Onan NHC Series Operator's/Service Manual And Parts Catalog page 215

ENGINE TROUBLESHOOTING
GASOLINE ENGINE
TROUBLESHOOTING
GUIDE
CAUSE
•111 I l l l M i l IIMI l i i l 11
S T A R T I N G SYSTEM
L o o s e or Corroded B a u e r y C o n n e c t i o n
L o w or D i s c h a r g e d B a t t e r y -
F a u l t y Starter
F a u l t y Start S o l e n o i d
I G N I T I O N S Y S T E M
• •
1 g m t i o n T i m i n g Wrong
Wrong Spark P l u g Gap
F U E L S Y S T E M :
" T i l 1
O u t of F u e l - C h e c k
• n n n
• • m m
E n g i n e F l o o d e d
• •
n •
• • •
•
D i r t y F u e l F i l t e r
•
•
D e f e c t i v e Fuel Pump
• . * _ . : i . . . .
Wrong V a l v e C l e a r a n c e
Broken V a l v e Soring
V a l v e or V a l v e Seal L e a k i n g
P i s t o n Rings Worn or B r o k e n
Wrong Bearing C l e a r a n c e
C O O L I N G SYSTEM ( A I R C O O L E D )
P o o r A i r C i r c u l a t i o n
D . - t / or O i l y C j Q l m g F i n s
B l o w n Head G a s k e t
C O O L I N G SYSTEM ( W A T E R C O O L E D )
In s u f f i c i e n t C o o l ant
F a u l t y T h e r m o s t a t
W o r n W a t e r P u m o o r P u m p S e a l
Water P a s s a g e s R e s t r i c t e d
D e f e c t i v e Gasket
Blow.i Heap G a s k e t
L U B R I C A T I O N S Y S T E M -
D e f e c t i v e O i l Gauge
R e l i e f V a l v e Stuck
F a u l t y Qi I Pump
D i r t y Q i or F i l t e r
or D i l u t e d
O i l T o o L i ght
O i l L e v e l L o w
O i l T o o H e a v y
D i r t y C r a n k c a s e Breather V a l v e
T H R O T T L E A N O G O V E R N O R
L i n k a g e O u t of A d j u s t m e n t
L i n k a g e Worn or D i s c o n n e c t e d
Governor S p r i n g S e n s i t i v i t y T o o G r e a t
i n k a g e B i n d i n g
S02492