To ensure the utmost in timing precision, the true TDC of all engines should be checked to confirm the accuracy of the pulley TDC mark in relation to the real TDC. This tool screws into the spark plug hole and gives a mechanical indication of where the piston is in relation to the pulley/crankshaft. By rotating the crankshaft and touching/bumping the piston against the dead stop BTDC, and then rotating the engine in the opposite direction and touching/bumping the piston again against the dead stop ATDC, recording both measurements on a degree wheel, the pulley, or our DigiDix- SR095, you can calculate pure TDC. Available for either 12mm or 14mm spark plug holes. Sold separately.
Video Instructions (SR022, SR023)