You need to remove the spark plugs to ease crankshaft/engine rotation, the engine front cover, the right bank secondary camshaft drive chain tensioner, the right bank secondary camshaft drive chain shoe, the right bank secondary camshaft drive chain guide, the right bank secondary camshaft drive chain, the primary camshaft drive chain tensioner, the primary camshaft drive chain upper guide, the primary camshaft
Timing Chain and the crankshaft sprocket from the nose of the crankshaft.