Mazda MX-5 NA silhouetteMX-5 NA

ENGINE TUNE-UP PROCEDURE

B-6prose procedure

P/S and A/C equipped variants have different belt routings.

Continued from B-5

Drive belt deflection

  1. 4
    Check the drive belt deflection by applying moderate pressure (98 N, 10 kg, 22 lb) midway between the pulleys, as shown. Adjust if necessary.
    Drive belt routing diagram for P/S or P/S + A/C EQUIPPED vehicles. Shows pulleys: ALTERNATOR (top-left), P/S (top-right), CRANKSHAFT (center-bottom), A/C (right-bottom) with arrows indicating measurement points between alternator-crankshaft and crankshaft-P/S.
    05U0BX-010

Deflection

Drive belt deflection

Alternator
New mm (in)8.0—9.0 (0.31—0.35)
Used mm (in)9.0—10.0 (0.35—0.39)
P/S, P/S + A/C
New mm (in)8.0—9.0 (0.31—0.35)
Used mm (in)9.0—10.0 (0.35—0.39)
A/C
New mm (in)8.0—9.0 (0.31—0.35)
Used mm (in)9.0—10.0 (0.35—0.39)

Tension check

  1. 5
    Check the drive belt tension with the SST (tension gauge).
    Belt tension can be measured between any pulleys.
    SST 49 9200 020 tension gauge being used on a drive belt. Shows the gauge being placed on a belt over a pulley (WHEN SET) and the measurement display (WHEN MEASURED).
    05U0BX-012

Tension

Drive belt tension

Alternator
New N (kg, lb)491—589 (50—60, 110—132)
Used N (kg, lb)422—491 (43—50, 95—110)
P/S, P/S + A/C
New N (kg, lb)491—589 (50—60, 110—132)
Used N (kg, lb)422—491 (43—50, 95—110)
A/C
New N (kg, lb)491—589 (50—60, 110—132)
Used N (kg, lb)422—491 (43—50, 95—110)

Install

  1. 6
    Install the air intake pipe.

Adjustment

(1) Alternator belt

  1. 1
    If necessary, loosen the alternator bolts A and B and adjust the belt deflection by turning the adjusting bolt C.
    Alternator belt adjustment view showing bolts labeled A, B, and C used for loosening alternator bolts and adjusting belt deflection.
    05U0BX-013
Tightening torque A (alternator belt)
19 - 25N·m
Tightening torque B (alternator belt)
37 - 52N·m

(2) P/S belt, P/S + A/C belt

  1. 1
    If necessary, loosen the P/S oil pump bolt A and nuts B and C and adjust the belt deflection by turning the adjusting bolt C.
    P/S oil pump and A/C belt adjustment view showing bolts labeled A, B, C used for loosening and adjusting the P/S, P/S + A/C belt deflection.
    05U0BX-014
Tightening torque A (P/S belt)
31 - 46N·m
Tightening torque B (P/S belt)
36 - 54N·m
Tightening torque C (P/S belt)
19 - 25N·m
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