Toyota Tundra. Manual — part 1827

Fig. 348: Identifying Measuring Area Of No. 1 Chain
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

32

INSPECT NO. 2 CHAIN SUB-ASSEMBLY

a

Using a spring scale, pull the No 2 chain with a force of 147 N (15 kgf, 33 1 lbf) and measure the
length of the No 2 chain by using a vernier caliper

Maximum chain elongation: 146.8 mm (5.78 in.)

HINT:

Perform the measurement at 3 random places If a measurement is greater than the maximum,
replace the No 2 chain

Fig. 349: Identifying Measuring Area Of No. 2 Chain
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

33

INSPECT CAMSHAFT TIMING GEAR ASSEMBLY

a

Wrap the No 1 chain around the gear place for the No 1 chain

b

Using a vernier caliper, measure the timing gear with the No 1 chain

Minimum gear diameter (with chain): 115.5 mm (4.55 in.)

HINT:

The vernier caliper must contact the chain rollers for the measurement

2009 Toyota Tundra

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

If the diameter is less than the minimum, replace the No 1 chain and camshaft timing gear
assembly

Fig. 350: Measuring Timing Gear With No. 1 Chain Using Vernier Caliper
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

c

Wrap the No 2 chain around the gear place for the No 2 chain

d

Using a vernier caliper, measure the timing gear with the No 2 chain

Minimum gear diameter (with chain): 73.1 mm (2.88 in.)

HINT:

The vernier caliper must contact the chain rollers for the measurement

If the diameter is less than the minimum, replace the No 2 chain and camshaft timing gear
assembly

Fig. 351: Measuring Timing Gear With No. 2 Chain Using Vernier Caliper
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

34

INSPECT CAMSHAFT TIMING SPROCKET

a

Wrap the No 2 chain around the sprocket

b

Using a vernier caliper, measure the camshaft timing sprocket diameter with the No 2 chain

Minimum gear diameter (with chain): 73.1 mm (2.88 in.)

2009 Toyota Tundra

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

HINT:

The vernier caliper must contact the chain rollers for the measurement

If the diameter is less than the minimum, replace the No 2 chain and camshaft timing sprocket

Fig. 352: Measuring Camshaft Timing Sprocket Diameter With No. 2 Chain Using Vernier
Caliper
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

35

INSPECT CRANKSHAFT TIMING SPROCKET

a

Wrap the No 1 chain around the sprocket

b

Using a vernier caliper, measure the crankshaft timing sprocket diameter with the No 1 chain

Minimum gear diameter (with chain): 61.0 mm (2.40 in.)

HINT:

The vernier caliper must contact the chain rollers for the measurement

If the diameter is less than the minimum, replace the No 1 chain and crankshaft timing sprocket

Fig. 353: Measuring Crankshaft Timing Sprocket Diameter With No. 1 Chain Using Vernier
Caliper
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

36

INSPECT NO. 1 IDLE GEAR

a

Wrap the No 1 chain around the gear

2009 Toyota Tundra

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

b

Using a vernier caliper, measure the No 1 idle gear with the No 1 chain

Minimum gear diameter (with chain): 61.0 mm (2.40 in.)

HINT:

The vernier caliper must contact the chain rollers for the measurement

If the diameter is less than the minimum, replace the No 1 chain and No 1 idle gear

Fig. 354: Measuring No. 1 Idle Gear With No. 1 Chain Using Vernier Caliper
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

37

INSPECT NO. 1 IDLE GEAR SHAFT OIL CLEARANCE

a

Using a micrometer, measure the No 1 idle gear shaft diameter

Standard idle gear shaft diameter: 22.987 to 23.000 mm (0.905 to 0.906 in.)

Fig. 355: Measuring No. 1 Idle Gear Shaft Diameter Using Micrometer
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

b

Using a caliper gauge, measure the inside diameter of the idle gear

Standard idle gear inside diameter: 23.02 to 23.03 mm (0.906 to 0.907 in.)

c

Subtract the idle gear shaft diameter measurement from the idle gear inside diameter measurement

Standard oil clearance: 0.020 to 0.043 mm (0.000787 to 0.00169 in.)

2009 Toyota Tundra

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