Subaru 2009 IMPREZA, Service Manual

Page: 1061 / 3619

ME(H4DOTC)-3
General Description
MECHANICAL
NOTE:
OS: Oversize
US: Undersize
Belt tension
adjuster
Protrusion of adjuster rod mm (in) 5.2 — 6.2 (0.205 — 0.244)
Camshaft
Bending limit mm (in) 0.020 (0.00079)
Cam lobe height mm (in)
Intake Standard 46.55 — 46.65 (1.833 — 1.837)
Exhaust Standard 46.75 — 46.85 (1.841 — 1.844)
Cam base circle diameter mm (in) Standard 37.0 (1.457)
Journal O.D. mm (in)
Front
Standard
37.946 — 37.963 (1.4939 — 1.4946)
Center, rear 29.946 — 29.963 (1.1790 — 1.1796)
Oil clearance mm (in) Standard 0.037 — 0.072 (0.0015 — 0.0028)
Thrust clearance mm (in) Standard 0.068 — 0.116 (0.0027 — 0.0047)
Cylinder
head
Warping limit
(Mating surface with cylinder block)
mm (in) 0.035 (0.0014)
Grinding limit mm (in) 0.3 (0.012)
Standard height mm (in) 127.5 (5.02)
Valve seat
Seating angle between valve and valve seat 90°
Contacting width between
valve and valve seat
mm (in)
Intake Standard 0.6 — 1.4 (0.024 — 0.055)
Exhaust Standard 1.2 — 1.8 (0.047 — 0.071)
Valve guide
Clearance between the valve
and valve stem
mm (in)
Intake
Standard
0.030 — 0.057 (0.0012 — 0.0022)
Exhaust 0.040 — 0.067 (0.0016 — 0.0026)
Inside diameter mm (in) 6.000 — 6.012 (0.2362 — 0.2367)
Valve stem outer diameters mm (in)
Intake 5.955 — 5.970 (0.2344 — 0.2350)
Exhaust 5.945 — 5.960 (0.2341 — 0.2346)
Valve guide protrusion mm (in) 15.8 — 16.2 (0.622 — 0.638)
Valve
Head edge thickness mm (in)
Intake Standard 1.0 — 1.4 (0.039 — 0.055)
Exhaust Standard 1.3 — 1.7 (0.051 — 0.067)
Overall length mm (in)
Intake 104.4 (4.110)
Exhaust 104.65 (4.1201)
Valve spring
Free length mm (in) 47.32 (1.863)
Tension/spring height N (kgf, lb)/mm (in)
Set
205 — 235
(20.9 — 24.0, 46.1 — 52.8)/36.0 (1.417)
Lift
426 — 490
(43.4 — 50.0, 95.8 — 110)/26.50 (1.043)
Squareness 2.5°, 2.1 mm (0.083 in) or less
Valve lifter
Outer diameter mm (in) Standard 34.959 — 34.975 (1.3763 — 1.3770)
Valve lifter mating surface inner diameter mm (in) Standard 34.994 — 35.016 (1.3777 — 1.3786)
Valve lifter and valve lifter mating surface
clearance
mm (in) Standard 0.019 — 0.057 (0.0007 — 0.0022)
Cylinder
block
Warping limit
(Mating surface with cylinder head)
mm (in) 0.025 (0.0098)
Grinding limit mm (in) 0.1 (0.004)
Standard height mm (in) 201.0 (7.91)
Taper mm (in) Standard 0.015 (0.0006)
Out-of-roundness mm (in) Standard 0.010 (0.0004)
Cylinder to piston clearance at 20°C
(68°F)
mm (in) Standard –0.010 — 0.010 (–0.00039 — 0.00039)
Cylinder inner diameter boring limit (diameter) mm (in) To 100.005 (3.9372)