Feature APPLICATION — Fits for Detroit Diesel DD13 and DD15. FUNCTION — Use with the DDC procedure to set gear timing for cam installation. BENEFITS — Great for Camshaft Timing Verification. Ensure Correct Camshaft Timing. ALTERNATIVE TO — Same as J-47487 & J-48630. Manufactured from quality steel, using top of the line machining and measuring equipment to ensure each part is manufactured to OEM specifications. .