Connecting Rods; Valves Valve Mechanism - Kohler K482 Service Manual

CONNECTING RODS

C h e c k b e a r i n g a r e a ( b i g e n d ) f o r e x c e s s i v e w e a r , s c o r e m a r k s , running and s i d e c l e a r a n c e .
R e p l a c e r o d h e a r i n g on K662 o r r o d on K482 a n d K532 if w o r n beyond l i m i t s s t a t e d .
Slightly u n d e r s i z e r o d b e a r i n g s
2.
Connecting r o d h e a r i n g s . 0 1 0 and . 0 2 0 M u n d e r s i z e a r e a v a i l a b l e f o r K662 f o r u s e with
r e g r o u n d c r a n k p i n .
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VALVES VALVE MECHANISM
C a r e f u l l y i n s p e c t valve m e c h a n i s m p a r t s .
e v i d e n c e of d e e p p i t t i n g , c r a c k s o r d i s t o r t i o n .
Guides: If a guide i s w o r n beyond l i m i t s , i t m u s t b e r e p l a c e d .
To r e m o v e , d r i v e g u i d e s i n t o valve c h a m b e r and c a r e f u l l y b r e a k p r o t r u d i n g end until guide i s
c o m p l e t e l y r e m o v e d .
d e p t h s t a t e d i n C l e a r a n c e Section.
Valves and Valve S e a t s : Consult p a r t s m a n u a l f o r c o r r e c t valve n u m b e r s when r e p l a c i n g valves.
S o m e a p p l i c a t i o n s r e q u i r e s p e c i a l h a r d f a c e d v a l v e s f o r both i n t a k e and e x h a u s t v a l v e s .
v a l v e s a r e a l w a y s h a r d faced.
m o d e l s a l t h o u g h i n t a k e i n s e r t s m a y b e u s e d in c e r t a i n a p p l i c a t i o n s .
i n s e r t s a r e u s e d on t h e K662.
If valve s e a t i n s e r t i s badly w o r n , w a r p e d , d a m a g e d o r if s e a t i n g s u r f a c e i s badly p i t t e d , the
i n s e r t m u s t h e r e p l a c e d .
s e a t r e m o v a l tool i s r e c o m m e n d e d f o r t h i s job.
i n s e r t b o r e a r e a i n the h e a d , u s e only K o h l e r s e r v i c e r e p l a c e m e n t i n s e r t s which h a v e k n u r l e d o u t e r
e d g e s t o p r o v i d e p r o p e r r e t e n t i o n in the h e a d .
p r e s s e d into b o r e t o p r e v e n t cocking of the i n s e r t .
F I G U R E 10-9
( . 002" l e s s than s t a n d a r d ) a r e a v a i l a b l e f o r K662 e n g i n e s when
Connecting r o d s . 0 1 0 " u n d e r s i z e a r e a v a i l a h l e f o r t h e K482 and
Be c a r e f u l not t o d a m a g e b l o c k when r e m o v i n g old guide.
R e a m t o p r o p e r I.
Intake v a l v e s e a t s a r e m a c h i n e d into b l o c k o n m o s t K482 and K532
E x h a u s t v a l v e s s e a t o n s p e c i a l h a r d e n e d i n s e r t s o n b o t h m o d e l s .
The i n s e r t s a r e a tight p r e s s fit in the c y l i n d e r h e a d .
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VALVE, VALVE PORT D I M E N S I O N S
C h e c k v a l v e s and valve s e a t a r e a o r i n s e r t s f o r
C h e c k c l e a r a n c e of valve s t e m s in guide.
A guide with , 0 1 0 " o v e r s i z e O.D. i s
R e p l a c e m e n t g u i d e s m u s t h e r e a m e d t o c o r r e c t s i z e .
D. a f t e r i n s t a l l a t i o n .
Since i n s e r t r e m o v a l c a u s e s l o s s of m e t a l in the
Make s u r e s e r v i c e i n s e r t s a r e p r o p e r l y s t a r t e d and
2 C Y L I N D E R MODELS
The guide b o r e m u s t b e
P r e s s new g u i d e s t o
E x h a u s t
Both i n t a k e a n d e x h a u s t s e a t
A c o m m e r c i a l valve