TM 9-2320-366-34-4
20-3. CYLINDER HEAD REPAIR (CONT)
(9) Inspect 12 valve seat inserts (7) for damage and wear.
Refer to Table 20-3 Valve Seat Insert Specifications.
Table 20-3. Valve Seat Insert Specifications
Intake valve seat insert bore diameter
(J)
1.9608-1.9708 in.
(4.998-5.005 cm)
Exhaust valve seat insert bore diameter
(J)
1.6853-1.6953 in.
(4.280-4.306 cm)
Intake valve seat insert face angle
(K)
29.75-30.75 degrees
0.52-0.536 (rad)
Exhaust valve seat insert face angle
(K)
45-46 degrees
0.785-0.803 (rad)
Seating face outside diameter, intake
(L)
1.89 in. (4.8 cm)
Seating face outside diameter, exhaust
(L)
1.59 in. (4.03 cm)
Valve seat bore depth, intake
(M)
0.389-0.399 in. (0.98-
1.01 cm)
Valve seat bore depth, exhaust
(M)
0.389-0.399 in. (0.98-
1.01 cm)
20-14
