3974254 Fuel Injectors Set of 4, Replacement for Bobcat 743 643 645 225 231 with Kubota Engine D1402 V1100 V1902 D950, 4Pcs Diesel Injector 15271-53020 15221-53140

Product SpecificationsPart Numbers: 3974254, 15271-53020, 15221-53140, 15221-53200, 15221-53030, 15271-53010, 15271-53030, 15443-53020, 15221-53020, 15221-53000, 15271-53002, 19202-53021, 19202-53020, 70000-65400, 70000-65209Quantity: Set of 4 injectors (complete replacement for 3-4 cylinder for Kubota engines)Fuel Type: Diesel (ULSD, B20 compatible with monitoring)Injector Type: Mechanical pencil nozzle (indirect or direct injection depending for Kubota model)Opening Pressure: Factory specification typically 1800-2200 PSI (120-150 Bar) - calibration requiredNozzle Type: Multi-hole (2, 4, or 5 hole depending for Kubota engine)Holder Type: Flange mount with 2-bolt hold-down or threaded body - verify on your BobcatSealing Washer: Copper crush washer (replace each time)Compatible with Bobcat Models (with Kubota Engine)For Bobcat 220, 225, 231 excavatorsFor Bobcat 313, 325, 331 excavatorsFor Bobcat 443, 453, 543, 553 skid steer loadersFor Bobcat 643, 645, 743, 1600 skid steer loadersCompatible with Kubota EnginesFor Kubota D750, D850, D950, D1302, D1402For Kubota V1100, V1512, V1702, V1902Diesel Injector Function on for Kubota EnginesMechanical Operation: No electrical connection - injector opens at preset pressure (spring loaded)Injection Pump Supply: Diesel injection pump delivers high-pressure fuel to each 3974254 injector via hard linesAtomization: Injector tip sprays finely misted diesel for complete combustion in your Bobcat enginePressure Calibration: Each injector must be pop-tested and shimmed to correct opening pressure on a benchFailure Impact: Stuck-open injector causes cylinder knock and white smoke for Kubota. Clogged injector causes misfire and power loss.

• 📋 Part Number Verification - This set of 4 fuel injectors replaces for Kubota numbers 3974254, 15271-53020, 15221-53140, 15221-53200, 15271-53010, and 15221-53020. Also fits 15221-53000, 15271-53002, 19202-53021, 19202-53020, 70000-65400, and 70000-65209. Before ordering these 3974254 injectors for Bobcat, verify your original part matches one of these numbers.
• 🚜 For Bobcat Skid Steer Compatibility - These 3974254 fuel injectors fit for Bobcat 643, 645, 743 skid steer loaders with Kubota diesel engines. Also compatible with Bobcat 220, 225, 231, 325, 331, 313, 443, 453, 543, 553, and 1600 series. The 4-piece injector set replaces worn nozzles for Bobcat's for Kubota engine.
• 🌾 For Kubota Engine & Tractor Fitment - This 3974254 injector set fits for Kubota engines D1402, V1100, V1902, D750, D850, D950, D1302, V1702, and V1512. Compatible with Kubota L-series tractors: L245DT, L275, L285, L295DT, L305DT, L345, L355S, L2050DT, L2350DT. Also fits M-series M4000, M4050, M4500 and B-series B5200, B6100, B7100, B8200. Verify your engine model before ordering.
• 💨 Diesel Engine Failure Symptoms - For Bobcat 743 has white smoke at cold start, individual 3974254 injectors may have worn tips. Hard starting when hot on your 643 skid steer points to leaking injectors. Black smoke under load indicates poor atomization from worn nozzles. Rough idle at operating temperature means one or more injectors delivering uneven fuel for Kubota V1902 engine. Replace all 4 injectors at once on this diesel engine.
• 🔧 Pre-Installation Requirements - Before installing these 3974254 fuel injectors for Bobcat, clean all fuel lines and replace the diesel fuel filter. Contaminated fuel is the #1 cause of injector failure for Kubota engines. Each injector requires new copper sealing washers and O-rings (not always included - verify). Professional diesel technician installation required - injectors must be pop-tested and calibrated before installation for Bobcat 645.