Subaru 1600 Service Manual page 91

--
Top ring
Clearance between
piston ring and
piston ring groove
Second ring
Oil ring
14. 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 con-
necting rod if the bend or twist
exceeds the limit.
I
Limit of bend or
twist per 100 mm
I (3.94 in) in length
I Thickness gauge
2 Connecting rod
1 Connecting rod
2 Thickness gauge
0.10 mm
(0.0039 in)
A5-077
A5-07S
Fig. 3·106 Measuring piston ring
groove clearance
ENGINE
Standard
Limit
l
0.04 0.08 mm 0.15 mm
(0.0016
0.0031 in) (0.0059 in)
i
0.03 - 0.07 mm 0.15 mm
(0.0012
0.0028 in) (0.0059 in)
0 0
_M._
;
3) Install connecting rod fitted with
bearing to crankshaft and measure the
side clearance (thrust clearance). Re-
place connecting rod if the side
clearance exceeds the specified limit.
Fig. 3-107 Measuring side clearance
Connecting rod side clearance
Standard
0.070 - 0.330 mm
(0.0028 - 0.01 30 in)
Limit 0.4 mm (0.016 in)
4) Inspect connecting rod bearing
for scar, peeling, seizure, melting,
wear, etc.
5) Measure the oil clearance on in-
dividual connecting rod bearings by
means of plastigauge according to the
following procedure.
i
I
i
A5·0S0
Fig. 3-108 Measuring connecting rod
oil clearance
a. Wipe off oil, dust, etc. on the sur-
faces
to
be measured.
b. Cut the plastigauge to the width of
the bearing, place it on the crank-
pin parallel with the crankshaft
axis, and install connecting rod.
Tighten connecting rod nuts to
41 N'm (4.2 kg-m, 30 ft-lb).
NOTE:
During this measurement, do not allow
relative movement between the crank·
pin and connecting rod.
c. Remove connecting rod and mea·
sure the width of the plastigauge
with the scale printed on the
plastigauge case.
If any oil clearance is not within
specification, replace the defective
bearing with a new one of standard
size or undersize as necessary, and
replace or recondition the crank-
shaft as necessary. (See the table
below.)
6) Inspect bushing at connecting rod
small end, and replace if worn or
damaged. Also measure the piston pin
clearance at the connecting rod small
end.
Standard clear-
ance between
i
piston pin and
bushing in con-
necting rod
o
0.022mm
(0 - 0.0009 in)
Connecting rod oil clearance
Standard
0.020 - 0.070 mm (0.0008 - 0.0028 in)
Limit
0.10 mm (0.0039 in)
3-54