Mitsubishi Camshaft for 4D56 & 4M40 Engines - 4x4 & Industrial

Q: Why did the camshaft snap in half on my Mitsubishi Pajero 4M40?

Symptom: Sudden, catastrophic engine failure with loud upper-engine clatter. Diagnosis: The 4M40 2.8L diesel utilizes an aluminum cylinder head with an overhead camshaft. If the engine overheats, the long aluminum head warps. Because the camshaft is rigid steel, the warped head bends the cam journals out of alignment. As the engine turns, the immense bending stress causes the camshaft to snap cleanly in half. Solution: You cannot just replace the camshaft. You must replace (or perfectly machine) the cylinder head alongside our heavy-duty replacement camshaft to restore straight geometry.

Q: Why are the lobes flattening on my Triton 4D56 camshaft?

Diagnosis: The classic 4D56 utilizes a rocker arm valvetrain. If oil maintenance is neglected, the small roller/slider pads on the rocker arms seize. Instead of gliding, they grind directly into the cam lobe, destroying the hardened surface in thousands of miles. Solution: We strongly advise replacing all Rocker Arms when installing our HRC 60 induction-hardened replacement 4D56 camshaft to prevent repeat failures.

Q: Does the Mitsubishi S6K camshaft fit the CAT 320 excavator?

Answer: Yes. Mitsubishi Heavy Industries designed and manufactured the 6-cylinder S6K engine, which Caterpillar adopted and rebranded as the CAT 3066 for their massively popular 320-series excavators. Our S6K replacement camshafts are a direct, OEM-spec drop-in for both Mitsubishi and CAT-branded heavy machinery.

Induction-Hardened Engine Cams for Mitsubishi Commercial & Heavy Industrial Machinery

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Quick Summary: Mitsubishi Camshafts

Wholesale Mitsubishi Camshafts for Mitsubishi Triton L200, CAT 320 Excavators, and Pajero SUVs. Our replacement engine cams are induction-hardened to HRC 58-62 to permanently resolve 4D56 lobe flattening and 4M40 snapping failures. Factory direct supply ensures precision valve overlap and extreme wear resistance for 4×4 and industrial fleets. Contact us for bulk pricing and comprehensive valvetrain coverage.

Metallurgical Endurance: Valvetrain Reliability for Mitsubishi Engines

Mitsubishi’s engineering DNA is defined by its rally-proven 4×4 heritage and its dominance in heavy industrial equipment. The camshaft is the critical conductor of this power, dictating engine breathing and combustion timing. Ruich Value resolves critical top-end maintenance bottlenecks with a wholesale inventory of high-precision Mitsubishi Camshafts. Whether you are servicing an overhead-cam (OHC) Mitsubishi Triton (4D56) or rebuilding the heavy-duty gear-driven valvetrain in a CAT 320 excavator (S6K), our camshafts deliver the exact metallurgical hardness required to sustain millions of high-torque cycles. Despite their rugged reputation, Mitsubishi OHC diesel engines like the 4M40 and 4D56 are highly susceptible to valvetrain failures. Poor lubrication causes severe lobe pitting, while warped cylinder heads frequently cause the rigid camshaft to snap in half. Our replacement camshafts are manufactured from Forged Steel or premium Chilled Cast Iron. By utilizing advanced induction hardening on the lobes and micro-polishing the bearing journals, we create a valvetrain assembly that aggressively resists frictional wear and prevents premature snapping under heavy payloads.

💡 Pro Tip: Integrated Valvetrain Restoration

A damaged camshaft rarely fails in isolation. It scatters metal shavings and is often the victim of other top-end failures. To ensure a warranty-grade rebuild, we strongly recommend cross-referencing your order with these genuine-spec components:

Mitsubishi Cylinder Heads (A warped 4M40 cylinder head will misalign the cam journals, causing your new camshaft to snap instantly upon startup)
Mitsubishi Crankshafts (Vital for achieving perfect bottom-to-top end synchronization via the timing belt or gear train)
Mitsubishi Rocker Arms & Followers (Always replace cam followers when installing a new camshaft; old, seized rollers will destroy the new HRC 60 hardened lobes in minutes)
Mitsubishi Turbochargers (A worn exhaust cam lobe alters valve timing, drastically reducing exhaust gas velocity and crippling turbo spool-up)

Technical Features of Ruich Value Mitsubishi Camshafts

Induction Hardening: Cam lobes are treated to HRC 58-62, providing a massive increase in surface wear resistance to combat the severe flattening commonly seen in high-mileage 4D56 engines.
Micro-Polished Journals: Bearing journals are CNC ground to an Ra 0.2 finish, ensuring a perfect hydrodynamic oil film that prevents metal-to-metal journal scoring during cold starts.
Exact OEM Profiles: Machined to precise Mitsubishi lift and duration specifications, ensuring correct valve overlap, optimal compression, and factory-level emissions compliance.
Gear Mesh Precision: For gear-driven applications (like the industrial S6K and S4S), helical gears are cut to exact tolerances, preventing gear whine and timing backlash in heavy-duty excavators and forklifts.
Wholesale Availability: We maintain a large stock of fast-moving OHC and OHV shafts, supporting urgent rebuilds for global Triton and Fuso truck fleet operators.

Available Mitsubishi Camshaft Catalog

Explore our comprehensive catalog of replacement Engine Cams. If you require matching rocker assemblies or specific industrial engine series, please consult our technical sales team.

Engine Model	OEM Part No.	Main Applications
4D56 / 4D56T / D4BH	MD137163 24110-42200 (Hyundai) 24110-42501	Mitsubishi L200 (K74), Pajero, Delica, Hyundai H100, Galloper
4D55 (Old Type)	MD050140	Mitsubishi Pajero (L043), Early L200
4D56U (16V / DI-D)	1015A524 (Inlet)	Mitsubishi L200 Triton (KA4T/KB4T), Pajero Sport
4M40 / 4M40T	ME200691 ME201701 ME204053	Mitsubishi Pajero V46, Delica Space Gear, Canter Truck
4G63 / 4G63B	MD073744 MD040760 MD131485	Mitsubishi Forklift (FG20/FG25), L300 Van, Galant
6G72 (12V)	MD145656 (LH) MD145655 (RH)	Mitsubishi Pajero V33, Montero V6, Hyundai Sonata V6
4G54 / 4G54B	MD023160 MD023151	Mitsubishi Pajero V32, Forklift, Chrysler K-Cars
4G64 (8V)	MD336984	Mitsubishi Galant, Space Wagon, Forklift
4G13 / 4G15	MD325779 24100-24500	Mitsubishi Lancer, Colt, Proton Saga
4D31 / 4D31T	ME017266 (Turbo) ME013676	Mitsubishi Fuso Canter, Rosa Bus, Kato Crane
4D32	ME011895	Mitsubishi Fuso Canter, Industrial Generators
4D34 / 4D34T	ME013677	Fuso Canter (Newer Models), Kobelco Excavators
6D14 / 6D15	ME071613 (6D14) ME170477 (6D15)	Fuso Fighter Truck, Mobile Cranes
6D16 / 6D16T	ME170148	Fuso Fighter Truck, Kobelco SK330 Excavator
6D22 / 6D22T	ME051209	Fuso Super Great, Kato/Tadano Crane
6D31 / 6D34	ME081645 / ME081737	Kobelco SK200-8 Excavator (6D34)
8DC8 / 8DC9	ME081737	Mitsubishi Fuso Heavy Dump Truck
S4S / S6S	(Check Casting)	Mitsubishi / CAT Forklifts (3-5 Ton)

Explore our complete Mitsubishi Engine Parts Catalog.

Compatible Equipment Models

Mitsubishi Camshafts fit machinery including Mitsubishi Triton / L200 (4D56), Mitsubishi Pajero (4M40, 4M41), CAT 320B/320C Excavators (S6K / 3066), Fuso Canter Trucks (4D34, 4M50), and Mitsubishi Forklifts (S4S). Contact us to verify exact valve timing specifications and engine fitment.

Technical FAQ: Mitsubishi Camshafts

Why did the camshaft snap in half on my Mitsubishi Pajero 4M40?

Symptom: Sudden, catastrophic engine failure with loud upper-engine clatter. Diagnosis: The 4M40 2.8L diesel utilizes an aluminum cylinder head with an overhead camshaft. If the engine overheats, the long aluminum head warps. Because the camshaft is rigid steel, the warped head bends the cam journals out of alignment. As the engine turns, the immense bending stress causes the camshaft to snap cleanly in half. Solution: You cannot just replace the camshaft. You must replace (or perfectly machine) the cylinder head alongside our heavy-duty replacement camshaft to restore straight geometry.

Why are the lobes flattening on my Triton 4D56 camshaft?

Diagnosis: The classic 4D56 utilizes a rocker arm valvetrain. If oil maintenance is neglected, the small roller/slider pads on the rocker arms seize. Instead of gliding, they grind directly into the cam lobe, destroying the hardened surface in thousands of miles. Solution: We strongly advise replacing all Rocker Arms when installing our HRC 60 induction-hardened replacement 4D56 camshaft to prevent repeat failures.

Does the Mitsubishi S6K camshaft fit the CAT 320 excavator?

Answer: Yes. Mitsubishi Heavy Industries designed and manufactured the 6-cylinder S6K engine, which Caterpillar adopted and rebranded as the CAT 3066 for their massively popular 320-series excavators. Our S6K replacement camshafts are a direct, OEM-spec drop-in for both Mitsubishi and CAT-branded heavy machinery.

What are your wholesale shipping terms for engine valvetrain parts?

We provide factory-direct wholesale pricing for engine rebuilders, 4×4 specialists, and heavy equipment parts distributors. Standard payment terms are T/T or L/C. To prevent corrosion and impact damage during transit, all camshafts are heavily coated in anti-rust oil, sealed in VCI protective tubing, and packed in reinforced export cartons. Global sea or air freight is available with a 15-30 day lead time.

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