Chapter
2
Basic Engine
5. Piston
and
Piston Pins
5-1.3
Replacing
the piston
A
floating type piston pin is used in this
engine.
The piston pin
can
be
pressed into the piston pin hole
at
room temperature
(coat
with
oil
to
make
it
slide
in
easily).
M4LHA
Series
mm(in.)
All
Piston
pin insertion hole dia.
37.000-37.011
(1.4567-1.4578)
Piston
pin outside dia.
36.994-37.000
(1.4565-1.4567)
Standard
clearance
0.017
(0-0.0007)
5-3 Piston rings
There
are
2
compression rings and 1
oil
ring.
The
absence
of
an oil ring on the piston skirt prevents oil from
being kept
on the
thrust surface and
in
turn
provides good
lubrication.
5-3.1
Measuring
the
rings
Measure
the thickness and width
of
the rings, and the ring-to-
groove clearance after installation.
Replace
if
wear exceeds
the
limit.
5-2 Piston pin
Measure
the outer diameter and replace the pin
if it
is
exces-
sively
wom.
Width
Thickness
2-22
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