Subaru Legacy 2004 Service Manual page 1193

MECHANICAL
NOTE:
Difference between outer and inner perimeters of
top ring should be within 0.05 mm (0.0020 in).
3) Measure the clearance between piston ring and
piston ring groove with a thickness gauge.
NOTE:
Before measuring the clearance, clean the piston
ring groove and piston ring.
Clearance
Top ring
between
piston ring
and piston
Second ring
ring 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.
Cylinder Block
ME-00177
Standard
mm (in)
0.030 — 0.070
(0.0012 — 0.0028)
0.030 — 0.070
(0.0012 — 0.0028)
ME-00178
ME(H4DOTC)-82
Limit of bend or twist per 100 mm (3.94 in) in
length:
0.10 mm (0.0039 in)
( B )
(A) Thickness gauge
(B) Connecting rod
3) Install the connecting rod fitted with bearing to
crankshaft and measure the side clearance (thrust
clearance). If side clearance exceeds the limit or
has partial wear, replace the connecting rod.
Connecting rod side clearance:
Standard
0.070 — 0.330 mm (0.0028 — 0.0130 in)
4) Inspect the connecting rod bearing for scar,
peeling, seizure, melting, wear, etc.
5) Measure the oil clearance on individual connect-
ing rod bearings by means of plastigauge. If any oil
clearance is not within the specification, replace the
defective bearing with a new one of standard size
or undersize as necessary. (See the table below.)
( A )
( B )
( A )
ME-00179
ME-00180