MG Midget J1 1933 Instruction Manual page 27

p i s t o n s a n d t h e face of t h e c y l i n d e r b l o c k a d j a c e n t t o t h e c y l i n d e r b o r e s .
W i t h a c l e a n r a g d a m p e d w i t h paraffin c l e a n off e v e r y t r a c e of f o r e i g n m a t t e r
r e m a i n i n g , h u t
do
rlot a t t e m p t t o p o l i s h t h i n g s u p w i t h e m e r y c l o t h o r o t h e r
a b r a s i v e , o r y o u will d o f a r m o r e h a r m t h a n g o o d . W h e n t h e s e t w o p i s t o n s
h a v e b e e n p r o p e r l y clc:~ned g i v e t h e s t a r t i n g h a n d l e half a t u r n a n d c l e a n
t h e o t h e r t w o i n t h e s a m e way.
A t t e n t i o n s h o u l d n o w h e g i v e n t o t h e c y l i n d e r h e a d . R e m o v e t h e
s p a r k i n g p l u g s w i t h t h e special S p a n n e r a n d t u r n t h e h e a d u p s i d e
d o w n , t h u s e x p o s i n g t h e c o m b u s t i o n c h a m b e r s , i n e a c h of w h i c h will b e
o b s e r v e d t h e c i r c u l a r h e a d s
o f
t w o valves-one i n l e t a n d o n e e x h a u s t ( s e e
I l l u s t r a t i o n
No. 17).
W i t h a h l u n t s c r e w d r i v e r carefully s c r a p e a w a y t h e c a r b o n
deposit
a d h e r i n g t o t h e s u r f a c e of t h e c o m b u s t i o n s p a c e s , t a k i n g p a r t i c u l a r c a r e t o
go
r o u n d e a c h v a l v e w i t h a s m a l l s c r e w d r i v e r i n o r d e r t o r e m o v e all t r a c e
of
c a r b o n . C l e a n t h e c o m b u s t i o n c h a m b e r s a n d v a l v e h,eads carefully w i t h r a g
m o i s t e n e d w i t h paraffin.
Removing the Valves.
H a v i n g t h o r o u g h l y c l e a n e d t h e c o m b u s t i o n
s p a c e s a n d v a l v e heads, p l a c e t h e c y l i n d e r h e a d o n t h e b e n c h t h e r i g h t w a y
u p .
To
o b t a i n access t o t h e v a l v e s p r i n g s , it is necessary t o r e m o v e t h e
c a m s h a f t . T h i s is easil! x h i e v e d
hy
u n s c r e w i n g t h e f o u r n u t s h o l d i n g t h e
c a m s h a f t b e a r i n g c a p s i n p o s i t i o n . T h e s e s h o u l d h e g i v e n half a t u r n i n
r o t a t i o n , i n a s i m i l a r m a n n e r t o t h e c y l i n d e r h e a d r e t a i n i n g n u t s , u n t i l t h e y
a r e 8 e v e n t u a l l y r e m o v e d . T h e c a m s h a f t c a n t h e n b e lifted f r o m its b e a r i n g s
PAGE TWENTY
.
J / A