Table of Contents
Advertisement
POWR
Checking the cylinder bore
1. Measure the cylinder bore (D
measuring points a, b, and c, and in
direction d (D
, D
1
to the crankshaft, and direction e (D
D
, D
), which is at a right angle to the
4
6
crankshaft.
c
d
e
a: 10.0 mm (0.39 in) from the cylinder head top
surface
b: 5.0 mm (0.20 in) above the exhaust port
upper edge
c: 5.0 mm (0.20 in) below the scavenging port
lower edge
Cylinder bore (D
90.000–90.020 mm
(3.5433–3.5441 in)
Cylinder gauge 1:
90890-06759
Checking the piston clearance
1. Calculate the piston clearance using the
piston outside diameter and the cylinder
bore specifications. Replace the piston
and piston rings as a set or the cylinder
block or all parts, or rebore the cylinder if
out of specification.
NOTE:
Be sure to rebore the cylinder for matching
the replacement oversize pistons, when
using the specified oversize pistons.
Piston clearance:
0.080–0.085 mm
(0.0032–0.0033 in)
5-37
Power unit
–D
) at
1
6
, D
), which is parallel
3
5
1
a
b
6F650370
–D
):
1
6
Checking the piston ring
1. Check the piston ring dimensions of B
and T. Replace the piston and piston
rings as a set if out of specification.
,
2
Piston ring dimension
Top ring and 2nd piston ring:
2. Level the piston ring 1 in a cylinder with
a piston crown.
3. Check the piston ring end gap a at the
specified measuring point b. Replace
the piston ring set if out of specification.
Piston ring end gap a:
E115A:
115B, 140B:
Measuring point b: 10 mm (0.39 in)
B
T
B: 1.970–1.990 mm
(0.0776–0.0783 in)
T: 2.700–2.900 mm
(0.1063–0.1142 in)
a
0.30–0.40 mm (0.0118–0.0157 in)
Top:
0.30–0.50 mm (0.0118–0.0197 in)
2nd:
0.30–0.40 mm (0.0118–0.0157 in)
69D50410
b
1
1
6F650430
61U5H11
Advertisement
Chapters
Table of Contents
