GAC QST30 Conversion — Installing K-Type Exhaust Gas Temperature Thermocouples
For the GAC QST30 Conversion.
Applies to: GAC QST30 Conversion
Before you start
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Procedure
- Locate the exhaust temperature probe in the engine exhaust outlet as near as possible to the point where all of the cylinders merge. If the exhaust outlet is not easily accessible, place the sensor in the manifold outlet pipe.
- Determine placement location for the thermocouple in each exhaust using the thermocouple dimensions to determine mounting location and manufacturer's information. Route the wires away from any ignition components.
- Mark weld-in bung placement.
- Drill and weld the steel 1/4 inch NPT weld bung fitting.
- Dry fit the sensor into the bung. Ensure the tip of the probe is within the outlet exhaust flow. Use caution with the tip.
- Apply anti-seize compound to the compression fitting threads and NPT threads.
- Mount the sensor using the 1/4 inch NPT fitting.
- Tighten compression fitting and sensor finger tight. Turn the sensor 2 full turns past finger tight.
- Connect the sensor, ensuring the connector protection boot is in place.
Tools required
- Drill
- Welder
Specs & torque values
- Type K Thermocouple temperature rating: 1200 degF (650 degC)
- Compression fitting: 1/4 inch NPT
- Weld-in bung: 1/4 inch NPT
- Thermocouple sensor torque: 2 full turns past finger tight
Source: manual:175 Series QST30-Conversion-Solution-A5-1.pdf. Figures and steps are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.