Honda Civic Service Manual page 152

Cylinder Head
Valve Seats
Warpage
N O T E : l f t h e c a m s h a f t - t o - h o l d e r o i l c l e a r a n c e s ( s e e
page 6-36) are not within specification, the cylinder head
cannot be resurfaced.
lf the camshaft-to-holder oil clearances are within sDeci,
fications, check the cylinder head lor warpage.
lf warpage is less than 0.05 mm (0.002 in), cylin-
der head resurfacing is not required.
lf warpage is between 0.05 mm (0.002 in) and
0.2 mm {0.008 in), resurface the cylinder head.
M a x i m u m r e s u r f a c e l i m i t i s 0 , 2 m m ( 0 . 0 0 8 i n )
based on a height of 93 mm (3.66 in).
Measure along edges, and three ways across center.
Cylinder Head Height:
Standard {Newl: 92.95 - 93.05 mm
{3.659 - 3.66:} in)
6-40
\
Reconditioning
'1. Renew
the valve seats in the cylinder head using a
valve seat cutter.
N O T E : l f t h e g u i d e s a r e w o r n ( s e e p a g e 6 - 3 9 ) .
r e p l a c e t h e m ( s e e p a g e 6 - 4 1 ) b e l o r e c u t t i n g t h e
valve seats.
VALVE SEAT
CUTTER
(Commercially available)
2 .
?
4.
C a r e f u l l y c u t a 4 5 ' s e a t , r e m o v i n g o n l y e n o u g h
material to ensure a smooth and concentric seat.
Bevel the upper edge of the seat with the 30. cutter
and the lower edge of the seat with the 60' cutter.
Check the width of the seat and adjust accordingly.
Make one more very light pass with the 45" cutter to
remove any possible burrs caused by the other cut-
Iers.
Valve Seat Width:
Standard (N€w):
Intake:
0.85 - 1.15 mm 10.033 - 0.045 in)
Exhaust:
1.25 - 1.55 mm {0.049 - 0.061 in}
Sorvice Limit:
Intake:
1.6 mm (0.063 inl
Exhausl:
2.0 mm (0.079 in)
S e a t W i d t h
5.
After resurfacing the seat, inspect for even valve
s e a t i n g r A p p l y P r u s s i a n B l u e c o m p o u n d t o t h e
valve face, and insert the valve in its original loca-
tion in the head, then liit and snap it closed against
the seat several times.