Valve Insoection; Valve Stem-To-Guide Clearance Insoection - Honda Civic Service Manual

Gylinder Head
Valve Inspection
1 .
R e m o v e t h e v a l v e s ( s e e p a g e 6 - 3 1 ) ,
Measure the valve in these areas.
lntake Valve Dimensions
A Standard lNewl: 34.85 35.15 mm
B Standard {Newl:
C Standard lNew):
C Service Limit:
B Standard (New):
C Standard (New):
C Service Limit:
Exhaust Valve Dimensions
A Standard (New): 29.85-30.15 mm
{ 1 . 3 7 2 1 . 3 8 4 i n . l
108.7 - 109.5 mm
14.280- 4.311 in.)
5.475 5.485 mm
1 0 . 2 1 5 6 - 0 . 2 1 5 9 i n . )
5.445 mm {0.214 in.l
( 1 . 1 7 5 - 1 . 1 8 7 i n . )
108.3 109.1 mm
(4.264- 4.295 in.l
5.450 5.460 mm
(0.2146 0.2150 in.)
5.42 mm (0.213 in.)
2 .
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6-32
t-
Valve Stem-to-Guide Clearance
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Inspection
1 . Remove the valves (see page 6-3'1).
S l i d e t h e v a l v e o u t o f i t s g u i d e a b o u t 1 0 m m . t h e n
measure the guide-to-stem clearance with a dial
indicator while rocking the stem in the direction of
normal thrust (wobble method).
. l f t h e m e a s u r e m e n t e x c e e d s t h e s e r v i c e l i m i t ,
recheck it using a new valve.
. lf the measurement is nowwithin the service
limit, reassemble using a new valve.
. l f t h e m e a s u r e m e n t w i t h a n e w v a l v e s t i l l
exceeds the service limit, go to step 3.
lntake Valve Stem-to-Guide Clearance:
Standard lNew): 0.06 0.11 mm
{0.002 0.004 in.}
Service Limil: 0.16 mm {0.006 in.)
Exhaust Valve Stem-to-Guide Clearance:
S t a n d a r d l N e w l : 0 . 1 1 - 0 . 1 6 m m
10.004 0.006 in.)
Service Limit:
0.22 mm 10.009 in.)
Subtract the O.D. of the valve stem. measured with
a micrometer, from the LD. of the valve guide,
m e a s u r e d w i t h a n i n s i d e m i c r o m e t e r o r b a l l g a u g e .
Take the measurements in three places along the
v a l v e s t e m a n d t h r e e p l a c e s i n s i d e t h e v a l v e g u i d e .
The difference between the largest guide
m e a s u r e m e n t a n d t h e s m a l l e s t s t e m m e a s u r e m e n t
should not exceed the service limit
lntake Valve Stem-to-Guide Clearance:
Standard (New): 0.030 0.055 mm
{0.0012 0.0022 in.)
Service Limit;
0.08 mm (0.003 in.l
Exhaust Valve Stem-to-Guide Clearance:
Standard {Newl: 0.055 0.080 mm
(0.0022-0.003r in.l
Service Limit:
0.11 mm (0.004 in.)
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3 .
4,.
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