Toyota 2GR-FE Manual page 99

EM–98
Margin Thickness
EM
Margin Thickness
2GR-FE ENGINE MECHANICAL – ENGINE UNIT
A121379E01
Overall Length
A121380E01
20. INSPECT EXHAUST VALVE
A124001
A121382E01
Overall Length
21. INSPECT INTAKE VALVE SEAT
A121383E01
(b) Using vernier calipers, measure the valve head
margin thickness.
Standard margin thickness:
1.0 mm (0.03937 in.)
Minimum margin thickness:
0.5 mm (0.0197 in.)
If the margin thickness is less than the minimum,
replace the intake valve.
(c) Using vernier calipers, measure the valve's overall
length.
Standard overall length:
105.85 mm (4.1673 in.)
Minimum overall length:
105.35 mm (4.1476 in.)
If the overall length is less than the minimum,
replace the intake valve.
(a) Using a micrometer, measure the diameter of the
valve stem.
Valve stem diameter:
5.465 to 5.480 mm (0.2151 to 0.2157 in.)
If the valve stem is not as specified, check the oil
clearance.
(b) Using vernier calipers, measure the valve head
margin thickness.
Standard margin thickness:
1.0 mm (0.0397 in.)
Minimum margin thickness:
0.5 mm (0.0197 in.)
If the margin thickness is less than the minimum,
replace the exhaust valve.
(c) Using vernier calipers, measure the valve's overall
length.
Standard overall length:
110.40 mm (4.3464 in.)
Minimum overall length:
109.90 mm (4.3268 in.)
If the overall length is less than the minimum,
replace the exhaust valve.
(a) Apply a light coat of Prussian blue to the valve face.