IDLER ASSEM. 9S7221 - Caterpillar

Excessive ether (starting fluid) can cause piston and ring damage. Use ether for cold weather starting purposes only.
Ether can be automatically injected during cranking by the Electronic Control Module (ECM).The switch input (if equipped) enables the operator to inject ether manually under the following conditions:
The ether control parameter is programmed to "ON".
The momentary contact switch for the ether injection is activated.
The engine speed is more than a threshold.
The jacket water coolant temperature is less than a threshold.The ECM automatically injects ether into the air inlet manifold when the following conditions are met:
The ether control parameter is programmed to "ON".
The engine rpm is between 75 and 400 rpm.
The jacket water coolant temperature is below a threshold.For troubleshooting, an override is available for the technician to actuate the ether system. By using Cat® Electronic Technician (ET), ether injection can be started and stopped.