Upgrade your 11.1L 6D22 engine with our HT250 cast iron individual cylinder heads. OEM ME999901 replacement prevents thermal cracking in Fuso and Kobelco fleets
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Upgrade your heavy-duty 11.1L engine with our premium individual cylinder heads for the Mitsubishi 6D22/6D22T (OEM: ME999901 / ME051221). Manufactured from dense HT250 cast iron, these single-cylinder units prevent thermal cracking and gasket blowout in Fuso The Great trucks, Kobelco excavators, and marine applications. In stock for global export.
The Mitsubishi 6D22 and its turbocharged 6D22T variant are massive 11.1-liter diesel powerhouses designed for the most grueling industrial environments. From driving 30-ton Kobelco SK330 excavators and Kato mobile cranes to powering deep-sea marine vessels and Fuso commercial trucks, this engine is built for continuous, extreme workloads. To handle the immense cylinder pressures of an 11.1L block, Mitsubishi utilized a highly specialized architecture: individual cylinder heads. Instead of one long casting, the engine uses six separate heads. While this allows for superior localized clamping force and easier single-cylinder maintenance, it also means each head must endure intense, concentrated thermal stress. Over time, this extreme heat often leads to fatigue cracking between the exhaust valve seat and the direct-injection port, causing devastating compression loss.
Ruich Value has engineered the ME999901 replacement head to directly combat this thermal vulnerability. We cast our individual cylinder heads using an upgraded HT250-grade high-density iron alloy. This superior metallurgy dramatically increases heat dissipation around the critical exhaust and injector bridge areas, neutralizing the micro-cracking cycle. Each individual casting is precision-machined to an absolute deck flatness tolerance of ≤ 0.05 mm, ensuring that when torqued down, it provides an impenetrable seal against the engine block. Backed by rigorous 3MPa air and water pressure testing, our 6D22 heads deliver the uncompromising durability required by global heavy-duty fleet operators.
| OEM Part Number | ME999901 |
|---|---|
| Cross Reference | ME051221, ME051714 |
| Engine Compatibility | Mitsubishi 6D22, 6D22T (11.1L Heavy Diesel) |
| Head Assembly Type | Individual Bare Cylinder Head (1 Head per Cylinder) |
| Material Grade | High-Density Cast Iron (HT250 / G3000 Grade) |
| Valve Configuration | 2-Valve OHV per individual head |
| Combustion System | Direct Injection (DI) |
| Deck Flatness Tolerance | ≤ 0.05 mm |
| Quality Assurance | 3MPa Air & Water Pressure Tested |
| OEM Brand | Application Category | Known Compatible Models |
|---|---|---|
| Mitsubishi Fuso | Heavy Commercial Trucks | Fuso “The Great” (FP, FS, FV series heavy-duty trucks) |
| Kobelco | Heavy Crawler Excavators | SK300, SK330, SK330LC (Verify 6D22 code) |
| Kato / Tadano | Heavy Mobile Cranes | Various 30-to-50 ton rough terrain and truck cranes |
| Marine & Industrial | Propulsion & Generators | Heavy-duty marine propulsion, tugboats, stationary gensets |
From individual 6D22 cylinder heads to massive 8DC9 V8 crankshafts, Ruich Value is the global factory-direct source for premium aftermarket heavy-duty engine parts. Explore our inventory below.
| Engine Model | OEM / AMC Number | Application (Vehicle & Equipment) |
|---|---|---|
| 4D30 / 4D30A | ME997041, ME012131 | Fuso Canter (3.3L Diesel), Old Canter FE Series |
| 4D31 | ME999863, ME017154 | Fuso Canter, Kato HD400 Excavator |
| 4D32 | ME997277, 22100-45101 | Fuso Canter FE335 (Direct Injection) |
| 4D33 | ME996449, ME997425 | Fuso Canter FE537, FE637 (4.2L) |
| 4D34 / 4D34T | ME997519, ME990753 | Fuso Canter FE449, Rosa Bus, Kobelco SK120 |
| 4D35 | ME202620 | Fuso Canter 4.6L |
| 4D56 (908 512) | MD185926, MD109736 | Protruding Valves: L200 K74, Pajero Sport (Early) |
| 4D56 (908 513) | MD348983, MD303750 | Recessed Valves: L200, Hyundai H100/H1 (D4BH) |
| 4D56U (16V) | 1005A560, 1005B453 | DOHC Common Rail: L200 Triton KA4T, Pajero Sport |
| 4DR7 | ME999127 | Mitsubishi Canter (Vintage), Jeep J54 |
| 4G63 / 4G64 (8V) | MD099086, MD305479 | Mitsubishi Forklift FG20/FG25, L300 Van, Delica |
| 4G54 / G54B | MD026520, MD311828 | Pajero V32, Forklift FG30 |
| 4M40 / 4M40T | ME202620, ME193804 | Pajero V46, Delica, Challenger, Canter (2.8L) |
| 4M41 | ME204200 (Old), 1005B341 (New) | Pajero V78 (3.2L DI-D), Triton ML/MN |
| 4M42 | ME204399, ME194151 | Fuso Canter FE7 (3.0L Common Rail) |
| S4S | 32A01-01010 | Mitsubishi Forklift FD30N, CAT Skid Steer |
| S6S | 32B01-01010 | Mitsubishi Forklift FD50, Hyundai Excavator R140 |
| 6D14 / 6D15 | ME031602, ME999602 | Fuso Fighter (Medium Duty), Kato/Tadano Cranes |
| 6D16 / 6D16T | ME997756, ME403382 | Fuso Fighter Truck, Kobelco SK330, Kato HD1430 |
| 6D22 / 6D22T | ME999664, ME051222 | Fuso Super Great, Kato NK-500E Crane |
| 6D34 | ME081734 | Fuso Fighter, Kobelco SK200-8 Excavator |
| 6G72 (V6) | MD307678 (L), MD307677 (R) | Pajero V43, V33 (3.0L V6 Petrol) |
Discover our full selection in the Mitsubishi Heavy Parts Hub.
This is a hallmark of heavy-duty industrial engineering. On a massive 11.1L block, a single long cylinder head would be incredibly prone to thermal warping and gasket failure. Individual heads provide superior localized clamping force for the immense cylinder pressures. It also allows fleet operators to replace a single damaged head—saving massive downtime and costs—rather than replacing the entire top end.
In heavy marine or excavator applications, the engine runs under continuous, maximum load. This forces extreme exhaust gas temperatures through the Direct Injection (DI) port and exhaust valve. The thermal fatigue in this narrow metal bridge eventually causes it to crack. Our replacement heads use a higher-density HT250 iron casting with improved thermal conductivity to resist this specific failure.
Yes, they refer to the same individual cylinder head profile used across the 6D22 and 6D22T engine families. ME999901 is the primary aftermarket and OEM replacement number, while ME051221 is a common alternate casting reference found on earlier Fuso and Kobelco engines.
No, this specific SKU (ME999901) is for the bare individual casting. This allows rebuilders to inspect and transfer over existing valves and springs if they meet service limits, offering a cost-effective rebuild. However, we highly recommend replacing the valve stem seals and inspecting the valve guides during assembly.
We specialize in international wholesale. Each individual 6D22 head is coated in anti-rust oil, wrapped in a VCI corrosion-barrier bag, and securely packed. For bulk orders (e.g., sets of 6 or fleet orders), they are bolted into heavily reinforced, export-grade wooden crates to guarantee zero transit damage.
Partner with Ruich Value to secure reliable, factory-direct aftermarket engine components for your heavy excavators, marine vessels, and commercial truck fleets. Contact our export team today for wholesales pricing.
For Any Inquiries, please feel free to contact us, Our sales teams are always glad to support your business
