Chapter 2 Basic Engine
5. Piston and Piston Pins
mm (in.)
Standard
Wear
limit
First
piston
ring
Groove
width
2.095 -2.110
(0.0825 - 0.0831)
-
First
piston
ring
Ring
width
1.975- 1.990
(0.0778 - 0.0783)
First
piston
ring
Groove
and
ring clearance
0.105-0.135
(0.0041 -0.0053)
0.15
(0.0059)
Second
piston
ring
Groove
width
2.045 - 2.060
(0.0805-0.0811)
-
Second
piston
ring
Ring
width
1.975- 1.990
(0.0778 - 0.0783)
-
Second
piston
ring
Groove
and
ring clearance
0.055 - 0.085
(0.0022 - 0.0035)
0.15
(0.0059)
Oil
ring
Groove
width
3.020 - 3.035
(0.1189-0.1195)
-
Oil
ring
Ring
width
2.92 - 2.99
(0.1169-0.1177)
-
Oil
ring
Groove
and
ring clearance
0.030 - 0.065
(0.0012-0.0026)
0.15
(0.0059)
5-3.2
Measuring
piston
ring
gap
Press
the piston ring onto a cylinder and measure the
piston ring gap
with
a gauge.
Press
on the ring about 30 mm (1.1811 in.) from the
bottom of the cylinder.
Gap
about 30mm
(1.181
lin.)
,
4LHA Sen
mm (in.)
Standard
Wear
limit
First
piston ring gap
0.25 - 0.40
(0.0098 - 0.0157)
1.5
(0.0591)
Second
piston ring gap
0.25 - 0.40
(0.0098 - 0.0157)
1.5
(0.0591)
Oil
ring gap
0.3 - 0.5
(0.0118-0.0197)
1.5
(0.0591)
5-3.3 Replacing the piston rings
(1) Thoroughly clean the ring grooves when replacing
piston rings.
(2) The side
with
the manufacturer's mark (near piston ring
gap) should face up.
The
side
with
the maker's
mark faces up
(3) After
fitting
the piston ring, make sure it moves easily
and
smoothly.
(4) Stagger the piston rings at 120° intervals, making sure
none of them line up
with
the piston.
1st compression ring
2nd compression ring
Oil
ring
1st compression ring
2nd
compression
ring
Oil
ring
2-23
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