Caterpillar Viton O-Ring, PAI 321251 (OEM 617539), Pack of 10
Used In These Kits
This part is included in 10 engine & overhaul kits — find yours below.
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132083-100O-RING GASKET KIT In stock -
331237Cat / Caterpillar 3400 SERIES UPPER GASKET KIT In stock -
331239Cat / Caterpillar 3400 SERIES UPPER GASKET KIT In stock -
331240Cat / Caterpillar 3400 SERIES UPPER GASKET KIT In stock -
331500Cat / Caterpillar C13 ENGINE FUEL GASKET KIT In stock -
331545Caterpillar C11 Fuel Gaksket Kit In stock -
331561Cat / Caterpillar 3176 SERIES UPPER GASKET KIT In stock -
331562Caterpillar 3176 Lower Gasket Set In stock -
331627Caterpillar 3176 / 3176C Central/Lower Gasket Set In stock -
831139Mack LOWER GASKET SET In stock - No kits match that search.
Suggested Additional Parts
Commonly sold with this product. These parts are sold separately.
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331214Cat Turbo Oil Drain Gasket, PAI (OEM 126-2702), Pack of 5 In stock -
321249Caterpillar Viton O-Ring, PAI (OEM 6J2245), Pack of 10 In stock -
331213Cat / Caterpillar TURBOCHARGER OIL PRESSURE GASKET (Pack of 5) In stock -
431209Cat / Caterpillar TURBOCHARGER OIL DRAIN GASKET (Pack of 6) In stock -
331276Cat Oil Feed Gasket, PAI (OEM 197-8418), Pack of 6 In stock
| Brand | PAI Industries |
| Part Category | Seals & O-Rings |
| Sub-Type | O-Ring |
| Engine Make | Caterpillar |
| Engine Model | 3406E · C15 · C16 · C18 · 3400 |
| Condition | New |
| Stage / Tier | Standard |
PAI 321251 is a viton o-ring for Caterpillar applications. PAI specifies Viton construction. The manufacturer designates product-level OEM 617539. PAI cross-references Caterpillar 617539. PAI lists these application categories: Caterpillar 3406E Series, Caterpillar C15 Engine, Caterpillar C16 Engines, Caterpillar C18 Engine, Caterpillar 3400 Series. Confirm the complete required part number before ordering.
Pack of 10.
Manufacturer product cross-references
Caterpillar 061-7539
Caterpillar 0617539
Caterpillar 61-7539
Cummins 4965731
Mack 993664
Navistar 1815561
Navistar 1815561C1
PAI Part #: 321251
OEM References:
- CATERPILLAR 061-7539
- CATERPILLAR 0617539
- CATERPILLAR 61-7539
- CATERPILLAR 617539
- CUMMINS 4965731
- MACK 993664
- NAVISTAR 1815561
- NAVISTAR 1815561C1
Applications:
- CATERPILLAR 3406E SERIES
- CATERPILLAR C15 ENGINE
- CATERPILLAR C16 ENGINES
- CATERPILLAR C18 ENGINE
- CATERPILLAR 3400 SERIES
Warranty: 2.0 year(s)
These catalog references may identify this part or components in an assembly. A listed number alone does not confirm whole-assembly interchange or vehicle fitment. Confirm the required part before ordering.
| Number |
|---|
| 061-7539 |
| 0617539 |
| 61-7539 |
| 617539 |
| 4965731 |
| 993664 |
| 1815561 |
| 1815561C1 |
| CATERPILLAR 061-7539 |
| CATERPILLAR 0617539 |
| CATERPILLAR 61-7539 |
| CATERPILLAR 617539 |
| CUMMINS 4965731 |
| MACK 993664 |
| NAVISTAR 1815561 |
| NAVISTAR 1815561C1 |
| PAI 321251 |
No cross-reference numbers match that search.
Discovery models are listed below. Confirm the complete application and any ESN/CPL or size restrictions before ordering.
Most PAI parts carry a 2-year unlimited-mileage PAI warranty — 3 years on the High Performance tier, 1 year on Excel by PAI. See Warranty & Returns for full coverage terms, or call a specialist to confirm the exact coverage on this part.
PAI published warranty tiers: High Performance — 3-Year · Genuine PAI — 2-Year · Excel — 1-Year, unlimited mileage. The badge beside the price shows this product's recorded term; when no badge is shown, confirm coverage with a specialist.















