C18 Marine Engines Caterpillar

Removal Procedure

Note: M.C.S. regulated engines are equipped with thermowells which allow specific temperature sensors to be removed while the engine remains in operation. A heat conductive compound is used to ensure that an accurate temperature reading is achieved by the temperature sensor when installed in a thermowell.

Note: For the engines not equipped with a thermowell, drain the coolant level until the coolant is below the sensor. Refer to Operation and Maintenance Manual, "Cooling System Coolant (ELC) - Change" for the correct draining and filling procedures.

Show/hide table

Illustration 1	g06213626
Typical Example

1. Disconnect harness assembly (2) and remove coolant temperature sensor (1). Use a clean towel to remove the heat transfer compound from coolant temperature sensor (1).

2. Remove the O-ring seal from coolant temperature sensor (1).

Installation Procedure

1. Install coolant temperature sensor (1) in the reverse order of removal.

   1. For the engines equipped with a thermowell, apply 1.7 mL (0.06 oz) of Tooling (A) to inside of thermowell. This will result in the cavity being 50% full. It is important that the cavity is not overfull, to avoid hydraulic lock.

   2. Tighten coolant temperature sensor (1) to a torque of 20 ± 3 N·m (177 ± 27 lb in).