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Home >> Geo >> 1990 >> Metro Base, 4D Hatchback, Automatic >> Repair and Diagnosis >> External Pages >> Different car >> Section 15 (1.0L 3-CYL - VIN [5] & 1.0L 3-CYL Turbo - VIN [2]) >> Overhaul >> Fitting Pistons & Rings >> Notes

Fitting Pistons & Rings: Notes

WARNING: This page is about a different car, the 1988 Chevrolet Sprint. However, it is still accessible from the selected car via links, so may be relevant.
  1. Check cylinder bores for scratches, roughness or ridges which indicate excessive wear. Using a cylinder bore gauge, measure cylinder bore in thrust and axial directions. Take measurements at 1.96" (50.0 mm) and again at 3.74" (95.0 mm) from top of cylinder bore.
  2. There are 3 numbers stamped on top of cylinder block, toward crankshaft pulley side. They identify cylinder bore diameter. The left number identifies cylinder No. 1, the center number identifies cylinder No. 2 and the number to the right identifies cylinder No. 3.
  3. Measure bore diameter, taper and out-of-round. If specifications are exceeded, rebore all cylinders to next oversize. Measure outer diameter of piston and determine piston-to-bore clearance. Measure piston .60" (15.0 mm) from bottom of piston skirt at a 90 degree angle to piston pin bore.
  4. Piston-to-bore clearance should be .0008-.0015" (.02-.04 mm). Numbers stamped on piston heads identify piston outer diameter. Pistons are stamped with either a "1" or "2". When installing standard pistons, ensure that piston is matched with cylinder. Oversize pistons are available in .010" (.25 mm) and .020" (.50 mm).
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