TM 5-6115-400-35
piston groove; then install the ring
with either side up over the spring
with the gap of the ring 1800 from
the joint of the spring.
(b) Install the three compression rings.
(7) Assembly of connecting rod to piston.
(a) Before assembling connecting rod
to the piston, inspect the connecting
rod (refer to para c following).
(b) Install one of the piston pin retainers
in one end of the piston pin hole in
the piston.
(c) Insert upper end of connecting rod
into piston.
Caution.
Pistons have a recess cut into the
top of the piston for each valve, the
piston MUST be installed with the
recesses under the intake valves for
each cylinder. See figure 93. Piston
Figure 93. Intake valve recess in top of piston.
numbers 1, 2, 4, and 5 must be
(a) Stagger piston ring gaps evenly
installed with the recesses to the rear
around piston and apply clean
of the engine. Piston numbers 3 and
engine oil to pistons and rings.
6 must be installed with
the
With a piston inserter install the
recesses to the front of the engine.
piston and connecting rod in the
(d) Lubricate piston pin with clean oil
cylinder sleeve by tapping on top of
and, with a piston pin remover and
piston with wooden hammer handle.
installer tool (fig. 92) tap piston pin
If any difficulty is encountered,
into piston and connecting rod.
however slight, the piston inserter
(e) Install the other piston pin retainer
must be removed and ring set
at the opposite end of the piston
inspected for correct installation in
pin.
piston grooves. Align lower end of
(8) Piston, connecting rod, and connecting
connecting rod with crankshaft
rod bearing installation.
Install each
before inserting piston into cylinder.
piston, with rings and connecting rods, as
(b) Lubricate and install a bearing shell
an assembly. The lower end of each
in position in connecting rod, with
connecting rod, as well as the connecting
tang of bearing shell in the
rod bearing caps, are numbered 1, 2, 3,
corresponding slot in connecting
etc. for identification and must be installed
rod, and position rod on crankshaft
in the corresponding numbered cylinder
journal.
with the numbered side of rod toward the
Caution.
camshaft side of engine.
Make certain the backs of the bearing
Note.
shells are free from dirt and grit
Refer to the caution under step 3 in
particles.
preceding paragraph (7).
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