Some of the Delphi, Bosch, and Stanadyne fuel injection pumps have a cold start advance unit. The cold start advance unit holds the timing of the fuel injection pump in an advanced position when the engine is cold.
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It is important that the electrical connections to the sender unit are connected correctly. If the cold start advance unit fails to operate correctly, engine damage may result because the engine timing will be fully advanced for normal engine operation. |
The cold start advance unit is on the rear of the timing case on the left side of the engine.
The cold start advance unit on the Delphi and the Bosch fuel injection pumps operate in a similar manner. As the engine begins to reach normal operating temperature, the cold start advance unit energizes. By energizing, the fuel injection pump timing is retarded to the correct timing for normal operation.
The cold start advance unit on the Stanadyne fuel injection pump operates differently. As the engine begins to reach normal operating temperature, the cold start advance unit will de-energize. By de-energizing, the fuel injection pump timing is retarded to the correct timing for normal operation.
Serviceable replacement parts are available for the cold start advance units on Stanadyne fuel injection pumps. These replaceable parts allow the cold start advance unit to be repaired without removing the fuel injection pump from the engine. Only Type 2 engines and 7BJ engines with Stanadyne fuel injection pumps have this feature. Refer to your Caterpillar Dealer for information of the fuel injection pumps with this advantage.
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Damage to the engine will occur if the engine is load tested at more than 80 percent of full load with the cold start advance unit disconnected. |
Delphi DP200 Fuel Injection Pump
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| Illustration 1 | g00523697 |
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Delphi DP200 fuel injection pump (1) Engine stop solenoid (2) 3 Amp wire (3) Sending unit (4) 3 Amp wire (5) 6 Amp wire (6) Fuel injection pump (7) Cold start advance unit (8) Start switch | |
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| Illustration 2 | g00523698 |
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Bosch fuel injection pump (1) Fuel injection pump (2) 3 Amp wire (3) Engine stop solenoid (4) Sending unit (5) 3 Amp wire (6) Cold start advance unit (7) 6 Amp wire (8) Start switch | |
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| Illustration 3 | g00523699 |
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Stanadyne fuel injection pump (1) Engine stop solenoid (2) 3 Amp wire (3) 6 Amp wire (4) Fuel injection pump (5) Cold start advance unit (6) 3 Amp wire (7) Sending unit (8) Start switch | |