Caterpillar 3456 Generator Set C4G / 3456 Generator Set Engine — The Engine Has Been Rebuilt
Maintenance · Fuel system
For the Caterpillar 3456 Generator Set C4G / 3456 Generator Set Engine, from the Caterpillar service manual.
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Before you start
- Do not allow dirt to enter the fuel system. Thoroughly clean the area around a fuel system component that will be disconnected. Fit a suitable cover over disconnected fuel system component.
- Do not crank the engine continuously for more than 30 seconds. Allow the starting motor to cool for two minutes before cranking the engine again.
- Failure to tighten all fittings could result in serious fuel leaks.
Procedure
- Turn the ECS to the "OFF" position.
- Fill the fuel tank(s) with clean diesel fuel.
- Open the air purge screw (1) for the fuel filter by three full turns. Do not remove the air purge screw.
- Open fuel pressure regulating valve (2) by two and a half turns; it is located in the integral fuel filter base. Do not remove the valve completely.
- Crank the engine for 30 seconds, catching the fuel in a suitable container; allow the starter motor to cool for two minutes.
- Crank the engine for 30 seconds. Allow the starter motor to cool for two minutes.
- Close and tighten air purge screw (1).
- Crank the engine for 30 seconds. Allow the starter motor to cool for two minutes.
- Close and tighten fuel pressure regulating valve (2).
- Crank the engine for 30 seconds. Allow the starter motor to cool for two minutes.
- Repeat Step 10 until the engine starts and runs.
- Clean any residual fuel from the engine components.
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Air purge screw (1): open three full turns
- Fuel pressure regulating valve (2): open two and a half turns
- Crank engine no more than 30 seconds continuously
- Allow starter motor to cool two minutes before cranking again
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.