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Home >> Lincoln >> 1987 >> Mark VII Base >> Repair and Diagnosis >> Engine Mechanical >> Mechanical >> 5.0L V8 - VIN [F] & 5.0L Ho V8 - VIN [M] >> Removal & Installation >> Valve Springs >> Removal

Valve Springs: Removal

  1. Remove valve cover and spark plug on cylinder to be serviced. Be sure piston is at top of stroke with both valves closed. Install air line with adapter in spark plug hole. Apply minimum of 140 psi line pressure.
    NOTE: If air pressure fails to hold valve closed, remove cylinder head for inspection.
  2. Remove required rocker arm and push rod. Use spring compressor to compress valve spring and remove retainer locks, sleeve, spring retainer and valve spring. Remove and discard valve stem seal. Do not remove air pressure, as this will allow valve to fall into cylinder if piston has been moved to bottom of cylinder.
  3. Check valve spring for out of square with 90 degree straight edge. Valve spring out-of-square service limit is .078" (1.98 mm) for intake and exhaust springs on all models. Check valve spring compression pressure and replace any spring not within specification.
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