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Home >> GMC >> 1983 >> Forward Control 5.7 M, Automatic, 400/M40 >> Repair and Diagnosis (Single Page) >> Engine Mechanical >> Mechanical >> 4.1L 6-CYL - VIN [D] >> Removal & Installation >> Fitting Rings

Fitting Rings

  1. Position ring into cylinder bore at a point about 1/4" above ring travel. Ring must be square in bore. Measure ring end gap with a feeler gauge.
  2. Before installing compression rings on pistons, check side clearance. Insert outer edge of ring in its respective groove, and slide ring around entire circumference of groove. The ring should slide freely in groove.
  3. Check side clearance of compression rings, with feeler gauge inserted between ring and ring groove. Install rings with gaps properly positioned. Note that anti-rotation tang of oil ring spacer is inserted into oil hole (or slot) of piston. See Fig 1.
Fig 1: Desired Ring Gap Locations
G91194