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16
Ill. ENGINE
7. Measure the valve-to-valve guide clearance.
Standard value:
Intake: O.OJ5--0.035mm
(0.0006--0.0014-in.)
Exhaust:0.033-
0.055mm
(0.0013-0.0022-in.)
Service
limit: Intake: 0.08mm (0.0032-in.)
Exhaust:O. Imm
(0.0039-in.)
8. Check
the
free length
of each
valve
spring.
Standard value:
Inner
: 33.25mm (l.3091
-in.)
Outer: 35.05mm (J.3799-in.)
Service limit:
Inner
:
32.0mm (1.2598-in.)
Outer
: 34.5mm (1.3583-in.)
Cylinder and piston
I.
Measure the inside
diameter
of each
cylinder.
Measure
the
bore al
the
top, middle and bottom with an
accurate
cylinder
gauge placed at
right
angle
(Y)
and
parallel (X)
lo the
centerline of
the crankshafL
If
the
wear is so great that the service
limits
are
ex-
ceeded, the
cylinders should be
rebored
and oversize
pistons and piston rings
installed.
The following four
oversize
pistons and piston rings are
available
as service
parts:
Oversize
piston
Sizes
to which cylinder is
to
and
piston
ring
mm
be
re
bored mm(in.)
0. 25
55. 75
-
55.
76 (2.
I
949
2.
1953)
0.50
$6.00-
56.01
(2.2047-
2.2051)
0.75
56.25-
56.26
(2.2146
2.2150)
- -
'l
" '
.00
'-=----~-'- 56. 50-
56.51
(2.2244-
22248)
Standard value:
S5 .S0-5S.S I mm(
2.1850-
2.1854-in.)
Service limit:
SS.6 mm(2.1890-in.)
2.
Measure the outside
diameter
of the
piston at
its
skirt.
Standard value:
55.47-
SS.49mm (2.1839-2.1846-in.)
Service limit: 55.42mm (2.1819-in.)
3.
Measure the inside
diameter of
Lhc
piston pin
hole
in the
pistoit
Standard value:
I
S.002-
l 5.008mm
(O.S906-
0.5909-in.)
Servire limit:
15.05mm
(0.5925-in.)
4. Measure the
outside
diameter
of
the
piston pin.
Standard value: 14.994-15.000mm (0.5903--0.5906-in.)
Servire limit: 14.9mm (O.S866-in.)
S. Check
the
clearance
between
the
piston ring an<l
ring
groove.
Standard value: Top : 0.04--0.07Smm
(0.0016-0.0030-in.)
2nd.: 0.02S
-
0.06mm
(0.00
I
0-0.0024-ill.)
Oil
:
O.oJS-0.04Smm
(0.0006 0.0018-in.)
Sen·icc limit:
0.15mm (0.00S9-ill.)
6.
('heck
the
piston
ring
en<l gap
using
a feeler gluge.
Standard value: 0.1 S--0.35mm
(0.0059-
0.0138-in.)
Servjce limit:
0.75mm (0.029S-in.)
Fig.
3-11 Measuring valve stem-to-valve guide clearance
Fig.
3-12 Measuring
cylinder
bore
Fig.
3-13 Measuring
piston ring end glp
(1)
J'ig. 3-14
(I)
Piston
ring top marking
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