Top Dead Center Indicator

• Tool whistles as the piston approaches Top Dead Center (TDC) on the compression stroke and stops whistling when the piston reaches TDC. • Helps to eliminate the guesswork involved when diagnosing jumped timing belts and timing chains. • Aids in valve adjustments and installation of distributors, timing belts and timing chains. • 2-in-1 fitting threads into all 14mm and 18mm spark plug ports. • 27" overall length. • Not for use on diesel engines.