Setting your 4.0 to #1 TDC


With #1 spark plug removed, turn the engine over clockwise using the 3/4″ front crankshaft bolt.

You will see the degree marks on your front cover and you will see the timing mark on the balancer. Mark them with chalk or white-out.

While turning the engine over, put your finger/thumb over #1 spark plug hole. As the mark on the balancer approaches the marks on the front cover, if you are coming up on #1 TDC, pressure in the cylinder will push on your finger. If there’s no pressure, you’re at #6 TDC and need to crank the engine over until you see the marks coming together and you get pressure. Set the mark on the balancer to the 0 mark on the front cover.

TDC damper

Revised 1-31-2016

11 thoughts on “Setting your 4.0 to #1 TDC”

  1. /ok
    So, what if your block has a different indicator scale on it?
    Mine is similar, but has a … tube about where your 0 (zero) is.

    Well I hope that tube/ hole is close enough to where the Zero is supposed to be.

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