Toyota Tundra. Manual — part 1885

There are 3 standard diameter sizes, marked "1", "2" and "3" The mark is stamped on the piston
top

1

Using a micrometer, measure the piston diameter at a position that is 6 7 mm (0 264 in )
downward from the center of the piston pin hole

Fig. 274: Identifying Piston Oil Clearance Dimension
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

Standard piston diameter

PISTON SPECIFICATION

2

Measure the cylinder bore diameter in the thrust directions

3

Subtract the piston diameter measurement from the cylinder bore diameter measurement

Standard oil clearance: 0.045 to 0.066 mm (0.00178 to 0.00259 in.)

Maximum oil clearance: 0.13 mm (0.00512 in.)

If the oil clearance is greater than the maximum, replace all 8 pistons and rebore all 8
cylinders If necessary, replace the cylinder block

HINT:

When replacing the cylinder block, use a piston with the same number mark as the cylinder
diameter marked on the cylinder block

Number Mark

Specified Condition

Mark 1

93 942 to 93 952 mm (3 6985 to 3 6989 in )

Mark 2

93 952 to 93 960 mm (3 6989 to 3 6992 in )

Mark 3

93 960 to 93 970 mm (3 6992 to 3 6996 in )

2009 Toyota Tundra

2009 ENGINE Engine Mechanical (2UZ-FE) - Tundra

Fig. 275: Identifying Piston Head Mark Location
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

c

Inspect the piston pin fit

1

Heat the piston to approximately 60°C (140°F), and push the piston pin into the piston pin
hole with your thumb

Fig. 276: Identifying Piston Pin Fit
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

4

INSPECT PISTON PIN OIL CLEARANCE

a

Using a caliper gauge, measure the inside diameter of the piston pin hole

2009 Toyota Tundra

2009 ENGINE Engine Mechanical (2UZ-FE) - Tundra

Standard piston pin hole inside diameter

PISTON PIN OIL CLEARANCE

b

Using a micrometer, measure the piston pin diameter

Fig. 277: Measuring Piston Pin Diameter Using Micrometer
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

Standard piston pin diameter

PISTON PIN SPECIFICATION

c

Subtract the piston pin diameter measurement from the piston pin hole diameter measurement

Standard oil clearance: -0.002 to 0.004 mm (-0.0000787 to 0.000157 in.)

If the oil clearance is greater than the maximum, replace the piston and piston pin as a set

d

Inspect the piston pin oil clearance

1

Using a caliper gauge, measure the inside diameter of the connecting rod bush

Mark

Specified Condition

A

21 998 to 22 001 mm

(0 86606 to 0 86618 in )

B

22 002 to 22 004 mm

(0 86622 to 0 86629 in )

C

22 005 to 22 007 mm

(0 86634 to 0 86642 in )

Item

Specified Condition

A

21 997 to 22 000 mm

(0 86602 to 0 86614 in )

B

22 001 to 22 003 mm

(0 86618 to 0 86626 in )

C

22 004 to 22 006 mm

(0 86630 to 0 86638 in )

2009 Toyota Tundra

2009 ENGINE Engine Mechanical (2UZ-FE) - Tundra

Standard bush inside diameter: 22.005 to 22.014 mm (0.866 to 0.867 in.)

If the bush inside diameter is not as specified, replace the connecting rod sub-assembly and
check the oil clearance

Fig. 278: Measuring Inside Diameter Of Connecting Rod Bush Using Caliper Gauge
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

2

Subtract the piston pin diameter measurement from the bush inside diameter measurement

Standard oil clearance: 0.005 to 0.011 mm (0.000197 to 0.000433 in.)

Maximum oil clearance: 0.05 mm (0.00197 in.)

If the oil clearance is greater than the maximum, replace the connecting rod If necessary,
replace the piston and piston pin with a new piston and pin set

5

INSPECT PISTON RING SET

a

Inspect the piston ring groove clearance

1

Using a feeler gauge, measure the clearance between a new piston ring and the wall of the
ring groove

Standard ring groove clearance

RING GROOVE CLEARANCE SPECIFICATION

If the clearance is not as specified, replace the piston

Piston Ring

Specified Condition

No 1

0 030 to 0 080 mm (0 00181 to 0 00314 in )

No 2

0 020 to 0 060 mm (0 000787 to 0 00236 in )

2009 Toyota Tundra

2009 ENGINE Engine Mechanical (2UZ-FE) - Tundra