R e m o v e Piston and Connecting Rod
1. Drain the cooling system.
2 . Drain the oil and remove the oil pan.
3. Remove the oil pump and inlet and
outlet pipes, if necessary.
4. Remove the cylinder head.
5. Remove the carbon deposits from the
upper inner surface of the cylinder
liner.
6. Remove the bearing cap and the lower
bearing shell from the connecting rod.
Then push the piston and rod assembly
out through the top of the cylinder
Figure 11B-111. Piston and
block.
The piston cannot be removed
Connecting Rod Components
from the bottom of the cylinder block.
Inspect Piston Rings
7. Reassemble the bearing cap and lower
bearing shell to the connecting rod.
When an engine is hard to
start, runs
rough or lacks power, worn
or sticking
compression
rings
may
be
the
cause
D i s a s s e m b l e Piston and Connecting Rod
Replacing the rings will aid
in restoring
engine operation to normal.
Note the condition of the piston and
rings.
Then remove the rings and dis-
The compression rings may be inspected
a s s e m b l e the piston as follows:
through the ports in the cylinder liners
after the air box covers have been re-
1. Secure the connecting rod in a vise
moved.
I f the rings are free and are not
equipped with soft jaws and remove the
worn to the extent that the plating or
piston rings with tool J 8128 as shown in
grooves are gone, compression should be
F i g u r e 11B-113 on page 11B-72.
within operating specifications.
2. Punch a hole through the center of
one of the piston pin retainers with a
narrow chisel or punch and pry the re-
tainer from the piston, being careful not
to damage the piston or bushing.
Re-
move the opposite retainer in the same
manner.
3. Loosen the two bolts which secure the
connecting rod to the piston pin. Then
remove the rod and piston assembly from
the vise and place the assembly on the
bench.
R e m o v e the two bolts and spacer
and remove the connecting rod.
4. Withdraw the piston pin.
5. Separate the piston skirt from the pis-
ton crown.
6. Remove the metal seal ring from the
piston crown.
7. Remove the piston pin bushing.
F i g u r e 11B-112. Piston
Identification using Gauge J 25397
E n g i n e (Less Major Assemblies)
