Brush Spring; Rectifier; Drive Belt Inspection; Drive Belt Deflection - Mazda MX-5 1990 Workshop Manual

CHARGING SYSTEM
G
Brush Spring
1. Measure the force of the brush spring with a spring pres-
sure gauge.
2. Replace the spring if necessary.
Standard force:
3.1-4.3 N (320-440 g,
11.3-15.5 oz)
Minimum: 1.6-2.4 N (160-240 g, 5.6-8.5 oz) ...
Note
- • Read the spring pressure gauge at a brush tip
L -_ _ _ _ _ _ _ _ _ _ _ _ _ - l
projection of 2mm (0.079 in).
T
05UOGX-033
B
E (HEAT SINK)
05UOGX-034 .
V BELT
~
V RIBBED BELT
~~~
x
0
x
05UOBX-009
PIS or PIS
+
AIC EUIPPED
05UOBX-010
Rectifier
1 . Check for continuity of the diodes with an ohmmeter.
Negative (Black) Positive (Red)
E
B P1, P2, P3
T
E
P1, P2, P3 B
T
2. Replace the rectifier if necessary.
DRIVE BELT
Inspection
1 . Remove the air intake pipe.
Continuity
Yes
No
No
No
Yes
Yes
2. Check the drive belts for wear, cracks, or fraying. Replace
if necessary.
3. Verify that the drive belts are correctly mounted on the
pulleys.
4. Check the drive belt deflection by applying moderate pres-
sure (98 N, 10 kg, 22 Ib)
midway between the pulleys as
shown in the figure. Adjust if necessary.
Deflection
mm (in)
Drive belt New Used
Alternator
8.0-9.0 9.0-10.0
(0.31-0.35)
(0.35-0.39)
PIS, PIS + A/C
8.0-9.0 9.0-10.0
(0.31-0.35) (0.35-0.39)
A/C
8.0-9.0 9.0-10.0
(0.31-0.35) (0.35-0.39)
G-15