LEMON Manuals: Even more car manuals for everyone
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 Pistons

Fitting Pistons

  1. Using telescope gauge and micrometer, measure cylinder bore diameter at a point 2 1/2" (64 mm) from top of bore. Measure piston diameter across piston skirt, at center line of piston pin. Difference between the two measurements is piston-to-cylinder bore clearance.
  2. Using cylinder bore gauge, measure cylinder bore taper by working gauge up and down in bore. Measure cylinder bore out-of-round. Take measurements at different points in bore, by rotating gauge horizontally, around entire circumference of bore. Out-of-round must not exceed .002" (.05 mm). Taper must not exceed .005" .13 mm).
  3. If taper or out-of-round are not within limits, hone or bore cylinders for installation of new pistons.
scientia non olet · About LEMON Manuals