Starting And Warming Up The Engine; Driving Practices; Compression Check Procedure; Vll. Operating Procedures - Mazda RX-7 Service Manual

ENGINE
Vll. Operating Procedures.
Due to the high noise of the rotary
engine, we recommend using a
muffler around the garage or Pit
area.
An air cleaner is an absolute neces'
sity at all times to avoid loss of
compression from dirt entering
t h e e n g i n e .
C. Starting and warming up the engine.
B e f o r e s t a r t i n g t h e e n g i n e , a l w a Y s
c h e c k t h e e n g i n e o i l a n d c o o l a n l
a n d t h e V - b e l t t e n s i o n . A n d l o o k f o r
any loose parts or fasteners.
1 . S t a r t i n g p r o c e d u r e .
Depress the throttle Pedal a cou-
p l e o f t i m e s t o s q u i r t s o m e f u e l
i n t o t h e i n t a k e , t h e n c r a n k t h e e n -
g i n e w h i l e h o l d i n g t h e t h r o t t l e
a b o u t t w o - t h i r d s d o w n .
N o t e : O n c o l d d a Y s , c i r c u l a t e t h e
e n g i n e o i l f o r a s h o r t t i m e b e f o r e
s t a r t i n g .
2. Warm-up procedure.
( 1 ) F i r s t r e m o v e t h e r a d i a t o r c a P ,
t h e n s t a r t t h e e n g i n e . l m m e d i -
a t e l y a f t e r s t a r t i n g , c h e c k t h e
o i l p r e s s u r e a n d r e l e a s e a l l a i r
bubbles bY both squeezing the
water hose bY hand and racing
t h e e n g i n e a c o u P l e o f t i m e s ,
then re-tighten the cap secure-
l y .
T h e e n g i n e s h o u l d b e w a r m e d
at an idle speed of 2000-2500
R P M , p n t i l t h e o i l t e m P e r a t u r e
r e a c h e s 7 0 ' C o r 1 6 0 " F .
D u r i n g w a r m - u p , w a t c h f t , r
c o o l a n t a n d o i l l e a k s , a n d b e
c a r e f u l n o t t o f o u l a s p a r k
p l u g .
D. Driving practices.
1 . T h e m a x i m u m a l l o w a b l e e n g i n e
s p e e d i s 9 0 0 0 R P M .
2 . T e m p e r a t u r e a n d p r e s s u r e r e c o n l '
m e n d a t i o n s a r e a s f o l l o w s :
W h e n t h e o i l o r c o o l a n t t e m p e r a '
t u r e s e x c e e d t h e l i m i t s , w a t c h
c a r e f u l l y a n d c h e c k t h e s Y s t e m t o
d e t e r m i n e t h e c a u s e . l f t h e o i l
p r e s s u r e f a l l s b e l o w t h e l o w e r
l i m i t , s t o p t h e e n g i n e i m m e d i a t e '
ly and determine the cause before
p r o c e e d i n g .
Engine treatment after being run.
1 . P o u r a s m a l l a m o u n t o f e n g i n e o i l
t h r o u g h t h e c a r b u r e t o r t o P r e v e n t
i n t e r n a l r u s t .
2 . D u r i n g t h e w i n t e r , d r a i n t h e c o o l '
a n t c o m p l e t e l y .
Overhaul schedule.
Starting with a fresh engine, the over'
h a u l s c h e d u l e s a r e b a s e d o n e n g i n e
r e v l i m i t s u s e d d u r i n g r a c i n g , a s f o l '
l o w s :
G. Compression check Procedure.
U s e t h e r o t a r y e n g i n e c g m p r e s s i o n
tester, part number 49 0820 280K. A
n o r m a l c o m p r e s s i o n t e s t e r w i l l n o t
g i v e a r e a d i n g o n t h e c o n d i t i o n o f
e a c h i n d i v i d u a l w o r k i n g c h a m b e r .
1 . P r i o r t o m e a s u r e m e n t :
( 1 ) W a r m u P t h e e n g i n e .
(2) Remove the trailing spark plug.
(3) Screw the comPression tester
f i t t i n g i n t o t h e s P a r k P l u g h o l e .
( 4 ) D i s c o n n e c t t h e i g n i t i o n a t t h e
i g n i t o r .
2 . M e a s u r e m e n t P r o c e d u r e .
( 1 ) T h e c o m P r e s s i o n t e s t e r o P e r -
a t e s o n 1 2 v o l t s .
(2) To prclperly warm uP the trac'
i n g n e e d l e t h e c o m P r e s s i o n
t e s t e r m u s t b e t u r n e d o n f i v e
(5) seconds Prior to oPeration.
( 3 ) C r a n k t h e e n g i n e w i t h t h e
t h r o t t l e w i d e o P e n f o r 1 0 s e c '
o n o s .
(4) Turn off the Power to the com'
pression tester.
(5) Record the comPression read'
i n g s .
A.
B .
E.
F.
(2\
(3)
W i t h a r e v l i m i t o f :
R e b u i l d a f t e r :
9OOO RPM
2000-3000 km.
(1300-1900 mi.)
8 5 O O R P M
4000 km.
(2500 mi.)
Normal L i m i t
Coolant temperature
(outlet side)
70-90' c
( 1 6 0 - 1 9 5 ' F )
9 5 ' C
(205' F)
Oiltemperature
(oil pan)
9 0 - 1 1 0 " C
( 1 9 5 - 2 3 0 " F )
1 2 0 ' c
(250 " F)
Oil pressure
(f ilter inlet)
5.5-7.5 kg/cm' 0 kg/cm'
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