M-4
WG972-E2, DF972-E2, WSM
GASOLINE / LPG ENGINE
[5] PISTON AND PISTON RING
■ Piston
Expansion Control Piston:
The thermal expansion is suppressed to the minimum
by the adoption of the strut (5). The piston head has the
combustion chamber (1) with the concave of bathtub
shaped type.
■ Piston Ring
Top Ring:
Barrel-faced type has an ideal shape in terms of
lubrication theory in order to prevent abnormal wear due
to edge loading at the time of initial running-in, and it is
very effective in prevention of blow-by.
Second Ring:
Barrel-faced type has an ideal shape in terms of
lubrication theory in order to prevent abnormal wear due
to edge loading at the time of initial running-in, and it is
very effective in prevention of blow-by.
Oil Ring:
Oil ring consists of three steel components, that is
upper and lower rails and one spacer being held between
two rails. This function is particularly effective in
preventing oil-up because of high boost at the time of
engine coasting.
W1015665
■ Piston Skirt
Piston's skirt is coated with molybdenum isulfide ★,
which reduces the piston slap noise and thus the entire
operating noise.
★ Molybdenum disulfide (MoS
2)
The molybdenum disulfide serves as a solid lubricant,
like a Graphite or Teflon. This material helps resist metal
wears even with little lube oil.
W1017255
(1) Combustion Chamber
(2) Top Ring
(3) Second Ring
(4) Oil Ring
(5) Strut
(1) Molybdenum Disulfide
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