S.D.S. — Inspection and Adjustment (Cont'd) — Valve Seat

EM-60spec table

Source figures are primarily annotated diagrams; spec tables on this page are reconstructed from the figure annotations (no separate textual table is printed). Values transcribed verbatim, including the 45° tier-angle distinction between intake (1.34-1.63 contacting) and exhaust (1.70-2.12).

Continued from EM-59

SERVICE DATA AND SPECIFICATIONS (S.D.S.)

Inspection and Adjustment (Cont'd)

Valve seat

Valve seat — Intake

Parameter	Standard	Oversize
Seat-face angles	30° / 45° / 60°	30° / 45° / 60°
Contacting width	1.34 - 1.63 (0.0528 - 0.0642)	1.34 - 1.63 (0.0528 - 0.0642)
Seat face height	4.3 (0.169)	4.3 (0.169)
Cutter diameter — bottom (60°)	25.3 - 25.5 (0.996 - 1.003) dia.	25.3 - 25.5 (0.996 - 1.003) dia.
Cutter diameter — middle (45°)	27.0 - 27.2 (1.062 - 1.070) dia.	27.0 - 27.2 (1.062 - 1.070) dia.
Cutter diameter — top (30°) / outer seat	28.7 - 28.9 (1.129 - 1.137) dia.*	28.7 - 28.9 (1.129 - 1.137) dia.*
Cylinder head valve-seat bore (oversize machining)	—	29.500 - 29.516 (1.161 - 1.162) dia.*

Seat-face angles

Standard30° / 45° / 60°

Oversize30° / 45° / 60°

Contacting width

Standard1.34 - 1.63 (0.0528 - 0.0642)

Oversize1.34 - 1.63 (0.0528 - 0.0642)

Seat face height

Standard4.3 (0.169)

Oversize4.3 (0.169)

Cutter diameter — bottom (60°)

Standard25.3 - 25.5 (0.996 - 1.003) dia.

Oversize25.3 - 25.5 (0.996 - 1.003) dia.

Cutter diameter — middle (45°)

Standard27.0 - 27.2 (1.062 - 1.070) dia.

Oversize27.0 - 27.2 (1.062 - 1.070) dia.

Cutter diameter — top (30°) / outer seat

Standard28.7 - 28.9 (1.129 - 1.137) dia.*

Oversize28.7 - 28.9 (1.129 - 1.137) dia.*

Cylinder head valve-seat bore (oversize machining)

Standard—

Oversize29.500 - 29.516 (1.161 - 1.162) dia.*

Valve seat — Exhaust

Parameter	Standard	Oversize
Seat-face angles	10° / 45° / 60°	10° / 45° / 60°
Contacting width	1.70 - 2.12 (0.0669 - 0.0835)	1.70 - 2.12 (0.0669 - 0.0835)
Seat face height	3.9 (0.153)	3.9 (0.153)
Cutter diameter — bottom (60°)	22.0 - 22.2 (0.866 - 0.874) dia.	22.0 - 22.2 (0.866 - 0.874) dia.
Cutter diameter — middle/upper (45°)	23.7 - 23.9 (0.933 - 0.940) dia.	23.7 - 23.9 (0.933 - 0.940) dia.*
Cylinder head valve-seat bore (oversize machining)	—	22.500 - 22.516 (0.885 - 0.886) dia.*

Seat-face angles

Standard10° / 45° / 60°

Oversize10° / 45° / 60°

Contacting width

Standard1.70 - 2.12 (0.0669 - 0.0835)

Oversize1.70 - 2.12 (0.0669 - 0.0835)

Seat face height

Standard3.9 (0.153)

Oversize3.9 (0.153)

Cutter diameter — bottom (60°)

Standard22.0 - 22.2 (0.866 - 0.874) dia.

Oversize22.0 - 22.2 (0.866 - 0.874) dia.

Cutter diameter — middle/upper (45°)

Standard23.7 - 23.9 (0.933 - 0.940) dia.

Oversize23.7 - 23.9 (0.933 - 0.940) dia.*

Cylinder head valve-seat bore (oversize machining)

Standard—

Oversize22.500 - 22.516 (0.885 - 0.886) dia.*

Specification	Value
Valve seat face angles — IntakeStandard and Oversize	30° / 45° / 60°degrees
Valve seat face angles — ExhaustStandard and Oversize	10° / 45° / 60°degrees
Intake seat contacting widthStandard and Oversize	1.34 - 1.63 (0.0528 - 0.0642)mm (in)
Exhaust seat contacting widthStandard and Oversize	1.70 - 2.12 (0.0669 - 0.0835)mm (in)

Valve seat face angles — IntakeStandard and Oversize

30° / 45° / 60°degrees

Valve seat face angles — ExhaustStandard and Oversize

10° / 45° / 60°degrees

Intake seat contacting widthStandard and Oversize

1.34 - 1.63 (0.0528 - 0.0642)mm (in)

Exhaust seat contacting widthStandard and Oversize

1.70 - 2.12 (0.0669 - 0.0835)mm (in)

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