Camotokiit 4795 TDC Piston Stop Tool 14mm Bolt-Style (Heads-On) — Steel, M14 x 1.25

Camotokiit 4795 is a 14 mm bolt-style steel piston stop that screws into a spark plug hole to positively locate Top Dead Center (TDC) with the engine heads installed.

This precision-engineered TDC tool gives mechanics and home tuners a reliable, repeatable reference point for timing, camshaft work, compression checks, and engine assembly when you need to find true piston Top Dead Center without removing cylinder heads. Made from cadmium-finished steel and threaded M14 x 1.25, the bolt-style design installs through the spark plug bore, halting piston travel gently and securely so you can mark or index crank position safely.

How does this piston stop help me find TDC accurately?

The Camotokiit 4795 physically prevents the piston from travelling past its topmost point, creating an unmistakable mechanical stop so you can identify TDC precisely. Unlike visual timing marks alone, a piston stop measures actual piston position relative to crank rotation.

• Threads into M14 x 1.25 spark plug hole for direct piston contact
• Steel construction with cadmium finish resists wear and corrosion
• Provides a tactile, repeatable stop for precise crank indexing

Can I use this tool with the cylinder heads still on?

Yes — this item is the bolt-style, heads-on version designed specifically to be used without removing cylinder heads. It screws into the spark plug well so you can find TDC on assembled engines.

• Heads-on application avoids disassembly and saves time
• Ideal for engines with accessible spark plug threads
• Single-piece design for quick installation and removal

Is the 14 mm thread compatible with my vehicle?

The tool is threaded M14 x 1.25, which fits many common spark plug ports and performance engines. Verify your engine's spark plug thread size before purchase to ensure fit; adapters or alternate sizes are available from other suppliers when needed.

• Thread spec: 14 mm x 1.25 pitch (M14 x 1.25)
• Check factory service manual for your vehicle's spark plug thread size
• Works on many performance and racing applications with M14 plugs

What precautions should I take when using the piston stop?

Use hand force rather than power tools to thread the stop in and out to avoid damaging threads or the piston. Rotate the crankshaft slowly by hand against the stop and never force the engine past the tool to prevent component damage.

• Install and remove by hand; no impact or air tools
• Turn crankshaft slowly and observe resistance as piston contacts the stop
• Keep threads clean and lightly lubricated to prevent galling

Who is this for: The Camotokiit 4795 TDC piston stop is aimed at professional mechanics, engine builders, and DIY enthusiasts who need a straightforward, durable method to locate Top Dead Center on engines with heads in place. It's especially useful for high-performance and racing applications, timing work, valve adjustments, and any situation where precise crankshaft indexing is required. New units ship ready to use, and the cadmium-plated steel construction gives long service life in workshop conditions.