Acura CSX. Instruction — page 59

03

04

05

Inspection

Piston Pin Diameter
Standard (New): 21.961

21.965 mm

(0.8646

0.8648 in.)

Service Limit:

21.953 mm (0.8643 in.)

7-19

4. Heat the piston and connecting rod assembly to

about 70 °C (158 °F), then remove the piston pin.

NOTE: Inspect the piston, the piston pin, and the
connecting rod when they are at room temperature.

1. Measure the diameter of the piston pin.

2. Zero the dial indicator to the piston pin diameter.

06

07

08

09

Piston Pin-to-Piston Clearance
Standard (New):

0.005 to

0.002 mm

(

0.00020 to

0.00008 in.)

Service Limit:

0.005 mm (0.0002 in.)

Piston Pin-to-Connecting Rod Clearance
Standard (New): 0.005

0.015 mm

(0.0002

0.0006 in.)

Service Limit:

0.02 mm (0.0008 in.)

Reassembly

7-20

Engine Block

A

3. Check the difference between the piston pin

diameter and the piston pin hole diameter in the
piston.

4. Measure the piston pin-to-connecting rod clearance.

1. Install a piston pin snap ring (A) only on one side.

2. Coat the piston pin bore in the piston, the bore in

the connecting rod, and the piston pin with new
engine oil.

3. Heat the piston to about 70 °C (158 °F).

*01

01

SNR9A00A18360245611KBAT00

7-21

7-21

Piston Ring Replacement

D

C

F

E

B

A

B

A

4. Assemble the piston (A) and the connecting rod (B)

with the arrow (C) and the embossed mark (D) on
the same side. Install the piston pin (E).

5. Install the remaining snap ring (F).

6. Turn the snap rings in the ring grooves until the

end gaps are positioned at the bottom of the piston.

1. Remove the piston from the engine block (see page

7-13).

2. Using a ring expander (A), remove the old piston

rings (B).

3. Clean all ring grooves thoroughly with a squared-

off broken ring or ring groove cleaner with a blade
to fit the piston grooves.
The top and 2nd ring grooves are 1.2 mm (0.05 in.)
wide. The oil ring groove is 2.0 mm (0.08 in.) wide.
File down a blade if necessary.
Do not use a wire brush to clean the ring grooves,
or cut the ring grooves deeper with the cleaning
tools.

NOTE: If the piston is to be separated from the
connecting rod, do not install new rings yet.

This illustration shows K20Z2 engine.

*01

01

SNR9A00A18360245611KBAT00

7-21

7-21

Piston Ring Replacement

D

C

F

E

B

A

B

A

4. Assemble the piston (A) and the connecting rod (B)

with the arrow (C) and the embossed mark (D) on
the same side. Install the piston pin (E).

5. Install the remaining snap ring (F).

6. Turn the snap rings in the ring grooves until the

end gaps are positioned at the bottom of the piston.

1. Remove the piston from the engine block (see page

7-13).

2. Using a ring expander (A), remove the old piston

rings (B).

3. Clean all ring grooves thoroughly with a squared-

off broken ring or ring groove cleaner with a blade
to fit the piston grooves.
The top and 2nd ring grooves are 1.2 mm (0.05 in.)
wide. The oil ring groove is 2.0 mm (0.08 in.) wide.
File down a blade if necessary.
Do not use a wire brush to clean the ring grooves,
or cut the ring grooves deeper with the cleaning
tools.

NOTE: If the piston is to be separated from the
connecting rod, do not install new rings yet.

This illustration shows K20Z2 engine.

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