Cam HONDA CIVIC 1996 6.G Owner's Guide

7.
8.
Remove the crankshaft pulley (see page 6-59).
Remove the cylinder head cover'
NOTE: Refer to page 6-86 when installing the cylin-
der head cover.
Remove the middle cover and lower cover.
NOTE: Do not use the middle and lower covers for
storing removed items.
MIDDLE COVER
LOWER COVER
9.
10.Loosen the adjusting bolt 180'.
to remove tension from the
retighten the adjusting bolt.
9.8 N.m lt.o kgf m,
7.2lw'ftl
Push the tensioner
timing belt, then
N.m (5.5 kgt'm,
1 1. Remove the timing belt.
TDC
lnstallation
Install the timing belt in the reverse order of removal;
Only key points are described here.
1. Set the timing belt drive pulley so that the No. 1 pis'
ton is at top dead center (TDC). Align the groove on
the timing belt drive pulley to the V pointer on the
oil pumP.
set the camshaft pulleys so that the No. 1 piston is at
TDC.
Align the TDC marks on the intake and exhaust cam-
shaft pulleys.
MARK
(cont'd)
6-63
POINTER

Timing Belt
lnstallation (cont'dl
3. Install the timing belt tightly in the sequence shown.
@ Timing belt drive pulley (crankshaft) + @Adjusting pulley * @ Water pump pu ey + @ Intakecamshaft pulley + @ Exhaust camshaft pulley,
NOTE: Make sure the timing belt drive pulley andcamshaft pullevs are at TDC,
Loosen and retighten the adjusting bolt to tensionthe timing belt.
Install the lower cover and middle cover.
NOTE: Clean the middle and lower covers beforeinstalling.
Install the crankshaft pulley, then tighten the pulleybolt (see page 459).
Rotate the crankshaft pulley about five or six turnscounterclockwise so that the timing belt positions onthe pulleys.
Adjust the timing belt tension (see page A611.
7.
6-64
a
9. Check that the crankshaft pulley and camshaft pul-leys are both at TDC.
CRANKSHAFT PULLEY
CAMSHAFT PULLEY:
lf the camshaft and crankshaft pulleys are not posi-tioned at TDC, remove the timing belt, adjust theposition following the procedure on page &63, thenreinstall the timing belt.
After installation, adjust the tension of each belt.
. See section 23 for alternator belt tension adjust-ment.
. See section 22lor NC compressor belt tensionadiustment,
. See section 17 for P/S pump belt tension adjust-ment.
'l
10.
11.
I
"UP" MARKS

Cylinder Head
lllustrated Index
CAUTION:
. To avoid damaging the cylinder head, wait until the engine coolant tempsraturo drops below 100"F (38"C1 bofote
removing it,
. when handling a metal gasket, take caro not to fold the gaskot or damage the contact surface of the gasket.
NOTE: Use new O-rings and gaskets when reassembling.
CYLINDER HEAO
PLUGReplace.
)@
DISTRIBUTOR
8 x 1 ,25 mm
27 N.m P.E kgl m.
20 tbf.foApply engine oil to
the threads.
cr.rMp.S
CAMSHAFT A"o''*t*'; wes@
OIL SEALReplace.
6 x l,omm9.8 N'm tl.0 kgt'm,7.2lbf ft)
RUBBER SEALReplace when damaged
or detedorated.
6x1.0mm9.8 N.m (1.0 kgf'm,
7.2 rbnftl
fi%
IGNMONWIRE COVER
CYLINOER HEAD
COVERRefer to page 6-86
when installing
HEAD COVER GASKETReplace when leaking, damaged
or deteriorated.Apply liquid gasket at thecorners of the recesses, Page 6-86
8 x 1,25 mm24 N.m {2.4 kgf'm,
1? tbf.ftl
EXHAUST
10 x 1.25 mm56 N.m (5.7 kgf m,,r1 lbl.ft)
(cont'd)
6-65

Cylinder Head
19.
20.
Removal (cont'dl
Remove the timing belt {see page 6-62).
Remove the back cover and camshaft pulleys.
BACK COVER
56 N.m (5.7 kgf m,
41 tbt.f06xl.0mm9.8 N,m (1.0 kgf.m, 7.2 lbf.ft)
21, Remove the exhaust manifold (see page 9-8).
22. Remove the intake manifold (see page g-5).
23. Loosen the adjusting screws.
INTAKE
No.4 No.3 No.2 No. 1
6-70
24. Remove the camshaft holder plates, camshaft hold-ers and camshafts.
CAMSHAFTHOLDER PLATE
Remove the cylinder head bolts, then remove the
cylinder head.
CAUTION: To prevsnt warpage. unscrew the bolts
in sequonc€ 1/3 turn at a tim€; lepeat lh6 sequence
until all bolts aro loosened.
CYLINDER HEAD BOLTS LOOSENING SEOUENCE:
CYLINDER HEADPLUGReplace. t
\1
\€\i
b4CAMSIIAFTS -

Camshafts
Inspection
NOTE:
. Do not rotate the camshaft during inspection.
. Removg the rocker arms and rocker shafts.
'L Put the camshafts and camshaft holders on the cylin-
der head. and then tighten the bolts to the specified
torque.
Specified Torque:
O -@: 8 mm botts 27 N.m {2.8 kgf.m,20 lbt'ft)
Apply engine oil to the threads,
O - @: 6 mm bolts 9.8 N.m (1.0 kgf m, 7.2 lbf'ft)
Seat the camshaft by pushing it toward the distribu-
tor end of the cylinder head.
Zero the dial indicator against the end of the distrib-
utor drive. then push the camshaft back and fonh
and read the end play.
Camshaft End Play:
Standard {New}: 0.05 - 0.15 mm
{0.002 - 0.006 inl
Service limil: 0.5 mm (0.02 in)
ooooooo
ooooo
\-
4.Remove the bolts. then remove the camshaft hold-
ers from the cylinder head.
- Lift the camshaft out of the cylinder head, wipe
clean, then inspect the lift ramps. Replace the
camshaft if lobes are pitted, scored, or excessively
- Clean the camshaft bearing surfaces in the cylin
der head, then set the camshaft back in place,
- Insert a plastigage strip across each iournal.
Put the camshaft on the cylinder head. then install
the camshaft holders, and then tighten the bolts to
the specified torque as shown in the left column on
this page.
Remove the camshaft holders, then measure the
widest portion of the plastigage on each journal.
Camshaft -to-Hold€1 Oil Clearsnce:
Standard {Newl: 0.050 - 0.089 mm
{0.002 - 0.004 inl
S6rvice Limit: 0.15 mm 10,006 inl
(cont'd)
6-75
PLASTIGAGE STRIP

Gamshafts
Inspection (cont'dl
7. lf the camshaft-to-holder oil clearance is out of tol-
erance:
- And the camshaft has already been replaced, you
must replace the cylinder head.- lf the camshaft has not been replaced, first check
the total runout with the camshaft supported on
V-blocks.
Camshaft Total Runout:
Standard (New): 0.03 mm {0.001 in} max.
Service Limit: 0.04 mm (0.002 inl
- lf the total runout of the camshaft is within toler,
ance, replace the cylinder head.- lf the total runout is out of tolerance. replace the
camshaft and recheck the camshaft to,holder oil
clearance. lf the oil clearance is still out of toler-
ance, replace the cylinder head.
INTAKEEXHAUST
PRIMARY33.088 mm
{1.3027 in)
32.785 mm
(1.2907 inl
MID36.267 mm(1.4278 in)
35.720 mm
{1.4063 in)
SECONDARY34.978 mm(1.3771 inl
3i1.691 mm(1.3658 in)
8. Check the cam lobe height.
Cam lobe height standard (New):
Cam Position
I
INTAKE
MID
EXHAUST
SEC MID PRI
TIB
T/B: TIMING BELTPRI: PRIMARYMID: MID
Check thrs area lor wear.

Cylinder HeadValve Guides
Warpage
NOTE: lf camshaft-to-holder oil clearances (see page 475)
are not within specification, the head cannot be resurfaced.
lf camshaft-to-holder oil clearances are within specifica-
tions, check the head for warPage.
. lf warpage is less than 0.05 mm (0.002 in) cylinder
head resurfacing is not required.
. lf warpage is between 0.05 mm (0.002 in) and 0 2 mm
(0.008 in), resurface cylinder head
. Maximum resurface limit is 0.2 mm (0.008 in) based
on a height of 142 mm (5.59 in).
PRECISION STRAIGHT EDGE
Measure along edges, and three ways across center'
Cylinder Head Height:
Standard lNewl: 1i11.95 - 142.05 mm
15.589 - 5.593 in)
Valve Movement
Measure the guide-to-stem clearance with a dial indica-
tor while rocking the stem in the direction of normal
thrust (wobble method).
lntake Valve Stem-to-Guide Cl6arance:
Standard (Newl: 0.05 - 0.11 mm
(0.0020 - 0.0043 inl
Service Limit: 0.15 mm {0.0059 inl
Exhaust Valve Stem-to-Guide Clealance:
Standard lNewl: 0.10 - 0.16 mm
(0.0039 - 0.0063 inl
Service Limit: 0.24 {0.0094 in)
Valve extended 10 mm out from seat.
lf the measurement exceeds the service limit, recheck
using a new valve.
lf the measurement is now within the service limit.
reassemble using the new valve
lf the measurement still exceeds the limit. recheck using
the alternate method below. then replace the valve and
guide, if necessary.
NOTE: An alternate method of checking guide to stem
clearance is to subtract the o.D. of the valve stem, mea-
sured with a micrometer, from the l.D. of the valve guide,
measured with an inside micrometer or ball gauge.
Take the measurements in three places along the valve
stem and three places inside the valve guide.
The difference between the largest guide measurement
and the smallest stem measurement should not exceed
the service limit.
lntake Valv€ Stem-to-Guide Clsarance:
Standard lNswl: 0.025 - 0.055 mm
10.0010 - 0.0022 inl
service Limit: 0.08 mm (0.003 in)
Exhaust Valve Stem-to Guide Cl€arance:
Standard {Newl: 0.050 - 0.080 mm
{0.0020 - 0.0031 inl
Service Limit 0.ll mm (0.004 in)
6-79

t
Valve Guides
Replacement
1. As illustrated below, use a commerciallv available
air-impact valve guide driver attachment modified
to fit the diameter of the valve guides. ln most
cases, the same procedure can be done using the
sDecial tool and a conventional hammer.
COMMERCIALLY AVAILABLEVALVE GUIDE DRIVER
87 mm -L- sz mm(3.43 inl I tz.zr int
rE-tt
10.8 mm10.42 inl
olVALVE GUIOE DRIVER,5.5 mm077,P - 0010100
Select the proper replacement guides and chill
them in the freezer section of a refrigerator for
about an hour.
Use a hot plate or oven to evenly heat the cylinder
head to 300"F (150"C). Monitor the temperature with
a cooking thermometer.
CAUTION:
. Do not use a torch; it may warp tho head.. Do not get tho head hotter than 300"F {150"C};excesgive heat may loosen thg valve seats.. To avoid burns. use haaw gloves whon handling
the heatod cylinder head.
6-80
Working from the camshaft side, use the driver and
an air hammer to drive the guide about 2 mm (0.1 in)
towards the combustion chamber. This will knock off
some ofthe carbon and make removaleasier.
CAUTION:
. Always wsar safety goggles or a face shield whsn
driving valve guides.
. Hold the air hammer dir€ctly in line with the
valve guide to prevont damaging thg dtiver.
Turn the head over and drive the guide out toward
the camshaft side of the head.
VALVE GUIOE DRIVER,5.5 mm077{2 - 0010100
lf a valve guide still won't move. drill it out with a8.0 mm (5/16 in) bit, then try again.
CAUTION: Drill guides only in extreme cases; you
could damago the cylinder head if ths guide br6aks.
Remove the new guide(s) from the freezer, one at a
time, as vou need them.
-:^-,65i^q
NNSp-<

7. Apply a thin coat of clean engine oil to the outside
of the new valve guide. Install the guide from the
camshaft side of the head; use the special tool to
drive the guide in to the specified installed height. lf
you have all l6 guides to do, you may have to reheat
the head,
VALVE GUIDE DRIVER,5.5 mm077i12 - (x)l01(x)
tr A\
Valve Guide Installed Hoight:
lntake: 12.55 - 13.05 mm {0.,194 - 0.514 in)
Exhaust: 12.55 - 13.05 mm 10.494 - 0.51'l in)
VALVE GUIDE
\
Reaming
NOTE: For new valve guides onlY.
1. Coat both reamer and valve guide with cufting oil.
2. Rotate the reamer clockwise the full length of the
valve guide bore.
Continue to rotate the reamer clockwise while
removing it from the bore
Thoroughly wash the guide in detergent and water
to remove any cutting residue.
Check clearance with a valve lsee page 6-73)
. Verify that the valve slides in the intake and
exhaust valve guides without exertlng pressure.
REAMER HANDLE
Turn r6amer in
clockwise direction
a
VALVE GUIOE REAMER. 5.5 mm
OTHAH - PJTO1IIB
6-81

5. lnstall the camshafts and camshaft oil seals.
NOTE:
. lnstallthe camshafts with the keyway facing up.
. lnstall the oil seal withthespring side facing in.
. The oil seal housing surface should be dry'
. Set the O-ring and dowel pin in the oil passage
of the No, 3 camshaft holder'
CAMSHAFTOIL SEALReplace.
Apply liquid gasket (P/N 08718 - 0001 or 08718 -
0OO3) to the head mating surfaces of the No. 1 and
No. 5 camshaft holders on both the intake and
exhaust side.
NOTE: Clean and dry the cylinder head mating sur-
faces before applying liquid gasket.
- Apply liquid gasket to the shaded areas'
7- lnstall the camshaft holders and camshaft holder
plaIe.
NOTE: The arrows marked on the camshaft holders
should point to the timing belt.
Tighten each bolt two turns at a time in the sequence
shown below.
NOTE: Wipe off the excess liquid gasket from the No.
1 and No. 5 camshaft holders with a shop towel
(D - @: 8 x 1.25 mm 27 N.|n (2.8 ksf'm, 20 lbf'ft)
Apply ongine oil to the throads.
O - O: 6 x 1.0 mm 9.8 N'm (1.0 kgfrm, 7.2 lbf'ft)
INTAKE
(D o o o oo o
EXHAUST
lnstall the back cover and camshaft pulleys.
{cont'd)
oooo0o@
CAMSHAFT
6-85