Mazda MX-3 silhouetteMX-3

CHARGING SYSTEM — Inspection (Rectifier, Brush, Brush spring)

G-17spec table

Brush length and brush spring force specs differ between K8 DOHC and B6 DOHC.

Rectifier

  1. 1
    Check continuity of the diodes with an ohmmeter.
    Rectifier diode schematic showing the diode bridge with terminals B, E, T and stator-phase taps Pn, P1, P2, P3. Top row of diodes connects to B, bottom row to T, with E as ground.
  2. 2
    Replace the rectifier if not as specified.

Rectifier diode continuity

E
PositivePn, P1, P2, P3
ContinuityYes
B
PositivePn, P1, P2, P3
ContinuityNo
T
PositivePn, P1, P2, P3
ContinuityNo
Pn, P1, P2, P3
PositiveE
ContinuityNo
Pn, P1, P2, P3
PositiveB
ContinuityYes
P1, P2, P3
PositiveT
ContinuityYes
Pn
PositiveT
ContinuityNo

Brush

If a brush is worn almost to or beyond the limit, replace all the brushes.
StandardK8 DOHC
21.5 mm {0.85 in}mm
StandardB6 DOHC
20.0 mm {0.79 in}mm
MinimumK8 DOHC
8.0 mm {0.32 in}mm
MinimumB6 DOHC
5.0 mm {0.20 in}mm

Brush spring

  1. 1
    Using a spring pressure gauge, measure the brush spring pressure with the brush tip projecting 2 mm {0.079 in}.
    Hand using a spring pressure gauge to measure brush spring pressure with the brush tip projecting 2 mm {0.079 in}.
  2. 2
    Replace the spring if necessary.
Standard forceK8 DOHC
3.2—4.3 N {0.32—0.44 kgf, 0.71—0.96 lbf}N
Standard forceB6 DOHC
4.7—5.8 N {0.47—0.60 kgf, 1.04—1.29 lbf}N
MinimumK8 DOHC
1.6—2.3 N {0.16—0.24 kgf, 0.36—0.52 lbf}N
MinimumB6 DOHC
2.4—3.1 N {0.24—0.32 kgf, 0.53—0.70 lbf}N

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