S e a t i n g s u r f a c e s should b e h e l d a s c l o s e a s p o s s i b l e t o
width. S e a t s w o r n t o m o r e t h a n
width m u s t be r e c o n d i t i o n e d with 4 5 " a n d 15" c u t t e r s t o o b t a i n p r o p e r width.
Reground o r new
v a l v e s m u s t b e l a p p e d in t o p r o v i d e p r o p e r fit.
U s e
a hand v a l v e g r i n d e r with s u c t i o n cup f o r f i n a l lapping.
Lightly c o a t valve f a c e with " f i n e "
g r a d e of g r i n d i n g c o m p o u n d then r o t a t e valve on s e a t with g r i n d e r . Continue g r i n d i n g until s m o o t h
s u r f a c e is obtained o n s e a t and on valve f a c e .
Valve C l e a r a n c e : Valve c l e a r a n c e m u s t be c h e c k e d a f t e r r e s u r f a c i n g and lapping in. I n s t a l l v a l v e s
in
r o t a t e c a m s h a f t t o p o s i t i o n w h e r e c a m b a s n o e f f e c t o n t a p p e t ( T D C on c o m p r e s s i o n s t r o k e )
- - hold valve f i r m l y on s e a t and c h e c k c l e a r a n c e b e t w e e n v a l v e s t e m a n d t a p p e t (See C l e a r a n c e S e c t i o n ) .
If c l e a r a n c e i s i n s u f f i c i e n t , a d j u s t m e n t will b e n e c e s s a r y . L o o s e n the a d j u s t i n g s c r e w , t u r n i n o r out
u n t i l p r o p e r c l e a r a n c e i s a t t a i n e d . S e e E n g i n e - G e n e r a l S e r v i c e S e c t i o n f o r valve c l e a r a n c e and a d j u s t -
m e n t p r o c e d u r e .
CYLINDER HEADS
Blocked cooling f i n s o f t e n c a u s e l o c a l i z e d
s p o t s
u
which c a n r e s u l t in "blown" c y l i n d e r h e a d
g a s k e t s . If g a s k e t f a i l s i n a r e a s u r r o u n d i n g one of the r e t a i n i n g c a p s c r e w s , high t e m p e r a t u r e c o m b u s -
tion g a s e s c a n b u r n a w a y p o r t i o n s of a l u m i n u m a l l o y head. If n o e v i d e n c e of t h i s i s found, head should
b e c h e c k e d f o r f l a t n e s s . A s l i g h t l y w a r p e d h e a d c a n b e r e s u r f a c e d by s i m p l y rubbing i t on a p i e c e of
s a n d p a p e r p o s i t i o n e d o n a f l a t s u r f a c e . C a r e f u l l y c l e a n c a r b o n d e p o s i t s f r o m c y l i n d e r h e a d if i t i s t o
b e r e u s e d - - u s e p i e c e of wood o r s i m i l a r s o f t m a t e r i a l t o s c r a p e d e p o s i t s . Be c a r e f u l not t o n i c k o r
s c r a t c h a l u m i n u m , e s p e c i a l l y in g a s k e t s e a t a r e a .
GEAR (ELECTRIC START ONLY)
Do not replace ring gears i n t h e f i e l d . Kohler will no longer provide r i n g gears as a serviceable
part.
If
a ring gear i s damaged, t h e e n t i r e flywheel will have t o be replaced.
Refer t o page 11.5,
Step
10
f o r flywheel replacement procedure.
