Innovative Products Extended TDC Indicator

There are a few procedures that require knowing when a given piston is at TDC. There are a couple of techniques for measuring it, but this tool from Innovative Products makes it super easy. It is a spring-loaded indicator rod that threads into the spark plug hole and rides on the piston as the engine is (MANUALLY!) rotated.

TDC Indicator

Here it is in use.

TDC Indicator in use

As a tool, it really is overkill - I've got machine tools made to lesser standards - but it saves a bunch of futzing around. There is no question when the piston is at TDC as the indicator makes it very obvious.

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