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Complete Engine Assemblies for Excavators & Heavy Equipment

A complete engine assembly is the central power source in tracked machinery and plays a critical role in overall equipment performance. Engine assemblies generate and regulate power flow, driving hydraulic pumps, track drive systems, and final drives that move excavators, bulldozers, and other heavy equipment efficiently.

In demanding environments, a new engine assembly ensures stable power delivery to undercarriage drive components such as excavator drive sprockets, track links, and track chains. When engines are running smoothly, machines experience reduced wear and tear, improved control, and longer component life.

Poor engine output or unstable torque can lead to power loss, uneven movement, and excessive strain on undercarriage systems. This type of poor engine performance often accelerates sprocket damage and shortens the lifespan of connected components.

IMARA Engineering Supplies provides high-performance engine assemblies engineered for long-term reliability. Whether replacing a failed unit or upgrading a fleet, our engines deliver consistent torque, controlled fuel consumption, and dependable operation that protects your machinery and keeps productivity high.

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53 products

Caterpillar C27 Rebuild Engine Assembly 440-0240

Rebuild Engine Assembly 440-0240 4400240 for Caterpillar C27

Regular price $168,918.00
Sale price $168,918.00 Regular price $156,325.00
C15 Engine Assy 487-6161 for CAT 374D 374F

C15 Engine Assy 487-6161 4876161 for CAT 374D, 374F Excavators

Regular price $101,970.00
Sale price $101,970.00 Regular price $1,533.00
Engine Assembly 8188177 VOE8188177 for Volvo EC360BLC Engine

Engine Assembly 8188177 VOE8188177 for Volvo EC360BLC Engine

Regular price $0.00
Sale price $0.00 Regular price
Engine Ass'y 4M50 for Mitsubishi KATO HD820-5 SY215-10

Mitsubishi Engine Ass'y 4M50 for KATO HD820-5 & Sany SY215-10 Excavators

Regular price $8,127.00
Sale price $8,127.00 Regular price $7,305.00
Engine Assembly 6I0793 for Cat 3116 Engine – CAT 953B Loader

Isuzu Engine Ass'y 6BG1-TABFD-08-C2 for Excavators

Regular price $7,762.00
Sale price $7,762.00 Regular price $5,022.00
Engine Assembly 6I0793 for Cat 3116 Engine – CAT 953B Loader

Isuzu Engine Ass'y 6BG1 for Hitachi EX200-5, EX225-5, ZAX230-6 & ZAX210W Excavators

Regular price $7,205.00
Sale price $7,205.00 Regular price $5,022.00
Hydraulic/Transmission Cooler Type 2 56021486 LH621 Loader

Engine Ass'y S4S 32A32-05100 for Mitsubishi Excavators (Straight-Through Configuration)

Regular price $10,775.00
Sale price $10,775.00 Regular price $1,096.00
Engine Assembly 6I0793 for Cat 3116 Engine – CAT 953B Loader

Engine Ass'y 4JG1 for Isuzu-Powered Doosan DH55 & Hitachi ZAX70 Excavators

Regular price $3,288.00
Sale price $3,288.00 Regular price $1,644.00
Water Pump GP 235-4536 for Caterpillar C13 C15 C18 Engines

Engine Ass'y 3TNV88-GGHWC for Yanmar 3D88 & 3D88E Excavators

Regular price $5,477.00
Sale price $5,477.00 Regular price $2,739.00
Engine Ass'y 4M50 for Mitsubishi KATO HD820-5 SY215-10

Engine Ass'y 6CTA8.3 for Cummins-Powered Excavators

Regular price $15,338.00
Sale price $15,338.00 Regular price $7,669.00
Water Pump GP 235-4536 for Caterpillar C13 C15 C18 Engines

Engine Ass'y QSK23 for Komatsu PC1250 & EX1200-6 Excavators

Regular price $2,009.00
Sale price $2,009.00 Regular price $1,005.00
Water Pump GP 235-4536 for Caterpillar C13 C15 C18 Engines

Engine Ass'y 6BT5.9-6D102 for Cummins Excavators

Regular price $6,008.00
Sale price $6,008.00 Regular price $3,004.00
Hydraulic/Transmission Cooler Type 2 56021486 LH621 Loader

Engine Ass'y QSM11-C375 for Cummins Excavator Applications

Regular price $23,740.00
Sale price $23,740.00 Regular price
Hydraulic/Transmission Cooler Type 2 56021486 LH621 Loader

Engine Ass'y 4BT-C130 for Cummins 4-Cylinder Applications

Regular price $10,957.00
Sale price $10,957.00 Regular price
Engine Ass'y C13 for CAT 336 Excavator & 740 Dump Truck

Engine Ass'y QSK50-C2000 for Liebherr R9400 Excavator

Regular price $456,533.00
Sale price $456,533.00 Regular price $228,267.00
Engine Ass'y 4BT3.9 for Cummins Excavator Applications

Engine Ass'y QSX15 510HP for CE750-8 Excavator

Regular price $17,531.00
Sale price $17,531.00 Regular price $8,766.00
Engine Assembly 6I0793 for Cat 3116 Engine – CAT 953B Loader

Engine Ass'y 4BT3.9 Turbo for Cummins Excavators

Regular price $6,209.00
Sale price $6,209.00 Regular price $3,105.00
Engine Assembly 6I0793 for Cat 3116 Engine – CAT 953B Loader

Engine Ass'y 6BT5.9 for Cummins Equipment

Regular price $6,027.00
Sale price $6,027.00 Regular price $3,014.00
Hydraulic/Transmission Cooler Type 2 56021486 LH621 Loader

CAT C2.2 Engine Ass'y 233-6648 for CAT 216B, 226B Skid Steer Loaders

Regular price $0.00
Sale price $0.00 Regular price

Collection: Engine Assembly

Complete Engine Assemblies vs. Component Rebuilds

When an engine fails, operators must decide whether to repair individual components or install a full engine assembly. While rebuilds may address isolated issues, complete engine assemblies offer clear operational advantages.

Minimized Downtime:

A drop-in engine assembly can be installed quickly. This reduces downtime compared to long rebuilds. Rebuilds often involve internal parts like pistons, crankshafts, or a worn timing belt.

Factory-Tested Performance:

Each engine assembly is balanced and tested to ensure efficient power transmission and smooth interaction with hydraulic pumps and track drive systems.

Extended Service Life:

Modern engines are designed to handle heat, vibration, and continuous workloads. Improved internal tolerances help protect exhaust systems, cooling components, and undercarriage parts from early failure.

Engineered for Mining and Construction Applications

Our engine assemblies are designed for heavy-duty construction, mining, and industrial use. From machines requiring heavy-duty drive sprockets for mining excavators to those operating under constant load cycles, our engines deliver dependable output.

Each assembly supports efficient power flow, converting fuel energy into controlled motion while maintaining excellent fuel economy. Proper alignment between the engine and drivetrain ensures smoother movement, reduced shock loading, and consistent traction across steel or rubber tracks.

Unlike a car engine, heavy equipment engines must sustain continuous output without interruption, even when operating alongside auxiliary systems that rely on electric power and higher operational demands.

Engine Maintenance for Long-Term Reliability

Even the best engine assembly requires proper engine maintenance to perform optimally. A lack of routine care can result in reduced efficiency, overheating, or premature failure.

Regular Checks and Filters:

Regular checks of air filters and fuel filters help keep the fuel system clean and protect internal components from contamination that leads to wear and tear.

Monitor Warning Indicators:

Ignoring a check engine light or warning codes related to sensors such as the oxygen sensor can lead to undetected performance issues and increased fuel consumption.

Cooling and Exhaust Systems:

Maintaining the cooling system prevents overheating that can damage seals and internal components. Well-maintained exhaust systems also help engines operate efficiently under load.

Proper maintenance ensures engines continue running smoothly, deliver stable power, and avoid sudden power loss that can disrupt operations.

Order Engine Assemblies with Confidence

When you choose IMARA Engineering Supplies, you partner with a supplier focused on performance, reliability, and technical accuracy. Each engine assembly undergoes rigorous testing to ensure proper power delivery, controlled emissions, and durability under demanding conditions.

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