SEAL-RING 4M2621 - Caterpillar

Removal Procedure
Hot engine components can cause injury from burns. Before performing maintenance on the engine, allow the engine and the components to cool.
Wear goggles, gloves, protective clothing, and a National Institute for Occupational Safety and Health (NIOSH) approved P95 or N95 half-face respirator when handling a used Diesel Particulate Filter or Catalytic Converter Muffler. Failure to do so could result in personal injury.
Remove the heat shielding.
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Remove bolts (1) and plate (2).
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Disconnect wiring harness (3) and position the harness out of the way.
Remove pressure sensor (4).Installation Procedure
Install pressure sensor (4) in the reverse order of removal.
Tighten pressure sensor (4) to a torque of 10 2 N m (89 18 lb in).