Suzuki LT-4WD 1990 Service Manual page 72

CA U T I O N :
Cut the m i n i m u m a m o u nt necessa ry from the
seat to prevent the possi b i l ity of the valve
stem becom i n g too c lose to the rocker arm
for correct va l ve contact angle.
If the contact a rea is too l ow or too narrow, use
the 45° c utte r to ra ise and widen the contact a rea .
I f the contact a rea is too h i gh o r too wide, use the
1 5° cutte r to l owe r and na rrow the contact a rea.
4. Afte r the desi red seat position a n d width is
ach i eved, use the 45° cutte r ve ry l i ghtly to
c l ea n u p a n y b u rrs caused by the previ ous
cutt i n g operati ons. D O N OT use l a p p i n g com­
pou n d after the f i n a l cut is made. The f i n ished
va l ve seat shou l d h ave a ve l vety smooth fi n ish
and n ot a h i g h l y pol ished or sh i ny f i n i s h . This
wi l l p rovide a soft su rface for the f i n a l seati n g
o f the va lve wh ich wi l l occu r d u ri n g t h e fi rst
few seconds of engi ne operation .
5. Clean and asse m b l e the head and va lve com po­
nents. F i l l the i nta ke and exhaust po rts with
gaso l i ne to check for l ea ks. If any l ea ks occu r,
i nspect the va l ve seat and face for b u rrs o r
othe r thi ngs t h a t cou l d prevent the va l ve from
sea l i n g .
WA R N I N G :
A lways use extreme caut i o n when h a nd l i n g
gaso l i ne.
N OT E :
Be s u re to adj u st the val ve c l ea ra nce after
reassem b l ing the engi ne.
VALVE STEM END CONDITION
I nspect the va l ve stem end face for pitt i n g and
wea r. If pitt i n g or wea r of the stem end fa ce a re
present, the va lve ste m end may be resu rfaced,
provid i n g that the l e n gth CD wi l l n ot be red u ced to
less tha n 2.7 m m (0. 1 1 i n ) . If t h i s l e ngth becomes
l ess than 2 .7 mm (0. 1 1 i n ) , the va l ve m ust be
re p l aced . After i nsta l l i ng a va l ve wh ose ste m end
has been gro u n d off as above, check to ensu re
that the face ® of the va l ve ste m e n d is above
@ .
the cotte rs
C o n tact a r e a too h i g h
a n d t o o w i d e o n face o f
va l ve
C o ntact a r e a t o o l ow
a n d t o o n a r row o n face
of v a l v e
E N G I N E 3-36