Top Dead Center Tool 8016MRG TDC Whistle – Universal Top Dead Center Indicator with 14mm/18mm Spark Plug Ports – Top Dead Center Whistle for Distributor Installation, Timing & Valve Adjustment

Precise TDC Detection: The TDC whistle produces a clear, audible sound as the piston approaches top dead center (TDC) during the compression stroke—stopping right when TDC is reached. This makes it easy to pinpoint TDC for ignition timing, valve adjustments, and cylinder diagnostics

Compatible with 14mm & 18mm Spark Plug Ports: Top dead center tool features a dual-size threaded fitting that easily installs into both 14mm and 18mm spark plug holes—compatible with most gasoline engines. Not for use on diesel engines

Versatile Applications for Engine Work: Top dead center whistle perfect for distributor installation, individual cylinder valve setting, timing belt or chain inspection, and cylinder leak down testing—essential for mechanics and DIYers alike

Quick, Tool-Free Installation: No tools required—just hand-thread the TDC whistle into the spark plug port and you're ready to go. The 27-inch overall length makes it easy to position and hear, even in tight engine bays

Audible Compression Stroke Indicator: The TDC whistle tool makes it easy to detect the compression stroke by ear—no need to visually inspect pistons or rely solely on timing marks. MainUseool TDC compression indicator perfect for both beginners and professional mechanics

Take the guesswork out of engine timing with the 8016MRG TDC Whistle—a simple yet highly effective tool designed to help you locate Top Dead Center (TDC) quickly and accurately. Whether you're installing a distributor, adjusting valves, or inspecting the timing belt or chain, this TDC whistle tool offers an audible cue during the compression stroke and stops whistling the moment the piston reaches TDC. No need to remove valve covers or interpret unclear timing marks—the sound does the work for you. Compatible with most gasoline engines, the top dead center tool features a dual-threaded fitting for 14mm and 18mm spark plug ports. Just hand-thread it into the spark plug hole, rotate the crankshaft in the normal direction, and listen for the whistle. It’s that easy. Built with a 27-inch length for convenience and easy handling, this top dead center whistle is perfect for both beginners and professional mechanics looking for a reliable way to verify TDC during engine service. Important Safety Notes: Ensure the engine is off and cool before using this tool. Avoid contact between the rubber hose and hot engine parts. Keep hands away from rotating or moving components. Always follow your vehicle manufacturer’s service procedures. Note: This TDC indicator is intended for use on gasoline engines only. Not suitable for diesel engines