5_108.bk Page 169 Thursday, October 4, 2001 11:45 AM
REPAIR INSTRUCTIONS Valve Seat Insert Counterbore
Inspection
Refer to Figure 223.
Refer to Figure 224.
r
r
r
Valve seat at counterbore depth (3): —
Exhaust: 0.372–0.376 inch (9.499–9.55 mm)
—
Inlet: 0.360–0.364 inch (9.144–9.246 mm)
Inlet valve seat insert counterbore diameter (4): 1.8285–1.8295 inches (46.4439–46.4693 mm)
1. With valve seat insert removed from cylinder head (2), clean surfaces thoroughly with wire brush. 2. Check surface finish for smoothness. Check counterbore diameter with an inside diameter micrometer (1). Refer back to specifications listed in Figure 223. 224
Exhaust valve seat counterbore diameter (5): 1.6875–1.6885 inches (42.8625–42.8879 mm)
223
Figure 224 — Checking Counterbore Dimensions 1. Inside Diameter Micrometer
2. Cylinder Head
Figure 223 — Valve Seat Insert Counterbore Dimensions 1. Exhaust Valve Guide 2. Inlet Valve Guide 3. Valve Seat at Counterbore Depth
4. Inlet Valve Seat Counterbore Diameter 5. Exhaust Valve Seat Counterbore Diameter
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