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

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

Symptom: Unexplained coolant loss, white exhaust smoke on startup, and overheating under load. Diagnosis: The 4D56 engine is prone to thermal cracking between the valve seats or around the pre-combustion chambers. When these micro-cracks open under operating temperatures, combustion pressure pressurizes the cooling system, pushing coolant out of the overflow. Solution: Replacing the head with our reinforced, thicker-cast 4D56 cylinder head permanently resolves this structural weakness.

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

Answer: Yes. The S6K is an industrial 6-cylinder diesel manufactured by Mitsubishi Heavy Industries, which Caterpillar rebranded as the CAT 3066 for their massively popular 320B and 320C excavators. Our S6K cast-iron cylinder heads are a direct bolt-on replacement for both Mitsubishi and Caterpillar-branded machinery, ensuring OEM-level heavy-duty performance.

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

Diagnosis: The 4M40 2.8L turbo-diesel in the Pajero uses an aluminum cylinder head with an overhead cam (OHC). Solution: If the engine overheated severely enough to warp the deck surface, skimming it will fix the gasket seal, but it will NOT align the camshaft journals. The camshaft will bind and snap. If a 4M40 head is warped beyond factory tolerances, it must be completely replaced with a new casting to preserve valvetrain geometry.

Reinforced Engine Heads for Mitsubishi 4×4, Commercial & Heavy Industrial Machinery

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Quick Summary: Mitsubishi Cylinder Heads

Wholesale Mitsubishi Cylinder Head – Resolve pre-combustion chamber cracking and thermal warpage. Our reinforced aluminum and high-density alloy iron castings fix the severe overheating failures common in 4D56 and 4M40 engines. Factory direct supply for Mitsubishi Triton L200, CAT 320 Excavators (S6K), Pajero, and More. Contact us for loaded assembly options and wholesale pricing.

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)

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 FAQ: Mitsubishi Cylinder Heads

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

Symptom: Unexplained coolant loss, white exhaust smoke on startup, and overheating under load. Diagnosis: The 4D56 engine is prone to thermal cracking between the valve seats or around the pre-combustion chambers. When these micro-cracks open under operating temperatures, combustion pressure pressurizes the cooling system, pushing coolant out of the overflow. Solution: Replacing the head with our reinforced, thicker-cast 4D56 cylinder head permanently resolves this structural weakness.

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

Answer: Yes. The S6K is an industrial 6-cylinder diesel manufactured by Mitsubishi Heavy Industries, which Caterpillar rebranded as the CAT 3066 for their massively popular 320B and 320C excavators. Our S6K cast-iron cylinder heads are a direct bolt-on replacement for both Mitsubishi and Caterpillar-branded machinery, ensuring OEM-level heavy-duty performance.

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

Diagnosis: The 4M40 2.8L turbo-diesel in the Pajero uses an aluminum cylinder head with an overhead cam (OHC). Solution: If the engine overheated severely enough to warp the deck surface, skimming it will fix the gasket seal, but it will NOT align the camshaft journals. The camshaft will bind and snap. If a 4M40 head is warped beyond factory tolerances, it must be completely replaced with a new casting to preserve valvetrain geometry.

What are your wholesale terms for loaded Mitsubishi cylinder heads?

We provide factory-direct wholesale pricing for engine rebuilders, 4×4 specialists, and heavy equipment distributors. Payments are accepted via T/T and L/C. Loaded cylinder heads are coated in anti-rust preventative and individually secured in export-grade wooden crates to protect the protruding valves during global transit. Air freight is available for urgent VOR (Vehicle Off Road) orders.

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