CRANKCASE BREATHER SYSTEMS
The b r e a t h e r functions a s a one- way valve t o allow p r e s s u r e t o b e e x p e l l e d f r o m the c r a n k c a s e
a n d a l s o t o b l o c k o r p r e v e n t a i r f r o m being d r a w n h a c k into the c r a n k c a s e . A p r o p e r functioning
b r e a t h e r s y s t e m t h u s h e l p s m a i n t a i n a s l i g h t vacuum within the c r a n k c a s e .
K482 a n d K532 m o d e l s u s e a c l o s e d o r p o s i t i v e t y p e b r e a t h e r s y s t e m .
A
n o n s e r v i c e a b l e b r e a t h e r
v a l v e i s p r e s s e d i n t o t h e b r e a t h e r h o u s i n g which i s a s s e m b l e d t o t h e g o v e r n o r .
If t h e valve is faulty,
r e p l a c e b r e a t h e r - h o u s i n g a s a unit. A t u b e c o n n e c t s t h e b r e a t h e r t o a i r i n l e t s i d e of t h e c a r b u r e t o r .
T h e flow of a i r t o t h e c a r b u r e t o r t h u s c r e a t e s a v a c u u m o n t h e
which pulls a i r (and f u m e s ) f r o m t h e
c r a n k c a s e t o m a i n t a i n v a c u u m .
M o s t
e n g i n e s u s e the r e e d type b r e a t h e r a r r a n g e m e n t a s shown i n F i g u r e 8- 2. The b r e a t h e r
i s l o c a t e d a t the top of the g e a r h o u s i n g on t h e s e e n g i n e s .
The c o m p o n e n t s m u s t b e p r o p e r l y i n s t a l l e d
t o function p r o p e r l y . The
o n the r e e d s t o p m u s t b e a d j u s t e d s o t h a t they a r e
above the f l a t
s u r f a c e of the r e e d (when the engine i s not r u n n i n g ) . The r e e d a l l o w s a i r t o e x i t f r o m the c r a n k c a s e
b u t b l o c k s r e t u r n of a i r . The f i l t e r e l e m e n t should be s e r v i c e d o c c a s i o n a l l y s o t h a t c r a n k c a s e ventila-
tion i s not blocked. A c l o s e d s y s t e m i s a l s o e m p l o y e d on the
The c o m p o n e n t s of t h i s s y s t e m
a r e the s a m e a s the s t a n d a r d s y s t e m e x c e p t f o r a s p e c i a l housing. A tube c o n n e c t s the housing t o the
a i r i n l e t s i d e of the c a r b u r e t o r t o m a i n t a i n p o s i t i v e d r a w on b r e a t h e r whenever t h e engine i s in o p e r a t i o n .
ENGINE STORAGE INSTRUCTIONS
If engine i s t o b e out of s e r v i c e f o r a c o n s i d e r a b l e l e n g t h of t i m e , the following s t e p s a r e r e c o m -
m e n d e d :
D r a i n o i l f r o m c r a n k c a s e while engine is s t i l l hot a n d f l u s h with c l e a n , l i g h t
Refill
c r a n k c a s e .
2.
D r a i n f u e l t a n k a n d c a r b u r e t o r .
3.
R e m o v e , c l e a n a n d r e p l a c e s e d i m e n t bowl.
C l e a n e x t e r i o r of engine.
S p r e a d a l i g h t f i l m of oil o v e r a n y e x p o s e d s u r f a c e s of engine s u b j e c t t o c o r r o s i o n .
P o u r t a b l e s p o o n of oil i n t o s p a r k plug h o l e s , c r a n k engine slowly by hand a n d r e p l a c e
s p a r k p l u g s . S t o r e i n d r y p l a c e .
