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231 V6 ENGINE V.I. CODE C
6A3-21
Fig. 6A3-46 Installing Piston Pin
11. Before installation of a
is ton
and rod assemblv in
its bore, position the crankpin s&aight down.
12. Remove cap, and with bearing upper shell seated in
connecting rod, install the long Guide J 24567-1 in bolt hole
which is on same side of rod as the notch for the tang of the
bearing insert. Install short Guide J 24567-2 in the other bolt
hole.
These guides hold the upper bearing shell in place and
protect the crankpin journal from damage during installation
of connecting rod and piston assembly.
13. Make sure the gap in the oil ring rails is "up" position
toward center of engine and the gaps of the compression rings
are positioned as shown in Fig. 6A3-47.
14. Lubricate the piston and rings and install in bore by
compressing the rings either with a "wrap around"
compressor or a ring type such as shown in Fig. 6A3-48.
15.
Select
new
connecting
rod
bearing,
if
necessary.Otherwise install cap with bearing lower shell on
rod and tighten bolt nuts to specifications.
16. Install all other piston and rod assemblies in the same
manner:
When piston and rod assemblies are properly 'installed,
the notches on "al1"the pistons will point towards the front
of the engine. The boss on the connecting rods in the "right
bankl'will point towards the front of the engine and the
chamfers on the rod caps will point towards the rear of the
engine. The boss on the connecting rods in the "left bankWwill
point towards the rear of the engine and the chamfers on the
rod caps will point towards the front of the engine. See Figs
6A3-44 and 6A3-45.
17. Check end clearance between connecting rods on
each crankpin using feeler gages. Clearance should be
between .006" and .020M.
18. Install cylinder head. Install oil screen and engine
oil pan.
- - -
-
OIL RING GAP go0 FROM COMPRESSION
RlNG GAPS A N D O N CAMSHAFT SIDE OF
PISTON
7
NOTCH TOWARD F R O N T
OF ENGINE ( L E F T BANK
PISTON SHOWN)
7
TOP COMPRESSION
R l N G GAP OPPOSITE
NOTCH O N PISTON
2ND COMPRESSION
RING GAP BELOW
NOTCH ON PISTON
[=(OM-/
PRESSION
COMPRESSION
CAMSHAFT
-
GAP
I
Fig. 6A3-47 Piston Ring Gap Positioning
After installation of new pistons and rings, care should
be used in starting the engine and running it for the first hour.
Avoid high speeds until the parts have had a reasonable
amount of "break inWtime. This practice will avoid
unnecessary "scufing"of new parts.
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