Subaru IMPREZA GD 2007 Series Manual page 2463

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MECHANICAL
C: INSPECTION
1) Measure the bend, and repair or replace if nec-
essary.
Service limit:
0.020 mm (0.00079 in)
2) Check the journal for damage and wear. Re-
place if faulty.
3) Check the cutout portion used for camshaft sen-
sor for damage. Replace if faulty.
4) Measure the outside diameter of camshaft jour-
nal. If the journal diameter is not within the standard
value, check the oil clearance.
Front
Standard 37.946 — 37.963
mm (in) (1.4939 — 1.4946)
5) Measurement of the camshaft journal oil clear-
ance
(1) Clean the bearing caps and camshaft jour-
nals.
(2) Place the camshafts on cylinder head.
(Without installing the valve lifter)
(3) Place a plastigauge across each camshaft
journals.
(4) Gradually tighten the cap in at least two
stages in alphabetical order shown in the figure,
and then tighten to specified torque. Do not turn
the camshaft.
Tightening torque:
T1: 9.75 N·m (1.0 kgf-m, 7.2 ft-lb)
T2: 20 N·m (2.0 kgf-m, 14.8 ft-lb)
(A)
(E)
T1
(F)
(B)
(5) Remove the bearing caps.
Camshaft
ME-00118
Camshaft journal
Center, rear
29.946 — 29.963
(1.1790 — 1.1796)
T2
(C)
(D)
ME-00774
ME(H4DOTC)-62
(6) Measure the widest point of the plastigauge
on each journal. If the oil clearance exceeds the
limit, replace the camshaft. If necessary, re-
place the camshaft caps and cylinder head as a
set.
Standard:
0.037 — 0.072 mm (0.0015 — 0.0028 in)
Service limit:
0.10 mm (0.0039 in)
(7) Completely remove the plastigauge.
6) Check the cam face condition; remove the minor
faults by grinding with oil stone. Measure the cam
height H. Replace if it exceeds the limit or there is
uneven wear.
Cam height H:
Standard
Intake
46.55 — 46.65 mm (1.833 — 1.837 in)
Exhaust
46.75 — 46.85 mm (1.841 — 1.844 in)
Limit
Intake
46.45 mm (1.829 in)
Exhaust
46.65 mm (1.837 in)
Cam base circle diameter A:
37.0 mm (1.457 in)
H
A
ME-00119
ME-00120