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Home >> Saab >> 1982 >> 900 S, 2D Hatchback, Automatic Trans >> Repair and Diagnosis (Single Page) >> Engine Mechanical >> Mechanical >> 900 & 900 Turbo 4-Cylinder >> Pistons, Pins & Rings >> Fitting Pistons

Fitting Pistons

  1. To fit pistons to cylinder bores, use a feeler gauge 0.500" (12.7 mm) wide and 0.0005 - 0.0016" (0.014 - 0.040 mm) thick. Oil cylinder lightly and insert piston without rings.
  2. Attach feeler gauge to a spring scale. Insert feeler gauge between piston and cylinder wall at right angles to piston pin. When feeler gauge can be pulled out of cylinder with a force of 1.8-2.6 lbs. (.816-1.18 kg), piston clearance has been determined.
  3. Repeat test at several different depths in cylinder bore. Graded standard and non-graded oversize pistons are available.
    PISTON SPECIFICATIONS

    Application Diameter In. (mm)
    Exc. Turbo
      Std. (AB) 3.5425-3.5427 (89.980-89.986)
    Std. (C) 3.5433-3.5437 (89.999-90.010)
    1st Oversize 3.5619-3.5625 (90.472-90.487)
    2nd Oversize 3.5816-3.5822 (90.972-90.987)
    Turbo
      Std. (AB) 3.5421-3.5424 (89.970-89.976)
    Std. (C) 3.5427-3.5434 (89.986-90.002)
    1st Oversize 3.5614-3.5620 (90.460-90.475)
    2nd Oversize 3.5811-3.5817 (90.960-90.975)
  4. Check piston rings for end gap and side clearance, using an inverted piston to position ring in bore. On worn bores, measure at lower end of bore.
  5. Install rings on pistons, staggering ring gaps. Compression ring gaps should be located above piston pin (180° from each other). Oil ring gaps should be equally spaced from each other.
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