Caterpillar 3456 ATAAC Engine
The Caterpillar 3456 ATAAC is a 15.8 L air-to-air aftercooled engine rated at 1800 rpm. It powers generator sets from Caterpillar, including the XQ 500.
Also known as: CAT 3456 ATAAC
Part of the Caterpillar 3456 engine family — 2 variants share parts & fitment.
Service parts for the 3456 ATAAC
The cheapest captured merchant offer per filter — see the full cross-reference below for every OEM/aftermarket option.
Prices captured from merchant listings; some links are affiliate links. Verify against your serial number before ordering.
Engine specifications
| Displacement | 15.8 L |
|---|
| Aspiration | Air-to-Air Aftercooled |
|---|
| Rated speed | 1800 rpm |
|---|
Maintenance schedule
| Item | Spec | Capacity | Part # | Interval | |
|---|
| Air filter | Air Inlet System | | 1063973 | 5000 hr | Amazon eBay $79.98 eBay $39.31 NAPA $116.29 FridayParts $62.16 |
| Fuel filter | | | — | 1200 hr | |
| Oil filter | | | — | 1200 hr | |
| Battery | Battery set with disconnect switch, 5 amp battery charger, 24 volt starting motor, heavy duty 45 amp charging alternator | | — | 1200 hr | |
| Belt | | | — | 1200 hr | |
| Coolant | | 74.2 l (qts.) | — | | |
| Oil | | 38.0 l (qts.) | — | | |
| Spark plug | | | — | 1200 hr | |
Pooled from every document that names this exact engine — confirm the interval and part number against your unit's serial number.
Recommended fluids
| Fluid | Grade | Standard | Ambient | Capacity | Notes |
|---|
| Fuel | | ultra low sulfur diesel (ULSD) | | | Required for Tier 4 Interim emissions compliance |
Extracted from the manufacturer documentation linked to this model. Values are copied as printed; confirm against your unit's manual and serial number.
Parts cataloged across the Caterpillar 3456 family
4| Part # | Description | Category |
|---|
| 1973688 | AIR CLEANER GP - A | Air filter |
| ACLRD01 | AIR CLEANER - REGULAR DUTY | Air filter |
| DK0707 | CLEANER GP-AIR SNGL ELEMENT | Air filter |
| 1195148 | COOLANT-LONG LIFE-BULK-1 LITER | Fluid |
Parts cataloged across all variants of this engine family — verify the exact part fits your specific variant and serial number before ordering.
Filters for this engine
- Air filter: Caterpillar 1063973 Donaldson P533884 Wix 46747 Baldwin RS3701
- Fuel filter: Caterpillar 1165436 Caterpillar 5134490 Donaldson P550625 Donaldson P551858 Wix 33640 Baldwin BF7753 Wix 33780 Baldwin BF1265
- Oil filter: Caterpillar 3890434 Caterpillar 2P4005 Donaldson P551808 Donaldson P554005 Wix 57792 Baldwin B7299 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.
Also used in
4- Caterpillar 385B — Excavator Tracked
- Caterpillar 385BL — Excavator Tracked
- Caterpillar 5090B — Excavator Tracked
- Caterpillar 836G — Compactor
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.
Common questions
What is the displacement of the Caterpillar 3456 ATAAC?
The Caterpillar 3456 ATAAC has a displacement of 15.8 liters.
Which generators use the Caterpillar 3456 ATAAC engine?
The Caterpillar 3456 ATAAC powers 1 generator set(s), including Caterpillar XQ 500.
What oil filter does the Caterpillar 3456 ATAAC use?
The Caterpillar 3456 ATAAC uses oil filter part numbers Caterpillar 3890434, Caterpillar 2P4005, Donaldson P551808.
What fuel filter does the Caterpillar 3456 ATAAC use?
The Caterpillar 3456 ATAAC uses fuel filter part numbers Caterpillar 1165436, Caterpillar 5134490, Donaldson P550625.
What air filter does the Caterpillar 3456 ATAAC use?
The Caterpillar 3456 ATAAC uses air filter part numbers Caterpillar 1063973, Donaldson P533884, Wix 46747.