Caterpillar — Fuel Injector - Inspect/Adjust
Adjustments · Electronic unit injectors
From a Caterpillar owner's manual covering: 3406E, C15, SEBU7005-08. Check it applies to your exact model before use.
Applies to: Caterpillar 3406E, Caterpillar C15
Before you start
- Only qualified service personnel should perform valve lash maintenance.
Procedure
- Inspect the injector mechanism for signs of wear.
- Put the No. 1 piston at the top center position on the compression stroke.
- Use the 9U-7227 Injector Height Gauge to obtain 78.0 ± 0.2 mm (3.07 ± 0.01 inch) from top of unit injector to machined ledge of fuel injector body.
- Turn unit injector adjustment screw clockwise until the correct height is obtained.
- Hold adjustment screw and tighten locknut to 100 ± 10 N·m (75 ± 7 lb ft).
- For cylinders 1, 2, 3, 7, 8, and 10 remove the timing bolt; turn flywheel 360 degrees counterclockwise (viewed from flywheel end) to put No. 11 piston at top center.
- Repeat adjustment steps 3 through 4.
- Remove timing bolt from flywheel; reinstall valve mechanism covers.
Tools required
- 9U-7227 Injector Height Gauge Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Injector height: 78.0 ± 0.2 mm (3.07 ± 0.01 inch)
- Locknut torque: 100 ± 10 N·m (75 ± 7 lb ft)
Full service-parts list: Caterpillar 3406E →, Caterpillar C15 →
Source: Caterpillar owner'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.