This tool is required on engines where the flywheel & crankshaft must be held at the correct timing position. After attaching the Flywheel Locking plate, the toothed profile is adjusted & locked after being fully engaged in the flywheel ring gear. Covers most engines in the Ford range (pre 2007) including both petrol & diesel & the Zetec engine. This tool is required on engines where the flywheel & crankshaft must be held at the correct timing position. After attaching the flywheel locking plate, the toothed profile is adjusted & locked after being fully engaged in the flywheel ring gear.