Suzuki Engine 2002 GRAND VITARA SQ420 Service Manual page 463

6A2-88 ENGINE MECHANICAL (H25 ENGINE)
ASSEMBLY
NOTE:
Two sizes of piston are available as standard size spare
part so as to ensure proper piston-to-cylinder clearance.
When installing a standard size piston, make sure to
match piston with cylinder as follows.
a) Each piston has stamped number (1 or 2) on its piston
head. It represents outer diameter of piston.
b) There are also stamped numbers of 1 and 2 on the cylinder
block as shown.
c) Stamped number on piston and cylinder block must corre-
spond. That is, install number "2" stamped piston to cylinder
which is stamped also number "2" and a number "1" piston
to cylinder with number "1".
Piston and cylinder block specification
Piston
Num-
ber at Outer diame-
the top ter
(mark)
83.98 – 83.99
1 mm (3.3063
– 3.3066 in.)
83.97 – 83.98
2 mm (3.3059
– 3.3062 in.)
Also, a letter A or B is stamped on piston head but ordinarily it is
not necessary to distinguish each piston by this letter.
[A]: Crankshaft pulley side
[1]: No.2 cylinder
[2]: No.1 cylinder
[3]: No.4 cylinder
1) Install piston pin to piston (1) and connecting rod (3) :
After applying engine oil to piston pin and piston pin holes in
piston and connecting rod, fit connecting rod to piston as
shown in figure and insert piston pin to piston and connect-
ing rod, and install piston pin circlips.
NOTE:
"86F" mark on connecting rod must face toward crank-
shaft pulley side.
2. Arrow mark
Cylinder
Num-
ber on
Bore diame-
cylin-
ter
der
block
84.01 – 84.02
1 mm (3.3075
– 3.3078 in.)
84.00 – 84.01
2 mm (3.3071
– 3.3074 in.)
[4]: No.3 cylinder
[5]: No.6 cylinder
[6]: No.5 cylinder
Piston-to-
cylinder
clearance
0.02 – 0.04
mm (0.0008
– 0.0015 in.)
0.02 – 0.04
mm (0.0008
– 0.0015 in.)