Description
4089478 Upper Gasket Set | Cummins L10 M11 ISM Engine Overhaul Kit | OEM Quality
English: The Cummins 4089478 Upper Engine Gasket Set (upper overhaul kit / head gasket set) is a genuine OEM complete upper sealing package for Cummins heavy-duty diesel engines. Includes cylinder head gasket, intake/exhaust manifold gaskets, valve cover gasket, turbo gaskets, O-rings, and all required upper seals. Designed to prevent oil, coolant, and compression leaks during cylinder head replacement or top-end repairs. Built with high-quality multi-layer steel, graphite, and composite materials for excellent heat resistance and sealing in demanding conditions.
Compatible Engines & Applications
- Cummins L10 Series: L10, L10E
- Cummins M11 Series: M11
- Cummins ISM / QSM Series: ISM, QSM11 (including EPA98 11L versions)
- Common Applications: Heavy trucks, buses, construction equipment, industrial generators, and machinery powered by Cummins L10/M11/ISM engines
Key Specifications
| Specification | Details |
|---|---|
| Part Number | 4089478 |
| Type | Upper Engine Gasket Set |
| Gross Weight | Approx. 4–11 lbs (2–5 kg, varies by source) |
| Material | Multi-layer steel, graphite, composites |
| Warranty | 6–24 months (OEM/aftermarket standard) |
| Origin | Genuine Cummins OEM or certified aftermarket |
Benefits & Features
- Comprehensive upper kit – all seals in one package for efficient repairs
- Reliable leak prevention & high-temperature durability
- Direct OEM replacement, professional install in 60–120 minutes
- Cost-effective for fleets and repair shops
- Genuine quality stock with fast shipping
Installation Tips
- Clean all surfaces thoroughly (remove old gasket material)
- Follow Cummins torque sequence/specs
- Replace head bolts if stretched; change oil/filter
- Test for leaks after startup
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