Subaru Impreza 2002 Service Manual page 227

MECHANICAL
2) Squarely place the piston ring and oil ring in cyl-
inder, and measure the piston ring gap with a thick-
ness gauge.
Top ring
(0.0079 — 0.0098)
Piston Second
ring gap ring (0.0138 — 0.0197)
Oil ring
rail (0.0079 — 0.0197)
3) Measure the clearance between piston ring and
piston ring groove with a thickness gauge.
CAUTION:
Before measuring the clearance, clean the pis-
ton ring groove and piston ring.
Clearance
Top ring
between pis-
ton ring and
piston ring
Second
groove
ring
CYLINDER BLOCK
Unit: mm (in)
Standard Limit
0.20 — 0.25
1.0 (0.039)
0.35 — 0.50
1.0 (0.039)
0.20 — 0.50
1.5 (0.059)
G2M0174
Unit: mm (in)
Standard Limit
0.040 — 0.080
(0.0016 — 0.15 (0.0059)
0.0031)
0.030 — 0.070
(0.0012 — 0.15 (0.0059)
0.0028)
B2M1402A
5. CONNECTING ROD
1) Replace the connecting rod, if the large or small
end thrust surface is damaged.
2) Check for bend or twist using a connecting rod
aligner. Replace the connecting rod if the bend or
twist exceeds the limit.
Limit of bend or twist per 100 mm (3.94 in) in
length:
0.10 mm (0.0039 in)
(A) Thickness gauge
(B) Connecting rod
3) Install the connecting rod fitted with bearing to
crankshaft and measure the side clearance (thrust
clearance). Replace the connecting rod if the side
clearance exceeds the specified limit.
Connecting rod side clearance:
Standard
0.070 — 0.330 mm (0.0028 — 0.0130 in)
Limit
0.4 mm (0.016 in)
ME(STi)-88
B2M1184B
EN0335