Upgrade your 2.5L 4D56 engine with our HT250 cast iron cylinder head. This MD185918 unit prevents thermal cracking in Pajero and L200 fleets. Factory wholesale
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Restore your 2.5L diesel engine with this premium Mitsubishi 4D56 cylinder head (OEM: MD185918). Engineered with high-density HT250 cast iron, it is designed to permanently eliminate the thermal cracking common in L200 Triton (K74T) pickups and Pajero V24/V44 SUVs. This unit features recessed valve seat specifications. In stock for immediate global wholesale export.
The Mitsubishi 4D56 is a cornerstone of global diesel heritage, powering decades of unbreakable Pajero 4x4s and versatile L200 work trucks. Reflecting Mitsubishi’s performance heritage and innovative engineering, the 8-valve Indirect Injection (IDI) 4D56 is celebrated for its mechanical simplicity. However, the high-heat cycles inherent in IDI swirl chamber combustion create a notorious pain point: thermal fatigue. In high-mileage fleets or heavy-towing applications, original castings frequently suffer from micro-cracking between the valve seats and catastrophic swirl chamber erosion, leading to immediate oil-in-coolant contamination and compression loss.
Ruich Value provides a definitive metallurgical fix for these high-stress environments. Our MD185918 replacement cylinder heads are manufactured using superior HT250-grade cast iron alloy. This material offers vastly improved thermal conductivity and structural density compared to standard aftermarket castings, allowing for more effective heat dissipation in the critical valve bridge zones. With a precision-machined deck flatness tolerance of ≤ 0.05 mm and mandatory 3MPa pressure testing, our cylinder heads ensure a permanent head-to-block seal, keeping your Mitsubishi commercial fleets and off-road vehicles operational in the most demanding climates.
| OEM Part Number | MD185918 |
|---|---|
| Engine Compatibility | Mitsubishi 4D56 (8-Valve 2.5L IDI Diesel) |
| Valve Seat Type | Recessed Valve Seats (Depressed Style) |
| Material Grade | High-Density Cast Iron (HT250 / G3000 Grade) |
| Valve Configuration | 8-Valve SOHC (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 | Target Models (8V Variants) |
|---|---|---|
| Mitsubishi | Pickup (L200) | L200 Triton K74T, L200 K34T (1990–2006) |
| Mitsubishi | SUV / 4×4 | Pajero V24, V44, Montero, Shogun, Pajero Sport |
| Mitsubishi | Minibus / Van | Delica L300, L400, Starex (Early 4D56 variants) |
From the legendary 4D56 to the modern 16V 4D56U, Ruich Value provides the industry’s most reliable aftermarket cylinder heads for global Mitsubishi fleets. Explore our comprehensive 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 more in our Mitsubishi Parts Hub.
This is a critical fitment detail. The MD185918 is a “Recessed” type head, where the valve faces sit slightly deeper into the deck. This must match your specific piston design. Using a flat-valve head on an engine designed for recessed valves can cause catastrophic valve-to-piston contact. Always verify the recess depth (typically 0.8mm to 2.5mm) of your old unit before ordering.
In the 4D56 IDI engine, the swirl chambers concentrate immense thermal energy. In heavy-duty logistics or towing, the metal bridge between the valves expands and contracts, leading to thermal fatigue cracks. Our HT250 cast iron provides superior heat dissipation to stop this cracking cycle.
The 4D56 uses torque-to-yield (TTY) bolts. The standard sequence is: initial torque to 30 Nm, then 105 Nm, then fully loosen and re-torque to 30 Nm + 90 degrees + 90 degrees. Reusing old head bolts will result in improper clamping force and certain gasket failure. Always install with a brand-new bolt set.
This specific SKU (MD185918) is for the bare cylinder head casting. While it is machined for swirl chamber inserts, the inserts are typically not pre-installed to allow for customization based on turbo vs. non-turbo glow plug requirements. However, we can supply complete head assemblies upon request for rapid fleet turnaround.
Partner with Ruich Value to secure reliable, factory-direct aftermarket engine components for your L200 Triton and Pajero fleets. Contact our global export team today for direct pricing and global shipping options.
For Any Inquiries, please feel free to contact us, Our sales teams are always glad to support your business