Genuine & OEM
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10,000+ SKU
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Fast Shipping
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Technical Support
ESN-Based Identification
Cummins Engine Parts Supplier — Genuine & OEM Replacement Parts
BLSH Diesel is a professional supplier of Cummins engine parts serving fleet operators, equipment dealers, repair workshops and generator service companies worldwide. We stock over 10,000 SKUs covering fuel systems, lubrication, cooling, turbochargers, electrical components, aftertreatment and overhaul parts for the full range of Cummins diesel engine platforms — from the compact ISB3.9 to the heavy-duty KTA50.
Every component we supply is sourced from DCEC (Dongfeng Cummins), CCEC (Chongqing Cummins), XCEC (Xi’an Cummins) and BFCEC (Beijing Foton Cummins) — the four major Cummins joint-venture manufacturing plants in China — as well as OEM-qualified aftermarket manufacturers. Whether you need a single fuel injector for an emergency repair or a complete overhaul kit for a major rebuild, our ESN (Engine Serial Number) based parts identification service ensures you receive the exact component for your engine.
Browse Cummins Parts by System
Cummins diesel engines comprise several integrated systems. We organize our inventory by engine subsystem so you can quickly locate the component you need. Each category below links to our live parts catalog with real-time stock and pricing.
⛽ Fuel System
High-pressure common rail injectors, fuel pumps (HPFP), transfer pumps, fuel delivery pipes and pressure sensors for DENSO, Bosch and Cummins XPI/CCR systems. Common part numbers include 4903472 (M11), 3077715 (K19) and 5264248 (ISBe).
🛢️ Lubrication System
Oil pumps, oil coolers, oil filters (Fleetguard LF9009/3401544), oil pans, pickup tubes and pressure regulating valves. Regular oil system maintenance prevents premature bearing and camshaft wear.
❄️ Cooling System
Water pumps (3286278 for B/ISB series), radiators, thermostats, cooling fans, fan hubs, water pipes and hoses. Overheating is the #1 cause of catastrophic Cummins engine failure — inspect these components at every service interval.
💨 Turbocharger & Air Intake
Genuine Holset turbochargers including HX30, HX35, HX40, HX50, HX55 and HE-series variable-geometry turbos, plus air filters (AF4553M, 4931610), intercoolers and intake manifolds. We supply complete turbo assemblies, cartridges (CHRA) and rebuild kits.
⚡ Electrical & Control
ECM/ECU modules (4921776, 4384413), engine sensors — oil pressure (4921475), coolant temperature, MAP (2897334), crankshaft position — and complete wiring harnesses. Sensor faults are a leading cause of engine derating and fault codes.
🔋 Start & Charging
Starter motors (4932320 for 4BT/6BT, 4996707 for M11, 4985441 for M11) in 12V and 24V configurations, alternators (3975140 for K19), solenoid switches and starter drive assemblies. Available in genuine Delco Remy, Denso and OEM-equivalent options.
🔩 Crank-Connecting Rod & Block
Cylinder blocks (4991099 for QSB6.7), cylinder heads, crankshafts (3915258 for 6BT/ISB5.9), forged connecting rods, pistons and ring kits, flywheels and flywheel housings. These are core overhaul components — we supply both genuine and OEM-grade forgings.
🔧 Valve Train
Intake and exhaust valves, valve springs, retainers, collets, push rods (3901647 for 6BT/6CT), rocker arms, rocker levers and camshaft assemblies. The valve train controls combustion gas flow and directly affects engine breathing and power output.
🌿 Aftertreatment & Emissions
NOx sensors (4326470, 2897309), urea/doser pumps (0444043135, 0444043162), SCR catalysts, DPF filters and doser injectors for Euro IV/V/VI and EPA Tier 3/4 engines. Aftertreatment faults trigger derate codes — we stock both sensors and complete pump assemblies.
🧰 Filters (Maintenance Kits)
Fleetguard fuel filters (FF5052/3931063, FF5580, FS1006, FF5782), oil filters (LF9009/3401544, LF3970), air filters (AF4553M, AF26531) and water filters (WF2073). Complete filter service kits available for all major Cummins platforms — the most cost-effective preventive maintenance purchase.
🔗 Belts, Seals, Gaskets & Fasteners
V-ribbed belts (3288554 for QSM11, 8PK1460/8PK1762 for B/C series), belt tensioners (3691279), complete gasket sets, oil seals, O-rings, hose clamps/hoops, bolts and tube assemblies. Full overhaul gasket kits prevent the need for repeated teardowns.
📁 Other Components
Air compressors, power steering pumps, flywheel housings, PTO adapters, engine mounts, vibration dampers, oil filler caps, dipsticks and miscellaneous hardware not listed in other categories. If you don’t see your part listed, contact us with the ESN or part number.
Cummins Engine Platforms We Support
Our parts inventory covers the full Cummins engine lineup manufactured by DCEC, CCEC, XCEC and BFCEC. Below are the major platforms organized by application. Click any engine model to view its specifications and supported parts.
🚛 Automotive / Truck
⚡ Generator Sets
🏗️ Industrial & Construction
- QSB3.9 — 110-130 HP
- QSB4.5 — 109-132 HP
- QSB5.9 — 130-210 HP
- QSB6.7 — 130-260 HP
- QSC8.3 — 215-260 HP
- QSL8.9 — 220-360 HP
- QSZ13 — 380-500 HP
- 4BT / 6BT / 6CT — Mechanical
- NT855 / K19 / K38 / K50
Genuine vs OEM vs Aftermarket Cummins Parts
When sourcing Cummins replacement parts, buyers typically choose between three quality tiers. The right choice depends on your application, budget and warranty requirements.
| Tier | Description | Best For | Price Level |
|---|---|---|---|
| Genuine Cummins | Manufactured by or for Cummins Inc., supplied in original Cummins/Fleetguard packaging with full factory warranty. Sourced from DCEC, CCEC, XCEC or BFCEC plants. | Engine under warranty, critical applications, emission-certified components (ECU, injectors, aftertreatment) | Highest — but guaranteed compatibility and resale value protection |
| OEM-Quality | Manufactured by the same Tier-1 suppliers that produce parts for Cummins assembly lines (e.g., Holset turbochargers, Fleetguard filters, Denso injectors), sold under the supplier’s own brand or as OEM-equivalent. | Routine maintenance, non-emission-critical components, budget-conscious fleets that demand OEM-grade reliability | 15-35% below genuine — same factory, different box |
| Aftermarket | Produced by independent manufacturers to OEM specifications. Quality varies significantly by supplier — we only source aftermarket parts from ISO/TS 16949-certified factories. | Older equipment out of warranty, high-wear consumables (gaskets, belts, filters), non-critical hardware | 30-60% below genuine — inspect quality carefully and choose reputable suppliers |
How to Identify the Correct Cummins Part
Ordering the wrong part is the most common — and most expensive — mistake in diesel engine maintenance. Cummins uses a structured part numbering system, and the most reliable way to identify the correct component is through the Engine Serial Number (ESN).
Step-by-Step Parts Identification
| # | Method | Details |
|---|---|---|
| 1 | Engine Serial Number (ESN) | The ESN is stamped on the engine dataplate (usually on the rocker lever cover, gear housing or cylinder block). It is the single most accurate identifier. Send us the ESN and we will cross-reference it against Cummins QuickServe parts catalogs to find every compatible part number. |
| 2 | Cummins Part Number (CPN) | If you have the old part, look for a 7- or 8-digit number stamped or etched on the component (e.g., 4991099, 3286278, 4921431). Some parts also carry a Bosch/Denso/Holset part number — both are valid for cross-referencing. |
| 3 | Engine Model + Arrangement Number | If the ESN is unreadable, provide the engine model (e.g., ISB5.9-210 40) and the arrangement/CPL (Control Parts List) number from the dataplate. This narrows the build specification but is less precise than the ESN. |
| 4 | Photograph the Dataplate | When in doubt, send clear photos of the engine dataplate and the old part itself. Our technical team can visually identify the component and confirm the correct replacement. |
For more information on Cummins fuel system components and maintenance procedures, refer to our detailed guide: Cummins PT Fuel System: Complete Maintenance & Troubleshooting Guide.
Top 10 Most Commonly Replaced Cummins Parts
Based on global demand data from maintenance, repair and overhaul (MRO) operations, these ten components account for the majority of Cummins parts purchases worldwide.
| # | Part | Function | Common Failure Signs |
|---|---|---|---|
| 1 | Fuel Injectors | Precisely atomize and deliver fuel into the combustion chamber at pressures up to 1,800-2,400 bar on modern common rail systems. | Hard starting, power loss, black smoke, increased fuel consumption, rough idle, cylinder imbalance codes |
| 2 | Turbocharger | Compresses intake air to increase engine power output. Holset turbos spin at up to 150,000+ RPM under exhaust gas temperatures exceeding 700°C. | Loss of boost pressure, whistling or siren noises, oil in intake piping, excessive black smoke, visible shaft play |
| 3 | Fuel Pump (HPFP) | Generates high fuel pressure for common rail injection systems. Includes Bosch CP3, Denso HP3/HP4 and Cummins XPI/CAPs pumps. | Hard starting, unstable idle, power fluctuation, low rail pressure fault codes, fuel in oil |
| 4 | Water Pump | Circulates coolant through the engine block, radiator and oil cooler to maintain operating temperature. | Coolant leaks from weep hole, engine overheating, grinding noise from front of engine, temperature fluctuation |
| 5 | Filter Kits | Fuel filters, oil filters and air filters remove contaminants that cause abrasive wear to injectors, bearings and cylinder liners. | Replaced on schedule (preventive maintenance), not after failure. Clogged filters cause power loss and poor fuel economy. |
| 6 | Starter Motor | Engages the flywheel ring gear to crank the engine. Available in 12V and 24V configurations with 4-9 kW output depending on engine size. | Clicking without cranking, slow cranking, intermittent no-start, grinding noise, burned solenoid smell |
| 7 | Alternator | Charges the battery and powers electrical systems during engine operation. Typical ratings: 35A to 140A depending on application. | Battery warning light, dead battery despite replacement, dimming lights, electrical instability, bearing noise |
| 8 | Engine Sensors | Monitor oil pressure, coolant temperature, intake pressure, crank position and exhaust gas parameters. Sensors feed real-time data to the ECU. | Check engine light, fault codes, random derating/shutdown, inconsistent gauge readings, poor throttle response |
| 9 | Piston & Ring Kit | Compress the air-fuel mixture and transfer combustion force to the crankshaft. Rings seal compression and control oil. | Increased oil consumption, blow-by gases from breather, compression loss, reduced power, blue smoke (oil burning) |
| 10 | Gaskets & Seals | Prevent fluid leaks and maintain pressure across all engine joints — head gasket, oil pan, valve cover, front/rear crank seals, intake/exhaust manifolds. | Visible oil or coolant leaks, oil in coolant, pressure loss, white smoke from coolant in combustion chamber, external seepage |
Source: Industry MRO demand data; failure sign descriptions based on common Cummins service bulletins and diagnostic manuals.
Recommended Maintenance & Replacement Intervals
Preventive maintenance with genuine or OEM-quality parts is the most cost-effective way to maximize Cummins engine life. Below are typical service intervals for the most frequently replaced components. Always follow the specific maintenance schedule in your engine’s operation manual.
| Component | Typical Interval | Notes |
|---|---|---|
| Engine Oil & Oil Filter | 250-500 hours / 10,000-25,000 km | Use CH-4/CI-4/CJ-4 grade diesel oil. Shorter intervals in dusty or high-load conditions. |
| Fuel Filter(s) | 250-500 hours | Always replace both primary and secondary filters together. Bleed air after replacement. |
| Air Filter | 500-1,000 hours (inspect every service) | Replace when restriction indicator triggers. Do not blow out paper filters with compressed air. |
| Coolant / Water Filter | 2,000-4,000 hours / 2 years | Use DCA4 or equivalent DCA additive. Replace water filter (WF2073) at every coolant change. |
| V-Belts / Serpentine Belt | 1,000-2,000 hours / 2-3 years | Inspect for cracking, glazing and fraying at every oil change. Replace tensioner with belt on high-hour engines. |
| Valve Lash Adjustment | 2,000 hours / first service at 1,000 km | Critical for mechanical B/C/N/K series. Electronically controlled ISB/ISDe/QSB series require less frequent adjustment. |
| Fuel Injector Inspection | 4,000-6,000 hours | Balance rates and return flow tested via INSITE diagnostic tool. Replace individual injectors as needed. |
| Turbocharger Inspection | 6,000 hours | Check shaft play, oil in intercooler piping and wastegate/VGT actuator function. |
| Major Overhaul | 15,000-30,000 hours / B10 life | B10 life varies by platform: ISB5.9 ~600,000 km, ISDe6.7 ~1,000,000 km, ISZ13 ~1,600,000 km. Overhaul includes piston/ring kit, bearings, gaskets, valves and liners as needed. |
Industries & Applications
Cummins diesel engines power a remarkably diverse range of equipment worldwide. We supply parts to customers across all major sectors:
🚛 Commercial Vehicles & Trucking
Heavy-duty trucks, tractor-trailers, dump trucks, cement mixers, buses and coaches powered by ISB, ISDe, ISC, ISL, ISLe and ISZ engines. Parts for daily-driving fleets where uptime directly impacts revenue.
🏗️ Construction & Mining
Excavators, bulldozers, wheel loaders, motor graders, cranes, forklifts and drilling rigs using QSB, QSC, QSL, QSM, NTA855 and K-series engines in high-dust, high-vibration environments.
⚡ Power Generation
Diesel generator sets for data centers, hospitals, factories, construction sites, telecom towers and marine applications. B3.9-G through Z13-G platforms covering 24 kW to 415 kW prime and standby power.
🚢 Marine & Agriculture
Fishing vessels, cargo boats, offshore support vessels, irrigation pumps, tractors and harvesters. Cummins 6BT, 6CT, NTA855 and K19/K38 engines are widely used in marine propulsion and auxiliary power.
Learn more about the industries we serve on our Industries page.
Why Choose BLSH Diesel as Your Cummins Parts Supplier
- Comprehensive inventory: 10,000+ SKUs in stock covering 30+ Cummins engine platforms from 3.9L to 50L displacement. We carry both high-turnover consumables (filters, belts, gaskets) and low-frequency core components (crankshafts, cylinder blocks, turbochargers).
- Direct from Cummins JV plants: We source genuine parts directly from DCEC, CCEC, XCEC and BFCEC — the four major Cummins manufacturing joint ventures in China. This eliminates middleman markups and ensures authentic, traceable components.
- ESN-based precision matching: Our technical team uses Cummins QuickServe and ESN cross-referencing to identify the exact part number for your specific engine build. No guesswork, no wrong parts, no costly returns.
- Flexible quality tiers: Choose genuine Cummins, OEM-equivalent or certified aftermarket based on your budget and application. We provide honest recommendations — we never sell unbranded knock-off electronic components.
- Global logistics: Express air freight (DHL/FedEx/UPS) for urgent orders with typical 5-10 day delivery worldwide, plus economical sea freight for bulk shipments and overhaul kits. We handle export documentation and packaging.
- Technical support: Our engineers provide pre-sale part identification, post-sale installation guidance and troubleshooting support. We understand Cummins engines — not just part numbers.
- Competitive B2B pricing: Wholesale pricing for fleet operators, equipment dealers and repair workshops. Volume discounts on filter kits, overhaul gasket sets and recurring maintenance parts.
Ready to Order Cummins Engine Parts?
Send us your Engine Serial Number (ESN), part number or engine model — get a quote within 24 hours.
Email: [email protected]
Frequently Asked Questions
How do I find my Cummins Engine Serial Number (ESN)?
The ESN is stamped on the engine dataplate, typically located on the rocker lever cover (valve cover), gear housing, or cylinder block side. It consists of eight digits (e.g., 73000000 series for DCEC engines). On electronically controlled engines, the ESN can also be read through the INSITE diagnostic tool. If you cannot locate the dataplate, send us clear photos of the engine and we will help identify it.
What is the difference between genuine, OEM and aftermarket Cummins parts?
Genuine parts are manufactured for Cummins and sold in Cummins/Fleetguard packaging with factory warranty. OEM parts are made by the same Tier-1 suppliers (such as Holset for turbochargers, Denso for injectors, Fleetguard for filters) but sold under their own brand — same factory and specifications, typically 15-35% cheaper. Aftermarket parts are made by independent manufacturers; quality varies, so always verify ISO/TS 16949 certification and supplier reputation. We recommend genuine or OEM for electronic and emission-critical components.
Can you supply parts for older mechanical Cummins engines like the 4BT, 6BT and NT855?
Yes. We maintain extensive inventory for legacy mechanical platforms including 4BT3.9, 6BT5.9, 6CT8.3, 6LT8.9, NTA855, KTA19, KTA38 and KTA50. Many of these engines remain in service globally, and the B-series in particular benefits from an enormous installed base and 80% parts commonality between mechanical and electronic versions.
How long does shipping take?
Express air freight via DHL, FedEx or UPS typically delivers within 5-10 business days to most countries. Sea freight for bulk orders takes 15-45 days depending on destination port. Production and preparation time is 7-30 business days depending on stock availability and order size. We will provide a confirmed lead time with your quotation.
Do you provide warranty on Cummins engine parts?
Genuine Cummins parts carry the manufacturer’s standard warranty (typically 12 months from installation or 18 months from shipment). OEM-quality parts come with our supplier warranty (6-12 months). Aftermarket parts warranty varies by manufacturer — we disclose warranty terms with every quotation. Warranty does not cover improper installation, misapplication or damage from external causes.
What information do I need to request a quote?
To provide an accurate quote, please include: (1) engine model or ESN, (2) the Cummins part number if available, (3) quantity needed, (4)
