Mazda MX-3 silhouetteMX-3

ENGINE TUNE-UP

B2-7prose procedure

K8 engine (1.8L V6) drive belt tension/adjustment by accessory.

Drive belt tension check

Belt tension can be checked in place of belt deflection.

Drive belt tension check

  1. 1
    Check the drive belt tension when the engine is cold, or at least 30 minutes after the engine has stopped. Using the SST, check the belt tension between any two pulleys.
    Diagram showing use of SST 49 9200 020A V-ribbed belt tension gauge on the drive belt. Left/bottom shows the gauge WHEN SET; right shows the gauge WHEN MEASURED clamped on the belt between two pulleys.
  2. 2
    If the tension is not within the specification, adjust it. (Refer to below.)

Tension — N {kgf, lbf}

Generator
New *690-880 {70-90, 160-190}
Used500-680 {50-70, 110-150}
Limit440 {45, 99}
Generator + A/C
New *690-880 {70-90, 160-190}
Used500-680 {50-70, 110-150}
Limit440 {45, 99}
P/S
New *540-680 {55-70, 130-150}
Used400-530 {40-55, 90-120}
Limit340 {35, 77}

Adjustment — Generator + A/C, Generator

  1. 1
    Loosen idler pulley locknut (A).
    Generator/A/C accessory area showing idler pulley adjustment. Callout (A) marks the idler pulley locknut (lower arrow), callout (B) marks the adjusting bolt (upper arrow).
  2. 2
    Adjust the belt deflection by turning adjusting bolt (B). Deflection (Generator + A/C) New: 5.5-6.5 mm {0.22-0.25 in}, Used: 6.5-7.5 mm {0.26-0.29 in}. (Generator) New: 6.0-7.0 mm {0.24-0.27 in}, Used: 7.0-8.0 mm {0.28-0.31 in}.
  3. 3
    Tighten pulley locknut (A). Tightening torque: 32-46 N·m {3.2-4.7 kgf·m, 24-33 ft·lbf}.

P/S

Adjustment — P/S

  1. 1
    Loosen idler pulley locknut (A).
    P/S pump area showing idler pulley adjustment. Callout (A) marks the idler pulley locknut (upper arrow), callout (B) marks the adjusting bolt (lower arrow).
  2. 2
    Adjust the belt deflection by turning adjusting bolt (B). Deflection New: 6.0-7.0 mm {0.24-0.27 in}, Used: 7.0-8.0 mm {0.28-0.31 in}.
  3. 3
    Tighten pulley locknut (A). Tightening torque: 32-46 N·m {3.2-4.7 kgf·m, 24-33 ft·lbf}.

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