OTC 6024 Crankshaft Positioning Tool for Ford Designed for use on Ford 1993-2004 4.2L 2 valve, 4.6L 4-valve, 5.4L V8, and 6.8L V10 engines when installing timing chains These engines are not free-wheeling , and if an engine has "jumped time," it is possible the cylinder heads have to be removed because of damage to the valves or pistons Easily installs over the crankshaft and engine front cover alignment dowel to position the crankshaft at top-dead-center  the correct position for timing chain installation