Suzuki LT-4WD 1990, Service Manual

Page: 417 / 508

1 5- 1 5
L T-F4WDXM ('91 -MODEL)
VALVE A N D S EAT C O N D I T I O N
VALVE S EAT W I D T H
Coat the v a l ve seat with p r u ss i a n b l u e u n iform l y .
Fit t h e v a l ve a n d t a p t h e co ated seat with t h e v a l ve face i n
a rotat i n g m a n n e r , i n o r d e r t o o bta i n a c l e a r i m press i o n of
the seat i n g contact. In this o p e ratio n , u s e t h e v a l ve l a p p e r
t o h o l d t h e v a l ve h e a d .
The r i n g - l i ke d y e i m p re s s i o n l eft o n t h e va l ve face m u st b e
conti n u o u s-without a n y b rea k . I n a d d itio n , t h e width of t h e
d y e ring , which is the v i s u a l ized seat "width " , m u st be with i n
t h e specificatio n .
Valve seat width
Standard @J : 0 . 9 - 1 . 1 m m ( 0 . 0 3 5 - 0 . 043 i n )
I f either req u i re m e n t i s n ot met, co rrect t h e seat by serv i c i n g
it a s fo l l o w s .
VALVE S EAT S E RV I C I N G
The valve seats for both i ntake a n d e x h a u st valves a re a n g led
to p resent two beve l s , 1 5 ° and 4 5 ° .
I ntake s i d e E x h a ust s i d e
4 5 ° N - 6 0 8 N - 1 1 6
1 5 °
N - 2 2 9 N - 1 1 6
For U . S . A . model
N - 1 40- 5 . 5 S o l i d p i l ot ( I N . )
N - 1 00- 1 0 S o l i d p i l ot ( EX . )
For other models
0 9 9 1 6-2 1 1 1 0 : Valve seat cutter set
0 9 9 1 6-24900 : Valve seat cutter set
0 9 9 1 6-24420 : Cutter ( N - 1 1 6 )
0 9 9 1 6 - 2 7 7 2 0 : C utter ( N - 2 2 9 )
0 9 9 1 6-249 3 5 : Cutter ( N - 6 0 8 )
0 9 9 1 6-2448 0 : Solid p i l o t ( N - 1 40 - 5 . 5 )
0 9 9 1 6-24450 : Solid pilot ( N - 1 00 - 1 0 )
NO TE:
The valve seat contact area must be inspected after each cut.
1 . I nsert with a s l i g ht rotatio n , the solid p i l ot that g ives a snug
fit . The shoulder o n the p i lot s h o u l d be a bout 1 0 m m ( 0 . 3 9
i n ) from t h e v a l v e g u i d e .
2 . U s i n g t h e 4 5 ° cutte r, d e s c a l e a n d c l e a n u p t h e seat with
one o r two t u rn s .
3 . 1 n spect t h e seat b y t h e p re v i o u s seat w i dth m e a s u re m e nt
p roced u re . I f t h e seat i s p itted o r b u rned , a d d itio n a l seat
c o n d it i o n i n g with the 4 5 ° c utte r is req u i red .
Valve seat