Subaru IMPREZA 2002 Service Manual page 183

CYLINDER BLOCK
MECHANICAL
Second
rina
2) Squarely place the piston ring and oil ring in cyl-
inder, and measure the piston ring gap with a thick-
ness gauge.
I
Unit: mm (in)
I
1
.O
(0.039)
0.35
-
0.50
( 0 . 0 1 38
-
0.01 97)
I I
Standard
1
Limit
I
Oil ring
rail
Piston
ring gap
1.5 (0.059)
0.20
-
0.70
(0.0079
-
0.0276)
I
1.0 (0.039)
I
0.20 - 0.35
Top ring
1
10.0079
-
0 . 0 1 38)
Standard
Limit
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.
0.040
-
0.080
(0.0016
-
0.15 (0.0059)
0.030
-
0.070
0.0028)
ring
between pis-
ton ring and
groove
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)
B2M11848
(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
Limit
0.070
-
0.330 mm (0.0028
-
0.0130 in)
0.4 mm (0.016 in)
EN0335
ME( SO HC)-85