Abstract: A timing device for locking a fly wheel of an engine in place for timing purposes comprising a bushing with a threaded portion at one end that engages a threaded aperture in the bell housing of a diesel engine. A timing or locking pin is disposed within the bushing and is movable longitudinally therein. A washer is disposed between the locking pin and the bushing. A spring is attached at either end to the washer. The spring may be used to bias the locking pin into engagement with a detent in the flywheel. Removal of the spring from the locking pin allows the pin to be removed from the detent in the flywheel.