Caterpillar — Fuel System - Prime (S/N X3B1-Up, XYC1-Up, XYD1-Up, N4R1-Up, N3X1-Up, N4X1-Up)
Maintenance
From a Caterpillar owner's manual covering: C3.3, C3.3 Rental Generator Set, C4.4, C4.4 Rental Generator Set, D4D1-Up, GLE1-Up, N3X1-UP, N4R1-Up, N4X1-Up, X3B1-UP, XYC1-Up, XYD1-Up. Check it applies to your exact model before use.
Applies to: Caterpillar C3.3, Caterpillar C4.4
Before you start
- Do not crank the engine continuously for more than 30 seconds
- Allow the starting motor to cool for two minutes before cranking again
Procedure
- Remove the cover for the fuel injectors.
- Turn the key switch to the RUN position for three minutes.
- Turn the key switch to the OFF position.
- Loosen the flare nuts (1) for the high pressure fuel lines on all fuel injectors.
- Operate the starting motor and crank the engine until the fuel is free of air.
- Tighten the flare nuts (1) to a torque of 30 N·m (22 lb ft).
- Operate the engine at low idle for a minimum of five minutes.
Specs & values
- Flare nut torque 30 N·m (22 lb ft)
Full service-parts list: Caterpillar C3.3 →, Caterpillar C4.4 →
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.