Genuine 517-8243 Fuel Injector Sleeve for CAT C4.4, C6.6, and C7.1 Engines
Coolant in your engine oil? White smoke from the exhaust? A failing injector sleeve is often the culprit. The 517-8243 FUEL INJECTOR SLEEVE for CAT C4.4 C6.6 C7.1 ENGINE is the genuine OEM solution designed to restore the critical seal between the fuel injector and the cylinder head. This precision-engineered component, also referenced as part number 5178243, prevents combustion gases from escaping and stops coolant from leaking into the cylinders, ensuring your Caterpillar® engine operates at peak efficiency and reliability .
Direct Fit for CAT Engine Families
This CAT injector sleeve is engineered as a direct replacement for the cylinder head bore where the fuel injector is mounted. Its compatibility spans multiple engine platforms and the equipment they power:
For CAT C4.4 Engine Applications:
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Compact Wheel Loaders: 906M, 907M, 908M
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Backhoe Loaders: 415F, 416F, 420F, 430F
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Mini to Small Excavators: 305.5E, 306E, 307E, 308E
For CAT C6.6 Engine Applications:
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Mid-Size Excavators: 313D, 314D, 315D, 318D
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Wheel Loaders: 924H, 924K, 928H, 930K
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Industrial Power Units and Generator Sets
For CAT C7.1 Engine Applications:
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Excavators: 320D, 320D2, 323D, 326D, 330D
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Wheel Loaders: 938M, 950M, 962M
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Motor Graders: 140M, 140M2, 160M, 160M2
Critical Note: This fuel injector sleeve fits the cylinder head bore. Always verify your engine’s exact model and Engine Serial Number (ESN) to ensure the correct 517-8243 injector sleeve for your specific application.
Why Choose This Genuine CAT Injector Sleeve?
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OEM Precision for Perfect Sealing: This genuine CAT injector sleeve is manufactured to exact factory specifications for diameter, depth, and surface finish. It ensures the injector seats properly and creates a gas-tight and coolant-tight seal within the cylinder head.
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Prevents Coolant Contamination & Engine Damage: A leaking injector sleeve allows coolant to enter the combustion chamber or crankcase, leading to white smoke, milky oil, and potential bearing failure. Replacing worn sleeves with OEM components protects your engine from catastrophic damage.
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Restores Compression & Engine Performance: A compromised sleeve seal allows combustion gases to escape, reducing power and efficiency. Installing a new sleeve restores proper cylinder pressure and engine performance.
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Essential for Injector Replacement: Whenever fuel injectors are removed from C4.4, C6.6, or C7.1 engines, the injector sleeves should be inspected and replaced if any signs of wear or damage are present. This preventative step ensures long-term reliability.
Technical Specifications & Details
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Genuine Part Numbers: 517-8243 / 5178243 .
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Component Type: Fuel Injector Sleeve (Cylinder Head Component).
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Function: Provides a precision-machined seating surface for the fuel injector and seals the injector bore from combustion pressure and engine coolant.
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Application: A critical engine cylinder head part for CAT C4.4, C6.6, and C7.1 diesel engines .
Symptoms of Failing Injector Sleeves
Replace your injector sleeves with 517-8243 if you observe any of these warning signs:
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White Exhaust Smoke: Indicates coolant entering the combustion chamber through a failed sleeve seal.
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Milky Engine Oil: Coolant mixing with oil, visible on the dipstick or under the oil fill cap.
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Loss of Coolant: Unexplained coolant loss without external leaks.
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Rough Running or Misfire: Combustion gases leaking past the injector sleeve.
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Overheating: Air or exhaust gases entering the cooling system.
Order Your CAT Injector Sleeves Today
Protect your engine investment with genuine OEM components. Our 517-8243 fuel injector sleeves for CAT C4.4, C6.6, and C7.1 engines are in stock and ready for immediate shipment. These sleeves are typically sold individually; a complete engine set requires the correct quantity based on cylinder count .
Click to order the CAT 517-8243 FUEL INJECTOR SLEEVE. Contact our technical support team with your Engine Serial Number for guaranteed compatibility.
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