An essential engine service tool this crankshaft locking pin is compatible with various ford models and some mazda and volvo models the pin simply screws into the side of the engine to locate the crankshaft in the timed position the pin then locks the crankshaft in this position ensuring your engine timing stays set correctly as you work on it having the correct engine timing is vital as it ensures your engine starts and runs correctly making this pin a must have service toolcompatible mo