Page 242
REPAIR INSTRUCTIONS, PART 1
— Exhaust Oversize Service (0.015):
1.707–1.708 inches
(43.358–43.383 mm)
— Exhaust Oversize Service (0.031):
1.723–1.724 inches
(43.764–43.790 mm)
— Exhaust Oversize Service (0.047):
1.739–1.740 inches
(44.171–44.196 mm)
— Exhaust Oversize Service (0.062):
1.754–1.755 inches
(44.551–44.577 mm)
앫 Intake valve seat width (3) —
0.060 ± 0.005 inch (1.524 ± 0.127 mm)
앫 Exhaust valve seat width (3) —
0.069 ± 0.005 inch (1.753 ± 0.127 mm)
260
Figure 260 — Valve Seat Insert Dimensions (Exhaust
Seat Shown)
INSPECTION
Visually inspect the valve seat inserts for
looseness, cracks or other conditions that may
result in improper operation. Replace seats as
necessary.
VALVE SEAT INSERT REMOVAL
Valve seat inserts are designed with a smooth
radiused inner surface to achieve an optimum
airflow. Because of the radius, cutting a groove
on the inner surface for removal of the insert is
nearly impossible and no longer recommended.
Instead, the inner upper edge of the insert has a
chamfer to accept a collet tool. The collet,
PT6390-4, is used in combination with the lifting
bridge, T-handle and shaft assembly from
extractor kit PT6391 (Figure 261), to remove both
inlet and exhaust seat inserts.
Collet PT6390-4 is not included in the basic kit
PT6391.
1. Valve Seat Insert Face
Angle
2. Valve Seat Insert
Diameter
3. Valve Seat Width
4. Valve Seat
5-111.bk Page 242 Monday, July 10, 2006 2:26 PM
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