Caterpillar 3412C Engine Engine

Fault codes

Fault codes and symptom→remedy steps extracted from this engine’s service/owner documentation; verify against the official manual before servicing.

• Increased coolant temperature null
• Fault shutdown 21
• Fault alarm 22
• Engine overspeed i01226491
  Fix: Stop the engine by shutting off the fuel supply to the engine and/or shutting off the air supply to the engine.
• Smoke emission
  Fix: Each fuel injection nozzle must be isolated one at a time in order to determine the malfunctioning fuel injection nozzle. 1. Start the engine. 2. Loosen each fuel line nut one at a time at the fuel injection pump. A cloth or similar material must be used in order to prevent fuel from spraying on the hot exhaust components. Tighten each nut before loosening the next nut. 3. A defective fuel injection nozzle may be identified when a fuel line nut is loosened and the following conditions are present: • The exhaust smoke is partially eliminated or the exhaust smoke is completely eliminated. • Engine performance is not affected. A fuel injection nozzle that is suspected of being defective should be removed. A new fuel injection nozzle should be installed in the cylinder
• Engine knock
  Fix: Each fuel injection nozzle must be isolated one at a time in order to determine the malfunctioning fuel injection nozzle. 1. Start the engine. 2. Loosen each fuel line nut one at a time at the fuel injection pump. A cloth or similar material must be used in order to prevent fuel from spraying on the hot exhaust components. Tighten each nut before loosening the next nut. 3. A defective fuel injection nozzle may be identified when a fuel line nut is loosened and the following conditions are present: • The exhaust smoke is partially eliminated or the exhaust smoke is completely eliminated. • Engine performance is not affected. A fuel injection nozzle that is suspected of being defective should be removed. A new fuel injection nozzle should be installed in the cylinder
• Abnormal engine operation
  Fix: Each fuel injection nozzle must be isolated one at a time in order to determine the malfunctioning fuel injection nozzle. 1. Start the engine. 2. Loosen each fuel line nut one at a time at the fuel injection pump. A cloth or similar material must be used in order to prevent fuel from spraying on the hot exhaust components. Tighten each nut before loosening the next nut. 3. A defective fuel injection nozzle may be identified when a fuel line nut is loosened and the following conditions are present: • The exhaust smoke is partially eliminated or the exhaust smoke is completely eliminated. • Engine performance is not affected. A fuel injection nozzle that is suspected of being defective should be removed. A new fuel injection nozzle should be installed in the cylinder

Compiled from service & troubleshooting documentation across every generator set that uses the Caterpillar 3412C.

Pooled from every document that names this exact engine — confirm the interval and part number against your unit's serial number.

Parts listed by aftermarket suppliers as fitting this engine — leads compiled from supplier catalogs; verify the exact part for your serial number.

• Air filter: Caterpillar 612506 Donaldson P532506 Wix 46589 Ac Delco A1586C
• Fuel filter (primary): Caterpillar 3089679 Donaldson P551311 Wix 33674NP
• Fuel filter (secondary): Caterpillar 3089679 Donaldson P551311 Wix 33674NP
• Oil filter: Caterpillar 2P4005 Donaldson P554005 Wix 51792 Ac Delco PF879L

Cross-referenced via Donaldson + OEM/engine-maker interchange — options to verify against your serial number, not confirmed for every exact variant.

• Caterpillar 657E — Scraper
• Caterpillar 992C — Loader Wheeled
• Caterpillar 992D — Loader Wheeled
• Caterpillar D10N — Tractor Tracked
• Caterpillar D9L — Tractor Tracked
• Manitowoc 4599 SERIES 4 — Dragline

Other equipment known to use this engine, via filter-application cross-reference — useful for sourcing parts even when your exact machine isn't listed elsewhere on this page.