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.