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Home >> GMC >> 1991 >> Value Van 7.4 N >> Repair and Diagnosis (Single Page) >> Engine Mechanical >> Mechanical >> 4.3L V6 - VIN [Z] >> Overhaul >> Fitting Pistons

Fitting Pistons

  1. Measure piston diameter at 90 degree angle to piston pin, on piston pin centerline. Measure cylinder bore diameter 2 1/2" below cylinder block deck. Determine piston clearance.
  2. If piston clearance is not within specification, replace piston and/or machine cylinder bore as necessary. See CYLINDER BLOCK table and PISTONS, PINS & RINGS table under ENGINE SPECIFICATIONS at end of article.
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