Mitsubishi 4D56 4D56T High-Grade Aluminium Alloy Cylinder Head Assembly with SOHC 8-Valve Configuration and Recessed Valves
Basic Properties
Place of Origin:
CHINA
Brand Name:
YIMI
Certification:
ISO/TS16949
Model Number:
4D56 4D56T
Trading Properties
Minimum Order Quantity:
20 PCS
Price:
Negotiable
Payment Terms:
T/T
Supply Ability:
10000 pcs/month
Specifications
| Engine Displacement: | 2,477 Cc | Compression Ratio: | 21.0:1 |
| Head Bolt Torque: | 29 N·m + 59 N·m + 90° | Valve Configuration: | SOHC, 8 Valves |
| Valve Clearance: | Intake 0.15 Mm / Exhaust 0.25 Mm | Bore × Stroke: | 91.1 Mm × 95.0 Mm |
| High Light: | High-Grade Aluminium Alloy Cylinder Head Assembly,SOHC 8-Valve Configuration Cylinder Head,Recessed Valves Engine Cylinder Head |
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Product Description
Mitsubishi 4D56 4D56T Cylinder Head Assembly 908513 OEM Fit
Cylinder Head Assembly 908513 MD348983 for Mitsubishi 4D56 4D56T 2.5L Diesel — Verified OEM Fit Complete SOHC 8V Aluminium Cylinder Head with Recessed Valves
Product Overview
The Cylinder Head Assembly with reference number 908513 and OEM numbers MD348983 / MD303750 / MD351277 is a verified direct-fit replacement for Mitsubishi L200 / Pajero / Montero / Delica / L300 / L400 / Triton / Challenger / Shogun Sport vehicles equipped with 4D56 / 4D56T 2.5L diesel engines, as well as Hyundai Galloper / Terracan / H-1 / Starex and Kia Pregio equipped with D4BA / D4BH engines. This cylinder head is a critical engine component that forms the combustion chamber, houses the valvetrain, and manages intake and exhaust gas flow.
Working Principle
The cylinder head sits atop the engine block and forms the upper half of the combustion chamber. It houses the camshaft (SOHC), valve springs, intake and exhaust valves, and precombustion chambers. The camshaft actuates the valves to control air intake and exhaust gas expulsion at precisely timed intervals. The cylinder head must withstand combustion pressures exceeding 160 bar while managing thermal expansion and maintaining a gas-tight seal with the cylinder block via the head gasket.
The 4D56 is a 2,477 cc inline-four SOHC diesel engine producing approximately 85 PS (63 kW) at 4,200 rpm and 196.1 N·m of torque at 2,000 rpm, widely used in Mitsubishi L200, Pajero, and Delica from 1983 to 2011. A notorious failure mode for the 4D56 engine is thermal fatigue cracking between the valve seats and glow plug holes, frequently occurring under heavy payloads and high operating temperatures. This replacement cylinder head directly addresses this inherent vulnerability by utilizing an upgraded high-grade aluminium alloy casting with improved thermal conductivity to mitigate the risk of cracking. The AMC 908 513 casting features recessed valves and is manufactured using low-pressure die casting to ensure uniform density and prevent porosity in critical areas.
Failure Symptoms
Replace the cylinder head assembly when any of these symptoms appear:
- Coolant loss without visible external leaks — a cracked cylinder head or failed head gasket allows coolant to enter the combustion chamber or oil galleries.
- White smoke from the exhaust after warm-up — coolant entering the combustion chamber produces white steam from the exhaust.
- Milky or emulsified engine oil — coolant mixing with oil creates a milky emulsion on the dipstick or oil filler cap, indicating head deck warpage or cracking.
- Overheating at low speeds or under load — reduced cooling efficiency from head cracks or gasket failure causes persistent overheating.
- Rough idle, misfiring, or loss of power — compression loss between cylinders causes misfiring and poor engine performance.
- Pressurized coolant hoses — combustion gases entering the cooling system pressurize the hoses, causing swelling or coolant expulsion.
- No hot air from the heater — a common symptom of combustion gases entering the cooling system and displacing coolant.
⚠️ Critical Inspection Note: Mitsubishi service manuals require that when replacing the cylinder head, new cylinder head bolts must always be used — never reuse old head bolts. The cylinder head bolt tightening procedure requires a staged torque-and-angle method: Step 1: 29 N·m (21 ft-lb). Step 2: 59 N·m (44 ft-lb). Step 3: turn an additional 90°. Always replace the cylinder head gasket with a new unit. Valve clearance (cold): Intake 0.15 mm / Exhaust 0.25 mm.
Technical Specifications
| Verification Item | Data / Standard | Source / Method |
|---|---|---|
| Reference Number | 908513 | AMC reference |
| OEM Part Numbers | MD348983 / MD303750 / MD351277 / MD313587 | Mitsubishi OEM Parts Database |
| Engine Compatibility | 4D56 / 4D56T (2.5L, 4-cylinder, SOHC) / D4BA / D4BH | Mitsubishi / Hyundai application catalog |
| Engine Displacement | 2,477 cc | Prestige Motorsport specification |
| Valve Configuration | SOHC, 8 Valves | Product specification |
| Material | High-Grade Aluminium Alloy | Ruich Auto Parts specification |
| Compression Ratio | 21.0:1 | Prestige Motorsport specification |
| Head Bolt Torque | 29 N·m + 59 N·m + 90° | LinkedIn specification |
| Valve Clearance (Cold) | Intake 0.15 mm / Exhaust 0.25 mm | Mitsubishi workshop manual |
| Certification | ISO/TS 16949 | Third-party system audit |
OEM Cross-Reference
| Type | Number |
|---|---|
| Reference Number | 908513 |
| Primary OEM | MD348983 / MD303750 / MD351277 / MD313587 |
| Related OEM | MD185922 / MD185926 / MR984455 / 2200042A20 / 22100-42700 |
| Hyundai OEM | 22100-42000 / 22001-42A20 / 22100-42900 |
Platform Note: The 908513 cylinder head is used across the Mitsubishi 4D56 and Hyundai D4BH engine families. The MD303750 is the earlier production version, while MD348983 is the updated casting with recessed valves. The AMC 908513 is the primary aftermarket reference number. The cylinder head is available in bare configuration (without camshaft or valves, with guides and precombustion chambers) and complete configuration (with valves, springs, and camshaft). Confirm your exact engine model and required configuration before ordering.
Product Details
| Part Number: | 908513 | Product Name: | Cylinder Head Assembly |
| Car Model: | 4D56 4D56T | Engine Model: | 4D56 4D56T |
| Condition: | 100% Brand New | Origin: | China Mainland |
Vehicle & Engine Compatibility
Primary Applications
| Brand | Model | Engine | Years |
|---|---|---|---|
| Mitsubishi | L200 / Triton | 4D56 / 4D56T | 1983–2011 |
| Mitsubishi | Pajero / Montero | 4D56 / 4D56T | 1982–2001 |
| Mitsubishi | Pajero Sport / Challenger | 4D56 / 4D56T | 1996–2010 |
| Mitsubishi | Delica / L300 / L400 | 4D56 / 4D56T | 1980–2007 |
Non-Mitsubishi Applications (Same Engine Platform):
| Brand | Model | Application |
|---|---|---|
| Hyundai | Galloper / Galloper II | SUV (D4BH engine) |
| Hyundai | Terracan 2.5 TD | SUV (D4BH engine) |
| Hyundai | H-1 / Starex | Van (D4BH engine) |
| Kia | Pregio | Van (D4BH engine) |
⚠️ Important Fitment Notes:
- This cylinder head is designed for the 4D56 / 4D56T / D4BA / D4BH engine family. Confirm your specific engine model and year before ordering.
- This is the cylinder head assembly, not the cylinder head gasket. The head gasket is a separate component.
- This is the updated casting design with recessed valves (AMC 908 513). The earlier casting without recessed valves is AMC 908 512.
- Configuration options: The bare head includes guides and precombustion chambers but no camshaft or valves. The complete head includes camshaft, valves, and springs.
- Always use new cylinder head bolts — never reuse old head bolts.
Features & Benefits
Upgraded Aluminium Alloy Casting
Improved thermal conductivity directly mitigates the risk of cracking between valve seats and glow plug holes.
Improved thermal conductivity directly mitigates the risk of cracking between valve seats and glow plug holes.
Recessed Valve Design
Matches the updated OEM casting for later model 4D56T and Hyundai D4BH engines.
Matches the updated OEM casting for later model 4D56T and Hyundai D4BH engines.
Low-Pressure Die Casting
Ensures uniform density and prevents porosity in critical areas.
Ensures uniform density and prevents porosity in critical areas.
Precision-Machined Combustion Chambers
Ensures proper compression ratio (21.0:1) and combustion efficiency.
Ensures proper compression ratio (21.0:1) and combustion efficiency.
ISO/TS 16949 Quality System
Full traceability with material certificates and batch inspection reports.
Full traceability with material certificates and batch inspection reports.
Quality Control & Verification
| QC Item | Verification Method / Standard |
|---|---|
| Combustion Chamber Volume | CMM + burette test, 100% inspection |
| Deck Surface Flatness | Surface plate + feeler gauge, 100% inspection |
| Valve Seat Angles | Optical comparator, 100% inspection |
| Crack Detection | Magnetic particle inspection (MT) or dye penetrant (PT), 100% inspection |
| Coolant Passage Integrity | Pressure test, 100% inspection |
Installation & Maintenance
⚠️ IMPORTANT: Cylinder head installation is an engine overhaul-level operation. It must be performed by a qualified diesel engine technician in a clean workshop. Always use new cylinder head bolts. Never reuse old head bolts — they are torque-to-yield fasteners and will not maintain proper clamping force if reused.
Recommended Torque Values:
| Fastener | Torque |
|---|---|
| Cylinder Head Bolts (Step 1) | 29 N·m (21 ft-lb) |
| Cylinder Head Bolts (Step 2) | 59 N·m (44 ft-lb) |
| Cylinder Head Bolts (Step 3) | Additional 90° turn |
| Valve Clearance (Cold) | Intake 0.15 mm / Exhaust 0.25 mm |
Maintenance Schedule:
- Every 10,000 km: Change engine oil and filter. Check coolant level and condition.
- Every 30,000–40,000 km: Check valve clearance. Adjust if necessary.
- Every 100,000 km: Perform compression test to monitor head gasket integrity.
- When overheating occurs: Inspect cylinder head immediately for warpage or cracking.
Packaging & Supply
- Standard Packaging: Anti-rust oil + VCI film + neutral carton + wooden case
- Custom Packaging: Neutral box, color box, or customer-branded packaging
- Suitable For: Engine overhaul workshops, Mitsubishi/Hyundai parts distributors, fleet maintenance centers
- Minimum Order Quantity: 2 PCS
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