LINES GP-FUEL INJECTION 8N2461 - Caterpillar

sealing probe adapters are designed to be used in situations that require the temperature of a captive fluid (gas or liquid) to be measured without stopping the machine or draining the system. The self sealing probe adapters are available in three configurations: 5P2720-1/8"-27NPT, 5P2725-1/4"-18 NPT and 5P3591-9/16" straight thread with O-ring seal.
The probe adapters are to be used with 1/8" diameter probes only. Some earlier probes had a 3/16" diameter shoulder near the thread area. These probes should not be installed into a probe adapter. The probe adapters are designed to be used at a temperature NOT to exceed 130°C (266°F) and at a pressure NOT to exceed 3100 kPa (450 psi). The probe MUST be clean, smooth and lubricated with a petroleum jelly prior to being inserted into the probe adapter. It is not generally necessary to tighten the probe with a wrench. However, if a wrench is used, tighten only enough to hold the probe in place. The seal takes place within the adapter not at the probe threads.
To help ensure that the self sealing probe adapter seals when a probe is being installed or removed, use the following procedure.
Installation Of Self-Sealing Probe Adapter
1. The earlier probe adapter had flats on the seal retainer. The current seal retainer does NOT have flats on it. The flats were removed to help prevent accidental removal of the seal retainer. The seal retainer is installed during assembly with a thread lock material and tightened to a specific torque. Prior to installation, check probe adapters for a loose seal retainer by removing the plug. The