Subaru LEGACY 2004 - Page 87

ME(H4SO 2.0)-3
MECHANICAL
General Description
Valve seat
Refacing angle 90°
Contacting width mm (in)
Intake Standard 0.8 — 1.4 (0.03 — 0.055)
Exhaust Standard 1.2 — 1.8 (0.047 — 0.071)
Valve guide
Inside diameter mm (in) 6.000 — 6.012 (0.2362 — 0.2367)
Protrusion above head mm (in)
Intake 20.0 — 21.0 (0.787 — 0.827)
Exhaust 16.5 — 17.5 (0.650 — 0.689)
Valve
Head edge thick-
ness
mm (in)
Intake Standard 0.8 — 1.2 (0.03 — 0.047)
Exhaust Standard 1.0 — 1.4 (0.039 — 0.055)
Stem outer diameters mm (in)
Intake 5.950 — 5.965 (0.2343 — 0.2348)
Exhaust 5.945 — 5.960 (0.2341 — 0.2346)
Valve stem gap mm (in) Standard
Intake 0.035 — 0.062 (0.0014 — 0.0024)
Exhaust 0.040 — 0.067 (0.0016 — 0.0026)
Overall length mm (in)
Intake 120.6 (4.75)
Exhaust 121.7 (4.79)
Valve
springs
Free length mm (in) 54.30 (2.1378)
Squareness 2.5°, 2.4 mm (0.094 in)
Tension/spring
height
N (kgf, lb)/mm (in)
Set 214 — 246 (22 — 25, 48 — 55)/ 45.0 (1.772)
Lift 526 — 582 (54 — 59, 119 — 130)/ 34.7 (1.366)
Cylinder
block
Surface warpage limit (mating with cylinder
head)
mm (in) 0.025 (0.00098)
Grinding limit mm (in) 0.1 (0.004)
Standard height mm (in) 201.0 (7.91)
Cylinder inner
diameter mm (in)
2.0 L Standard
A 92.005 — 92.015 (3.6222 — 3.6226)
B 91.995 — 92.005 (3.6218 — 3.6222)
2.5 L Standard
A 99.505 — 99.515 (3.9175 — 3.9179)
B 99.495 — 99.505 (3.9171 — 3.9175)
Taper mm (in) Standard 0.015 (0.0006)
Out-of-roundness mm (in) Standard 0.010 (0.0004)
Piston clearance mm (in) Standard −0.010 — 0.010 (−0.00039 — 0.00039)
Boring limit mm (in) 0.5 (0.020)
Piston
Outer diameter
mm (in)
2.0 L
Standard
A 92.005 — 92.015 (3.6222 — 3.6226)
B 91.995 — 92.005 (3.6219 — 3.6222)
0.25 (0.0098) OS 92.245 — 92.265 (3.6317 — 3.6325)
0.50 (0.0197) OS 92.495 — 92.515 (3.6415 — 3.6423)
2.5 L
Standard
A 99.505 — 99.515 (3.9175 — 3.9179)
B 99.495 — 99.505 (3.9171 — 3.9175)
0.25 (0.0098) OS 99.745 — 99.765 (3.9270 — 3.9278)
0.50 (0.0197) OS 99.995 — 100.015 (3.9368 — 3.9376)
Piston pin standard diameter mm (in) 23.000 — 23.006 (0.9055 — 0.9057)
Piston pin
Outer diameter mm (in) 22.994 — 23.000 (0.9053 — 0.9055)
Standard clearance between piston and piston
pin
mm (in) 0.004 — 0.008 (0.0002 — 0.0003)
Degree of fit
Piston pin must be fitted into position with thumb
at 20°C (68°F).
Piston Ring
Ring closed gap mm (in)
Top ring Standard 0.20 — 0.35 (0.0079 — 0.0138)
Second
ring
2.0 L Standard 0.40 — 0.50 (0.0157 — 0.0197)
2.5 L Standard 0.35 — 0.50 (0.0138 — 0.0197)
Oil ring Standard 0.20 — 0.50 (0.0079 — 0.0197)
Ring groove gap mm (in)
Top ring Standard 0.040 — 0.080 (0.0016 — 0.0031)
Second ring Standard 0.030 — 0.070 (0.0012 — 0.0028)