Chapter 2 Basic Engine
_3._P_is_to_n_s_a_n_d_P_is_t_on_P_in_s
________________________
3,4JH3(B)(C)E
3. Piston and Piston Pins
Pistons are made of a special light alloy with superior ther-
mal expansion characteristics, and the top
of the piston
forms
a swirl
type
toroidal combustion chamber.
The
opposite face of the piston combustion surface
is
oil-jet
cooled.
Piston for engines with superchargers
have a valve ress
for
the intake and exhaust valves.
The clearance between the piston and cylinder liner
is
kept
at
the pronper valve by the piston cylinder liner prop-
erty
fit
effected during assembly at the Yanmmar factory.
Printed
in J.apan
HINSHI-H8009
1 st compression ring
2nd
compression
ring
_,.----
Applicable
engine
model
!.D.
mark
Piston pin
Circ!ip
ID
Mark for Piston
L
ML
Ms
s
2-11
IMPORTANT:
Piston shape differs among engine models. If
an
incorrect
piston is instafled, combustion performance will drop. Be
sre to check the applicable engine model identification
mark (f.D.Mark)
on
the piston to insure use
of
the correct
part.
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