Suzuki GA413 Service Manual page 361

c) Stamped number on piston and that on cylinder block should
1) Install piston pin to piston and connecting rod:
1. Piston
2. Match mark (O or 5 )
3. Connecting rod
4. Oil hole
The oil hole should
come on intake side
2) Install piston rings to piston:
1. 1st ring
2. 2nd ring
3. Oil ring
3) After installing three rings (1st, 2nd and oil rings), distribute their
1. Match mark (O or )
2. 1st ring end gap
3. 2nd ring end gap and
oil ring spacer gap
4. Oil ring upper rail gap
5. Oil ring lower rail gap
6. Intake side
7. Exhaust side
correspond. That is, install number 2 stamped piston to cylinder
which is identified with number 2 and a number 1 piston to cylin-
der with number 1.
Piston
Number
at the top Outer diameter
(mark)
73.98 – 73.99 mm
1
(2.9126 – 2.9130 in.)
73.97 – 73.98 mm
2
(2.9122 – 2.9126 in.)
Also, a letter A, B or C might be stamped on piston head but ordi-
narily it is not necessary to discriminate each piston by this let-
ter.
After applying engine oil to piston pin and piston pin holes in pis-
ton and connecting rod, fit connecting rod to piston as shown in
figure and insert piston pin to piston and connecting rod, and
install piston pin circlips.
NOTE:
Circlip should be installed with its cut part facing either up
or down as shown in figure.
D As indicated in figure at the left, 1st and 2nd rings have "RN",
"T" or "R" mark respectively. When installing these piston
rings to piston, direct marked side of each ring toward top of
piston.
D 1st ring differs from 2nd ring in thickness, shape and color of
surface contacting cylinder wall.
Distinguish 1st ring from 2nd ring by referring to figure.
D When installing oil ring, install spacer first and then two rails.
end gaps as shown in figure.
ENGINE MECHANICAL 6A-55
Cylinder
Number
Bore diameter
(mark)
74.01 – 74.02 mm
1
(2.9138 – 2.9141 in.)
74.00 – 74.01 mm
2
(2.9134 – 2.9138 in.)
Piston-to-cylinder
clearance
0.02 – 0.04 mm
(0.0008 – 0.0015
in.)
0.02 – 0.04 mm
(0.0008 – 0.0015
in.)