Mopar Muscle Association UK

Hi Guys,

This may sound a stupid question but if your using a piston stop tool to find TDC, how far do you screw in the adjusting part of the tool.

In other words, if I've wound the tool in too far, how do i know its not hitting the stop tool too early?

you need a degree wheel to get an accurate result, get damper somewhere near to the mark knowing its not a tdc insert the tool till it just touches, use a pointer (piece of stiff wire) put it as close to damper or degree wheel mark the damper or take note of degree wheel, turn engine opposite direction till piston hits the stop, note where it stops mark it or read degree wheel, exactly half way between the two marks should be tdc

Spot on Jim!

I just did this on the Coronet and it took a few goes with the adjustable depth for the optimum setting as you do not want it too deep as this just makes the two marked points quite a long way apart. A degree wheel is essential.

You can do it straight onto the damper, just measure halfway between the marks and that's TDC. Agreed though, a degree wheel gives the best accuracy.

I bought a TDC degree wheel off ebay for about £5.

Not nearly as good as the "professional" ones you see in the Youtube clips, but got me within half a degree, which is more than good enough for my purposes.