Check List Of Clearances And Tolerances; Fuel Pump Checks And Adjustments - Mazda RX-7 Service Manual

ENGINE
ITEM D E S C R I P T I O N
V A L U E ( m m )
a
(!
q)
U'
c
(E
o
o
o
(r
A F
M i n i m u m c l e a r a n c e , r o t o r t o r o t o r h o u s i n g
0.40-0.70
A R
R o t o r h o u s i n g w i d t h - r o t o r w i d t h
0.13-0.17
A H
H e i g h t o f r o t o r l a n d
0.15-0.20
A G
C l e a r a n c e b e t w e e n a p e x s e a l a n d g r o o v e
0.065 +- 0.005
A S
R o t o r h o u s i n g w i d t h - a p e x s e a l l e n g t h
0 . 1 0 + 0 . 0 ' l
A C
Clearance between corner seal and groove
0.02-0.048
A E C l e a r a n c e b e t w e e n c o r n e r s e a l a n d s i d e s e a l
0 . 1 0 + 0 . 0 5
o
o)
'=
o
t
o
a
A p e x s e a l
More than 3.5
Corner seal
Stroke
more than
0.5
S i d e s e a l
O i l s e a l
o
'=
(6
o
co
Rotor bearing.
o i l c l e a r a n c e
A - ( B e a r i n g m i n . d i a . ) - ( J o u r n a l m a x . d i a . )
$ = ( B e a r i n g m a x . d i a . ) - ( J o u r n a l m i n . d i a . )
0.07-0.10
M a i n b e a r i n g
o i l c l e a r a n c e
A = ( B e a r i n g m i n . d i a . ) - ( J o u r n a l m a x . d i a . )
B = ( B e a r i n g m a x . d i a . ) - ( J o u r n a l m i n . d i a . )
0.05-0.08
E n d p l a y
0.04-0.07
o
o)
'6
o
I
Rotor housing S h r i n k a g e ( b e t w e e n d i m e n s i o n A a n d B , C , o r D )
0.06
S i d e
h o u s i n g
Surface distortion 0.04
S i d e s e a l s t e p p e d w e a r
0 . 1 0
o
o
o)
[U
T i m i n g A t i d l e s p e e d
T = 2 O i ( B T D C )
L=20" (BTDC)
l d l e R P M
1000-1500 RPM
V-belt
t e n s i o n
D e f l e c t i o n e q u i d i s t a n t b e t w e e n w a t e r p u m p
a n d a l t e r n a t o r
'10 -+ 1
q
_ E
o a T i p c l e a r a n c e
0.07-0.10
Check List Of Clearances And Tolerances
2 . F u e l p u m p .
B o t h t h e f u e l p u m p a n d r e l a y
s h o u l d b e m o u n t e d i n r u b b e r t o
m i n i m i z e v i b r a t i o n s , a n d t h e f u e l
p u m p m u s t b e i n s t a l l e d u P r i g h t ,
i n a v e r t i c a l p o s i t i o n , t o f u n c t i o n
p r o p e r l y . T h e f u e l l i n e s h o u l d b e
7 - B m m i n s i d e d i a m e t e r , a r r a n g e d
t o b e a s s h o r t a s p o s s i b l e a n d
r o u t e d t o a v o i d a n y h i g h t e m p e r a -
t u r e a r e a s ; i f r u b b e r h o s e i s u s e d
f o r l i n e s , u s e o n l y m i n e r a l - p r o o f
r u b b e r . F i n a l l y , d o n o t o p e r a t e t h e
p u m p w i t h o u t f u e l i n t h e t a n k a s
i t m a y s h o r t e n t h e p u m p l i f e .
N o t e : T h e f u e l f l o w s h o u l d b e 1 . 5
liters per 30 seconds, measured
a t t h e c a r b u r e t o r c o n n e c t i o n .
3 . F u e l f i l t e r .
U s e c a r e t o i n s t a l l i t f o r t h e c o r -
r e c t f l o w d i r e c t i o n .
4 . l d l e s p e e d .
The idle speed should be set as
low as possible to avoid back fir-
i n g .
5 . F u e l r e q u i r e m e n t .
The minimum oclane requirement
is 90. To provide sufficient lubri-
cation for internal parts, the fuel
musl be mixed with the correct
e n g i n e o i l i n a r a t i o , o i l - t o - f u e l , o f
1 : 1 0 0 - 1 : 1 5 0 , m e a s u r e d b y v o l u m e .
L - l
22