C35 Introduction - Lotus TURBO ESPRIT Service Manual

Page 3
A
SECTION FB
The t r a n s m i s s i o n
is
a s i n g l e u n i t Comprising a manual 5-speed, a l l i n d i r e c t
g e a r b o x w i t h i n t e g r a l f i n a l d r i v e u n i t , , and t h e ' c l u t c h , b e l l h o u s i n g c o n t a i n i n g
t h e c l u t c h
release
mechanism.
The g e a r b o x h a s f i v e f o r w a r d g e a r s , a l l equipped w i t h syncromesh, and a
r e v e r s e g e a r o f t h e s p u r g e a r t y p e .
A c l u t c h s h a f t t r a n s m i t s t h e d r i v e from t h e c l u t c h t o t h e , g e a r b o x p r i m a r y
s h a f t , which i s s u p p o r t e d by a b a l l b e a r i n g
a t i t s
f r o n t and a d o u b l e b a l l
b e a r i n g
a t
t h e r e a r . The primary s h a f t c a r r i e s t h e 3 r d / 4 t h s y n c r o n i s e r a s s e m b l y ,
and o n
i t s
overhung r e a r e n d , t h e 5 t h g e a r s y n c r o n i s e r assembly. The l o w e r ,
s e c o n d a p y , s h a f t i n c o r p o r a t e s t h e f i n a l d r i v e p i n i o n g e a r on
i t s f r o n t e n d , i s
s u p p o r t e d by a r o l l e r b e a r i n g a t t h e f r o n t , and a d o u b l e b a l l b e a r i n g a t t h e
r e a r , and c a r r i e s t h e l s t / 2 n d s y n c r o n i s e r assembly. A r e v e r s e i d l e r g e a r on
a s e p e r a t e s p i n d l e may b e engaged w i t h s p u r g e a r s i n t e g r a l w i t h t h e p r i m a r y
s h a f t and w i t h t h e l s t / 2 n d s y n c r o n i s e r assembly.
The f i n a l d r i v e assembly
i s
c o n t a i n e d between . t h e a i u t c h h o u s i n g and g e a r b o x .
Two s h o r t o u t p u t s h a f t s s u p p o r t e d by t h e i r own h o u q i h g s , b o l t e d t o e a c h s i d e of
t h e t r a n s m i s s i o n , u s e a d o u b l e b a l l b e a r i n g on t h e i r b u t b o a r d e n d s , and a t a p e r
r o l l e r b e a r i n g a t t h e i n b o a r d e n d s , where t h e y c a r r y t h e crownwheel and
d i f f e r e n t i a l assembly.
F o u r s e l e c t o r s h a f t s a c r o s s t h e t d p o f t h e g e a r b o x , c ? n t r o l l s t / Z n d , 3 r d / 4 t h
5 t h and r e v e r s e g e a r s and a r e o p e r a t e d by a c r o s s s h a f t which may be r o t a t e d and
moved a x i a l l y by t h e remote g e a r l e v e r .
'C35' I n t r o d u c t i o n
I n e a r l y 1 9 8 4 , t h e 'C35' t y p e gearbox assembly was i n t r o d u c e d . T h i s d i f f e r s o n l y
i n d e t a i l from t h e e a r l i e r t y p e , w i t h most i n t e r n a l components b e i n g unchanged
o r improved and d i r e c t l y i n t e r c h a n g e a b l e w i t h t h e e a r l i e r p a r t . See p a r t s l i s t
f o r d e t a i l s .
-
A l l E s p r i t g e a r b o x e s a r e stamped w i t h a L o t u s s e r i a l number, r e p e a t e d on
i t s
matched c l u t c h h o u s i n g . A l l g e a r b o x e s stamped w i t h a 'C' p r e f i x t o t h e
s e r i a l number a r e t y p e C35.
Gearboxes w i t h t h e f o l l o w i n g s e r i a l numbers ( w i t h o u t
'C'
p r e f i x )
are
a l s o t y p e
2914
t o
2920
2954 t o 2974
3023 and 3024
3028 t o 3029
3044 t o 3152
A l l numbers
a r e
i n c l u s i v e and
are
t o b e found o n t h e t o p f r o n t o f t h e g e a r b o x
and ' a d j a c e n t s u r f
ace
o f t h e c l u t c h h o u s i n g .