Caterpillar O-Ring, PAI 321326 (OEM 8J4351), Pack of 4
Used In These Kits
This part is included in 10 engine & overhaul kits — find yours below.
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321380Caterpillar C10/C12 Oil Cooler Installation O-Ring Kit, PAI (OEM 1433009), Pack of 1 In stock -
321406Caterpillar C12 Oil Pump Mounting O-Ring Kit, PAI (OEM 7X7975), Pack of 1 In stock -
321407Caterpillar C10/C12 Oil Cooler Installation O-Ring Kit, PAI (OEM 1933322), Pack of 1 In stock -
331509Cat / Caterpillar C13 ENGINE O-RING KIT In stock -
331511Cat / Caterpillar FRONT GASKET KIT In stock -
331512Cat / Caterpillar OIL COOLER GASKET KIT In stock -
331546Caterpillar C11 Oil Cooler Gasket Kit In stock -
331562Caterpillar 3176 Lower Gasket Set In stock -
331623Cat / Caterpillar C10 ENGINE OIL COOLER O-RING KIT In stock -
331627Caterpillar 3176 / 3176C Central/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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321325Caterpillar O-Ring, PAI (OEM 6V3683), Pack of 4 In stock -
321374Caterpillar O-Ring, PAI (OEM 6V5134), Pack of 3 In stock -
321257Caterpillar Viton O-Ring, PAI (OEM 5P8068), Pack of 5 In stock -
GGA-2909Viton O-Ring, PAI (OEM 56AX596), Pack of 5 In stock -
340061Caterpillar 3406E / C15 / C16 Nut In stock
| Brand | PAI Industries |
| Part Category | Seals & O-Rings |
| Sub-Type | O-Ring |
| Engine Make | Caterpillar |
| Engine Model | 3406E · C15 · C16 · C18 |
| Condition | New |
| Stage / Tier | Standard |
Pack of 4.
PAI 321326 is an o-ring. PAI lists Viton material. The listed durometer is 75. Listed cross section is 0.139 inch. Listed inside diameter is 1.734 inches. The manufacturer designates product-level OEM 8J4351.
Compatible Engines
PAI lists Caterpillar 3406E Series; Caterpillar C15 Engine; Caterpillar C16 Engines; Caterpillar C18 Engine. Match the complete required part number and listed application before ordering.
Manufacturer product cross-references
Caterpillar 153-0500
Caterpillar 1530500
Caterpillar 5M0281
Caterpillar 8J4351
Compare the complete part number, material and required seal specification before ordering.
PAI Part #: 321326
OEM References:
- CATERPILLAR 153-0500
- CATERPILLAR 1530500
- CATERPILLAR 5M0281
- CATERPILLAR 8J4351
Applications:
- CATERPILLAR 3406E SERIES
- CATERPILLAR C15 ENGINE
- CATERPILLAR C16 ENGINES
- CATERPILLAR C18 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 |
|---|
| 153-0500 |
| 1530500 |
| 5M0281 |
| 8J4351 |
| CATERPILLAR 153-0500 |
| CATERPILLAR 1530500 |
| CATERPILLAR 5M0281 |
| CATERPILLAR 8J4351 |
| PAI 321326 |
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.















