IDLER AS 3343353 - Caterpillar

Installation Procedure
Table 1
Required Tools    
Tool     Part Number     Part Description     Qty    
B     4C-5553     Injector Seat Cleaning Brush     1    
C     173-1530     Injector Seating Tool     1    
D     143-2099     Unit Injector Tool Group (Sleeve Replacement)     1    
Keep all parts clean from contaminants.Contaminants may cause rapid wear and shortened component life.
Inspect the unit injector sleeve for pitting and for carbon tracking. Used unit injector sleeves do not need to be reamed unless the seated area is pitted or eroded. If the seated area has excessive carbon deposits, the used unit injector sleeves need to be reamed. Refer to Tool Operating Manual, NEHS0675, "Using the 143-2099 Sleeve Replacement Tool Group on 3114, 3116, and 3126 Engines". Use Tooling (D) to ream injector sleeves.
Inspect the condition of the O-ring seals on the unit injector. Replace the seals, if necessary.
Lubricate the O-ring seals with clean engine oil.
Illustration 1 g00775441
Position the unit injector in the cylinder head and rotate the unit injector in order to engage injector rack bar (3) with fuel injection control linkage (2) . Push down on the unit injector and ensure that the unit injector is properly seated in the cylinder head.Note: Do not use fuel injector hold-down bolt (1) to pull the unit injector into the cylinder head.
Install a new fuel injector hold-down bolt (1) in the hold-down bracket for the unit injector. Tighten fuel injector hold-down bolt (1) to a torque of 12 3 N m (106 27 lb in).Note: Do not overtighten fuel injector hold-down bolt (1) . Excessive torque may cause damage to the unit injector and the unit injector may seize.
Refer to the Tool Operating Manual, NEHS0738, "Using the 173-1530 Injector Seating Tool Group on 3114, 3116, and 3126 MUI or 3126 HEUI 2-Valve Engines" for the remaining steps on installing the unit injector.
Synchronize the unit injectors. Refer to Testing and Adjusting, "Unit Injector Synchronization - Adjust".End By: Install the rocker shaft and the pushrods. Refer to Disassembly and Assembly, "Rocker Shaft and Pushrod - Install".