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True Tdc

How to Degree a Cam

Discussion and questions related to the course How to Degree a Cam


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I followed the process as displayed but I'm still curious as to after I find these values. Add them together then divide by 2. Once the pointer is moved to face the sum value of those 2 numbers..Is true tdc that value in the operating direction of the crank? Or do you move it back to the markings on the sprocket to begin?

I'm not sure I follow your question? The key point to understand is that you'll end up with two marks on your degree wheel from the two places that the piston contacts the stop. True TDC is exactly in between these two marks. By adding the two degree values together and dividing by two, you'll find this value. At this point you can move your pointer or you can loosen off the degree wheel and rotate it to correct any error. If I haven't explained this clearly enough, please let me know how else I can help.