2009/07/01 Caterpillar

Engine:

3406E (S/N: 5EK1-UP)

3406E (S/N: 1MM1-UP)

3406E (S/N: 2WS1-UP)

3406E (S/N: 6TS1-UP; 1LW1-UP)

C-15 (S/N: 6NZ1-UP; 9NZ1-UP)

C-16 (S/N: 7CZ1-UP)

Truck Engine News SEBD6825, July 2009, "3406E and C-15 Low Idle Instability ". Disregard this article. Refer to the article that follows.

Remanufactured Injectors that are used in the engines that are listed above experienced rough low idle. The rough low idle was caused by incorrect valve opening pressure. Incorrect valve opening pressure caused the injector to deliver the fuel too late in the power stroke. The engine runs rough under the following conditions:

• The engine has reached operating temperature.

• Idling between 700 and 1000 rpm

• No load condition

Refer to Table 1 in order to determine the injectors that are affected.

Table 1

Part Numbers for the Fuel Injectors
10R-2780	Fuel Injector Gp
10R-2781	Fuel Injector Gp
10R-0957	Fuel Injector Gp
10R-0958	Fuel Injector Gp

Not all injectors below the serial number break in Table 2 have exhibited low idle instability. Many of the injectors that were built before the serial number break work properly.

Table 2

Serial Numbers for the Injectors
Injector Serial Number	Part Number of the Injector
1194092	10R-0957 Fuel Injector Gp
1196730	10R-0958 Fuel Injector Gp

The Dealer Solution Network (DSN) can be contacted in order to help identify the problem. Only replace a faulty injector with a new injector that has a serial number which is higher than the serial numbers that are listed in Table 2.

Note: Injectors that pass Caterpillar performance tests will be returned to the dealer if the injectors were replaced without consulting the factory or the DSN.