Mitsubishi 4D56 Engine

The 4D56 is a notable diesel engine produced by Mitsubishi, which gained popularity in the 1980s and onwards. Here are the key details and various iterations of the engine:

Characteristics Of 4D56 Engine

Property 4D5/Astron Hyundai D4B
Production Kyoto Engine Plant Hyundai Ulsan Plant
Engine Make 4D5/Astron Hyundai D4B
Years of Manufacture 1986-present 1986-present
Cylinder Block Material Cast Iron Cast Iron
Engine Type Diesel Diesel
Configuration In-line In-line
Number of Cylinders 4 4
Valves per Cylinder 2 4
Piston Stroke, mm 95 95
Cylinder Diameter, mm 91.1 91.1
Compression Ratio 21.0 (4D5/Astron)
17.0 (Hyundai D4B)
16.5 (Hyundai D4B)
Engine Capacity, cc 2477 2477
Engine Power, hp/rpm 74/4200 (4D5/Astron)
84/4200 (Hyundai D4B)
90/4200 (Hyundai D4B)
104/4300 (Hyundai D4B)
114/4000 (Hyundai D4B)
136/4000 (Hyundai D4B)
178/4000 (Hyundai D4B)
178/4000 (Hyundai D4B)
Torque, Nm/rpm 142/2500 (4D5/Astron)
201/2000 (Hyundai D4B)
197/2000 (Hyundai D4B)
240/2000 (Hyundai D4B)
247/2000 (Hyundai D4B)
324/2000 (Hyundai D4B)
350/1800 (Hyundai D4B)
400/2000 (Hyundai D4B)
Environmental Standards Euro 2 Euro 3, Euro 4, Euro 5
Turbocharger IHI RHF4 (4D5/Astron) MHI TD04-09B (Hyundai D4B)
MHI TD04-11G (Hyundai D4B)
MHI TF035HL (Hyundai D4B)
Engine Weight, kg 204.8 (D4BF) 226.8 (D4BH)
Fuel Consumption (L200) City: 10.7 l/100 km, Highway: 7.5 l/100 km, Mixed: 8.7 l/100 km
Oil Consumption, g/1000 km Up to 1000
Engine Oil 5W-30, 10W-30, 10W-40, 15W-40
Oil Capacity, l 6.5
Recommended Oil Change, km 15,000 km (or better 7,500 km)
Engine Operating Temperature, degrees 90
Engine Life, thousand km According to the plant: — In practice: 350+
Tuning, hp Potential: — Without Loss of Resource: —
The Engine was Installed In Mitsubishi L200/Triton, Mitsubishi Pajero, Mitsubishi Pajero Sport/Challenger, Mitsubishi Delica, Mitsubishi Space Gear, Mitsubishi Strada, Hyundai Galloper, Hyundai Grace, Hyundai Porter, Hyundai Starex, Hyundai Terracan, Kia Bongo

Basic Specifications

  • Cylinder Block: The 4D56 engine featured a cast iron cylinder block with four cylinders arranged in an in-line configuration. Inside the block, it had a forged crankshaft with a piston stroke of 95 mm and was equipped with two balancer shafts for reduced vibrations. The connecting rods had a length of 158 mm, and the pistons had a compression height of 48.7 mm, resulting in a total working volume of 2.5 liters.
  • Cylinder Head: The cylinder head was made of aluminum and had vortex combustion chambers. It featured one camshaft and two valves per cylinder. The intake valves had a diameter of 40 mm, while the exhaust valves were 34 mm in diameter. The valve stem diameter was 8 mm.
  • Valve Adjustment: Valve adjustment was required approximately every 15,000 kilometers. When the engine was cold, the recommended valve clearances were 0.15 mm for both intake and exhaust valves.
  • Timing Drive: The camshaft was driven by a timing belt with a replacement interval of around 90,000 kilometers. Neglecting to replace the timing belt within this interval could lead to belt breakage and potential damage to the engine’s rockers.

Variants of the 4D56 Engine

  1. Early Naturally Aspirated Version: The initial versions of the 4D56 engine were naturally aspirated and produced around 74 hp at 4200 rpm, with torque of 142 Nm at 2500 rpm.
  2. Turbocharged Versions: Turbocharged versions followed, increasing power to 90 hp at 4200 rpm and torque to 197 Nm at 2000 rpm. An intercooler was added to further improve power, raising it to 104 hp at 4300 rpm and increasing torque to 240 Nm at 2000 rpm. In some cases, this engine was referred to as Hyundai D4BH.
  3. Common Rail Versions: The introduction of common rail fuel injection resulted in power enhancements. An engine model referred to as “DiD” delivered 114 hp at 4000 rpm and torque of 247 Nm at 2000 rpm. This version was Euro-3 compliant.
  4. DOHC Versions: From 2005, Mitsubishi introduced DOHC (Double Overhead Camshaft) versions with four valves per cylinder. These engines came with improved power output, such as 136 hp with 324 Nm of torque or 178 hp with 400 Nm (350 Nm for automatic transmission) of torque. The exhaust of these engines met Euro-4 and Euro-5 standards, depending on the manufacturing year.

4D56 Engine Problems and Disadvantages

  1. Extraneous Noise: Noise issues may be caused by a failing crankshaft pulley, which may require replacement.
  2. Oil Leaks: The engine is prone to oil leaks, often from various gaskets and seals including the valve cover gasket, balancer shaft seals, crankshaft seals, camshaft seal, and pan gasket.
  3. Engine Smoking: Unburnt fuel can cause engine smoking, often due to issues with injector nozzles.
  4. Cylinder Head Cracks: Cracks in the cylinder head are a common problem. Symptoms may include bubbling of antifreeze in the coolant tank.

It’s crucial to monitor and replace the balancer shaft belt every 40,000 to 50,000 kilometers to avoid potential issues.

Regular cleaning of the EGR (Exhaust Gas Recirculation) valve is advised to prevent carbon buildup.

Tuning the 4D56 Engine

Tuning an older engine like the 4D56 is not commonly recommended, but for those interested, chip tuning can be pursued to achieve power increases.

Expect power boosts of up to 70-80 Nm of torque, depending on the specific version of the engine. The maximum power achievable varies based on the engine variant, and different models can achieve anywhere from 140 hp to 210 hp after tuning.

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