Cummins KTA50 Cylinder Block
Core Part Numbers (Industrial Version): 3178803 (primary), 3648602 (integrated engine assembly), 3175690 (high-power industrial variant)
Configuration: 60° V16, wet cylinder liner design, cast iron monoblock
Bore Diameter: 159 mm (6.25 in)
Material: High-strength nodular cast iron (HT250/Grade 30 gray iron, heat-treated)
Application: Mining, oil & gas, industrial G-drive, heavy construction, power generation (KTA50?C/KTA50?G series)
Operating Pressure Rating: Capable of withstanding peak cylinder pressures >180 bar (2610 psi) for 24/7 heavy-duty service
Product Overview
The
Cummins KTA50 cylinder block is the structural backbone of the KTA50 V16 diesel engine—purpose-built for the most severe industrial environments. As a one-piece monoblock with an integrated 60° V-angle design, it provides exceptional rigidity, minimal vibration, and long-term dimensional stability under extreme thermal and mechanical loads. Its wet-liner architecture enables cost-effective in-frame overhauls, while integrated coolant galleries and reinforced main bearing saddles are optimized for the high power density (up to 2000 hp/1492 kW) of the KTA50 platform. It is the standard foundation for all industrial KTA50?C models and dual?use KTA50?G generator sets.
Design & Engineering Features
Material & Manufacturing
- High?Strength Cast Iron Construction: Heat?treated, stress?relieved gray iron casting with precise control of carbon content and grain structure; resists thermal fatigue, cracking, and distortion in 50°C+ ambient conditions.
- Monoblock 60° V?Design: Single?piece casting eliminates bolted joints between banks, reducing flex and oil/coolant leaks; integrated core plugs and gallery seals for long?term reliability.
- CNC Machined Critical Surfaces: Bore decks, main bearing bores, camshaft tunnels, and mounting faces are finished to microns for perfect fitment of liners, bearings, and attachments.
- Reinforced Main Bearing Caps & Saddle: Extra material around the 9?point main bearing system; cross?bolted caps to handle the high torque and firing loads of the 13.9:1 compression?ratio industrial KTA50.
Cooling & Lubrication Integration
- Dual?Loop Coolant Galleries: Separate passages for cylinder wall cooling and jacket?water aftercooling (JWAC); directed flow to prevent hotspots in the V?bank and liner?seal areas.
- Full?Pressure Oil Gallery System: Internal cast oil passages deliver filtered oil to main bearings, camshaft bearings, and cross?drilled crankshaft; eliminates external oil lines, reduces leak points.
- Wet Cylinder Liner Compatibility: Precision?machined liner bores with honed finishes to retain the compression seal and distribute coolant evenly; accepts industry?standard liners (3022157, 4044403) and liner kits (3007525).
Mounting & Interface
- Integrated Engine Mount Pads: Heavy?duty cast bosses on the bottom and sides for rigid installation in mining trucks, drilling rigs, and industrial skids; compatible with Cummins standard vibration isolators.
- Front/ Rear Accessory Faces: Machined mounting surfaces for timing gears, water pumps, oil pumps, and flywheel housing; bolt patterns meet SAE industrial standards for easy equipment integration.
- Cylinder Head Seating Surface: Precision flatness with O?ring grooves for multi?layer steel (MLS) head gaskets (3801310, 4955268), preventing high?pressure combustion gas leakage.
Technical Specifications Table
| Parameter |
Industrial KTA50 Block (3178803) |
Notes |
| Block Type |
60° V16 monoblock, wet liner |
One?piece cast iron |
| Material Grade |
HT250 (Grade 30 gray iron), heat?treated |
Stress?relieved post?casting |
| Bore Size |
159 mm (6.25 in) |
For wet liners 3022157/4044403 |
| Main Bearing Count |
9 main bearings |
Cross?bolted caps |
| V?Angle |
60° |
Optimal balance for V16 |
| Key Part Numbers |
3178803 (standalone block); 3648602, 3175690, 3175640 (engine assemblies) |
Confirm ESN/SO for exact part |
| Weight (Dry, No Liners) |
~1280 kg |
Heavier than marine/genset variants due to industrial reinforcement |
| Finish Standard |
Ra 0.8–1.6 μm on critical mating surfaces |
CNC?ground & honed |
Application Compatibility & Part Differentiation
- Industrial (KTA50?C): The block 3178803 is standard for 1400–2000 hp mining, construction, and oilfield engines; thicker webbing and stronger bearing caps vs. marine/genset blocks.
- Power Generation (KTA50?G): Same core casting (3178803) but may have different gallery plugs for JWAC; confirm ESN for accessory mounting differences.
- Marine (KTA50?M): Marine blocks often have corrosion?resistant coatings and different drain/fill points; not interchangeable with industrial blocks for critical service without validation.
Installation, Maintenance & Inspection Guidelines
Installation Best Practices
- Verify block part number and serial number match the engine build sheet and ESN (Engine Serial Number) before fitting liners or bearings.
- Clean all coolant and oil galleries with hot, filtered solvent; pressure?test for leaks at 3 bar (43 psi) coolant pressure and 5 bar (72 psi) oil pressure.
- Fit new wet liners with genuine Cummins seal kits; check liner protrusion height with a dial indicator to ensure proper head gasket compression.
- Torque main bearing cap bolts to Cummins spec (step?torque sequence); retorque after initial engine heat?up.
Inspection & Service Intervals
- Pre?Overhaul: Check for bore wear, liner?seal pitting, and main bearing bore distortion using a dial bore gauge.
- Coolant Maintenance: Use Cummins Extended Life Coolant (ELC); test annually for pH and corrosion inhibitors to prevent internal block rust.
- Block Reconditioning: Resurfacing of the deck and bearing bores should only be done by an authorized Cummins machine shop to maintain dimensional tolerances.
Quality & Warranty
- OEM Manufacturing: Produced in Cummins/CCEC (Chongqing Cummins) plants under ISO 9001 quality control; 100% pressure?tested and inspected before shipment.
- Warranty: Factory?backed warranty for genuine parts (typically 12 months/1000 hours for industrial applications); void if non?genuine liners, gaskets, or improper installation procedures are used.
- Global Availability: Available through Cummins’ worldwide dealer network; core exchange programs available for faster replacement in remote locations.
