of engine oil to the
cylinder walls.
9 With the arrow or notch on top of the piston (see illustration) facing
the front of the engine, gently insert the pistonlconnecting rod assembly
into the number one cylinder bore and rest the bottom edge of the ring
compressor on the engine block.
10 Tap the top edge of the ring compressor to make sure it's contact-
ing the block around its entire circumference.
1 1 Gently tap on the top of the piston with the end of a wooden ham-
mer handle (see illustration) while guiding the end of the connecting
rod into place on the crankshaft journal. The piston rings may try t o
The Motor Manual Guy
Chapter 2 Part D General engine overhaul procedures
OIL PAN
GASKET SURFACE
A
REAR FACE
OF ENGINE BLOCK
-
1 9 8 4 V6 engine
D Alignment arrow
{points do wnl
installation and
Position the piston ring gaps as shown here before
24.5
installing the pistonlconnecting rod assemblies in the engine
A Oil ring rail gaps
ring gap
24.9 The arrow must point towards the front of the engine
24.1 1 The piston can be driven (gently) into the cylinder
bore with the end of a wooden hammer handle
pop out of the ring compressor just before entering the cylinder bore,
so keep some downward pressure on the ring compressor. Work
slowly, and if any resistance is felt as the piston enters the cylinder,
stop immediately. Find out what's hanging up and fix it before pro-
ceeding. Do not, for any reason, force the piston into the cylinder
you might break a ring andlor the piston.
12 Once the pistonlconnecting rod assembly is installed, the connect-
ing rod bearing oil clearance must be checked before the rod cap is
D Oil ring spacer gap (tang
in hole or slot with arc)
E Top compression ring gap
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