Caterpillar 3406E — Electronic Unit Injector - Install
Repair & overhaul
For the Caterpillar 3406E, from the Caterpillar service manual.
Applies to: Caterpillar 3406E
Before you start
- Do not reuse O-ring seals. New O-ring seals must be used.
- Do not reuse the injector hold down bolts. New injector hold down bolts must be used.
- The new fuel injector group's electronic injector code must be programmed into the engine's personality module software using the calibration menu on the Electronic Service Tool.
Procedure
- Use Tooling (B) and (D) to clean electronic unit injector seat (8).
- Use Tooling (C) and (D) to clean electronic unit injector bore (9).
- Install O-ring seals (7). Lubricate the top two with a 50/50 mixture of clean engine oil and Tooling (E).
- Write down injector code (10) located on the solenoid.
- Install electronic unit injector (2) into the original location in the cylinder head.
- Install clamp (6) and spacer (5).
- Install bolt (4) and tighten: 50 ± 10 N·m, loosen by hand, tighten again to 50 ± 10 N·m.
- Install bridge assemblies (3) in the respective locations.
- Connect harness assembly (1) and tighten nuts to 2.5 ± 0.25 N·m.
- Install the rocker arms and the rocker arm shaft.
- Adjust the height of the electronic unit injector.
- Calibrate the electronic unit injector using Cat ET injector codes calibration.
Tools required
- 9U-6862 Tapered Brush Amazon
- 9U-6863 Small Bore Brush Amazon
- 9U-7237 Brush Extension Amazon
- BT-2998 Lubricant Amazon
- Cat ET Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Injector hold down bolt: 50 ± 10 N·m (37 ± 7 lb ft)
- Harness nuts: 2.5 ± 0.25 N·m (22 ± 2 lb in)
Full service-parts list: Caterpillar 3406E →
Source: Caterpillar service manual. Steps and values are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.