Subaru Impreza 2004 - Manual (Page 4)

ME(H4DOTC)-3
MECHANICAL
General Description
Valve seat
Refacing angle 90 °
Contacting width
Intake
STD 1.0 mm (0.039 in)
Limit 1.7 mm (0.067 in)
Exhaust
STD 1.5 mm (0.059 in)
Limit 2.2 mm (0.087 in)
Valve guide
Inner diameter 6.000 — 6.012 mm (0.2362 — 0.2367 in)
Protrusion above head 15.8 — 16.2 mm (0.622 — 0.638 in)
Valve
Head edge thickness
Intake
STD 1.2 mm (0.047 in)
Limit 0.8 mm (0.031 in)
Exhaust
STD 1.5 mm (0.059 in)
Limit 0.8 mm (0.031 in)
Stem diameter
Intake 5.955 — 5.970 mm (0.2344 — 0.2350 in)
Exhaust 5.945 — 5.960 mm (0.2341 — 0.2346 in)
Stem oil clearance
STD
Intake 0.030 — 0.057 mm (0.0012 — 0.0022 in)
Exhaust 0.040 — 0.067 mm (0.0016 — 0.0026 in)
Limit — 0.15 mm (0.0059 in)
Overall length
Intake 104.4 mm (4.110 in)
Exhaust 104.7 mm (4.122 in)
Valve
spring
Free length 47.32 mm (1.8630 in)
Squareness 2.5 °, 2.1 mm (0.083 in)
Tension/spring height
Set
205 — 235 N (20.9 — 24.0 kgf, 46.1 — 52.8 lb)/
36.0 mm (1.417 in)
Lift
426 — 490 N (43.4 — 50.0 kgf, 95.8 — 110 lb)/
26.5 mm (1.043 in)
Cylinder
block
Surface warpage limit (mating with cylinder head) 0.05 mm (0.0020 in)
Surface grinding limit 0.1 mm (0.004 in)
Cylinder bore STD
A 92.005 — 92.015 mm (3.6222 — 3.6226 in)
B 91.995 — 92.005 mm (3.6218 — 3.6222 in)
Taper
STD 0.015 mm (0.0006 in)
Limit 0.050 mm (0.0020 in)
Out-of-roundness
STD 0.010 mm (0.0004 in)
Limit 0.050 mm (0.0020 in)
Piston clearance
STD 0.010 — 0.030 mm (0.0004 — 0.0012 in)
Limit 0.050 mm (0.0020 in)
Enlarging (boring) limit 0.5 mm (0.020 in)
Piston Outer diameter
STD
A 91.985 — 91.995 mm (3.6214 — 3.6218 in)
B 91.975 — 91.985 mm (3.6211 — 3.6214 in)
0.25 mm (0.0098 in)
OS
92.225 — 92.235 mm (3.6309 — 3.6313 in)
0.50 mm (0.0197 in)
OS
92.475 — 92.485 mm (3.6407 — 3.6411 in)
Piston pin
Standard clearance between piston
pin and hole in piston STD 0.004 — 0.008 mm (0.0002 — 0.0003 in)
Limit 0.020 mm (0.0008 in)
Degree of fit
Piston pin must be fitted into position with thumb at 20 °C
(68 °F).