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

1. Verify block part number and serial number match the engine build sheet and ESN (Engine Serial Number) before fitting liners or bearings.
2. 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.
3. Fit new wet liners with genuine Cummins seal kits; check liner protrusion height with a dial indicator to ensure proper head gasket compression.
4. 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.