If you are rebuilding the legendary 3.9L B-Series engine, achieving a precision seal is non-negotiable. Cummins 4BT Gasket Kit (specifically the 3802375 Lower Set) provides the high-grade materials necessary to withstand intense vibrations and extreme mechanical stress. Consequently, using a verified kit is the only way to eliminate persistent oil leaks and maintain factory-standard oil pressure.
🛠️ Comprehensive Component Manifest for the 4BT Lower Set
Cummins 4BT Gasket Kit components are meticulously engineered to protect the engine block, crankshaft, and filtration modules. In addition to the primary seals, this kit includes specialized O-rings and washers that are often overlooked but vital for long-term durability.
Cummins 4BT Gasket Kit reliability depends on the quality of its individual parts. For this reason, we have translated and compiled the following official technical list to help you verify every component in your shipment.
Cummins 4BT Gasket Kit (P/N 3802375) includes the following essential items:
| Part Number | Description (English) | Qty | Key Technical Function |
| 3938162 | Oil Pan Gasket | 1 | Primary sump seal for the 3.9L 4-cylinder block. |
| 3937111 | Front Seal Service Kit | 1 | Protects the crankshaft front from oil loss and dust. |
| 4089342 | Crankshaft Seal Kit | 1 | Main rear oil containment for the flywheel area. |
| 3938156 | Gear Housing Gasket | 1 | Critical interface between the block and timing gears. |
| 3938159 | Rear Cover Gasket | 1 | Seals the rear engine block structure and plate. |
| 3942914 | Oil Cooler Core Gasket | 1 | High-temp seal preventing oil and coolant mixing. |
| 3942915 | Filter Head Gasket | 1 | Ensures filtration system mounting integrity. |
| 3939355 | Fuel Pump Gasket | 1 | Secure mounting for the fuel injection pump. |
| 3901020 / 3937214 | Piston Cooling Nozzle | 8 | Provides internal lubrication for piston crown cooling. |
| 3283767 | Push Rod Cover Gasket | 1 | Also known as the Tappet or Side cover seal. |
| 154916 / 3916042 | Hydraulic Pump Gasket | 2 | Mounting seal for auxiliary hydraulic or steering pumps. |
| 3905595 | Timing Pin Housing Gasket | 1 | Sealing for the TDC (Top Dead Center) timing pin. |
| 3928759 | Grommet Seal | 6 | Vibration-proof isolation and sealing for covers. |
| 3929751 | Accessory Drive Cover Gasket | 1 | Seals the gear drive for air compressors or pumps. |
| 3929792 | Filter Head Gasket | 1 | Primary filtration block interface sealing. |
| 3933261 | Dust Shield | 1 | Protects critical sealing surfaces from debris. |
| 3913994 | O-Ring Seal | 1 | Internal fluid passage and port sealing. |
| 3902425 / 3920773 | Sealing Washer | 3 | High-pressure crush washers for fluid line bolts. |
| 3906696 – 3915800 | Rectangular Ring Seal | 9 | Multi-spec geometric seals for oil/coolant ports. |
📷 Product Identification & Visual Layout
Below is the physical layout of the Cummins 4BT Gasket Kit. Furthermore, note the compact 4-cylinder oil pan gasket which is the primary hallmark of the 3.9L B-Series engine.
🚀 Pro-Tips for Successful Installation
To ensure your Cummins 4BT Gasket Kit performs at its peak, you must follow strict installation protocols. First, modern PTFE (Teflon) crankshaft seals must be installed completely dry. If you apply grease or oil to the seal lip, the seal will fail prematurely.
Moreover, surface preparation is paramount. Therefore, always use a plastic scraper to clean the aluminum timing and rear covers. This prevents micro-scratches that often lead to persistent oil weeping even with a new gasket.
Finally, never forget to verify your 8-digit Engine Serial Number (ESN) before ordering. Because Cummins manufactured various versions of the B-Series for different regions and years, ESN verification is the only way to guarantee 100% compatibility.
📞 Get a Technical Quote from YZDL Parts
As a global leader in Cummins components, YZDL Parts offers ESN-verified Cummins 4BT Gasket Kits for international customers. We partner with DHL and FedEx to ensure fast, zero-error delivery to your workshop.
- Website: www.yzdlparts.com
- WhatsApp/WeChat: +86 18671978898
- Email: stevencummins8989@gmail.com
