Valve Mechanism

Valve mechanism





1. Inspect each valve for following:
a. Damaged or bent valve stem
b. Rough or damaged face
c. Damaged or unevenly worn stem tip
2. Resurface or replace valve as needed.
Margin thickness
Intake: 0.472 inch (1.2 mm)
Exhaust: 0.472 inch (1.2 mm)





3. Measure length of each valve.
Length
Intake: 4.052 inch (102.92 mm)
Exhaust: 3.993 inch (101.42 mm)





4. Measure diameter of each valve stem.
Diameter
Intake: 0.2350 - 0.2356 inch (5.970 - 5.985 mm)
Exhaust: 0.2348 - 0.2354 inch (5.965 - 5.980 mm)





5. Measure inside diameter of each valve guide at points shown in figure.
Diameter intake and exhaust valve guide: 0.2367 - 0.2374 inch (6.01 - 6.03 mm)





6. Calculate valve stem-to-valve guide clearance. Subtract outer diameter of valve stem from inside diameter of respective valve guide.
Clearance
Intake valve: 0.0010 - 0.0023 inch (0.025 - 0.060 mm)
Exhaust valve: 0.0012 - 0.0025 inch (0.030 - 0.065 mm)
Max: 0.008 inch (0.20 mm)
7. If clearance exceeds specification, replace valve, and/or valve guide.





8. Measure protrusion height of each valve guide. Replace valve guide as needed.
(A) Intake: 0.539 - 0.563 inch (13.7 - 14.3 mm)
(B) Exhaust: 0.658 - 0.681 inch (16.7 - 17.3 mm)





Notice: Intake and exhaust valve guides are different. Be sure to use correct valve guide.