Acura CSX. Instruction — page 56

02

03

04

Main Bearing Selection

Crankshaft Bore Code Location

Main Journal Code Location

7-7

No. 1 JOURNAL
(PULLEY END)

No. 5 JOURNAL
(TRANSMISSION END)

No. 1 JOURNAL

No. 5 JOURNAL

1. Numbers, letters or bars have been stamped on the

end of the engine block as a code for the size of
each of the five main journal bores. Write down the
crank bore codes.
If you cannot read the codes because of
accumulated dirt and dust, do not scrub them with
a wire brush or scraper. Clean them only with
solvent or detergent.

2. The main journal codes are stamped on the

crankshaft in either location.

05

01

SNR9A00A18316217201KBAT00

Connecting Rod Bearing Clearance
Inspection

Connecting Rod Bearing-to-Journal Oil Clearance
K20Z2 engine
Standard (New):

0.020

0.050 mm

(0.0008

0.0020 in.)

Service Limit:

0.060 mm (0.0024 in.)

K20Z3 engine
Standard (New):

0.032

0.066 mm

(0.0013

0.0026 in.)

Service Limit:

0.077 mm (0.0030 in.)

7-8

7-8

Engine Block

Connecting Rod Bearing
Replacement

Larger crank bore

1 or
A or I

2 or
B or II

3 or
C or III

4 or
D or IIII

Smaller bearing (Thicker)

Blue

Pink

Yellow

Green

Green/
Brown

Brown

Green

Green/
Brown

Brown

Green

Green/
Brown

Brown

Green

Green/
Brown

Brown

Black

Black/
Blue

Crank
bore
code

Pink/
Yellow

Yellow

Yellow

Pink/
Yellow

Black

Black

Black/
Blue

Main
journal
code

1

2

3

4

5

6

Smaller
main
journal

Smaller
bearing
(Thicker)

3. Use the crank bore codes and crank journal codes

to select the appropriate replacement bearings
from the following table.

NOTE:

• Color code is on the edge of the bearing.
• When using bearing halves of different colors, it

does not matter which color is used in the top or
bottom.

1. Remove the oil pump (see page 8-16).

2. Remove the baffle plates (see step 8 on page 7-13).

3. Remove the connecting rod cap and the bearing

half.

4. Clean the crankshaft rod journal and the bearing

half with a clean shop towel.

5. Place plastigage across the rod journal.

6. Reinstall the bearing half and connecting rod cap,

and tighten the bolts to 20 N·m (2.0 kgf·m, 14 lbf·ft)

90 ° (K20Z2 engine) or 29 N·m (3.0 kgf·m,

22 lbf·ft)

90 ° (K20Z3 engine).

NOTE:

• Apply new engine oil to the bolt threads and

flanges.

• Do not rotate the crankshaft during inspection.

7. Remove the connecting rod cap and the bearing

half, and measure the widest part of the plastigage.

02

Connecting Rod Bearing Selection

Connecting Rod Big End Bore Code Locations

Normal Bore Size
K20Z2 engine: 48.0 mm (1.89 in.)
K20Z3 engine: 51.0 mm (2.01 in.)

7-9

8. If the plastigage measures too wide or too narrow,

remove the upper half of the bearing, install a new,
complete bearing with the appropriate color
code(s), and recheck the clearance. Do not file,
shim, or scrape the bearings or the caps to adjust
clearance.

9. If the plastigage shows the clearance is still

incorrect, try the next larger or smaller bearing (the
color listed above or below the current one), and
check clearance again. If the proper clearance
cannot be obtained by using the appropriate larger
or smaller bearing, replace the crankshaft, and start
over.

1. Inspect each connecting rod for cracks and heat

damage.

2. Each rod has a tolerance range from 0 to 0.024 mm

(0.0009 in.), in 0.006 mm (0.0002 in.) increments,
depending on the size of its big end bore. It is then
stamped with a number or bar (1, 2, 3, or 4/l, ll, lll,
or llll) indicating the range. You may find any
combination of numbers and bars in any engine.
(Half the number or bar is stamped on the bearing
cap, the other half is on the rod.)
If you cannot read the code because of an
accumulation of oil and varnish, do not scrub it
with a wire brush or scraper. Clean it only with
solvent or detergent.

03

04

05

Connecting Rod Journal Code Location

7-10

Engine Block

No. 1 JOURNAL

No. 4 JOURNAL

Larger big end bore

Smaller bearing (Thicker)

1 or I

2 or II

3 or III

4 or IIII

Big end
bore
code

Smaller
rod
journal

Smaller
bearing
(Thicker)

Rod
journal
code

Green/
Brown

Black

Yellow/
Green

Brown

Pink/
Yellow

Green

Brown

Blue

Yellow

Pink

Green

Brown/
Black

Brown/
Black

Green/
Brown

Yellow/
Green

Black/
Blue

A

B

C

D

3. The connecting rod journal codes are stamped on

the crankshaft in either location.

4. Use the big end bore codes and rod journal codes

to select the appropriate replacement bearings
from the following table.

NOTE:

• Color code is on the edge of the bearing.
• When using bearing halves of different colors, it

does not matter which color is used in the top or
bottom.

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