To Check/Adjust Valve Timing

-- Remove the cylinder head cover. Refer to CYLINDER HEAD COVER .

-- Perform the work steps in "Crankshaft, Locking". Refer to CRANKSHAFT, LOCKING .

NOTE:

If the threaded holes in the camshafts -arrows- do not align upward, the crankshaft must be rotated one rotation (360°) in engine rotation direction.

Fig 1: Identifying Threaded Holes

Courtesy of VOLKSWAGEN GROUP OF AMERICA, INC.

In order to be able to precisely check and adjust the valve timing, always note the following:

• Rotate the crankshaft only in engine rotation direction -arrow-. Do not rotate the crankshaft back, not even slightly!
  Fig 2: Identifying Crankshaft Turned Only In Direction Of Engine Rotation

  Courtesy of VOLKSWAGEN GROUP OF AMERICA, INC.
• The crankshaft must not be rotated past the Top Dead Center (TDC) mark. This means the bore -2- in the crankshaft must not be above the threaded opening in the cylinder block.
  Fig 3: Identifying Crankshaft Must Not Be Rotated Out Over TDC Marking

  Courtesy of VOLKSWAGEN GROUP OF AMERICA, INC.

If the crankshaft was rotated past the TDC mark:

-- Rotate the crankshaft back 45° in the opposite direction of engine rotation.

-- Then rotate the crankshaft again to the TDC position in engine rotation direction.

When the crankshaft is positioned slightly in front of the TDC position (the bore in the crankshaft is 90% visible), the locking pin T40069 can be installed, although slightly more difficult.