Toyota Tundra. Manual — part 1818

Fig. 285: Checking Intake Ports, Exhaust Ports And Cylinder Surface For Cracks
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

4

CLEAN VALVE

a

Using a gasket scraper, chip off any carbon from the valve head

b

Using a wire brush, thoroughly clean the valve

Fig. 286: Cleaning Valve Using Wire Brush
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

5

INSPECT VALVE

a

Using a micrometer, measure the diameter of the valve stem

1

Using a micrometer, measure the diameter of the valve stem

Standard valve stem diameter

VALVE STEM DIAMETER SPECIFICATION

Fig. 287: Measuring Diameter Of Valve Stem Using Micrometer
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

Item

Specified Condition

Intake

5 470 to 5 485 mm (0 2154 to

0 2159 in )

Exhaust

5 465 to 5 480 mm (0 2152 to

0 2156 in )

2009 Toyota Tundra

2009 ENGINE Engine Mechanical (1GR-FE) - Tundra

b

Inspect the valve face angle

1

Grind the valve enough to remove pits and carbon

2

Check that the valve is ground to the correct valve face angle

Standard valve face angle: 44.5°

Fig. 288: Identifying Valve Face Angle
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

c

Using a vernier caliper, measure the valve head margin thickness

1

Using a vernier caliper, check the valve head margin thickness

Standard margin thickness: 1.0 mm (0.0394 in.)

Minimum margin thickness: 0.5 mm (0.0197 in.)

If the margin thickness is less than the minimum, replace the valve

Fig. 289: Measuring Valve Head Margin Thickness Using Vernier Caliper
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

d

Using a vernier caliper, measure the valve's overall length

1

Using a vernier caliper, check the overall length

Standard overall length

OVERALL LENGTH SPECIFICATION

2009 Toyota Tundra

2009 ENGINE Engine Mechanical (1GR-FE) - Tundra

Fig. 290: Measuring Valve Overall Length Using Vernier Caliper
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

Minimum overall length

OVERALL LENGTH SPECIFICATION

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

e

Inspect the valve stem tip

1

Check the surface of the valve stem tip for wear

If the valve stem tip is worn, resurface the tip with a grinder or replace the valve

Fig. 291: Resurfacing Valve Stem Tip Using Grinder
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

Item Specified Condition

Intake 106 95 mm (4 21 in )

Exhaust 105 80 mm (4 15 in )

Item Specified Condition

Intake 106 40 mm (4 19 in )

Exhaust 105 30 mm (4 15 in )

NOTE:

Do not grind off more than the minimum length.

2009 Toyota Tundra

2009 ENGINE Engine Mechanical (1GR-FE) - Tundra

6

CLEAN VALVE SEAT

a

Using a 45° carbide cutter, resurface the valve seats

b

Clean the valve seats

Fig. 292: Cleaning Valve Seat
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

7

INSPECT VALVE SEAT

a

Apply a light coat of Prussian blue to the valve face

b

Lightly press the valve face against the valve seat

c

Check the valve face and valve seat by using the following procedure

1

If Prussian blue appears around the entire valve face, the valve face is concentric If not,
replace the valve

2

If Prussian blue appears around the entire valve seat, the guide and valve face are concentric
If not, resurface the valve seat

3

Check that the seat contacts the middle of the valve face with the width below

Standard width: 1.0 to 1.4 mm (0.0394 to 0.0551 in.)

Fig. 293: Inspecting Valve Seat
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

8

INSPECT INNER COMPRESSION SPRING

NOTE:

Do not rotate the valve.

2009 Toyota Tundra

2009 ENGINE Engine Mechanical (1GR-FE) - Tundra