TIMING CHAIN RETAINER TO SUIT HOLDEN CALAIS VZ VE ALLOYTEC LY7 3.6L V6This tool is required to service the camshaft position actuators (phasers) as well as the camshafts, camshaft followers, lifters, valve springs and valve seals on Alloytec High Feature V6 engines with the 7. 7mm timing drive system. Without this tool, repair or replacement of any of the aforementioned engine components will require the removal of the timing cover and the disassembly of the entire camshaft timing system resulting in excessive labour