Honda Civic. Manual — part 1030

Exhaust

5.450-5.460
mm (0.2146-
0.2150 in.)

5.420 mm
(0.213 in.)

Stem-to-guide
clearance

Intake

0.030-0.055
mm (0.0012-
0.0022 in.)

0.08 mm
(0.003 in.)

Exhaust

0.055-0.080
mm (0.0022-
0.0031 in.)

0.11 mm
(0.004 in.)

Valve seat

Width

Intake

1.25-1.55 mm
(0.049-0.061
in.)

2.00 mm
(0.079 in.)

Exhaust

1.25-1.55 mm
(0.049-0.061
in.)

2.00 mm
(0.079 in.)

Stem installed
height

Intake

44.0-44.5 mm
(1.73-1.75 in.)

44.7 mm
(1.76 in.)

Exhaust

44.1-44.6 mm
(1.74-1.76 in.)

44.8 mm
(1.76 in.)

Valve spring Free length

Intake

NIPPON
HATSUJO:
47.57 mm
(1.8728 in.)

-

CHUO
HATSUJO:
47.58 mm
(1.8732 in.)

Exhaust

NIPPON
HATSUJO:
49.64 mm
(1.954 in.)

-

CHUO
HATSUJO:
49.63 mm

2008 Honda Civic EX

2006-08 GENERAL INFORMATION Specifications - Civic (All Except GX & Hybrid)

ENGINE BLOCK (R18A1 ENGINE)

STANDARDS AND SERVICE LIMITS - ENGINE BLOCK (R18A1
ENGINE)

(1.954 in.)

Valve guide

I.D.

Intake

5.515-5.530
mm (0.2171-
0.2177 in.)

5.55 mm
(0.219 in.)

Exhaust

5.515-5.530
mm (0.2171-
0.2177 in.)

5.55 mm
(0.219 in.)

Installed height

Intake

15.2-16.2 mm
(0.598-0.638
in.)

-

Exhaust

15.5-16.5 mm
(0.610-0.650
in.)

-

Rocker arm

Arm-to-shaft
clearance

0.025-0.052
mm (0.0010-
0.0020 in.)

0.08 mm
(0.003 in.)

Item

Measurement

Qualification

Standard or

New

Service

Limit

Block

Warpage of deck

0.07 mm
(0.003 in.)
max.

0.10 mm
(0.004 in.)

Bore diameter

81.000-81.015
mm (3.1890-
3.1896 in.)

81.070 mm
(3.1917 in.)

Bore taper

-

0.05 mm
(0.002 in.)

Reboring limit

-

0.25 mm
(0.01 in.)

Piston

Skirt O.D. at 14
mm (0.55 in.)

80.980-80.990
mm (3.1881-

80.98 mm
(3.186 in.)

2008 Honda Civic EX

2006-08 GENERAL INFORMATION Specifications - Civic (All Except GX & Hybrid)

from bottom of
skirt

3.1886 in.)

Clearance in
cylinder

0.010-0.035
mm (0.0004-
0.0014 in.)

0.05 mm
(0.002 in.)

Ring groove
width

Top

1.23-1.24 mm
(0.048-0.049
in.)

1.26 mm
(0.050 in.)

Second

1.22-1.23 mm
(0.047-0.048
in.)

1.25 mm
(0.049 in.)

Oil

2.005-2.020
mm (0.0789-
0.0795 in.)

2.05 mm
(0.081 in.)

Piston ring

Ring-to-groove
clearance

Top

0.045-0.070
mm (0.0018-
0.0028 in.)

0.13 mm
(0.005 in.)

Second

0.035-0.060
mm (0.0014-
0.0024 in.)

0.13 mm
(0.005 in.)

Ring end gap

Top

0.20-0.35 mm
(0.008-0.014
in.)

0.60 mm
(0.024 in.)

Second

0.40-0.55 mm
(0.016-0.022
in.)

0.70 mm
(0.028 in.)

Oil

0.20-0.70 mm
(0.008-0.028
in.)

0.80 mm
(0.031 in.)

Piston pin

O.D.

19.960-19.964
mm (0.7858-
0.7860 in.)

19.960 mm
(0.7858 in.)

Pin-to-piston
clearance

-0.004 to
+0.003 mm

0.006 mm
(0.0002 in.)

2008 Honda Civic EX

2006-08 GENERAL INFORMATION Specifications - Civic (All Except GX & Hybrid)

(-0.00016 to
+0.00012 in.)

Connecting rod Pin-to-rod

clearance

0.005-0.015
mm (0.0002-
0.0006 in.)

0.02 mm
(0.0008 in.)

Small-end bore
diameter

19.969-19.975
mm (0.7862-
0.7864 in.)

-

Large-end bore
diameter

48.0 mm
(1.89 in.)

-

End play
installed on
crankshaft

0.15-0.35 mm
(0.006-0.014
in.)

0.45 mm
(0.018 in.)

Crankshaft

Main journal
diameter

54.976-55.000
mm (2.1644-
2.1654 in.)

-

Rod journal
diameter

44.976-45.000
mm (1.7707-
1.7716 in.)

-

Rod/main
journal taper

0.005 mm
(0.0002 in.)
max.

0.010 mm
(0.0004 in.)

Rod/main
journal out-of-
round

0.005 mm
(0.0002 in.)
max.

0.010 mm
(0.0004 in.)

End play

0.10-0.35 mm
(0.004-0.014
in.)

0.45 mm
(0.018 in.)

Runout

0.03 mm
(0.0012 in.)
max.

0.04 mm
(0.0016 in.)

Crankshaft
bearing

Main bearing-to-
journal oil
clearance

0.018-0.034
mm (0.0007-
0.0013 in.)

0.045 mm
(0.0018 in.)

2008 Honda Civic EX

2006-08 GENERAL INFORMATION Specifications - Civic (All Except GX & Hybrid)