Heavy-Duty Crankshafts for Excavators & Machinery
The crankshaft is the structural backbone of the internal combustion engine. Its primary role is to convert the linear motion of the connecting rods into the rotational mechanical energy required to drive your equipment. We are known to provide high-quality crankshafts engineered to withstand the extreme torque and high-pressure loads characteristic of a heavy-duty diesel engine.
Our machinery engine parts are precision-machined to ensure perfect balance. By choosing premium-grade engine parts, you safeguard your machine against vibration-related fatigue, ensuring engine performance remains consistent even in the most grueling Australian operating conditions.
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Crankshaft 236-1005009-D2 for YaMZ-236 – MTZ Tractor Engine Component
Engine Crankshaft 364-2829 330-1736 for CAT C4.4 – Excavator
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Crankshafts
Engineering for Maximum Engine Protection
In a heavy-duty diesel engine, the crankshaft operates under relentless stress. Any minor flaw in the forging can lead to catastrophic engine failure, such as snapped journals or cracked connecting rods. Utilizing quality engine parts from IMARA provides the protection necessary to prevent such engine damage during peak workloads.
A precision-balanced crankshaft also helps maintain the integrity of the combustion chambers. By ensuring the pistons reach the exact height required at the cylinder head, the crankshaft facilitates an optimal air-fuel mix. This precision enhances fuel economy and ensures the engine is fuel efficient, preventing the leakage of combustion gases that can lead to power drops.
Our Range of Precision-Forged Crankshafts
We supply crankshafts for major equipment brands, tailored to your specific engine model. Every unit is rigorously tested to ensure it meets or exceeds OEM tolerances for long-term reliability.
1. Forged Steel Crankshafts
Our forged steel crankshafts offer maximum strength and fatigue resistance. These are essential for high-performing internal combustion systems that operate under constant high-load cycles. The forging process ensures a superior grain structure, providing the durability needed to handle high-pressure combustion without the risk of fracture.
2. Precision-Ground Journals to Reduce Friction
The longevity of a crankshaft depends entirely on its lubrication. Our units feature precision-ground journals and polished oil ways to ensure that engine oil reaches the bearings without restriction. This design helps reduce friction and allows for a stable oil change interval, keeping your maintenance costs predictable.
3. Harmonic Balancing and Vibration Control
Excessive vibration is a leading cause of engine failure. Our crankshafts are balanced to eliminate the harmonics that can damage the cylinder head and mounting brackets. This balance ensures that engines running at high RPMs stay smooth, protecting the entire rotating assembly.
Optimizing Engine Performance and Lube Integrity
A perfectly balanced crankshaft is the key to achieving the highest fuel economy and power output. When the rotating assembly moves with minimal resistance, the engine consumes less fuel to generate the same amount of power.
- Oil Viscosity Management: Proper journal clearances ensure that motor oils of varying oil viscosity can maintain a protective film, whether you use conventional oil or high-quality engine oil.
- Clean Lubrication: Smooth oil passages ensure that your oil pump can maintain the correct pressure, while a high-grade oil filter keeps the journals free from scoring.
- Preventing Oil Issues: By maintaining perfect alignment, our crankshafts prevent the uneven wear on oil control rings that causes an engine to start burning oil or suffer from excessive oil consumption.
Technical Support and OEM Fitment
Because the crankshaft is the core of the engine, precision is non-negotiable. Variations in stroke length or gear configuration can vary significantly between different engine models. We use your engine serial number to provide an exact match for your machine.
Our technical experts understand how the crankshaft interacts with pistons and liners to create a balanced, efficient power plant. By providing high-quality parts that fit perfectly the first time, we help you avoid "Machine Off Road" (MOR) delays and ensure your engine oil consumption remains within factory specs.
Rapid Logistics for Major Engine Overhauls
We understand that a crankshaft failure is a major event that halts production. We have optimized our supply chain for the rapid dispatch of heavy machinery engine parts across Australia. Whether you are performing a planned mid-life overhaul or an emergency repair, we deliver the quality engine parts you need to restore your engine's power fast.
Frequently Asked Questions
If a crankshaft is worn or unbalanced, it creates internal friction. This means the internal combustion engine has to burn a larger amount of fuel just to keep the piston moving consistently. This extra effort results in increased fuel costs and directly lowers your overall fuel efficiency.
Unlike gasoline engines found in a typical car engine, a diesel engine relies on a high compression ratio to work. The air inside the cylinder engine becomes highly pressurized and hot enough to ignite the diesel fuel automatically. Because of the intense pressure needed to push the piston, internal engine components like the crankshaft must be much heavier and stronger than those in light vehicles.
The crankshaft is mechanically linked to the timing of the intake valve and exhaust valve. If they aren't opened and closed in perfect sync, the intake manifold can't deliver enough air, and spent exhaust gases can't escape. This "chokes" the engine, leading to a massive loss in engine power and a drop in fuel economy.
Yes. While most of our customers use standard diesel fuel, our crankshafts are built to the high standards required for various alternative fuels and biofuels. As long as your fuel delivery system and fuel injectors are tuned correctly for the switch, these internal engine components will handle the change without a problem.

