RETAINER 9Y1800 - Caterpillar

Injector synchronization is the setting of all fuel injector racks to a reference position so that each injector gives the same amount of fuel to each cylinder. This is done by setting each fuel injector rack to the same position while the control linkage is in a fixed position.Always synchronize an injector after the injector has been removed, replaced, or reused. If the No. 1 injector is reused or replaced, synchronization of all injectors must be checked and adjusted.This entire procedure should be read and understood before you begin any work on the engine.Note: The procedure that is described in this article is a new procedure that does not involve the use of gauge blocks in order to adjust the unit injector synchronization. The earlier procedure that utilizes the gauge blocks may still be used. However, the new procedure will provide the most accurate results.Note: The following list includes additional parts that need to be supplied in order to perform the new procedure: 9U-7282 Indicator Fixture Group, 8T-4177 Bolt, 9U-7263 Indicator Contact Point and 1U-8869 Dial Indicator .Refer to Table 1 for the tools that are required to check or adjust the unit injector synchronization. Many of the tools that are required can be found in the 223-2454 Fuel System and Governor Tool Gp.
Table 1
Required Tools (1)    
Tool     Part Number     Description     QTY    
A     128-8823     Long Nose Pliers     1    
B     9U-7282     Indicator Fixture Group     2    
C     8T-4177     Bolt     2    
D     9U-7263     Indicator Contact Point     2    
E     1U-8869     Dial Indicator (Digital)     2    
F     1U-6673     Wrench (Fuel Ratio Control)     1    
( 1 ) Actual tooling may vary depending on the individual engine arrangement.The following procedure may be used to synchronize the unit injectors and the following procedure may be used to adjust the unit injectors.
Stop the engine and turn the electrical system to the OFF position.
Remove the fuel shutoff solenoid.Note: If the fuel shutoff solenoid is inaccessible, the following steps may be followed.
Turn the engine start switch to the ON position. Briefly engage the starter. Do not start the engine. Return the engine start switch to the ON position. Do not turn the engine start switch to the OFF position.
Turn the battery disconnect switch to the OFF position or disconnect the negative terminal of the battery. This will leave the fuel shutoff solenoid in the OPEN position.
Remove the valve cover.
Illustration 1 g00998517
Remove bolts (1) that attach the valve mechanism cover base.
Illustration 2 g00998519
Attach Tooling (A) to the rail for the fuel (2) .
Illustration 3 g00998587
Install Tooling