Coolant Caps - Engine Room Consumables and Spares
Coolant caps are pressure-rated closures fitted to marine engine radiators, expansion tanks, or coolant header tanks. They maintain the specified cooling-system pressure and provide controlled pressure relief and coolant recovery where applicable.
ProShipWorks provides end-to-end support to source and supply Coolant Caps for marine vessels, ship operators, industrial facilities, maintenance teams and procurement departments.
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Product Information
| Product Name | Coolant Caps |
|---|---|
| Product Category | Engine Room Consumables and Spares |
| Product Reference | 1393 |
| Brands / Manufacturers | Caterpillar, Cummins, Volvo Penta, MTU, MAN Energy Solutions |
| Unit of Measure | Piece |
Key Features
| Key Feature |
|---|
| 1. Pressure-rated sealing function |
| 2. Temperature-resistant gasket and spring |
| 3. Corrosion-resistant metal or engineering polymer construction |
| 4. Bayonet or threaded fitting depending on tank design |
| 5. Available with pressure-relief and vacuum-relief functions |
Applications of Coolant Caps
| Application |
|---|
| 1. Marine diesel engine cooling systems |
| 2. Auxiliary generator cooling systems |
| 3. Radiators and expansion tanks on workboats and commercial vessels |
Technical Specifications
| Model | Specification | Value | Unit |
|---|---|---|---|
| OEM radiator or expansion-tank cap | Pressure rating | As specified by engine manufacturer | bar |
| OEM radiator or expansion-tank cap | Fitting type | Bayonet or threaded | — |
| OEM radiator or expansion-tank cap | Service temperature | Suitable for the engine coolant operating temperature | — |
| OEM radiator or expansion-tank cap | Seal material | Coolant- and heat-resistant elastomer | — |
Standards, Certifications & Class Approval
Review the available standards and approval information relevant to the product. Actual certification, material traceability, inspection and classification requirements depend on the product type, intended application and purchasing specification.
| Applicable Standards & Certification | No single universal marine standard applies to all coolant caps. Selection and pressure rating should comply with the engine, radiator, or coolant-tank manufacturer's specification. Materials should be compatible with the specified marine engine coolant. |
|---|---|
| Class Approval | Coolant caps are normally treated as engine-system components and are not usually individually class-approved. Where required, acceptance is covered by the approved engine or cooling-system installation under DNV, ABS, Lloyd's Register, BV, or ClassNK requirements. |
Installation, Maintenance & Safety Information
| Installation Notes | Verify cap pressure rating, diameter, locking arrangement, and gasket condition against the OEM part number. Install only after the engine and coolant system have cooled. Clean the filler neck and ensure the cap locks fully without cross-threading. |
|---|---|
| Maintenance Tips | Inspect the seal, spring, valve, and locking tabs during cooling-system maintenance. Replace caps showing corrosion, damaged seals, loss of spring tension, coolant leakage, or incorrect pressure. Do not exceed the OEM pressure rating. |
| Safety Notes | Never remove a coolant cap from a hot or pressurized engine. Allow the system to cool and release pressure slowly using suitable protective equipment. Use only the approved coolant type and maintain the specified coolant level. |
Request a Quote for Coolant Caps
Contact ProShipWorks for marine or industrial product sourcing, quotations and delivery.
- Vessel name and IMO number
- ETA / vessel schedule
- Berth or vessel location
- Required quantity
- Preferred delivery window
- Shipping agent contact details
Other Engine Room Consumables and Spares Products
Explore our range of marine and industrial Engine Room Consumables and Spares products available for sourcing and supply through ProShipWorks.
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