Caterpillar Buna N O-Ring, PAI 321243 (OEM 6V8397), Pack of 5
Used In These Kits
This part is included in 14 engine & overhaul kits — find yours below.
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331144Caterpillar Overhaul Gasket Kit In stock -
331220Caterpillar 3100 / C7 / 3116 Engine Overhaul Gasket Kit In stock -
331325Cat / Caterpillar TURBOCHARGER INSTALLATION GASKET KIT In stock -
331327Caterpillar 3100 / C7 / 3116 Fuel Pump Gasket Kit In stock -
331328Cat / Caterpillar UPPER GASKET KIT In stock -
331429Cat / Caterpillar INSTALLATION GASKET KIT In stock -
331503Cat / Caterpillar UPPER GASKET KIT In stock -
331504Cat / Caterpillar C7 ENGINE UPPER GASKET KIT In stock -
331513Cat / Caterpillar TURBOCHARGER INSTALLATION GASKET KIT In stock -
331514Cat / Caterpillar OIL COOLER GASKET KIT In stock -
331515Cat / Caterpillar FRONT COVER GASKET KIT In stock -
331581Cat / Caterpillar UPPER GASKET SET In stock - 331670OIL COOLER GASKET SET View ›
- 801111IDLER PULLEY View ›
- No kits match that search.
Suggested Additional Parts
Commonly sold with this product. These parts are sold separately.
| Brand | PAI Industries |
| Part Category | Seals & O-Rings |
| Sub-Type | O-Ring |
| Engine Make | Caterpillar |
| Engine Model | 3100 · C7 |
| Condition | New |
| Stage / Tier | Standard |
PAI 321243 is a buna n o-ring for Caterpillar applications. PAI specifies Buna N construction. The manufacturer designates product-level OEM 6V8397. PAI cross-references Caterpillar 6V8397. PAI lists these application categories: Caterpillar 3100 Series, Caterpillar C7 Engine. Confirm the complete required part number before ordering.
Pack of 5.
Manufacturer product cross-references
Caterpillar 199-1901
Caterpillar 1991901
Caterpillar 5W4864
Caterpillar 77-3371
Caterpillar 773371
Caterpillar 81-4024
Caterpillar 814024
Caterpillar 8T4057
Caterpillar 8U1671
Caterpillar 96-5963
Caterpillar 965963
Caterpillar 98-2638
Caterpillar 982638
Caterpillar 1616154
Caterpillar 161-6154
PAI Part #: 321243
OEM References:
- CATERPILLAR 199-1901
- CATERPILLAR 1991901
- CATERPILLAR 5W4864
- CATERPILLAR 6V8397
- CATERPILLAR 77-3371
- CATERPILLAR 773371
- CATERPILLAR 81-4024
- CATERPILLAR 814024
- CATERPILLAR 8T4057
- CATERPILLAR 8U1671
- CATERPILLAR 96-5963
- CATERPILLAR 965963
- CATERPILLAR 98-2638
- CATERPILLAR 982638
- CATERPILLAR 1616154
- CATERPILLAR 161-6154
Applications:
- CATERPILLAR 3100 SERIES
- CATERPILLAR C7 ENGINE
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 |
|---|
| 199-1901 |
| 1991901 |
| 5W4864 |
| 6V8397 |
| 77-3371 |
| 773371 |
| 81-4024 |
| 814024 |
| 8T4057 |
| 8U1671 |
| 96-5963 |
| 965963 |
| 98-2638 |
| 982638 |
| 1616154 |
| 161-6154 |
| CATERPILLAR 199-1901 |
| CATERPILLAR 1991901 |
| CATERPILLAR 5W4864 |
| CATERPILLAR 6V8397 |
| CATERPILLAR 77-3371 |
| CATERPILLAR 773371 |
| CATERPILLAR 81-4024 |
| CATERPILLAR 814024 |
| CATERPILLAR 8T4057 |
| CATERPILLAR 8U1671 |
| CATERPILLAR 96-5963 |
| CATERPILLAR 965963 |
| CATERPILLAR 98-2638 |
| CATERPILLAR 982638 |
| CATERPILLAR 1616154 |
| CATERPILLAR 161-6154 |
| PAI 321243 |
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.

















