Caterpillar 3412C — Fuel System - Prime
Maintenance
For the Caterpillar 3412C, from the Caterpillar owner's manual.
Applies to: Caterpillar 3412C, Caterpillar 3412C engine
Before you start
- Fuel leaked onto hot surfaces can cause a fire
Procedure
- Unlock priming pump; operate until resistance is felt.
- Push in plunger and hand tighten.
- Crank engine; if rough, run at low idle until smooth.
- Open vent valve on fuel injection pump housing (if equipped).
- Operate priming pump until fuel flow is free of air bubbles.
- Close vent valve, push in plunger, hand tighten.
- Loosen fuel line nuts at valve cover base one at a time.
- Tighten fuel line nuts to 40 ± 7 N·m (30 ± 5 lb ft).
Specs & values
- Fuel line nut torque 40 ± 7 N·m (30 ± 5 lb ft)
Full service-parts list: Caterpillar 3412C →, Caterpillar 3412C engine →
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.