B
8.
Refer to Figure
8-1
5.
Before installing the piston
in the cylinder, oil the piston, rings, piston pin, rod
bearings and cylinder wall. Stagger the piston
ring gaps
90"
apart around the piston. Use a pis-
ton ring compressor when installing piston. Turn
crankshaft to bottom of stroke. Align match mark
on connecting rod with flywheel side of
crankcase. On
STD
type engines, match the
mark
'DF'
on the piston with the mark
'MAG'
on
connecting rod. For reduction type engines,
match the mark
'BF'.
Tap
piston into cylinder until
rod contacts crank pin.
9.
Install connecting rod cap with oil scraper
on
governor shaft side. Use a new rod bolt lock
plate when installing connecting rod bolts.
Torque to specifications (see 'SPECIFICA-
TIONS').
Check for free movement
of
connecting rod by turn-
ing crankshaft slowly. If satisfactory, bend tabs on
lock plate against flat of connecting rod
bolts.
Piston
Rings
Figures
8-16
and
8-17
1.
To prevent piston rings from becoming distorted
or broken, use a ring expander tool to
remove rings.
CAUTION:
During reassembly, assemble bot-
A
tom ring first and work upward, installing top
ringJast. Refer to Figure
8-1
6.
Spread ring only
far enough to slip over piston and into correct
groove. Use care not to distort ring.
2.
Refer to Figure
8-1
7.
Install
oil
ring first.
If
install-
ing replacement rings, install second ring with
scraper edge down, otherwise
oil
pumping and
excessive oil consumption will result. Install top
ring last.
Stagger the piston ring gaps
90"
apart around
the piston.
I
PISTON
RING
GUIDE
CONNECTING
ROD
I
/
CRANKCASE
Figure
8-1
5.
1
Figure
8-1
6.
Figure
8-1
7.
8-7
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