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General Description
MECHANICAL
Cylinder
head

Valve seat

Surface warpage limit (mating with cylinder block)
Grinding limit
Standard height
Refacing angle

STD
Limit
mm (in)
STD
Exhaust
Limit
mm (in)
Intake
mm (in)
Exhaust
STD
Intake
Limit
mm (in)
STD
Exhaust
Limit
Intake
mm (in)
Exhaust
Intake
STD
mm (in)
Exhaust
Limit

Intake
mm (in)
Exhaust
mm (in)
mm (in)
Intake

Contacting width

Inner diameter
Valve guide

Protrusion above head

Head edge thickness

Valve

mm (in)
mm (in)
mm (in)

Stem outer diameter

Stem oil clearance

Overall length
Free length
Squareness
Valve spring

Set
Tension/spring height

N (kgf, lb)/mm (in)
Lift

Surface warpage limit (mating with cylinder head)
Grinding limit
Cylinder inner
diameter
Cylinder
block

2.0 L
mm (in)
2.5 L

Taper
Out-of-roundness
Piston clearance
Boring

2.0 L

Piston

Outer diameter

mm (in)
2.5 L

Piston pin standard diameter

mm (in)
mm (in)

A
B
A
STD
B
STD
mm (in)
Limit
STD
mm (in)
Limit
STD
mm (in)
Limit
mm (in)
A
STD
B
0.25 (0.0098) OS
0.50 (0.0197) OS
A
STD
B
0.25 (0.0098) OS
0.50 (0.0197) OS
mm (in)
STD

ME(H4SO)-3

0.05 (0.0020)
0.1 (0.004)
97.5 (3.84)
90°
1.1 (0.043)
1.8 (0.070)
1.5 (0.059)
2.2 (0.087)
6.000 — 6.012 (0.2362 — 0.2367)
20.0 — 20.5 (0.787 — 0.807)
16.5 — 17.0 (0.650 — 0.669)
1.0 (0.039)
0.6 (0.024)
1.2 (0.047)
0.6 (0.024)
5.950 — 5.965 (0.2343 — 0.2348)
5.945 — 5.960(0.2341 — 0.2346)
0.035 — 0.062 (0.0014 — 0.0024)
0.040 — 0.067 (0.0016 — 0.0026)
0.15 (0.0059)
120.6 (4.75)
121.7 (4.79)
54.30 (2.1378)
2.5°, 2.4 (0.094)
214 — 246 (22 — 25, 48 — 55)/
45.0 (1.772)
526 — 582 (54 — 59, 119 — 130)/
34.7 (1.366)
0.05 (0.0020)
0.1 (0.004)
92.005 — 92.015 (3.6222 — 3.6226)
91.995 — 92.005 (3.6218 — 3.6222)
99.505 — 99.515 (3.9175 — 3.9179)
99.495 — 99.505 (3.9171 — 3.9175)
0.015 (0.0006)
0.050 (0.0020)
0.010 (0.0004)
0.050 (0.0020)
0.010 — 0.030 (0.0004 — 0.0012)
0.050 (0.0020)
0.5 (0.020)
91.985 — 91.995 (3.6214 — 3.6218)
91.975 — 91.985 (3.6211 — 3.6214)
92.225 — 92.235 (3.6309 — 3.6313)
92.475 — 92.485 (3.6407 — 3.6411)
99.485 — 99.495 (3.9167 — 3.9171)
99.475 — 99.485 (3.9163 — 3.9167)
99.725 — 99.735 (3.9262 — 3.9266)
99.975 — 99.985 (3.9360 — 3.9364)
23.000 — 23.006 (0.9055 — 0.9057)