Subaru LEGACY 2006 Manual page 853

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4) Check the snap ring installation groove (A) on
the piston for burr. If necessary, remove burr from
the groove so that the piston pin can lightly move.
(A)
5) Check the piston pin snap ring for distortion,
cracks and wear.
4. PISTON RING
1) If the piston ring is broken, damaged or worn, or
if its tension is insufficient, or when the piston is re-
placed, replace the piston ring with a new part of
the same size as the piston.
CAUTION:
• Marks are displayed on the end of top and
second rings. When installing the rings to pis-
ton, face these marks upward.
• Oil ring consists of the upper rail, expander
and lower rail. Be careful about the direction of
rail when installing the oil ring to piston.
(A) Upper rail
(B) Expander
(C) Lower rail
Cylinder Block
2) Clean the piston ring groove and piston ring.
3) Squarely place the piston ring and oil ring in cyl-
inder, and measure the piston ring gap with a thick-
ness gauge.
Piston ring
gap
ME-00175
4) Measure the clearance between piston ring and
piston ring groove with a thickness gauge.
Clearance
between pis-
ton ring and
piston ring
groove
(A)
(B)
(C)
(A)
(B)
(C)
ME-02472
ME(H4SO)-79
MECHANICAL
Standard
0.20 — 0.35
Top ring
(0.0079 — 0.0138)
Second 0.37 — 0.52
ring (0.0144 — 0.0203)
0.20 — 0.50
Oil ring rail
(0.0079 — 0.0197)
ME-00177
Standard
0.040 — 0.080
Top ring
(0.0016 — 0.0031)
Second 0.030 — 0.070
ring (0.0012 — 0.0028)
ME-00178
mm (in)
mm (in)