1997 HONDA CIVIC Head cover

Gylinder Head
lllustrated Index
CAUTION:
. To avoid damage, wait until the engine coolant temperatule drops below 100"F (38'C) before removing the cylinder
head.
. When handling a metal gasket, take care not to fold it or damage the contact surface'
NOTEr Use new O-rings and gaskets when reassembling'
CYLINDER HEAD
COVERRefer to page 6 46, when
installing cylinder head cover.
WASHERReplace when damaged
or deteriorated.
O.RINGReplace.
6x1.0mm9.8 N.m 11.0 kgf.m, 7.2 lbfft)Apply soapsuds to threads and cylinder head
contact surface when replacing the rubber
seal, then temove any soapsuds after install
ing rubber seal.
RUBBER SEALReplace when damagedor deteriorated.
CYLINDER HEAD BOI-T
10 x 1.25 mm67 N.m 16.8 kgf m, a9 lbt'ft)
Tightening, Page 6-46
Apply engine oilto the threads.HEAD COVEB GASKETReplace when leaking,
damaged or deteriorated.Apply liquid gasket at
the four corners ol therecesses,
DISTRIBUTORSee section 23.
8 x 1 .25 mm24 N.m (2.4 kgf.m,17 tbt.ft)
CYLINDER HEADGASKETReplace.
8 x 1.25 mm24 N.m {2.4 kgf m, 17 lbf ftl
t(cont'd)
6-23
PINS

13. Remove the upper radiator hose' heater hose and
water bYPass hose
WATEREYPASSHOSEUPPERRADIATORHOSE
14.
HEATERHOSE
Remove the engine wire harness connectors and
wire harness clamps from the cylinder head and the
intake manifold.
o Four fuel injector connectors
. Engine coolant temperature (ECT) sensor con-
nector
a
a
a
ECT switch connector
ECT gauge sending unit connector
Throttle position sensor connector
Manitold absolute pressure (MAP) sensor con-
nector
Primary heated oxygen sensor (primary HO2S)
connector
Secondary heated oxygen sensor (secondary
HO2S) connector (D16Y7 engine)
Exhaust gas recirculation (EGR) valve lift sensor
connector (D16Y5 engine)
. VTEC solenoid valve connector (Dl6Y5, D16Y8
engrnes)
. VTEC pressure switch connector (D16Y5. D16Y8
engrnes,
. ldle air control (lAC) valve connector
15.Remove the spark plug caps and distributor from
the cylinder head.
Remove the uPPer bracket.
NOTE:
. Use a jack to support the engine before the
upper bracket is removed.
. Make sure to place a cushion between the oil
pan and the jack.
12 x 1.25 mm
74 N.m {7.5 kgf m.
sil lbl.ftl
UPPERBRACKET
'17. Remove the cylinder head cover'
CYLINDERHEAD COVER
(cont'd)
6-29

Cylinder HeadRocker Arms
18.
19.
21.
22.
Removal (cont'd)
Remove the timing belt {see page 6-19).
Remove the camshaft pulley and back cover,
CAMSHAFTPULLEYClean when installing.
6x1.0mm8 x 1.25 mm37 N.m (3.8 kgf.m,21 tbtlrlApply engine oilto thebolt threads.
Remove the exhaust manifold {see pages 9-6 and 9_7).
Remove the intake manifold (see pages 9-2 thru 4).
Remove the cylinder head bolts, then remove thecylinder head.
CAUTION: To pr€vent warpage, unsclew lhe bohsin sequonce 1/3 turn at a time; rgpeat tho sequenceuntil all bolts are loosened.
CYLINDER HEAD BOLTS LOOSENING SEOUENGE:
6-30
Removal
1. Loosen the adjusting screws.
2. Unscrew the camshaft holder bolts, then,removethe rocker arm assembly.
NOTE:
a Unscrew the camshaft holder bolts two turns at at,me, in a crisscross pattern, to prevent damao_ing the valves or rocker arm assembly.. When removing the rocker arm assembly, do notremove the camshaft holder bolts. The bolts willkeep the camshaft holders, the springs and therocker arms on the shaft.
CAMSHAFT HOLDER BOLTS LOOSENINGSEOUENCE:
\(
ADJUSTING SCREWS

Cylinder Head
4. Apply liquid gasket (Part No. 08718 - 0001 or 08718 -
0003) to the head mating surfaces of the No. 1 and
No.5 camshaft holders.- Apply liquid gasket to the shaded areas
Set the rocker arm assemblY in place and loosely
installthe bolts.- Make sure that the rocker arms are properly posi-
tioned on the valve stems.
Tighten each bolt two turns at a time in the sequence
shown below to ensure that the rockers do not bind
on the valves.
Specitied torquo:
8 mm bolts: 20 N.m (2.0 kgt'm, l/t lbf'ft)
Apply engine oil to the threads.
6 mm bolts: 12 N.m {1.2 kgif'm, 8.7 lbf'ft)
Apply engine oil to the thresds.
6 mm bolts: O, @. @, @
7. Install the back cover. then install the camshaft pul-!
6-45
lnstallation
lnstallthe cylinder head in the reverse order of removal:
NOTE:
. Always use a new head gasket.
. Cylinder head and cylinder block surface must be
clean.
. "UP" mark on the camshaft pulley should be at the top
. Turn the crankshaft so the No. 1 piston is at TDC (see
page 6-20).
. Clean the oil control orifice before installing.
a Do not use the upper cover and lower cover to store
removeo rlems.
Clean the upper cover and lower cover before instal-
taUon.
Cylinder head dowel pins must be aligned.1.
CYUNOER HEAD
PINS
(cont'd)

Cylinder Head
Installation (cont'dl
Position the camshaft correctly (see page 6-20).
Tighten the cylinder head bolts sequentially in four
steps.
rsr st.p: O - @ 20 N.m (2.0 kgf.m, 14 lbf'ft|
2nd srep: O - @ 49 N.m (5.0 kgf.m, 36 tbtft)
3rd stop; O - @ 67 N.m {6.8 kgf.m, /r9 lbl'ft}
4th st6p: O, O 67 N.m 16.8 kgf.m, 49 tbf.ftl
NOTE:
. We recommend using a beam-type torque
wrench, When using a preset-type torque wrench.
be sure to tighten slowly and not to overtighten.
. If a bolt makesany noisewhileyou aretorquing it,
loosen the bolt, and retighten it from the 1st step,
CYLINDER HEAD BOLTS TOROUE SEOUENCE:
Install the intake manifold and tighten the nuts in a
crisscross pattern in two or three steps, beginning
with the inner nuts (see pages 9-2 thru 9-4).
. Always use a new intake manifold gasket.
Install the exhaust manifold and tighten the nuts in
a crisscross pattern in two or three steps, beginning
with the inner nut {see pages 9-6 and g-7).
. Always use a new exhaust manifold gasket.
Install the exhaust manifold bracket. lnstall the
exhaust pipe A and the bracket, then install the cover.
4.
6-46
\-
(
7.Installthe timing belt (see page 6-20).
Adjust the valve clearance (see page el2),
Install the head cover gasket in the groove of the
cylinder head cover, Seat the recesses for the
camshaft first, then work it into the groove around
the outside edges.
NOTE:
. Before installing the head cover gasket, thor-
oughly clean the seal and the groove.
. When installing, make sure the head cover gas-
ket is seated securely in the corners of the
recesses wath no gap.
COBNERS OFTHE RECESS
CORNERS OFTHE REcEss covEB
Apply liquid gasket to the head cover gasket at the
four corners of the recesses.
NOTE:
. Use liquid gasket, Pan No. 08718 - 0001 or 08718- 0003.
. Check that the mating surfaces are clean and dry
before applying liquid gasket.
. Do not install the parts if five minutes or more
have elapsed since applying liquid gasket.
Instead, reapply liquid gasket after removing old
residue.
. After assembly, wait at least 30 minutes before
filling the engine with oil.
8.
9.
I
10.

11. When installing the cylinder head cover, hold the
head cover gasket in the groove by placing your fin-
gers on the camshaft holder contacting surfaces
(top of the semicircles)
Set the spark plug seal on the spark plug tube.
Once the cylinder head cover is on the cylinder
head, slide the cover slightly back and forth to seat
the head cover gasket.
NOTE:
. Before installing the cylinder head cover, clean
the cylinder head contacting surfaces with a
shop towel.
. Do not touch the parts where liquid gasket was
aDolied.
. Take care not to damage the spark plug seals
when installing the cylinder head cover,
. Visually check the spark plug seals for damage.
. Replace any washer that is damaged or deterio-
rated.
6x1.0mm9.8 N.m 11.0 ksf.m,7.2lbf ftl
\g-----*o""t'Ptl
veEE
\_
6-47
12. Tighten the nuts in two or thre€ steps. In the final
step, tighten all bolts, in sequence, to 9 8 N'm (1.0
kgf.m, 7.2 lbf.ft).
NOTE: After assemblv, wait at least 30 minutes
before filling the engine with oil
After installation, check that all tubes, hosss and
connectors are installed correctlY
1?

VTEC Solenoid ValveVTEC Rocker Arms
a
I
(
Inspection
1. Remove the VTEC solenoid valve assembly fromthe cylinder head. and check the VTEC solenoidvalve filter for clogging.
. lf there is clogging, replace the engine oilfilter andengine oil.
6x1.0mm12 N.m (1.2 kgf.m, B,7 tbf.ftl
lf the filter is not clogged. push the VTEC solenoidvalve with your finger and check its movemenr.
. lf the VTEC solenoid valve is normal, check theengine oil pressure.
6x1.0mm12 N.m (1.2 kgtm,8.7 lbt.ft)
6-54
L-
SOLENOID
Manual Inspection
1. Set the No. 1 piston at TDC.
2. Remove the ignition wire cover and the wires.
3. Remove the ignition clamps while pulling up on theIock.
6xl.0mm9.8 N.m (1.0 kgl.m, 7.2 tbtftl
IGNITIONWIRE COVER
IGNITIONWIRE
\
LOCK

Remove the cylinder head cover.
NOTE: Refer to page 6-88 when installing the cylin-
der head cover.
Push the mid rocker arm on the No. 1 cylinder man-
ually.
Check that the mid rocker arm moves independently
of the primary and secondary rocker arms.
Check the mid rocker arm ot each cylinder at TDC'
. lf the mid rocker arm does not move, removs the
mid, primary and secondary rocker arms as an
assembly and check that the pistons in the mid
and primary rocker arms move smoothly.
. lf any rocker arm needs replacing, replace the
primary. mid, and secondary rocker arms as an
assembly.
7.
2. Plug the
per).
Inspection Using SPecial Tools
CAUTION:
. B€fore using tho Yalvo inspeciion tool, mako suro
that ths air pre3sure gauge on the air comprossor
indicatos ovor /rco kPa (,1 kgf/cm', 57 psi)
. In3poct ths valve closranca bafore rock$ arm impoc'
tion.
. Cover the timing beh whh I shop towel to prcvenl
gstting oil on the bolt'
. Chock ths mid rocker arm of each cylindll at TDC'
1. Remove the cYlinder head cover.
NOTE: Rsfer to page 6-86 when installing the cylin-
der head cover.
relief hole with the special tool (Air Stop-
OTLA' - PRSO2OA
3. Remove the bolt and washer from the inspection
hole and connoct the an air pressure regulator with
a 0 - 100 psi gauge.
AIF STOPPEBTNSPECTION HOIEOTLA' - PR3O2OA
t0 x 1.0 mrn20 N.m {2.0 kgf m,14 tbt'fr)
AIR PRESSUREREGULATOR{Cornm.rcirlly avril.bl.lBEGULATOR VALVE. Pull the lever andturn to adjust.{cont'd}
6-55