Mitsubishi Cylinder Head for Triton L200, CAT 320 & More | Wholesale

Q: Why is my Mitsubishi Triton 4D56 losing coolant with no visible external leak?

Answer: The 4D56 2.5L diesel pre-combustion chamber design is prone to hairline cracks between the chamber and valve seats. Diagnosis: Coolant enters the combustion chamber and exits as white smoke — often misdiagnosed as head gasket. Solution: Our replacement 4D56 heads use reinforced pre-combustion chamber inserts and are pressure-tested to 1.5× OE spec. Send engine code for pre-chamber reinforced match from 4D56, 4M40, 6D16T plus more Mitsubishi inventory.

Q: Is the CAT 320 S6K cylinder head the exact same as the Mitsubishi S6K?

Answer: The Caterpillar 320 excavator uses the Mitsubishi S6K / 6D16T engine block. The cylinder head casting is identical between CAT and Mitsubishi OEM — same valve layout, injector angle, and pre-chamber design. Solution: Our 6D16T/S6K heads are interchangeable for CAT 320D/E rebuilds. Confirm the casting number on your core (typically ME012345) and send to our team for OEM cross-reference.

Q: Can a warped Mitsubishi 4M40 aluminum head simply be skimmed (machined)?

Answer: Skimming is only viable if warpage is ≤ 0.05 mm and the head passes a 100 psi pressure test. Beyond that, the pre-combustion chamber inserts shift, causing irreversible compression loss. Solution: We recommend replacement over machining for 4M40 — our alloy iron castings eliminate warpage risk entirely. Send engine code and warpage measurement for replacement quote from 4D56, 4M40, 6D16T plus more Mitsubishi inventory.

Q: What are your wholesale terms for loaded Mitsubishi cylinder heads?

Answer: We provide factory-direct wholesale pricing for distributors and engine rebuilding centers. Standard payment is via T/T or L/C. Loaded heads include new valves, springs, retainers, stem seals, and rocker assemblies pre-torqued to OE spec. All units are coated in anti-rust oil, sealed in VCI paper, and shipped in reinforced wooden crates — sea freight LCL/FCL globally within 15-30 days.

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Mitsubishi Cylinder Heads for 4D56, 4M40, 6D16T Engines — Triton, L200 plus more

Quick Summary: Mitsubishi Cylinder Heads

Mitsubishi cylinder heads for 4D56, 4M40, 6D16T — pre-chamber reinforced, pressure-tested castings stop cracking. Plus more Mitsubishi engines from Ruich Value.

Metallurgical Precision: Top-End Reliability for Mitsubishi Engines

Mitsubishi’s engineering footprint spans from rally-proven 4×4 platforms to the harshest heavy-industrial excavation sites. The cylinder head is the critical barrier managing this intense combustion pressure and thermal load. Ruich Value resolves top-end bottlenecks with a wholesale inventory of high-strength Mitsubishi Cylinder Heads. Whether you are replacing a cracked aluminum head on a Mitsubishi Pajero (4M40) or overhauling the heavy-duty cast-iron block of a CAT 320 excavator (S6K), our castings provide the structural integrity needed to withstand massive exhaust gas temperatures. Legendary diesel engines like the 4D56 (used in the Triton/L200) are notorious for developing micro-cracks between the valves or around the pre-combustion chambers under heavy towing loads. To combat this, our replacement cylinder heads are engineered with reinforced valve bridges and thicker water jacket walls. Every casting undergoes rigorous hydrostatic pressure testing to guarantee zero porosity, ensuring a perfect, leak-free seal even after thousands of hours of punishing industrial or off-road operation.

💡 Pro Tip: Integrated Engine Restoration

A cracked or warped cylinder head often results from overheating, which can compromise the entire engine. Ensure a warranty-grade rebuild by inspecting these related components in our catalog:

Mitsubishi Crankshafts (Coolant leaking from a cracked head will dilute the oil, destroying crankshaft main bearings)
Mitsubishi Turbochargers (Excessive exhaust gas temperatures that warp the head will also fry the turbo’s thrust bearings)
Mitsubishi Camshafts (A severely warped OHC head on a 4M40 will bind the camshaft, causing immediate valvetrain failure)
Mitsubishi Engine Gasket Kits (Always pair a new CNC-milled head with a premium Multi-Layer Steel (MLS) gasket for maximum compression sealing)

Mitsubishi Cylinder Head Replacement: Pre-Chamber Cracking, Warpage & Valve Bridge

Distributors and engine rebuilders sourcing Mitsubishi cylinder heads usually weigh these queries before quoting bulk orders:

mitsubishi 4d56 cylinder head crack (pre-combustion chamber failure)
mitsubishi 4m40 cylinder head warpage (Pajero overheating)
mitsubishi 6d16t cylinder head (CAT 320 excavator)
mitsubishi 4d34 cylinder head (Canter truck)
mitsubishi s6k cylinder head cat 320 interchange (S6K vs 6D16T)

Send engine code and existing OEM — we confirm Mitsubishi cylinder head from 4D56, 4M40, 6D16T plus more Mitsubishi inventory before quoting.

Technical Features of Ruich Value Mitsubishi Heads

Reinforced Pre-Chambers: For indirect injection diesels (like the classic 4D56), the pre-combustion chamber ports are thickened to prevent the notorious “spider cracking” that leads to coolant loss.
CNC Deck Milling: The mating surface is multi-axis CNC machined to a precise Ra finish, guaranteeing a flawless seal for high-compression turbocharged applications.
Upgraded Valve Seats: Sintered, hardened exhaust valve seats are installed to prevent valve recession in heavy-duty industrial S6K and S4S engines operating continuously at high RPMs.
Hydrostatic Testing: 100% of our bare and loaded castings are pressure tested at high temperatures to identify internal water jacket leaks before shipping.
Loaded Assembly Options: To minimize machine shop labor for fleet operators, we offer fully “Loaded” heads pre-assembled with valves, springs, retainers, and camshafts.

Available Mitsubishi Cylinder Head Catalog

Explore our extensive inventory of replacement engine heads below. We supply high-grade aluminum alloys for passenger/SUV platforms and dense cast-iron units for commercial trucks and excavators.

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)

Explore our complete Mitsubishi Engine Parts Catalog.

Compatible Equipment Models

Mitsubishi Cylinder Heads fit machinery including Mitsubishi Triton / L200 (4D56), Mitsubishi Pajero (4M40, 4M41), CAT 320B/320C Excavators (S6K / 3066), Fuso Canter Trucks (4D34, 4D32, 4M50), and Mitsubishi FD20-30 Forklifts (S4S). Contact us with your engine serial number for exact bare or loaded head match.

Technical Q&A: Mitsubishi Cylinder Heads

Why is my Mitsubishi Triton 4D56 losing coolant with no visible external leak?

Answer: The 4D56 2.5L diesel pre-combustion chamber design is prone to hairline cracks between the chamber and valve seats. Diagnosis: Coolant enters the combustion chamber and exits as white smoke — often misdiagnosed as head gasket. Solution: Our replacement 4D56 heads use reinforced pre-combustion chamber inserts and are pressure-tested to 1.5× OE spec. Send engine code for pre-chamber reinforced match from 4D56, 4M40, 6D16T plus more Mitsubishi inventory.

Is the CAT 320 S6K cylinder head the exact same as the Mitsubishi S6K?

Answer: The Caterpillar 320 excavator uses the Mitsubishi S6K / 6D16T engine block. The cylinder head casting is identical between CAT and Mitsubishi OEM — same valve layout, injector angle, and pre-chamber design. Solution: Our 6D16T/S6K heads are interchangeable for CAT 320D/E rebuilds. Confirm the casting number on your core (typically ME012345) and send to our team for OEM cross-reference.

Can a warped Mitsubishi 4M40 aluminum head simply be skimmed (machined)?

Answer: Skimming is only viable if warpage is ≤ 0.05 mm and the head passes a 100 psi pressure test. Beyond that, the pre-combustion chamber inserts shift, causing irreversible compression loss. Solution: We recommend replacement over machining for 4M40 — our alloy iron castings eliminate warpage risk entirely. Send engine code and warpage measurement for replacement quote from 4D56, 4M40, 6D16T plus more Mitsubishi inventory.

What are your wholesale terms for loaded Mitsubishi cylinder heads?

Answer: We provide factory-direct wholesale pricing for distributors and engine rebuilding centers. Standard payment is via T/T or L/C. Loaded heads include new valves, springs, retainers, stem seals, and rocker assemblies pre-torqued to OE spec. All units are coated in anti-rust oil, sealed in VCI paper, and shipped in reinforced wooden crates — sea freight LCL/FCL globally within 15-30 days.

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