PISTON PINS
The piston pin is full floating and is held in place
by lock rings. Pistons and rods are weight matched
for balance. Do Not switch pistons with other
rods. Piston and Rods are serviced as an assembly
for balance.
PISTON RING—FITTING
(1) Wipe cylinder bore clean. Insert ring and push
down with piston to ensure it is square in bore. The
ring gap measurement must be made with the ring
positioning at least 12 mm (0.50 inch.) from bottom
of cylinder bore. Check gap with feeler gauge (Fig.
20). Refer to Engine Specifications.
(2) Check piston ring to groove clearance: (Fig. 21).
Refer to Engine Specifications.
PISTON RINGS—INSTALLATION
(1) The No. 1 and No. 2 piston rings have a differ-
ent cross section. Insure that No. 2 ring is installed
with the manufacturers I.D. mark (dot) facing up,
towards top of the piston (Fig. 22).
CAUTION: Install piston rings in the following
order:
(2) Oil ring expander.
(3) Upper oil ring side rail.
(4) Lower oil ring side rail.
(5) No. 2 Intermediate piston ring.
(6) No. 1 Upper piston ring.
(7) Install the side rail by placing one end between
the piston ring groove and the expander. Hold end
firmly and press down the portion to be installed
until side rail is in position. Do not use a piston
ring expander during this step (Fig. 23).
Fig. 19 Piston Measurements
Fig. 20 Check Gap on Piston Rings
1 – FEELER GAUGE
Fig. 21 Measuring Piston Ring Side Clearance
1 – FEELER GAUGE
Fig. 22 Piston Ring—Installation
1 – SPACER EXPANDER
2 – SIDE RAIL
9 - 24 2.7L ENGINE LH
SERVICE PROCEDURES (Continued)
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