OEM Lincoln LS Exhaust Valve

Lincoln LS Exhaust Valve Parts Questions & Experts Answers

• Exhaust Valve
  XW4Z-6505-AA
  Q: How to Adjust the Intake Valve and Exhaust Valve Clearance on Lincoln LS?

  A: Timing Chains need removal as the first step for valve clearance adjustment work. The feeler gauge measurements of base circle valve clearances should happen before Camshaft removal because you cannot fix the shims while the camshafts are in place; premature removal of clearances will require you to repeat this process unnecessarily. Note down the positions of each measurement. First remove the camshafts before removing shims that display their thickness values such as the 2.22 mm shim bearing the 222 code. The new shims must have a targeted intake clearance of 0.18 - 0.22 mm (0.00709 - 0.00866 inch) and an exhaust clearance of 0.33 - 0.38 mm (0.0128 - 0.0148 inch) but optimal performance occurs when using shims established for 0.20 mm (0.00787 inch) for intake and 0.35 mm (0.014 inch) for exhaust. Set the required shim thickness by adding the measured clearance value and the base shim thickness but subtracting the most preferred clearance. Make markings to indicate the correct installation position of the shims before inserting both new shims and the camshaft into place. The procedure ends with measuring newly adjusted valve clearances before reinstalling the timing chains.