Caterpillar 3406 — Remove and Install Fuel Injector
Repair & overhaul · Fuel Injector Nozzles
For the Caterpillar 3406, from the Caterpillar operator's manual.
Applies to: Caterpillar 3406
Before you start
- Do not overtighten. Use a torque wrench. Overtightening or undertightening can cause fuel nozzle and engine failures.
Procedure
- Clean dirt from around valve cover and remove the cover.
- Disconnect the clip and lead wire from the glow plug.
- Remove the fuel injection line at the valve housing. Immediately install plugs in the fuel line nuts to prevent dirt from entering the fuel injection line.
- Remove the valve retainer nut, and nozzle assembly.
- To install: screw the valve body into the nozzle assembly.
- Insert the nozzle assembly and valve body, as a unit, into the precombustion chamber.
- Install the retainer nut and tighten to 55 lb. ft (71 N-m).
- Connect the fuel injection line and tighten. Install clip and lead wire to the glow plug.
- Install the valve cover.
Tools required
- torque wrench Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Install the retainer nut and tighten to 55 lb. ft (71 N-m).
Full service-parts list: Caterpillar 3406 →
Source: Caterpillar operator's 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.