COVER 1014197 - Caterpillar

Setting the Timing of the Digital Ignition System
Illustration 1 g00761355
Front view and side view of the timing control (1) "TIMING SWITCH" (2) "APPLICATION SWITCH"The timing control has a "TIMING SWITCH" (1) and an "APPLICATION SWITCH" (2) . The "APPLICATION SWITCH" must be set to the engine model that is controlled. The switch must also be set to the timing range that is appropriate for the fuel that is consumed. The "TIMING SWITCH" is used to fine tune the ignition timing. Use the following procedure to set the ignition timing.
Determine the correct ignition timing for the fuel.
Obtain a fuel analysis.
Enter the data from the fuel analysis into the Caterpillar Software Program, LEKQ6378, "Methane Number Program".
Refer to Engine Performance, LEBQ6483, "G3400 Generator Set", "Fuel Usage Guide" or consult with your Caterpillar dealer in order to determine the desired ignition timing.
Do not change the setting of the "APPLICATION" switch during engine operation. An engine shutdown can occur and/or the engine can be damaged.Always shut the engine OFF before you change the setting of the "APPLICATION" switch.
Use the label for the "APPLICATION SWITCH" to choose the correct position for the switch. Set the switch at the lowest possible range for the desired timing.Table 2 is an example of the settings that are listed on the label for the "APPLICATION SWITCH".
Table 1
Example Settings of the Application Switch    
A = G3412     10 to 25 degrees BTC    
B = G3306/ G3406     10 to 25 degrees BTC    
C = G3408     10 to 25 degrees BTC    
D = G3412     20 to 35 degrees BTC    
E = G3306/ G3406     20 to 35 degrees BTC    
F = G3408     20 to 35 degrees BTC    Recommendations for setting the "APPLICATION SWITCH" ( G3406 Engines)For G3406 Engines, the "APPLICATION SWITCH" must be set to "B" or "E".For a G3406 Engine with a desired ignition timing of 19 degrees BTC or less,