lightly tap out the piston pin and remove
the connecting rod.

Figure 19.

NOTE
• The piston and pin are a
matched set.
• Arrange the pistons, pins, rings,
connecting rods, and bearings in
the correct order.

For additional information, refer to TIS, applicable model and model year Repair Manual:
• 2010 / 2011 / 2012 HS 250h:
Engine/Hybrid System – Engine Mechanical – “2AZ-FXE Engine Mechanical:
Cylinder Block: Disassembly”

© 2016 Lexus, a division of Toyota Motor Sales, USA

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2AZ-FXE Oil Consumption

Repair Procedure (Continued)

4. Inspect piston, pin, connecting rod and bearings to determine replacement part numbers and
measure to determine if parts are suitable for re-use.
NOTE
The following steps are required to determine the correct replacement part numbers.

HINT
If necessary, sublet the following specialized and precision operations to a local engine
machining shop.

A. Inspect the piston pin diameter mark located
on the top face in order to determine correct
replacement parts. Piston type will be: A, B,
or C.

Figure 20.

A

B

NOTE
Due to carbon build up, piston face
may need to be cleaned before reading
designated piston type. If piston type
cannot be found, reference connecting rod.
1
2

PART NUMBER

2

13211-28150-A0
13211-28150-B0
13211-28150-C0
NOTE

3

Although “B” pistons are the most
commonly used in production, any engine
can have any combination of all 3 pistons
(A, B, C). The approximate production mix
for pistons is as follows: A = 4%, B = 92%,
C = 4%.
A

TMMK Made

B

TMC Made

1

Front Mark

2

Piston Pin Bore Diameter Mark

3

Connecting Rod Mark

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1

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2AZ-FXE Oil Consumption

Repair Procedure (Continued)

(1) Using a micrometer, measure the piston
pin diameter.

Figure 21.

Standard Piston Pin Diameter: 21.997 to
22.006 mm (0.8660 to 0.8664 in.)

Ensure the connecting rod small end
bore diameter measurement is within
specification for the piston pin diameter
mark inspected previously. If the
diameter is NOT as specified, replace
the piston pin.

1

NOTE
Piston pin type is a matched set with
the piston and connecting rod. For
example: if the piston removed has a
"B" marking, the piston pin diameter
should be 22.001 - 22.003 mm

2

1

1

5 mm (0.20 in.)

2

30 mm (1.18 in.)

PART NUMBER

SPECIFIED CONDITION

13251-28020-A0

21.997 to 22.000 mm (0.8660 to 0.8661 in.)

13251-28020-B0

22.001 to 22.003 mm (0.8662 to 0.8663 in.)

13251-28020-C0

22.004 to 22.006 mm (0.8663 to 0.8664 in.)

© 2016 Lexus, a division of Toyota Motor Sales, USA

L-SB-0006-15

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2AZ-FXE Oil Consumption

Repair Procedure (Continued)

(2) Using a caliper gauge, measure the
connecting rod small end bore diameter.

Figure 22.

Standard Connecting Rod Small
End Bore Diameter:
22.005 to 22.014 mm (0.8663 to 0.8667 in.)

Ensure the connecting rod small end
bore diameter measurement is within
specification for the piston pin diameter
mark inspected previously. If the
diameter is NOT as specified, replace
the connecting rod.
NOTE
Connecting Rod type is a matched
set with the piston and piston pin.
For example: if the piston removed
has a "B" marking, the connecting
rod small end bore diameter should
be 22.009 - 22.011 mm.

PART NUMBER

SPECIFIED CONDITION

13201-29686-A0

22.005 to 22.008 mm (0.8663 to 0.8665 in.)

13201-29686-B0

22.009 to 22.011 mm (0.8665 to 0.8666 in.)

13201-29686-C0

22.012 to 22.014 mm (0.8666 to 0.8667 in.)

B. Inspect the connecting rod bolt.

Figure 23.

Using vernier calipers, measure the tension
portion diameter of the bolt.
Standard Diameter: 7.2 to 7.3 mm
(0.283 to 0.287 in.)
Minimum Diameter: 7.0 mm (0.276 in.)

If the diameter is less than the minimum,
replace the connecting rod bolt.
For additional information, refer to TIS, applicable model and model year Repair Manual:
• 2010 HS 250h:
Engine/Hybrid System – Engine Mechanical – “2AZ-FXE Engine Mechanical: Cylinder
Block: Disassembly”

© 2016 Lexus, a division of Toyota Motor Sales, USA

L-SB-0006-15

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2AZ-FXE Oil Consumption

Repair Procedure (Continued)

5. Install the NEW pistons and rings and reassemble the engine in reverse order of disassembly.
NOTE
3 piece oil control ring installation procedure is NOT included in the Repair Manual. Follow the
steps below to install the piston rings and refer to the repair manual for all other reassembly
steps.

A. Install Piston Ring Set.

Figure 24.

1

2

3
1

Upper Side Rail - Oil Control Ring

2

Oil Ring Expander

3

Lower Side Rail - Oil Control Ring

(1) Install the oil ring expander and 2 oil ring side rails by hand.
NOTE
When installing oil expander ring, do NOT overlap the ends.

© 2016 Lexus, a division of Toyota Motor Sales, USA

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2AZ-FXE Oil Consumption

Repair Procedure (Continued)
Figure 25.

1
2

3
4

5

1

Push Oil Ring Expander Surface Into Piston
With Thumb

2

Normal Condition

3

Align End of Ring

4

NG Condition

5

Do NOT Overlap

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2AZ-FXE Oil Consumption

Repair Procedure (Continued)

(2) Using a piston ring expander, install
the No. 1 compression ring and No. 2
compression ring with the code mark
positioned as shown in the illustration.

Figure 26.

NOTE
Install the No. 2 compression ring
with the code mark facing upward.

3
1

2
A

A

Code Mark

1

No. 1 Compression Ring

2

No. 2 Compression Ring

3

Upward

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2AZ-FXE Oil Consumption

Repair Procedure (Continued)

(3) Position the piston rings so that the ends
are as shown in the illustration.

Figure 27.

A
3

1

5

7

6

2

4
B
3

1
5

7

2
6
4

A

TMC Made

B

TMMK Made

1

No. 1 Compression Ring

2

No. 2 Compression Ring

3

Oil Ring Expander

4

Upper Side Rail – Oil Control Ring

5

Lower Side Rail – Oil Control Ring

6

Front Mark

7

Front Side

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2AZ-FXE Oil Consumption

Repair Procedure (Continued)

B. Install the NEW pistons and reassemble the engine in reverse order of disassembly.
For additional information, refer to TIS, applicable model and model year Repair Manual:
• 2010 HS 250h:
Engine/Hybrid System – Engine Mechanical – “2AZ-FXE Engine Mechanical: Engine
Unit: Reassembly”
• 2010 HS 250h:
Engine/Hybrid System – Engine Mechanical – “2AZ-FXE Engine Mechanical: Cylinder
Block: Reassembly”
• 2010 HS 250h:
Engine/Hybrid System – Engine Mechanical – “2AZ-FE Engine Mechanical: Cylinder
Head Gasket: Installation”
6. Install the engine assembly.
Refer to TIS, applicable model and model year Repair Manual:
• 2010 HS 250h:
Engine/Hybrid System – Engine Mechanical – “2AZ-FXE Engine Mechanical: Engine
Assembly: Installation”
7. Test drive the vehicle to verify normal operation.

© 2016 Lexus, a division of Toyota Motor Sales, USA