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Home › Jaguar › 1982 › XJ-S › Repair and Diagnosis › Engine Performance › Specifications › Tune-Up - V12 › Valve Clearance

Valve Clearance

  1. Adjust valves with engine cold. Remove valve covers and check that camshaft bearing caps are tightened to correct torque. Check clearance between heel of cam and valve tappet.
  2. Subtract correct valve clearance from clearance obtained. See  Valve Clearance Specifications   table.  Select adjusting pads equal to measurement and install under tappet.
  3. Adjusting pads are available in widths from 0.085 - 0.110" (2.16-2.79 mm) in increments of 0.001" (.03 mm). Pads are coded with letters A to Z, each letter corresponding to a thickness increase of 1 size.
    VALVE CLEARANCE SPECIFICATIONS

    Application Clearance In. (mm)
    Intake & Exhaust (Cold) .010-.012 (.25-.30)
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