TUBE AS 7T2166 - Caterpillar

Removal Procedure
Table 1
Required Tools    
Tool     Part Number     Part Description     Qty    
A     8T-3268     Unit Injector Removal Bolt     2    Start By:
Remove the valve mechanism group. Refer to Disassembly and Assembly, "Valve Mechanism - Remove".
Keep all parts clean from contaminants.Contaminants may cause rapid wear and shortened component life.
Personal injury or death can result from the engine starting.The engine can start and injure persons working on or near the engine.Be sure the engine cannot be started while service work is being performed. This is very important when the engine is equipped with an Automatic Start Stop System.On engines equipped with an air starting system, close the air supply valve to the air starting motor before service work is begun.
Note: Refer to Disassembly and Assembly, "General Information (Reference Material)" for more information.
Turn OFF the fuel supply to the engine.
Illustration 1 g00639535
Be sure to drain the fuel system in order to avoid the introduction of fuel into the cylinders or cause fuel to flow over the engine when the tubes are removed
Place a container under fuel pressure control valve (1) and remove one of the top plugs in order to drain the cylinder head of fuel that is on the unit injectors.
Illustration 2 g01298982
Disconnect fuel supply tube assembly (3) at the fuel supply manifold.
Introduce clean pressurized air that is regulated to 207 kPa (30 psi) into fuel return tube assembly (2) through fuel supply tube assembly (3). This is done in order to purge fuel from the cylinder head into the fuel return manifold.
Remove fuel supply tube assembly (3) and fuel return tube assembly (2). Plug or cap all of the openings.
Illustration 3 g01299010
Remove bolts (5) and unit injector clamp (4) .
Do not pry the unit injector with a heel bar because damage (bending) to the fuel rack can occur. This will make unit injector replacement necessary.
Install Tooling (A) in the fuel injector. Tighten Tooling (A) evenly in order to loosen the fuel injector in the bore.
Illustration 4 g00639538
Carefully remove fuel injector (6) from the cylinder head. Put identification on the fuel injector in order to identify the cylinder head.
Install a plastic plug in the fuel injector opening in the cylinder head.Note: Put a clean cover over the cylinder head in order to prevent the entry of airborne dust or abrasive particles into the engine.