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Disttibutor
I
lgnition system with contact breaker assembly
B l 2
Check vacuum advance with a vacuum pump
C h e c k d i s l r i b u t o r n u m b e r a n d i i n d c o t r e c t i g n i t l o n a d -
v a n c e g r a p h o n p a g e s 7 a n d 8 .
S e l e c l a p r e s s u r e f r o m g r a p h a n d p u n r p ! p v a c ! u m
p u m p t o t h r s v a u e .
R e c o r d i g n i t i o n a d v a n c e .
S u b t r a c t b a s i c i g n i t i o n s e t t i n g f r o m r e c o r d e d i g n i t i o n
a d v a n c e a n d c h e c k t h a t v a u e c o n f o r m s t o g r a p h .
8 1 3
Example: Bosch number 0 231 170 287 on B23A
1981 82 Sweden
You decide to check vacuum advance at 200 mm Hg.
Recorded advance al this pressure is found 1o be
16-21".
Basic lgnition serting : 7'.
D fference - 9
14' which ls as specifiecl.
8 1 4
Check vacuum unit for leakage
Connect a vacuum pump. ncrease vacuum to 500 mm
Hg (67 kPa).
Record pressure for 1 minute. Pressure nrusl not drop
by more than 100 mm Hg {13.5 kP.).
8 1 5
P r e - i g n i t i o n
B 2 3 A S w e d e n 1 9 8 1 8 2
l f , d e s p i t e u s e o f 9 8 o c t a f e f u e , e n s i n e s p r o n e t o
p r e - l g n i t l o n ( k n o c k i n g ) , i g n i i i o n c a n b e r e t a r d e d t o 5 ' .
l g n i t i o n s e t t i n g c a n a l s o b e r e t a r d e d l o 2 ' b e f o r e T . D . C i f
v e h i c l e i s r e q u i r e d f o r t o w i n g p u r p o s e s . N o i e r h a t f u e
c o n s u m p t i o n w i l l i n c r e a s e a n d t h a t i g n i t o n s h o u d b e
r e s e t t o s p e c i f i c a l i o n c l u r i n g n o r m a l u s a g e .
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