Suzuki LT-4WD 1990 Service Manual page 418

C A U T I O N :
Cut t h e minimum a m o u n t necessary from t h e seat to prevent
the p o s s i b ility o f the valve stem becom i n g too close to t h e
rocker a rm f o r correct v a l v e contact a n g l e .
I f t h e c o ntact a re a i s t o o l o w o r t o o n a rrow , u s e t h e 4 5 ° cutte r
to r a i s e a n d w i d e n t h e c o n t a ct a re a . I f t h e c o n t a ct a re a i s too
h i g h or too wi d e , u s e t h e 1 5 ° c utte r to lower and n a r r o w the
c o n t a c t a rea .
4 . Aft e r t h e d e s i re d s e a t p o s i t i o n a n d w i d t h i s a c h i ev e d , u s e
t h e 4 5 ° c u t t e r v e ry l i g ht l y to c l e a n u p a n y b u rrs c a u s e d
by t h e previ o u s c u tt i n g o p e rati o n s . D O N O T u s e l a p p i n g
c o m p o u n d aft e r t h e f i n a l c u t i s m a d e . T h e f i n i s h e d v a l v e
s e a t s h o u l d h a v e a v e l vety s m o ot h f i n i s h a n d n o t a h i g h l y
p o l i s h ed o r s h i n y f i n i s h . T h i s w i l l p r
t h e f i n a l s e at i n g of t h e v a l ve w h i c h w i l l o cc u r d u r i n g t h e
f i rst f e w s e c o n d s of e n g i n e o p e rati o n .
5 . C l e a n and a s s e m b l e t h e h e a d a n d v a l v e c o m p o n e n ts . F i l l
t h e i nt ake a n d e x h a u st p o rts w i t h g a s o l i n e to c h e c k f o r
l e a k s . I f a n y l e a ks o c c u r , i n s p e ct t h e v a l v e s e a t a n d f a c e
f o r b u rrs o r o t h e r t h i n g s t h at c o u l d p r e v e n t t h e v a l v e f r o m
s e a l i n g .
W A R N I N G :
Always use extreme caution w h e n h a n d l i n g g a so l i n e .
N O TE:
Be sure to adjus t th e valve clearance a fter reassemblin g the
engin e .
V A l V E ST E M E N D C O N D I T I O N
I n s pect t h e v a l v e ste m e n d face f o r p itti n g a n d w e a r . I f p i tt i n g
o r w e a r of t h e ste m e n d f a c e a r e p re s e n t , t h e v a l v e s t e m e n d
m a y b e res u rfa c e d , p ro v i d i n g t h at t h e l e n g t h
r e d u c e d t o l e s s t h a n 2 . 5 m m ( 0 . 1 0 i n ) . I f t h i s l e n g t h b e c o m e s
l e s s t h a n 2 . 5 m m ( 0 . 1 0 i n ) , t h e v a l v e m u st b e re p l a c e d . Afte r
i n sta l l i n g a v a l v e w h o s e s t e m e n d h a s b e e n g r o u n d off a s
a bo v e , c h e c k to e n s u re t h at t h e f a c e
e n d i s a bove t h e cotte rs
V A l V E S P R I N G S
C h e c k t h e spri n g s f o r stre n g t h b y m e a s u r i n g t h e i r free l e n g t h s
a n d a l s o t h e f o r c e r e q u i re d to c o m p re s s t h e m . I f t h e l i m it
i n d i c at e d be l o w i s e x c e e d e d by t h e f r e e l e n g t h r e a d i n g o r i f
t h e m e a s u red f o r c e d o e s n o t f a l l w i t h i n t h e ra n g e s p e c i fi e d ,
re p l a c e with a S U Z U K i s p r i n g a s a s e t .
Valve s pring free l e n g t h U N . & EX . )
S e rvice limit I N N E R : 3 5 . 1 m m ( 1 . 38 i n )
O U T E R : 3 9 . 9 m m ( 1 . 5 7 i n )
o
v i d e a soft s u rf a c e f o r
CD
@
of t h e v a l ve ste m
@
Contact a rea too l ow
and too n a rrow on face
of valve
Con tact a rea too
a n d too wide on face of
valve
w i l l n o t b e
LT-F4WDXM ('91 -MODE L)
h i gh
1 5- 1 6