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Installing the Pyrometer:
Supplies:
- 1/8" NPT Tap
- 21/64" Drill Bit or a Type "R" (.339") Drill Bit
- 3/8" Socket Extension 10"
- Tap Wrench
- Safety Glasses or Goggles
- 5/64" Hex Wrench
The correct drill bit for a 1/8" NPT Tap is a Type "R" (.339"). Some 1/8" NPT taps come packaged with a Type "R" bit. However, a 21/64" bit (.328") will work just fine in the event a Type "R" cannot be located or if it is not packaged with the tap.
The 10" socket extension (3/8") is recommended for easier reach during the tapping process. The tap fits in the female end of the extension and can be made secure by simply wrapping the end of the tap with some painters tape.
This is the correct location to drill and tap the manifold. Do not grease or coat the drill bits as this can cause some metal shavings to stick inside the manifold. Start with a small pilot hole, and successively move up one drill bit size until 21/64" or the Type "R" (.339") is reached. This method will also keep the metal shavings as small as possible. The key to prevent the drill bit from seizing is ensuring the same angle of approach is used on each pass and starting slowly to ensure the bit is centered in the hole. If at anytime the drill bit feels like it is binding, back it out and start slowly again. This process can be tedious and may take several attempts with each drill bit, but it will also ensure that the metal shavings are blown out of the manifold. With the procedure outlined above we were comfortable performing this process with the engine running at idle vs. using a vacuum after each pass. Ensure safety glasses/goggles are worn because the metal shavings will be blown back towards the ground.
Once the hole is drilled the tapping process can begin. This procedure was also executed with the engine running at idle for the same reasons outlined while drilling. Using the tapping tool and 10" extension will aid in reaching and tapping the manifold. The extension also keeps the heat off the hands while the engine is running. Ensure the angle of approach is correct and slowly tap and back off (without completely taking the tap out of the hole) allowing the metal shavings to be blown out. This will also reduce the possibility of cross threading.
Once the tap is complete the truck can be shut off and the 18" NPT fitting (collar) can be installed. To install the fitting, turn it until it is finger tight then use a wrench to make one additional turn or until the hex nut is in a good location to secure the probe in the collar. The probe (sender) must be inserted halfway into the manifold for the most accurate readings. To determine the halfway mark, carefully insert the probe until it touches the other end of the manifold. Mark the location on the probe adjacent to the collar and determine the halfway mark ensuring to take into account the thickness of the NPT fitting (collar). Secure the probe in place using a 5/64" hex wrench.
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