ENGINE AR-CORE 3645724 - Caterpillar

Keep all parts clean from contaminants.Contaminants may cause rapid wear and shortened component life.
A change in the installation procedure of the Electronic Unit Injector has occurred in order to improve product reliability.Installation Procedure
Table 1
Required Tools    
Tool     Part Number     Part Description     Qty    
B     9U-6862     Tapered Brush     1    
9U-7237 Brush Extension     1    
C     9U-6863     Small Bore Brush     1    
9U-7237 Brush Extension     1    
D     8T-2998     Lubricant     1    
Keep all parts clean from contaminants.Contaminants may cause rapid wear and shortened component life.
Care must be taken to ensure that fluids are contained during performance of inspection, maintenance, testing, adjusting, and repair of the product. Be prepared to collect the fluid with suitable containers before opening any compartment or disassembling any component containing fluids.Refer to Special Publication, NENG2500, "Dealer Service Tool Catalog" for tools and supplies suitable to collect and contain fluids on Cat products.Dispose of all fluids according to local regulations and mandates.
Illustration 1 g01019375
Use Tooling (B) to clean injector seating (7) .
Use Tooling (C) to clean tip bore (8) .
Illustration 2 g01019370
Note: Do not reuse seals (9) and bolt (4). Use new seals and a new bolt (4) for installation.
Illustration 3 g01019336
Typical Example
Lubricate the bore lightly with a 50/50 mix of clean engine oil and Tooling (D) .Note: The injector code (10) will be used later if the injectors have been changed. Write down the injector code (10) which is located on the solenoid.
Illustration 4 g01019373
When a fuel injector group is serviced, the new fuel injector group's electronic injector code must be programmed into the engine's personality module software by using the calibration menu on the Electronic Service Tool. If the new fuel injector group's electronic code is not entered, the previous fuel injector group's characteristics are assumed.If it is not possible to immediately reprogram the electronic injector code of the injector into the personality module software, the engine will not be severely harmed. The new electronic injector code should be reprogrammed as quickly as possible in order to optimize engine performance.
Install the electronic unit injector (3) in the head assembly. Install the electronic unit injector in the same location on the head assembly. Place the hold-down clamp (6) at the base of the unit injector. Push down on the return spring of the unit injector in order to seat the unit injector.
Install spacer assembly (5) and bolt (4) that holds the unit injector in place.Note: In ALL instances, replace the electronic fuel injector hold-down bolt with a NEW bolt.
Pull the unit injector completely into the bore. Tighten the bolt to a torque of 55 10 N m (41 7 lb ft).
Install cap assembly on unit injector (3). Tighten nuts to a torque of 2.5 0.25 N m (22 2 lb in).
Install bridge assemblies (2) onto the valve stems in the head assembly. Install the bridge assemblies in the same location on the