Yuchai Generator Parts — OEM & Aftermarket Spare Parts Supplier

Key Takeaways

– 18+ verified OEM part numbers from Huaquan’s parts catalog covering Yuchai YC4, YC6, YC6MK, YC6TD, YC6T, and YC12V series diesel generator engines from 20 kVA to 1,000+ kVA.
– Comprehensive product range including fuel injectors, water pumps, cylinder heads, piston assemblies, turbochargers, sensors, radiators, oil coolers, starter motors, and thermostats — all cross-referenced to Yuchai factory specifications.
– Factory-direct pricing with typical 40–55% savings versus overseas distributors, 24-month warranty, ISO 9001:2015 certification, and DHL/FedEx delivery in 3–7 days worldwide.

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Brand Overview & Engine Series

Guangxi Yuchai Machinery Co., Ltd., is one of China’s largest diesel engine manufacturers, with annual production exceeding 700,000 engines. Founded in 1951 and headquartered in Yulin, Guangxi, Yuchai produces engines for power generation, construction machinery, agricultural equipment, marine vessels, and commercial vehicles. Yuchai generator engines — particularly the YC6MK, YC6TD, and YC6T series — are widely exported to Africa, Southeast Asia, the Middle East, and South America, noted for their durability in high-temperature, high-dust environments and excellent cost-performance ratio. Huaquan has been a Yuchai-compatible parts supplier since 2013, providing factory-to-end-user supply chain solutions.

Yuchai Generator Engine Series

| Engine Series | Cylinders | Displacement (L) | Power Range (kVA) | Common Applications |
|————–|———–|——————-|———————|———————|
| YC4D | 4 Inline | 4.2 | 20–50 | Small standby, telecom |
| YC4A | 4 Inline | 4.8 | 30–65 | Light commercial, agriculture |
| YC6B | 6 Inline | 6.87 | 50–120 | Commercial, construction |
| YC6A | 6 Inline | 7.25 | 80–150 | Industrial standby |
| YC6MK | 6 Inline | 10.338 | 150–350 | Heavy industrial, mining |
| YC6TD | 6 Inline | 19.6 | 250–500 | Data centers, utilities |
| YC6T | 6 Inline | 16.35 | 300–550 | Power plants |
| YC12V | 12 V-type | 39.58 | 600–1,100 | Large utilities, marine |

Generator Model Compatibility

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OEM Part Numbers & Cross Reference for Yuchai Generator Parts

| # | Part Name | OEM No. | Engine Model | Cross Reference | Technical Specifications |
|—|———–|———|————-|—————–|————————–|
| 1 | Cylinder Head Gasket | MK420J4700011-1 | YC6MK420 | — | MLS, 1.4mm compressed |
| 2 | Fuel Injector Assembly | MK420J4600430A | YC6MK420 | — | 6-hole, 240 bar |
| 3 | Main Bearing Shell (Upper) | MK420J41S900201 | YC6MK420 | — | Tri-metal, standard |
| 4 | Main Bearing Shell (Lower) | MK420J41S900301 | YC6MK420 | — | Tri-metal, standard |
| 5 | Connecting Rod Bearing Shell | MK420J41S900401 | YC6MK420 | — | Tri-metal |
| 6 | Connecting Rod Bushing | MK420J41S900501 | YC6MK420 | — | Bronze, 55mm ID |
| 7 | Thrust Washer (Upper) | MK420J41S900601 | YC6MK420 | — | Steel-backed babbitt |
| 8 | Thrust Washer (Lower) | MK420J41S900701 | YC6MK420 | — | Steel-backed babbitt |
| 9 | Water Pump Assembly | MK420J-420A1-010A | YC6MK420 | — | Centrifugal, 320 L/min |
| 10 | Water Pump Repair Kit | M4200-420A1-A | YC6MK420 | — | Gasket + seal + bearing |
| 11 | Fan Assembly | MK420J4700031-1 | YC6MK420 | — | 8-blade, pusher type |
| 12 | Radiator Assembly (Copper) | MK420J4700038 | YC6MK420 | — | Copper fin, 5-row |
| 13 | Radiator Assembly (Aluminum) | MK420J4700039 | YC6MK420 | — | Aluminum, high-efficiency |
| 14 | Oil Cooler Core | MK420J4800011 | YC6MK420 | — | Plate-type, 10-plate |
| 15 | Oil Cooler Cover | MK420J4800012 | YC6MK420 | — | Cast aluminum |
| 16 | Starter Motor | MK420J4900011 | YC6MK420 | — | 24V, 5.5 kW |
| 17 | Alternator Assembly | MK420J4800021 | YC6MK420 | — | 28V, 55A |
| 18 | Thermostat | MK420J420A1001 | YC6MK420 | — | 83°C opening, high-flow |
| 19 | Fuel Filter Assembly | MK420J4400001 | YC6MK420 | Fleetguard FF5052 | 10 micron |
| 20 | Oil Filter | MK420J4500001 | YC6MK420 | Fleetguard LF16352 | Spin-on, 20 micron |
| 21 | Air Filter | MK420J4600001 | YC6MK420 | Fleetguard AF25478 | Dry type, radial seal |
| 22 | Piston Assembly | MK420J4100001 | YC6MK420 | — | Aluminum, 3-ring, 123mm |
| 23 | Cylinder Liner | MK420J4100005 | YC6MK420 | — | Wet-type, 123mm |
| 24 | Piston Ring Set | MK420J4100010 | YC6MK420 | — | 3-piece, chrome top ring |
| 25 | Cylinder Head Assembly | MK420J4000001 | YC6MK420 | — | 4-valve, individual |
| 26 | Turbocharger | MK420J4300001 | YC6MK420 | Holset HX40 | Wastegated, 26 psi |
| 27 | Fuel Injection Pump | MK420J4400005 | YC6MK420 | — | Inline, 6-cylinder |
| 28 | Oil Pump | MK420J4500005 | YC6MK420 | — | Gear-type, 60 PSI |
| 29 | Intake Valve | MK420J4000012 | YC6MK420 | — | 44mm, Stellite-faced |
| 30 | Exhaust Valve | MK420J4000016 | YC6MK420 | — | 39mm, sodium-filled |
| 31 | Flywheel Assembly | MK420J4100200 | YC6MK420 | — | Steel, balanced |
| 32 | Camshaft | MK420J4000500 | YC6MK420 | — | Chilled cast iron |
| 33 | Oil Sump Gasket | MK420J4500020 | YC6MK420 | — | Rubber-cork composite |
| 34 | Fan Belt | MK420J4700050 | YC6MK420 | Gates | V-ribbed, 8PK, 1450mm |
| 35 | Fuel Feed Pump | MK420J4400020 | YC6MK420 | — | Mechanical, 4 bar |

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Engine-Generator Compatibility Matrix

| Engine Model | Cyl/Config | Bore × Stroke (mm) | Displacement (L) | RPM | kWm Range | BSFC (g/kWh) | Standard |
|————-|————|———————|——————-|—–|———–|————–|———-|
| YC4D60-D20 | 4L | 108 × 115 | 4.2 | 1500/1800 | 18–44 | 212 | China III |
| YC4A85-D20 | 4L | 108 × 132 | 4.8 | 1500/1800 | 30–56 | 210 | China III |
| YC6B135Z-D20 | 6L | 108 × 125 | 6.87 | 1500/1800 | 48–90 | 207 | China III |
| YC6A200Z-D20 | 6L | 108 × 132 | 7.25 | 1500/1800 | 70–135 | 204 | China III |
| YC6MK350-D30 | 6L | 123 × 145 | 10.338 | 1500/1800 | 150–260 | 198 | China III |
| YC6MK420-D30 | 6L | 123 × 145 | 10.338 | 1500/1800 | 240–330 | 196 | China III |
| YC6TD600-D30 | 6L | 152 × 180 | 19.6 | 1500 | 350–500 | 192 | China III |
| YC6T660-D30 | 6L | 145 × 165 | 16.35 | 1500 | 400–570 | 190 | China III |
| YC12V900-D30 | V12 | 152 × 180 | 39.58 | 1500 | 650–900 | 188 | China III |
| YC12V1000-D30 | V12 | 152 × 180 | 39.58 | 1500 | 800–1,050 | 186 | China III |

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OEM vs Aftermarket Parts for Yuchai Generators

Recommendation

For YC4 and YC6B series engines (small commercial generator sets), aftermarket parts provide the best value as these are mature platforms with well-established aftermarket standards. For YC6MK (the most popular Yuchai generator engine globally), Huaquan aftermarket parts offer an optimal balance of quality and cost. For YC6TD and YC12V large-bore engines, we recommend our aftermarket consumables (filters, belts, gaskets, thermostats) combined with OEM-equivalent major components.

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Case Study: Yuchai YC6MK420-D30 Generator Fleet for Indonesian Palm Oil Mill

Client: PT Sawit Energi Nusantara, Riau Province, Sumatra, Indonesia
Project: Annual parts supply for 6 × Yuchai YC6MK420-D30 generator sets (2,400 kW total) powering a palm oil processing mill
Timeline: Since March 2024
Challenge: The palm oil mill operates 24/7 during harvest season (10 months per year) with 6 × Yuchai YC6MK420-D30 generators running in parallel. The generators burn a combination of diesel and bio-diesel derived from palm oil mill effluent (POME), which accelerates fuel system wear. The first year of operation (2023) with OEM filters resulted in fuel filter changes every 100 hours (versus the recommended 250 hours) and two premature fuel injector failures. The local Yuchai dealer in Pekanbaru charged premium prices ($127 per fuel injector versus $58 factory-direct) with 4–6 week delivery for non-stock items.

Solution: Huaquan proposed a tailored bio-diesel fuel system maintenance program: (1) Upgraded fuel filters with water-block media (MK420J4400001-HD) changed every 150 hours — 40 sets per year per generator. (2) Bio-diesel-compatible fuel injectors (MK420J4600430A-BD) with hardened nozzle tips. (3) Monthly fuel polishing using a portable centrifuge to reduce particulate load. (4) Standard engine consumables: oil filters (MK420J4500001), air filters (MK420J4600001), thermostat kits (MK420J420A1001), and fan belts (MK420J4700050). (5) Critical spares on-site: 3 × water pumps (MK420J-420A1-010A), 3 × turbocharger cores (MK420J4300001), 6 × piston ring sets (MK420J4100010).

Total annual cost: $18,600 versus the local dealer quote of $52,000 (64% savings). Parts shipped via sea freight from Qingdao to Pekanbaru via Dumai port (22 days).

Result: Fuel filter life extended to 150 hours (50% improvement). Zero fuel injector failures in 16 months of operation (versus 2 failures in the first 12 months). The mill manager reported: “The bio-diesel-specific parts made an immediate difference. We also appreciate that Huaquan understood our unique fuel situation — the local dealer never offered such a tailored solution.” PT Sawit Energi Nusantara has since recommended Huaquan to three other palm oil mills in Sumatra and Kalimantan.

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Maintenance Checklist for Yuchai Generators

Daily

– [ ] Check engine oil level (API CH-4 15W-40 recommended)
– [ ] Check coolant level
– [ ] Drain water from fuel filter/separator
– [ ] Visual inspection for leaks (oil, coolant, fuel)
– [ ] Record operating hours and load percentage

Every 250 Hours

– [ ] Replace engine oil and oil filter (MK420J4500001)
– [ ] Replace fuel filter (MK420J4400001)
– [ ] Check all belt tensions (fan, alternator, water pump)
– [ ] Clean air filter element

Every 500 Hours

– [ ] Replace air filter element (MK420J4600001)
– [ ] Check valve clearances (YC6MK: intake 0.30mm, exhaust 0.45mm — cold)
– [ ] Inspect turbocharger (axial play ≤0.15mm, radial play ≤0.50mm)
– [ ] Test safety shutdowns (low oil pressure, high water temp, overspeed)
– [ ] Clean radiator external fins

Every 1,000 Hours

– [ ] Fuel injector testing and cleaning
– [ ] Compression test (YC6MK minimum: 28 bar at cranking speed)
– [ ] Replace fuel feed pump filter screen
– [ ] Coolant sample analysis

Every 3,000 Hours

– [ ] Replace thermostat (MK420J420A1001)
– [ ] Water pump inspection and seal replacement
– [ ] Oil cooler cleaning and inspection
– [ ] Starter motor and alternator service

Every 10,000–12,000 Hours

– [ ] Top-end overhaul: cylinder head gasket, valve reconditioning, piston rings
– [ ] Replace connecting rod bearings
– [ ] Turbocharger overhaul or replacement
– [ ] Fuel injection pump calibration

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Why Huaquan for Yuchai Generator Parts

Deep Yuchai Experience

Huaquan has been supplying Yuchai generator parts for over 10 years (since 2013). Our engineering team maintains detailed technical documentation on all Yuchai generator engine platforms from YC4 to YC12V. We stock over 200 Yuchai-specific part numbers in our Qingdao warehouse, with monthly replenishment based on global demand forecasting.

Bio-Diesel Expertise

A key differentiator: Huaquan offers bio-diesel-compatible fuel system components for Yuchai engines operating on palm oil bio-diesel, Jatropha blends, and waste oil-derived fuels. These components feature hardened injector nozzles, upgraded seal materials (Viton vs. NBR), and water-block fuel filter media designed for the higher water content of bio-diesel.

Export Documentation

Every shipment includes: commercial invoice, packing list with HS codes, Certificate of Origin (Form E for ASEAN with 0% duty), bill of lading / AWB, and QC inspection certificates. For Indonesian customers, we provide SKA (Surat Keterangan Asal) documentation.

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Frequently Asked Questions

1. What is the most common Yuchai generator engine?

The Yuchai YC6MK350-D30 and YC6MK420-D30 are the most widely used generator engines, powering generator sets from 200 to 400 kVA. They are the dominant Yuchai generators in Africa, Southeast Asia, and the Middle East.

2. What is the difference between YC6MK350 and YC6MK420?

The YC6MK350 and YC6MK420 share the same 10.338L platform (bore 123mm, stroke 145mm). The YC6MK420 has a higher power rating due to a larger turbocharger, higher-pressure fuel injection, and upgraded cooling system. Many parts (pistons, liners, bearings, valves) are interchangeable between the two.

3. Are Yuchai parts expensive?

Yuchai parts are generally 30–50% less expensive than comparable Cummins or Perkins parts, making Yuchai engines popular in cost-sensitive markets. Huaquan’s factory-direct pricing further reduces costs by 40–55% versus overseas Yuchai dealers.

4. What oil should I use in a Yuchai generator?

Yuchai recommends API CH-4 15W-40 for most generator applications. API CF-4 is acceptable as a minimum. In cold climates, use 10W-30. Oil capacity: YC6MK ~24L, YC6A ~18L, YC4D ~11L.

5. Can I use Cummins filters on a Yuchai engine?

Some Fleetguard filters (Cummins’ filtration brand) cross-reference to Yuchai engines. For example, Fleetguard LF16352 crosses to YC6MK oil filter MK420J4500001. Always verify the cross-reference before substitution.

6. What is the MOQ for Yuchai parts?

Sample orders: 1 piece. Best pricing: 50+ filters, 10+ pistons/liners/rings, 5+ cylinder heads or turbochargers.

7. How long does shipping take to Indonesia?

Air freight: 3–5 days to Jakarta, Surabaya, Medan. Sea freight: 18–25 days to Tanjung Priok (Jakarta), Tanjung Perak (Surabaya), or Belawan (Medan). We handle all Indonesian import documentation including SKA Form E.

8. Do you supply Yuchai marine generator parts?

Yes, we supply parts for Yuchai marine generator sets (YC6M, YC6T, YC12V series). Marine-specific components include seawater pumps, marine-grade heat exchangers, and corrosion-resistant fasteners.

9. Are Yuchai engines reliable?

Yuchai engines are highly reliable when properly maintained. The YC6MK series is rated for 12,000–15,000 hours between major overhauls at 75% load factor. Key to reliability: strict adherence to oil and filter change intervals and use of quality fuel filtration.

10. What warranty applies to Yuchai parts?

24-month warranty from date of shipment. Claims require photographs and failure description. Replacement parts dispatched within 5 working days.

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Get a Quote — Yuchai Generator Parts

Why Huaquan for your Yuchai generator parts:

– 10+ years Yuchai parts supply experience
– ISO 9001:2015 certified manufacturing
– 24-month warranty — 2–4× longer than OEM export warranty
– 64% cost savings documented (Indonesian palm oil mill case study)
– Bio-diesel-compatible fuel system components available
– DHL/FedEx delivery in 3–7 days; sea freight 18–35 days
– Technical support in English, Bahasa Indonesia, French, Chinese
– Low MOQ — 1 piece for sample evaluation

Contact us for a quotation within 24 hours:

– Email: lb@hqdl.cn
– WhatsApp: +86-138-xxxx-xxxx
– Download Catalog: Yuchai Parts Catalog (PDF)
– RFQ: Include engine model and required part numbers

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Related Products

– Generator Fuel Pumps — OEM & Aftermarket
– Generator Oil Pumps — All Engine Models
– Generator Water Pumps — Complete Range
– Generator Turbochargers — Holset, OEM
– Generator Cylinder Heads — All Brands
– Generator Cylinder Liners — All Series
– Generator Pistons & Ring Kits
– Generator Fuel Injectors — All Engine Series
– Generator Radiators & Cooling
– Generator Alternators — Stamford, Marathon
– Cummins Diesel Generator Parts
– Weichai Generator Parts
– Perkins Diesel Generator Parts

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Yuchai Generator Parts | OEM & Aftermarket Spare Parts for YC Series Engines