Lotus TURBO ESPRIT Service Manual page 333

SECTION Kt3
Page
7
K B . l
-
GENERAL DESCRIPTION
--
A c e n t r i f u g a l w a t e r pump i s mounted on t h e f r o n t f a c e of t h e c y l i n d e r
b l o c k and
i s
d r i v e n by a s i n g l e
'V'
b e l t from t h e c r a n k s h a f t . C o o l a n t
is pumped by t h e i m p e l l o r i n t o t h e f r o n t o f t h e b l o c k , a r o u n d t h e ' w e t '
c y l i n d e r l i n e r s and i n t o t h e c y l i n d e r h e a d .
E s p r i t S3 and U.S.A. T u r b o : Water l e a v e s t h e c y l i n d e r head v i a a p i p e
c a s t i n t e g r a l l y w i t h t h e i n l e t m a n i f o l d , w i t h , o n U.S.A. Turbo models, a n
a d d i t i o n a l o f f t a k e from t h e f r o n t f a c e o f t h e h e a d , and f l o w s i n t o t h e
t h e r m o s t a t h o u s i n g which i s above and i n t e g r a l w i t h t h e w a t e r pump
h o u s i n g .
When t h e t h e r m o s t a t i s c l o s e d , w a t e r f l o w s downwards back i n t o
t h e w a t e r pump t o commence a n o t h e r c y c l e . When t h e t h e r m o s t a t o p e n s ,
t h i s r o u t e i s c l o s e d o f f and w a t e r i s d i r e c t e d upwards p a s t t h e t h e r m o s t a t
and i n t o pipework l e a d i n g t o t h e f r o n t mounted r a d i a t o r . C o o l a n t r e t u r n i n g
from t h e r a d i a t o r f l o w s back i n t o t h e w a t e r pump i m p e l l o r h o u s i n g t o
commence a n o t h e r c y c l e .
DOM/ROW Turbo: On t h e s e c a r s , w a t e r l e a v e s t h e c y l i n d e r h e a d from a p i p e
i n i t s f r o n t f a c e and v i a o u t l e t s between t h e i n l e t p o r t s l i n k e d by an
e x t e r n a l c o l l e c t o r p i p e . T h e s e two s t r e a m s c o n v e r g e and f l o w t o a r e m o t e l y
mounted t h e r m o s t a t a t t h e r i g h t hand f r o n t o f t h e e n g i n e bay. When t h e
t h e r m o s t a t i s c l o s e d , w a t e r i s d i r e c t e d v i a a ' b y - p a s s ' pipework r o u t e
back t o t h e w a t e r pump, b u t when t h e t h e r m o s t a t o p e n s , c o o l a n t f l o w s f o r w a r d
t o t h e f r o n t mounted r a d i a t o r b e f o r e r e t u r n i n g t o t h e w a t e r pump.
A h e a d e r t a n k
i s
f i t t e d a t t h e r i g h t hand r e a r of t h e e n g i n e bay and i s
c o n n e c t e d w i t h t h e w a t e r punp i n l e t pipework (S3
& U S A )
o r t h e by-pass
pipework (DOM/ROW T u r b o ) .
The r a d i a t o r i s l o c a t e d i n t h e n o s e o f t h e c a r and
i s
mounted i n t o a
G.R.P. r a d . d u c t f i x e d t o t h e u n d e r s i d e o f t h e s p o i l e r and f r o n t l u g g a g e
compartment. Turbo models u s e a f u l l w i d t h r a d i a t o r p r o v i d e d w i t h 3 c o o l i n g
f a n s w h i l s t S e r i e s 3 v e h i c l e s u s e a s m a l l e r 2/3 w i d t h r a d i a t o r w i t h 2
c o o l i n g f a n s . S e r i e s 3 c a r s w i t h a i r c o n d i t i o n i n g have a s i m i l a r l y s i z e d
c o n d e n s o r mounted ahead o f t h e r a d i a t o r and o f f s e t t o t h e o p p o s i t e s i d e of
t h e r a d . d u c t w i t h t h e non o v e r l a p p i n g p o r t i o n
p r o v i d e d w i t h
i t s
own c o n d e n s o r
c o o l i n g f a n .
KB.2
-
DRAIN/REFILL PROCEDURE
- -
It i s most i m p o r t a n t t h a t t h e c o o l a n t c o n t a i n s a c o r r o s i o n i n h i b i t o r t o
p r o t e c t t h e aluminium a l l o y o f t h e L o t u s e n g i n e .
A minimum o f 25%
i n h i b i t o r / a n t i f r e e z e s h o u l d b e u s e d a l l y e a r round w i t h up t o 60% i n t h e
c o l d e s t c l i m a t e s .
A l l c a r s a r e f i l l e d w i t h a 40%mix a t t h e f a c t o r y .
To d r a i n t h e s y s t e m ,
set t h e h e a t e r t e m p e r a t u r e c o n t r o l t o h o t , r e l e a s e
t h e h e a d e r t a n k c a p and remove t h e r a d i a t o r d r a i n p l u g .
Also
r e l e a s e
h o s e c o n n e c t i o n s i n t h e e n g i n e bay
as
n e c e s s a r y
t o
f u l l y d r a i n pipework
To r e f i l l t h e s y s t e m , r e f i t h o s e c o n n e c t i o n s s e c u r e l y , r e p l a c e d r a i n p l u g
a n d , on Turbo m o d e l s , open t h e r a d i a t o r b l e e d p l u g from i n s i d e t h e
f r o n t l u g g a g e compartment.