toyota Workshop Repair Guides

Toyota Workshop Service and Repair Manuals

Valve, Intake/Exhaust|Inspection|Page 1365 > < Valve, Intake/Exhaust|Specifications
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Valve: Testing and Inspection
Inspection

1. Inspect and grind valves.

(a)

Grind the valve enough to remove pits and carbon.

(b) Check that the valve is ground to the correct valve face angle.

Valve face angle: 44.5° 

(c)

Check the valve head margin thickness.
Standard margin thickness: 0.8 - 1.2 mm (0.031 - O.047 inch)
Minimum margin thickness: 0.5 mm (0.020 inch)
If the margin thickness is less than minimum, replace the valve.

(d) Check the valve overall length.

Standard overall length:

Intake: 87.45 mm (3.4429 inch)
Exhaust: 87.84 mm (3.4583 inch)

Minimum overall length:

Intake: 86.95 mm (3.4232 inch)
Exhaust: 87.34 mm (3.4386 inch)

If the overall length is less than minimum, replace the valve.

(e)

Check the surface of the valve stem tip for wear.

Valve, Intake/Exhaust|Inspection|Page 1365 > < Valve, Intake/Exhaust|Specifications