Acura 1994 Integra Service Manual page 85

Valves, Valve Springs and
Valve Seals
Valve lnstallation
W h e n i n s t a l i i n g v a l v e s i n t h e c y l i n d e r h e a d , c o a t
valve stems with oil before insening them into valve
guides, and make sure valves move up and down
smoothlv.
When valves and springs are in place, lightly tap the
end of each valve stem two or three times to snsure
proper seating of valves and valve keepsrs (use plas-
tic mallet).
NOTE: Tap the valve stem only along its axis so you
do not bend the stem.
PLASNC MALI.IT
?ur
Valve Guides
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 Stsm-to-Guide Clearance:
Strndlrd (Newl: 0.0i1- 0.10 mm
(0.002 - 0.004 in)
Ssrvicc Limit: 0.16 mm {0.006 in)
Exhsust Valye Stom-to-Guide Clearance:
Standard {N€w): 0.10 - 0.16 mm
{0.0O'l - 0.006 in)
Slrvica Limit: 0.22 mm {0.000 in)
Valve extended 10 mm out from seat
lf measurement exceeds the service limit, recheck
using a new valve.
l f m e a s u r e m e n t i s n o w w i t h i n t h e s e r v i c e l i m i t ,
reassemble using a n€w valve.
l f m e a s u r e m e n t s t i l l e x c e e d s l i m i t , r e c h e c k u s i n g
a l t e r n a t e m e t h o d b e l o w . t h e n r e p l a c e v a l v e a n d
guide, if necessary.
NOTE: An alternate method of checking guide to stem
clearance is to subtract the O.D. of the valve stem, mea-
s u r e d w i t h a m i c r o m e t e r . f r o m t h e l . D . o f t h e v a l v e
g u i d e , 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
gauge.
Take the measurements in three places along the valve
stem and three places inside the valve guide.
The diiference between the largest guide measurement
and the smallest stem measurement should not exceed
the service limit
lntake Valve Stom-to-Guide Clearance:
Standard (Newl: 0.02 - 0.05 mm
(0.001-0.002 in)
Service Limit
0.08 mm (0.003 in)
Exhaust Valve Stom.to.Guid€ Clearanco:
Standard (Newl: 0.05 - 0.08 mm
(0.002 - 0.003 inl
Srrvico Limit 0.ll mm 10.00't inl
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