Service manual

Evolution FORD 7.3 Liter

(Looking up at the exhaust manifold from under the vehicle.)

2. Drill a 5/16” hole, then use the pipe tap to cut the threads. Use a 1/8” National

Pipe Tap (NPT tap, available at your hardware store), follow the instructions

with the tap. The pipe tap is tapered, so you only want to turn the tap until the

bottom threads of the tap are slightly deeper than flush with the inside of the

exhaust manifold wall. Use caution not to tap too far since the fitting will have

to be screwed in very deeply.

3. Now that you have drilled and tapped the manifold, install the fitting by

tightening the tapered thread end into the manifold. Ideally the tip of the fitting

would be flush with the inside of the exhaust flow path, and not much deeper.

Tighten the fitting so that it is securely mounted. To install the probe in the

fitting, slide the probe into the fitting so that the tip is approximately centered

in the exhaust gas stream. Tighten the top nut of the fitting just tight enough to

keep the probe firmly mounted.

The EGT

thermocouple

installed into the

drilled and

tapped exhaust

manifold.