Cummins KTA50 Parts List: Complete OEM Spare Parts Catalog for V16 50-Liter Generator Engines
The Cummins KTA50 is the flagship of the KTA family—a V16, 50-liter (3,050 cubic inch) turbocharged diesel engine that powers the world’s largest single-engine generator sets, delivering 1,000 to 1,875 kVA of standby power. These engines are deployed in mission-critical applications where failure is not an option: large hospital complexes, colocation data centers (10+ MW), semiconductor fabrication plants, offshore oil platforms, and utility peaking plants. A single KTA50-GS8 generator set can power an entire medium-sized hospital. With 16 cylinders, dual turbochargers, and a fuel consumption of up to 350 L/hr at full load, the KTA50 demands meticulous parts management—stocking the right spares can mean the difference between a 2-hour repair and a 2-week procurement delay.
This catalog provides a comprehensive listing of major assemblies and service parts for KTA50-G3, KTA50-G8, and KTA50-GS8 generator-drive engines, with OEM Cummins part numbers verified against the latest QuickServe and IPC data. Part numbers apply to G-Drive (generator) applications at 1500 RPM (50 Hz) and 1800 RPM (60 Hz).
KTA50 Engine Technical Specifications
| Parameter | KTA50-G3 | KTA50-G8 | KTA50-GS8 |
|---|---|---|---|
| Configuration | V16, 60° bank angle, 4-stroke diesel | ||
| Bore x Stroke | 159 mm x 159 mm (6.25 in x 6.25 in) | ||
| Displacement | 50.3 L (3,072 in³) | ||
| Compression Ratio | 13.9:1 | ||
| Standby Rating | 1097 kW / 1371 kVA | 1280 kW / 1600 kVA | 1500 kW / 1875 kVA |
| Prime Rating | 1000 kW / 1250 kVA | 1165 kW / 1456 kVA | 1365 kW / 1706 kVA |
| Fuel System | Cummins PT (Pressure-Time) mechanical injection | ||
| Dry Weight | Approx. 5,100 kg (11,245 lbs) | ||
| Oil Capacity | 175-200 L (46-53 gallons) | ||
Cylinder Head Assembly Parts
| Part Description | Cummins Part Number | Qty | Notes |
|---|---|---|---|
| Cylinder Head (bare, per bank) | 3636310 | 4 | 4 heads total; 2 per V-bank; each covers 4 cylinders |
| Intake Valve | 3802640 | 32 | Same valve as KTA19/KTA38; Stellite-faced |
| Exhaust Valve | 3636500 | 32 | Same as KTA38; sodium-cooled Stellite-faced |
| Head Gasket (per head) | 3636530 | 4 | MLS gasket; same as KTA38 per-cylinder head |
| Head Bolt Set (per head) | 3636540 | 4 sets | Same as KTA38; torque-to-yield—replace every time |
Piston, Liner, and Connecting Rod Parts
| Part Description | Cummins Part Number | Qty | Notes |
|---|---|---|---|
| Piston Assembly (with rings and pin) | 3648300 | 16 | KTA50-specific articulated piston; steel crown + aluminum skirt |
| Piston Ring Set | 3648310 | 16 | Chrome top ring, taper second, 3-piece oil control |
| Cylinder Liner (wet type) | 3648320 | 16 | KTA50-specific liner; same bore diameter as KTA19/KTA38 but different O-ring grooves and length |
| Liner O-ring Kit | 3648330 | 16 kits | 3 O-rings per liner; upper nitrile, middle silicone, lower fluorocarbon |
| Connecting Rod Assembly | 3648340 | 16 | KTA50-specific forged steel; heavier section than KTA38 |
| Connecting Rod Bearing (Std) | 3648350 | 16 pairs | Tri-metal; undersizes 0.25/0.50/0.75mm available |
Crankshaft, Main Bearings, and Damper
| Part Description | Cummins Part Number | Qty | Notes |
|---|---|---|---|
| Crankshaft Assembly | 3648400 | 1 | Forged steel; 9 main journals; 8 crankpins (paired cylinders share); ~450 kg |
| Main Bearing Set (Std) | 3648410 | 9 pairs | Upper grooved, lower plain; 4-bolt main caps |
| Thrust Bearing (Rear Main #9) | 3648420 | 1 pair | Flanged; controls crankshaft axial position |
| Front Crankshaft Oil Seal | 3648430 | 1 | PTFE lip seal; large diameter for KTA50 crank nose |
| Rear Crankshaft Oil Seal | 3648440 | 1 | PTFE lip seal; housing alignment critical (0.10mm TIR max) |
| Vibration Damper | 3648450 | 1 | KTA50-specific viscous damper; ~55 kg; 8,000 hr recommended replacement |
Turbocharger and Air System
| Part Description | Cummins Part Number | Qty | Notes |
|---|---|---|---|
| Turbocharger (Holset HX60) | 3085610 | 2 | KTA50-specific HX60; significantly larger than KTA38 HX50; dual configuration per bank |
| Turbo Gasket Kit (per turbo) | 3648500 | 2 kits | Oil feed/drain gaskets, V-band clamp gasket |
| Aftercooler Core (per bank) | 3648510 | 2 | High-capacity air-to-water aftercooler; KTA50-specific |
| Exhaust Manifold (per bank) | 3648520 | 2 | 8-port log-type; Ni-Resist cast iron |
Fuel System (PT) Parts
| Part Description | Cummins Part Number | Qty | Notes |
|---|---|---|---|
| PT Fuel Pump Assembly | 3081973 | 1 | KTA50-specific PT pump; higher flow calibration for V16 fuel demand |
| Fuel Injector (PT Type) | 3085973 | 16 | KTA50-specific PT injector; different flow rate from KTA19/KTA38 injectors |
| Injector O-ring Kit | 3648600 | 16 kits | Per injector: upper/lower O-rings + copper seating washer |
| Fuel Shutoff Solenoid (ETR) | 3082560 | 1 | Same as KTA19/KTA38 |
| Fuel Filter Primary (FF202) | 3896693 | 1 | KTA50 uses FF202 as primary (3-micron with water separation capability) |
| Fuel Filter Secondary (FF5076) | 4006116 | 1 | KTA50-specific 2-micron final filter; expanded dirt-holding capacity |
| Fuel Transfer Pump | 3086198 | 1 | KTA50-specific; higher displacement gear pump for V16 fuel flow (approx. 350 L/hr) |
Lubrication and Cooling System Parts
| Part Description | Cummins Part Number | Qty | Notes |
|---|---|---|---|
| Oil Pump Assembly | 3648312 | 1 | KTA50-specific; high-capacity gear pump for V16 oil demand |
| Oil Filter (Fleetguard LF9050) | LF9050 | 2 | KTA50 uses duplex filter head with LF9050 (larger than LF9009 KTA19/38) |
| Oil Cooler Assembly | 3641740 | 1 | KTA50-specific; larger core than KTA38; critical for V16 thermal management |
| Water Pump Assembly | 3636466 | 1 | KTA50-specific; higher flow rate than KTA19/KTA38 shared 3802258 pump |
| Thermostat (82°C) | 3636558 | 2 | KTA50-specific thermostat; dual thermostat housing |
Overhaul Kits and Service Intervals
| Part Description | Cummins Part Number | Contents |
|---|---|---|
| Upper Engine Gasket Kit | 3648700 | 4 head gaskets, rocker cover gaskets, manifold gaskets, injector O-rings, water connections |
| Lower Engine Gasket Kit | 3648710 | Oil pan, front/rear cover, oil cooler, oil pump, tappet cover gaskets |
| In-Frame Overhaul Kit | 3648720 | 16 pistons, 16 liners w/O-rings, 16 connecting rod bearing pairs, upper + lower gasket kits |
| Major Overhaul Kit | 3648730 | In-Frame Kit + 9 main bearing pairs, thrust washers, front/rear crank seals, 4 sets head bolts, cam bearings |
KTA50-Specific Maintenance Considerations
- Vibration Damper is Critical: The KTA50’s 55 kg viscous damper (3648450) is the single most important maintenance item. At this engine size, torsional vibration energy is enormous—a failed damper can crack the 450 kg crankshaft within 300-500 hours. Inspect every 4,000 hours; replace at 8,000 hours or first sign of silicone leakage or rubber degradation. The KTA50 damper costs approximately $4,000-6,000—expensive, but a fraction of a $35,000+ crankshaft replacement.
- Dual Turbocharger Synchronization: Both HX60 turbochargers (3085610) must be at similar condition. If one turbo is replaced but the other is worn (higher bearing clearance, slower spool), the cylinder banks will receive unequal charge air, causing power imbalance and potential bearing damage.
- Oil Pressure Monitoring: At hot idle (600 RPM), minimum oil pressure is 0.7 bar (10 psi). At rated speed (1500/1800 RPM), pressure should be 3.5-4.8 bar (50-70 psi). Declining hot idle pressure is the earliest indicator of main/rod bearing wear. Install a permanent oil pressure trend recorder if the engine is in a critical facility.
- Injector Matching: With 16 injectors (3085973), fuel distribution balance is critical. Always replace injectors as a flow-matched set of 16. Individual injector replacement on a KTA50 can create cylinder-to-cylinder power variation exceeding 5%, stressing the crankshaft and causing uneven bearing wear.
KTA50 Parts Supply—OEM Genuine with Global Logistics
We stock KTA50 parts from gaskets to complete overhaul kits. As a specialized Cummins parts supplier, we serve power plants, data centers, and offshore operators worldwide. Full Certificate of Origin, competitive B2B pricing, air and sea freight options. Also see our KTA19 and KTA38 parts catalogs.
Email: sales@huaquanpower.net
Frequently Asked Questions
Q1: What makes KTA50 parts different from KTA19/KTA38 parts?
While KTA engines share the same 159mm bore/stroke architecture, KTA50-specific differences include: PT pump (3081973 vs. 3020960), injectors (3085973 vs. 3802135), turbochargers (HX60 3085610 vs. HX50 3802584), oil pump (3648312 vs. 3089917), water pump (3636466 vs. 3802258), fuel transfer pump (3086198 vs. 3093942), secondary fuel filter (FF5076 vs. FF202), oil filters (LF9050 vs. LF9009), vibration damper (3648450), and pistons/liners/rods. The cylinder head per-bank design is shared with KTA38 but KTA50 uses 4 heads total (2 per bank, each covering 4 cylinders) unlike KTA38’s 2 heads (1 per bank, each covering 6 cylinders).
Q2: Why is the KTA50 vibration damper so critical?
At 50 liters and 16 cylinders firing every 45° of crankshaft rotation, the KTA50 generates enormous torsional vibration energy. The viscous damper (3648450, ~55 kg) absorbs these vibrations through shearing of internal silicone fluid. When the fluid degrades (~8,000 hrs), the damper stops functioning. The crankshaft then absorbs the vibration directly, and fatigue cracks initiate at the main journal fillet radii. The KTA50 crankshaft costs $35,000-50,000 and takes 4-12 weeks to procure. A $5,000 damper replacement every 8,000 hours is insurance against a catastrophic failure.
Q3: Why does KTA50 use FF5076 secondary filter instead of FF202?
The FF5076 provides 2-micron filtration (vs. 3-micron for FF202) and significantly higher dirt-holding capacity. At the KTA50’s 350 L/hr fuel consumption rate (compared to ~130 L/hr for KTA19), the fuel system processes nearly 3x the fuel volume. The finer 2-micron rating protects the KTA50-specific injectors (3085973) which have tighter-toleranced metering orifices. Using FF202 on a KTA50 risks premature filter bypass and injector contamination. See our Cummins Fuel Filter Replacement Guide for more details.
Q4: How long does a KTA50 last between overhauls?
In-frame overhaul: 20,000-30,000 hours (pistons, liners, bearings, cylinder head reconditioning). Major overhaul: 40,000-60,000 hours (includes crankshaft reconditioning). These intervals assume proper maintenance, clean fuel, and primarily prime power operation (75-85% load). Standby generators running 200 hrs/year may reach 30+ calendar years before overhaul due to age-related degradation of seals and gaskets rather than wear. The KTA50 has the longest overhaul interval in the KTA family because its larger displacement means lower BMEP (Brake Mean Effective Pressure) at a given power rating—it is less stressed per unit displacement than the KTA19.
Q5: Can I overhaul just one cylinder bank on a KTA50?
Technically possible but not recommended. Overhauling one bank while leaving the other with worn components creates an engine with unequal compression, different ring sealing characteristics, and varying oil consumption between banks. This causes vibration, uneven power distribution, and accelerated wear on the non-overhauled bank. A KTA50 in-frame overhaul should include all 16 cylinders. The cost difference between a 16-cylinder overhaul and two 8-cylinder half-overhauls separated by 2,000 hours is actually higher when factoring in two teardown/assembly sessions, two gasket kits, and extended downtime.
Q6: What is the KTA50-GS8 vs. standard G8?
The GS8 is the highest-output KTA50 variant (1500 kW standby). Differences from G8: (1) Higher-flow turbocharger specification (HX60 with different compressor trim). (2) Revised piston cooling jets with higher oil flow for additional piston crown cooling. (3) Upgraded aftercooler with larger core area. (4) Revised PT pump calibration with higher fuel delivery. (5) Strengthened cylinder head gasket with different fire ring design for higher cylinder pressures. The engine block, crankshaft, and connecting rods are the same as G8—the GS8 extracts more power through better thermal management and increased air/fuel flow.
Q7: What spare parts should I stock for a single KTA50 generator?
Critical spares for a single KTA50 installation: fuel filters (FF202 + FF5076, 2 sets), oil filters (LF9050, 2 sets), air filter elements (primary + safety, 1 set each), V-belts (1 complete set), thermostats (2), coolant hoses (upper/lower per radiator), water pump (3636466, 1), fuel shutoff solenoid (3082560, 1), injector O-ring kits (4), gasket set for one cylinder head (4 sets), oil pressure sensor (1), coolant temp sensor (1), turbocharger oil feed/drain gaskets (2 sets), vibration damper (3648450, 1—for facilities where downtime cost exceeds $50,000/day). Also stock a complete set of fuel hoses—KTA50 fuel consumption means a leaking hose loses significant fuel.
Q8: Can I use KTA50 marine engine parts on a generator engine?
KTA50-M (marine propulsion) and KTA50-G (generator drive) share many base components but differ in: (1) Governor calibration—marine engines use variable-speed governing; generators need fixed-speed with precise droop control. (2) Cooling system—marine engines use keel cooling or heat exchanger; generators use radiator or remote cooling. (3) Aspiration—some marine KTA50s are naturally aspirated for below-deck fire safety; all G-drive engines are turbocharged/aftercooled. (4) Engine rotation—marine engines may be specified for reverse rotation in twin installations. Always use G-drive specific part numbers for fuel system, governing, and cooling components.
Q9: How should I store a spare KTA50 long block?
A complete KTA50 long block (assembled short block + cylinder heads) weighs approximately 5,100 kg. Storage requirements: (1) Indoor, climate-controlled (15-25°C, <60% humidity). (2) Support on the oil pan flange (not on the engine mounts—they will sag over time). (3) Bar engine over 2 full revolutions every 30 days to redistribute oil and prevent bearing corrosion. (4) Fill fuel system with calibration fluid (not diesel) to prevent PT pump and injector corrosion. (5) Desiccant plugs in all open ports (intake, exhaust, water connections). (6) Rust inhibitor spray on all machined unpainted surfaces (flywheel flange, crank pulley, exposed cylinder bores if heads are off). (7) Oil mist injection into cylinders if storage exceeds 6 months. Long-term stored engines should be commissioned within 5 years—gaskets and seals degrade even in ideal storage.