Subaru XT 1988 Service Manual page 253

I
ENGINE
2-3
The oil ring is a combined ring consisting of two rails and a
spacer in between. When installing, be careful not to make
misassembly.
Top ring
Second ring
Oil ring
Fig. 236
~upperrail
~spacer
Lower rail
L2-1549
2) Squarely place piston ring in cylinder and measure the
piston ring gap with
a
th ickness gauge.
------=-----
Standard Limit
Top 0.20 - 0.35 mm 1.5mm
ring (0.0079 - 0.0138 in) (0.059 in)
Piston ring gap
Second 0.20 - 0.35 mm 1.5mm
ring (0.0079 - 0.0138 in) (0.059 in)
Oil ring 0.3 - 0.90 mm
2.0mm
rail
(0.012 - 0.0354 in) (0.079 in)
o
o
)
L2·478
Fig. 237
3) Measure the clearance between piston ring and piston ring
groove with a thickness gauge.
Before measuring the clearance, clean the piston ring groove
and piston ring.
97
~
Standard limit
Top
0.04 - 0.08 mm 0.15 mm
Clearance
ring (0.0016 - 0.0031 in) (0.0059 in)
between piston
Second 0.03 - 0.07 mm 0.15 mm
ring and piston
ring
(0.0012 - 0.0028 in) (0.0059 in)
ring groove
Oil ring 0 0
L2-1387
Fig. 238
CONNECTING ROD
1)
Replace connecting rod, if the large or small end thrust
surface is damaged.
2) Check for bend or twist using a connecting rod aligner.
Replace 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)