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231 V6 ENGINE V.I. CODE C
6A3-17
9. Install oil pan.
PISTONS, RINGS, AND
CONNECTING RODS
PISTON A N D ROD ASSEMBLIES
Replacement, Disassembly and Inspection
1. Remove cylinder heads.
2. Examine the cylinder bores above the ring travel. If
bores are worn so that a shoulder or ridge exists at the top
of the cylinder, remove the ridges with a ridge reamer to avoid
damaging rings or cracking ring lands in pistons during
removal. See Fig. 6A3-35.
RIDGE CAUSED
BY
CYLINDER WEAR
3. Use a silver pencil or quick drying paint to mark the
cylinder number on all pistons, connecting rods and caps.
Starting at the front end of the crankcase the cylinders in the
right bank are numbered 2-4-6. Those in the left bank are
numbered 1-3-5.
4. To remove piston and rod assemblies:
With No. 1 crankpin straight down, remove the cap with
bearing shell from No. 1 connecting rod, install the
"short"connecting rod guide Tool J 24567-1 in the
connecting rod hole above the crankpin. Install the "long"
connecting rod guide Tool J 24567-2 in remaining hole. Turn
guides down fully to hold the upper bearing shell in place
while removing the piston and rod assembly. See Fig. 6A3-36.
5. Use the long guide to push the piston and rod
assembly out of the cylinder, then remove guides and reinstall
cap with bearing shell on rod.
6. Remove all other piston and rod assemblies in the
same manner.
7. Remove compression rings and remove oil ring.
8. To remove piston pin:
a. Use piston pin remover and installer J 24086.
b. Install pilot of J 24086 on piston pin.
c. Install piston and connecting rod assembly on support
and place in a press. See Fig. 6A3-37 press pin from rod and
Fig.
6A3-36
Connecting Rod Bolt Guides Installed
piston.
Fig.
6A3-35
Ridge Formed
by
Rings at Top of Travel
Fig.
6A3-37
Removing Piston Pin
9. Inspect cylinder walls for scoring, roughness, or ridges
which indicate excessive wear. Check cylinder bores for taper
and out-of-round with an accurate cylinder gage at top,
middle and bottom of bore, both parallel and at right angles
to the centerline of the engine. The diameter of the cylinder
bores at any point may be measured with an inside
micrometer or setting the cylinder gage dial at "0"and
measuring across the gage contact points with outside
micrometer while the gage is at same "Wsetting.
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