Searching for a robust 4D56 cylinder head? Our MD303750 (AMC 908-512) for Mitsubishi L200 resists thermal cracking and deck warping. Factory wholesale pricing.
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Searching for a robust Mitsubishi 4D56 cylinder head replacement? This premium 8-valve assembly (OEM: MD303750 / AMC 908-512) is specifically engineered with high-density cast iron to cure thermal cracking between valve seats. It provides a permanent solution for Mitsubishi L200 (Triton), Pajero, and Delica fleets. Available for global wholesale export.
The Mitsubishi 4D56 2.5-liter engine is a cornerstone of global light commercial and 4WD heritage, powering the legendary Pajero and L200 pickup through the most demanding terrain. These engines reflect Mitsubishi’s legendary reliability and diesel powertrain expertise. However, in the 8-valve Indirect Injection (IDI) variants, high thermal loads and frequent towing can lead to a critical pain point: fatigue cracking between the valve seats. This stress, combined with cooling system pressure, often causes deck warping, leading to head gasket failure and immediate engine downtime.
Ruich Value addresses these specific 2.5L diesel vulnerabilities with our upgraded MD303750 cylinder head. Manufactured from superior HT250-grade cast iron, our heads offer vastly improved thermal stability to dissipate heat effectively in high-stress zones. By reinforcing the internal bridges between intake and exhaust ports, we’ve engineered a head that resists the micro-cracking common in original castings. With a precision-ground deck flatness tolerance of ≤ 0.05 mm, our cylinder heads ensure a permanent head-to-block seal, providing fleet owners and 4×4 enthusiasts with unyielding job-site reliability.
| OEM Part Number | MD303750 |
|---|---|
| AMC Reference | 908-512 |
| Engine Compatibility | Mitsubishi 4D56 (8-Valve 2.5L Diesel) |
| Head Assembly Type | Bare Cylinder Head Casting |
| Material Grade | High-Density Cast Iron (HT250 Grade) |
| Valve Configuration | 8-Valve SOHC / OHV (2 per cylinder) |
| Combustion System | Indirect Injection (IDI) with Swirl Chambers |
| Deck Flatness Tolerance | ≤ 0.05 mm |
| Quality Assurance | 3MPa Air & Water Pressure Tested |
| OEM Brand | Application Category | Known Compatible Models |
|---|---|---|
| Mitsubishi | 4WD Off-Road & SUV | Pajero, Montero, Shogun (1990-2008 8V models) |
| Mitsubishi | Commercial Pickup | L200 Triton (Early 2.5L 8V variants) |
| Mitsubishi | Light Commercial Van | Delica L300, L400 Series |
From workhorse 4D56 cylinder heads to heavy-duty industrial crankshafts, Ruich Value is the global commercial fleet source for premium aftermarket Mitsubishi engine components. Find the parts to complete your engine rebuilds 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 range of Mitsubishi Engine Parts.
It is vital not to mix these up: the MD303750 (AMC 908-512) is for the older 8-valve Indirect Injection (IDI) 4D56 engine. The 1100A135 is for the newer 16-valve Common-Rail (DI-D) 4D56U engine. They feature completely different valve counts, port designs, and injection systems and are not interchangeable.
High thermal stress is the culprit. In the 8V IDI design, the swirl chambers concentrate heat in the head casting. During long hill climbs or heavy towing, the metal bridge between the valves expands and contracts, eventually leading to fatigue fractures. Our high-density iron casting dissipates this heat more efficiently to resist this cycle.
The 4D56 uses torque-to-yield bolts. The standard sequence involves an initial torque of 30 Nm, followed by 105 Nm, then fully loosening and re-torquing to 30 Nm + 90 degrees + 90 degrees. Because of this stretch-to-clamp design, reusing old bolts will cause gasket failure. We strongly advise installing new bolts with every head replacement.
This MD303750 bare head casting is ready for swirl chamber installation. Depending on your specific model (non-turbo vs turbo), swirl chamber depths vary. We can provide the chambers pre-installed upon request, or you can transfer your existing ones if they are crack-free and within factory height specs.
Keep your 4WD fleets and commercial pickups on the road with engine parts engineered for unyielding durability. Contact Ruich Value today for factory-direct wholesale pricing on Mitsubishi 4D56 components.
For Any Inquiries, please feel free to contact us, Our sales teams are always glad to support your business