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Home >> GMC >> 1983 >> Forward Control 7.4 W, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Fuel Injection System - Diesel >> Removal & Installation >> Injection Pump Seal Replacement >> Automatic Advance Seals

Automatic Advance Seals

  1. Remove advance pin hole plug as previously described. Remove spring side advance piston hole plug. Remove plug, piston, spring and washer.
  2. Remove power side advance piston hole plug. Remove plug, piston and washer. Disassemble plugs and pistons. Discard seals.
  3. Lubricate and install new seals. Reverse removal procedure and tighten plugs. See Figure.
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