CAT 348-9904 Cylinder Block for C27 and C32 Engines

The CAT 348-9904 cylinder block is a core engine component designed for heavy-duty Caterpillar diesel engines, especially CAT C27 and CAT C32 engine applications. As the main structural foundation of the engine, the cylinder block supports the crankshaft, cylinder bores, cooling passages and combustion-related loads, helping the engine maintain reliable power output in demanding industrial, mining and construction environments.

This cylinder block is commonly used in heavy equipment where high load, long working hours and stable engine performance are required. It is suitable for customers who need replacement cylinder blocks, engine rebuild support, repower projects or part matching assistance for Caterpillar C27 / C32 engine-related applications.

Not sure whether CAT 348-9904 fits your engine or machine? Send us your engine nameplate, machine serial number or old cylinder block photos, and our technical team will help check compatibility before quotation.

Key Specifications and Compatibility

The CAT C27 engine uses a V12 configuration designed for stable power output under high-load and continuous-duty operation. The C32 engine can deliver up to 1000 hp and about 4500 N·m of torque, making it suitable for demanding heavy equipment applications.

For related complete engine references, you can also check our C27 engine product page and C32 engine product page.

Material and Design Features

The CAT 348-9904 cylinder block is cast from high-strength alloy iron, providing strong resistance to high temperature, high pressure and wear. This is important for heavy-duty diesel engines that work under continuous load, vibration and demanding site conditions.

Compared with aluminum blocks, alloy iron provides higher structural strength, better wear resistance and greater deformation resistance. These characteristics help extend service life and reduce maintenance risk in heavy diesel engines used for construction, mining, hauling and industrial power applications.

Structural and Cooling Design

• Precision-cast cylinder bores: support stable piston movement, reduced vibration and lower engine noise.
• Efficient cooling passages: help coolant flow evenly through the block and maintain suitable engine temperature.
• Heavy-duty block structure: designed to withstand internal combustion force, mechanical impact and long working hours.

This structure helps the engine stay cool, stable and reliable in high-temperature and high-load environments commonly found in mining sites, construction projects and heavy-duty equipment operation.

Main Applications

Mining Machinery

The CAT 348-9904 cylinder block is suitable for heavy mining equipment where engines must operate under high load, dust, heat and long working shifts. A reliable cylinder block is important for reducing downtime and supporting stable engine rebuild performance.

Large Construction Equipment

For large dozers, loaders, excavators and other construction machines, the cylinder block provides the structural strength required for heavy-duty operation, frequent load changes and demanding jobsite conditions.

Heavy Haul Trucks and Cranes

In heavy haul trucks, cranes and other large mobile equipment, the cylinder block must withstand continuous torque demand, vibration and long operating hours. Correct part matching is important before replacement or engine overhaul.

Repower and Conversion Projects

Part number 348-9904 may also be involved in Caterpillar D10N tractor repower or engine conversion applications, including Tier III emission-related conversion projects. Compatibility can depend on machine serial number, engine configuration and required modifications.

Fitment Confirmation Before Purchase

Because Caterpillar engines and machines may have different configurations, customers should confirm compatibility before purchasing the CAT 348-9904 cylinder block. Not every C27, C32 or D10N-related application uses the same cylinder block configuration.

To reduce mismatch risk, please provide the engine model, engine serial number, machine model, machine serial number, old part number and clear photos of the existing cylinder block. For conversion or repower projects, please also provide the current engine arrangement and application details.

Maintenance and Purchase Guide

Daily Maintenance Tips

Proper lubrication, cooling and sealing inspection are important for extending the service life of the 348-9904 cylinder block and related engine components.

• Lubrication: use suitable SAE 15W-40 engine oil according to operating conditions and maintenance requirements. Regular oil changes help reduce wear between piston rings and cylinder walls.
• Cooling system care: clean cooling passages regularly to prevent scale buildup that may reduce cooling efficiency. Use suitable coolant or antifreeze according to operating temperature requirements.
• Seal inspection: perform pressure tests to check sealing condition between the cylinder block and cylinder head. If leakage is found, replace the gasket or related sealing components in time.

Genuine Part Purchasing Tips

When sourcing a CAT 348-9904 cylinder block, correct part identification is essential. A wrong cylinder block may cause installation failure, abnormal pressure, cooling issues or serious engine damage.

• Check whether part number 348-9904 matches your engine model and machine configuration.
• Confirm cylinder count, engine arrangement and application type before order confirmation.
• Distinguish between marine, industrial and land-based equipment applications, as operating requirements may differ.
• Work with a professional Caterpillar engine parts supplier that can support part matching and technical confirmation.

Related Part Numbers

The following part numbers may be related to CAT 348-9904 cylinder block applications. Final matching should be confirmed by engine serial number, machine serial number or original part number.

Why Work With ZEB Power?

• Multiple quality options: Original/OEM and remanufactured options may be available depending on project budget and stock condition.
• CAT parts sourcing support: support for cylinder blocks, engine overhaul parts and related Caterpillar engine components.
• Stock verification: help customers check current availability before order confirmation, especially for urgent mining and heavy equipment maintenance projects.
• Part matching support: technical team can help verify compatibility by engine serial number, machine serial number, old part number and photos.
• Long-term project supply: suitable for distributors, repair workshops, mining operations and heavy equipment maintenance companies.
• Export experience: serving mining and industrial clients across South America, Africa, CIS, Australia and Southeast Asia.

Packaging and Shipping

Each engine part undergoes appearance inspection and part number verification before shipment. Heavy engine components such as cylinder blocks are packaged with reinforced protection to reduce transportation risk, while key components can be packed in independent shock-proof containers when required.

We maintain long-term cooperation with international freight forwarders and support trade terms such as CIF, FOB and DDP according to customer requirements. Customers in Africa, Latin America and Southeast Asia usually choose LCL or FCL shipping by sea, with an average delivery cycle of 18–25 days depending on destination and shipping schedule.

Frequently Asked Questions

What is CAT 348-9904?

CAT 348-9904 is a cylinder block used in Caterpillar heavy-duty engine applications. It is commonly associated with CAT C27 and CAT C32 engine-related applications, and may also appear in certain D10N tractor repower or conversion projects.

Is CAT 348-9904 compatible with every C27 or C32 engine?

No. Compatibility depends on engine serial number, machine model, machine serial number, cylinder count, engine arrangement and application type. Please confirm the part number before purchase.

Can this cylinder block be used for Caterpillar D10N machines?

The 348-9904 cylinder block may be used in certain Caterpillar D10N tractor applications, including Tier III emission repower or conversion projects. Not all D10N units use this block, and compatibility may depend on serial numbers such as EHX5681-UP or 2YD1-UP.

What is the main dimension of the 348-9904 cylinder block?

The overall length of the 348-9904 cylinder block is approximately 1177.30 mm.

Are there alternative or related part numbers?

Yes. Common related part numbers include 348-9905, 384-9907 and 316-9147. Final replacement should be confirmed by engine serial number or original part number.

What information should I provide before ordering?

Please provide the engine model, engine serial number, machine model, machine serial number, old part number, application type, required quantity and destination country. Clear photos of the old cylinder block and nameplate are helpful for compatibility checking.

Contact and Inquiry

For accurate quotation and compatibility checking, please provide:

• Engine model and engine serial number
• Machine model and machine serial number
• Old cylinder block part number
• Photos of the engine nameplate and old cylinder block
• Application type and required quantity
• Destination country or port

Contact us to check CAT 348-9904 cylinder block availability and compatibility