Product Description
The Cummins 3977913 OEM engine oil cooler gasket set is the genuine sealing kit used around the oil cooler and filter housing on 2003–2007 Ram 5.9L and 2007.5–2023 Ram 6.7L Cummins ISB engines. Designed by Cummins for high oil temperature and pressure, this kit restores a factory-tight seal when you service or replace the oil cooler, helping keep hot oil inside the cooler core instead of on your driveway or down the block.
Instead of mixing generic aftermarket gaskets, 3977913 packages the critical seals you need in one OE kit so you can bolt the cooler back on with confidence. If you are installing a new oil cooler such as CUMMINS 3959031 OEM ENGINE OIL COOLER – ISB 5.9L (2003–2007) or CUMMINS 3975818 OEM ENGINE OIL COOLER – ISB 6.7L (2007.5–2024), this is the OE gasket set Cummins calls out.
Every gasket is manufactured to Cummins specifications for material, thickness, and crush characteristics, so the cooler, block, and oil filter head clamp together evenly. That means fewer comeback leaks, more stable oil pressure, and better long-term protection for bearings, camshaft, and turbocharger when towing, tuned, or working the truck hard.
Fitment – Ram 5.9L & 6.7L Cummins
- Engine family: Cummins ISB / 6B, B-series diesel
- Primary truck fitment – 5.9L: 2003–2007 Dodge Ram 2500 & 3500 with 5.9L Cummins (all cab and drivetrain configurations; verify by ESN/VIN).
- Primary truck fitment – 6.7L: 2007.5–2023 Ram 2500/3500/4500/5500 with 6.7L Cummins ISB (verify by ESN/VIN for cab-chassis and commercial variants).
- Additional applications: Common on select Cummins ISB/QSB/6B industrial and off-highway engines that use the same stacked-plate oil cooler and filter head design – always confirm by engine serial number (ESN) before ordering for non-Ram equipment.
What’s Included – Cummins 3977913 Gasket Set
- Oil cooler to housing gaskets and seals (application-specific for ISB/6B cooler assembly).
- Filter head / adapter interface seals as required by the OE configuration.
- High-temp, oil-resistant materials designed to maintain clamp load under heat-soak and vibration.
- Genuine Cummins packaging and traceability – not a “will-fit” copy.
Cross-Reference & OEM Numbers
- Cummins: 3977913 (lub oil cooler gasket set)
- Chrysler / Mopar: 5086834AA, 5135787AA, 5179064AA (supersessions / equivalent OE gasket kits, verify by VIN).
- Aftermarket kit reference: MAHLE GS33485 (engine oil cooler gasket set that replaces Cummins 3977913 – ID only).
Related Cummins Genuine Parts at CPP Diesel
- CUMMINS 3959031 OEM ENGINE OIL COOLER – ISB 5.9L (2003–2007) – Genuine 5.9L cooler core that pairs with 3977913 when servicing the lubrication system.
- CUMMINS 3975818 OEM ENGINE OIL COOLER – ISB 6.7L (2007.5–2024) – OE 6.7L stacked-plate cooler; often installed with 3977913 on high-mileage trucks.
- CUMMINS 5289557 OEM ENGINE OIL FILTER HOUSING (OIL FILTER HEAD) – RAM 5.9L/6.7L (2003–2018) – Genuine filter head that mates to the same oil cooler and gasket set.
- CUMMINS 2830559 OEM OIL COOLER GASKET (COOLER TO ENGINE BLOCK) – ISB 6.7L (2007.5–2022) – Block-side cooler gasket commonly used with 3975818 on 6.7L applications.
- CUMMINS 3974127 OEM OIL COOLER TO FILTER HEAD GASKET – ISB 6.7L – Seals the cooler to the filter head on late-model 6.7L trucks.
Why Choose Genuine Cummins 3977913 from CPP Diesel?
- Direct-fit OE gasket set engineered specifically for the Cummins ISB/6B oil cooler system.
- Better long-term sealing than generic aftermarket paper gaskets, especially under high EGT and towing.
- Pairs perfectly with genuine Cummins coolers and filter heads available on CPP Diesel.
- Backed by CPP Diesel’s Cummins parts expertise and fast shipping.
Specifications for cummins 3977913
| Field | Value |
|---|---|
| Part Number | Cummins 3977913 – Lub Oil Cooler Gasket Set |
| UPC | Not specified by Cummins (no published UPC/GTIN available at time of writing). |
| GTIN | Not specified by Cummins (OEM service part without public GTIN listing). |
| Cross Reference | Cummins 3977913; Chrysler/Mopar 5086834AA, 5135787AA, 5179064AA; Mahle GS33485 (ID only, verify by application). |
| E-Codes / Engine Families | ISB 5.9L common-rail; ISB 6.7L; related 6B / QSB applications using the same stacked-plate oil cooler and filter head design (confirm by ESN). |
| Shipping Weight | Approx. 0.4–0.5 lb (lightweight gasket kit; ships in protective flat packaging). |
| Shipping Info | Ships from CPP Diesel via standard ground service; small-parcel friendly, typically combines with oil cooler and filter head orders. |
| Country of Origin | Genuine Cummins OEM service part (origin varies by Cummins production batch). |
| California Prop 65 | No specific Prop 65 warning listed for this gasket set as of the latest Cummins and distributor data. |
FAQ – Cummins 3977913 Oil Cooler Gasket Set
Is this a genuine Cummins OEM gasket set or an aftermarket kit?
This listing is for a genuine Cummins 3977913 OEM oil cooler gasket set sourced through CPP Diesel’s Cummins channel. It is not an aftermarket substitute, and it is intended to match the materials, thickness, and sealing performance specified by Cummins.
When should I replace the 3977913 gasket set?
Replace the gasket set any time the oil cooler is removed, replaced, or if you see oil seeping from the cooler housing, filter head interface, or block mounting surface. Re-using old compressed gaskets is a common cause of repeat oil leaks after cooler service.
Which trucks and engines use Cummins 3977913?
3977913 is widely used on 2003–2007 Ram 2500/3500 with the 5.9L Cummins and 2007.5–2023 Ram 2500/3500/4500/5500 with the 6.7L Cummins ISB, along with related B-series/6B/QSB industrial engines that share the same oil cooler architecture. Always confirm by engine serial number (ESN) if you are unsure.
Should I replace the oil cooler at the same time?
If your engine has high miles, overheated oil, or evidence of cooler plugging or internal leakage, it is smart to replace the cooler core while it is apart. For 5.9L trucks, consider CUMMINS 3959031 OEM ENGINE OIL COOLER – ISB 5.9L (2003–2007); for 6.7L trucks, consider CUMMINS 3975818 OEM ENGINE OIL COOLER – ISB 6.7L (2007.5–2024).
Do I need any other gaskets or hardware with 3977913?
Depending on year and configuration, you may also want the block-side gasket CUMMINS 2830559, the cooler-to-filter-head gasket CUMMINS 3974127, and the oil filter housing CUMMINS 5289557. Many shops also replace the oil and filter and perform a short-interval oil change after major lubrication system service.
