Suzuki Engine 2002 GRAND VITARA SQ625, Service Manual

Page: 481 / 834

6A2-106 ENGINE MECHANICAL (H25 ENGINE)
Cylinder Block
Distortion of gasketed surface
• Using straightedge and thickness gauge, check gasketed
surface for distortion and, if flatness exceeds its limit, correct
it.
Flatness limit of cylinder block
0.06 mm (0.0024 in.)
Honing or reboring cylinders
1) When any cylinder needs reboring, all other cylinders must
also be rebored at the same time.
2) Select oversized piston according to amount of cylinder
wear.
Piston diameter
3) Using micrometer, measure piston diameter.
4) Calculate cylinder bore diameter to be rebored as follows.
D = A + B – C
D : Cylinder bore diameter to be rebored
A : Piston diameter as measured
B : Piston clearance = 0.02 – 0.04 mm (0.0008 – 0.0015 in.)
C : Allowance for honing = 0.02 mm (0.0008 in.)
5) Rebore and hone cylinder to calculated dimension.
6) Measure piston clearance after honing.
Size Piston diameter
STD
O/S 0.50
83.970 – 83.990 mm (3.3059 – 3.3066 in.)
84.470 – 84.490 mm (3.3256 – 3.3263 in.)
1. 50 mm (1.96 in.)
2. 95 mm (3.74 in.)
NOTE:
Before reboring, install all main bearing caps in place
and tighten to specification to avoid distortion of bearing
bores.