Subaru Impreza 2003, Service Manual

Page: 275 / 3610

ME(H4SO)-63
MECHANICAL
CAMSHAFT
C: INSPECTION
1. CAMSHAFT
1) Measure the bend, and repair or replace if nec-
essary.
Limit:
0.025 mm (0.0010 in)
2) Check the journal for damage and wear. Re-
place if faulty.
3) Measure the outside diameter of camshaft jour-
nal and inside diameter of cylinder head journal,
and determine the difference between two (= oil
clearance). If the oil clearance exceeds specifica-
tions, replace the camshaft or cylinder head as
necessary.
4) Check the cam face condition; remove the minor
faults by grinding with oil stone. Measure the cam
height H; replace if the limit has been exceeded.
Cam height: H
Cam base circle diameter A:
IN: 34.00 mm (1.3386 in)
EX: 34.00 mm (1.3386 in)
2. CAMSHAFT SUPPORT
Measure the thrust clearance of camshaft with dial
gauge. If the clearance exceeds the limit, replace
the camshaft support.
Standard:
0.030 — 0.090 mm (0.0012 — 0.0035 in)
Limit:
0.10 mm (0.0039 in)
Unit: mm (in)
Clear-
ance at
journal Standard 0.055 — 0.090 (0.0022 — 0.0035)
Limit 0.10 (0.0039)
Camshaft journal O.D.
31.928 — 31.945 (1.2570 —
1.2577)
Journal hole I.D.
32.000 — 32.018 (1.2598 —
1.2605)
Model Item Unit: mm (in)
1.6 L
Intake
STD
39.378 — 39.478
(1.5503 — 1.5542)
Limit 39.278 (1.5464)
Exhaust
STD
39.565 — 39.665
(1.5577 — 1.5616)
Limit 39.465 (1.5537)
2.0 L
Intake
STD
38.732 — 38.832
(1.5249 — 1.5288)
Limit 38.632 (1.5209)
Exhaust
STD
39.257 — 39.357
(1.5455 — 1.5495)
Limit 39.157 (1.5416)
ME-00275
2.5 L
Intake
STD
39.485 — 39.585
(1.5545 — 1.5585)
Limit 39.385 (1.5506)
Exhaust
STD
39.257 — 39.357
(1.5455 — 1.5495)
Limit 39.157 (1.5416)
Model Item Unit: mm (in)
ME-00276
H
A
ME-00277