Piston And Piston Pin Fit - Ford LRG-423 Service Manual

01-23
Engine Service
01-23
SERVICE PROCEDURES (Continued)
5. Make sure that the ring is " square" in the bore.
6.
Check the piston ring end gap and compare to
specification found in Section 02. Using a feeler
gauge, check the piston ring end gap.
I I
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' ISTON P
RING
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6149
Al 4712-B
7. If the ring gap is too small, the ring will have to be
filed until the end gap is within specifications. The
use of a ring filing block helps ensure that the ring
ends are filed square.
FILING BLOCK
A238709A
8.
CAUTION: Install the piston rings after the piston
has been installed on the connecting rod. Since
the piston may be supported by the crown
during this operation, the rings could be
damaged.
CAUTION: Use a piston ring expander to
install the piston rings. Attempting to wind
them on by hand may put a deep scratch in
the piston or break the ring.
Using a piston ring expander, install the piston
rings starting with the oil control rings. Make sure
rings are installed right side up. Refer to
instructions with the ring set.
9. Rotate the rings so the end gaps are NOT lined
up but are spaced properly as shown.
FRONT
A281 1 -C
10. Using a feeler gauge, recheck piston ring side
clearance.
FEELER
A23879-A
Il. Continue with engine assembly as outlined in
Section 02.
Piston and Piston Pin Fit
NOTE: New pistons come with fitted piston pins (6135)
and should not require refitting unless the connecting
rod bore is oversize.
The Ford 2.3L gasoline engine uses piston pins which
press into the connecting rods. The piston pivots on
the pin. There is no connecting rod bushing but rather
an interference fit between the piston pin and the
connecting rod.
Refer to Section 02 for specifications and assembly
instructions.