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PowerTech 12.5L Diesel Engines

PowerTech 12.5L Diesel Engines. Level 6 Electronic Fuel System. 12.5L Engine Applications. Tractors – 9220, 9320, 9420, 9520 Combines – 9860 & 9880 STS Forage Harvesters – 7300, 7400, 7500. John Deere Focus Controllers. Level 1 – Lucas DP201 Pump 4.5 & 6.8L

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PowerTech 12.5L Diesel Engines

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  1. PowerTech 12.5L Diesel Engines Level 6 Electronic Fuel System

  2. 12.5L Engine Applications Tractors – 9220, 9320, 9420, 9520 Combines – 9860 & 9880 STS Forage Harvesters – 7300, 7400, 7500

  3. John Deere Focus Controllers Level 1 – Lucas DP201 Pump 4.5 & 6.8L Level 3 – Bosch In-Line Pump 6.8 & 8.1L Level 4 – Bosch VP44 Rotary 4.5 & 6.8L Level 6 – Lucas (current) EUIs 10.5 & 12.5L Level 8 – Natural Gas HFN04 8.1L Level 9 – Denso HPCR 8.1 Level 11 – Denso HPCR 4.5 & 6.8L Level 12 – Stanadyne DE10 4.5 & 6.8 Lucas – Lucas (early) EUIs 10.5 & 12.5L

  4. EUI Cycles

  5. EUI Vent Cycle

  6. EUI Pumping Cycle

  7. EUI Injection Cycle

  8. Turbocharger

  9. Pilot injection is an Engine Control Unit (ECU) software cold starting aid. It provides faster starting with less smoke and faster clean-up time than engines on normal injection. The cold engine also runs much smoother without the diesel knock noise and vibration associated with cold diesel engines running on normal injection. • Pilot injection (top pulse curve) provides two injection pulses for each cylinder on the compression stroke. The first pulse or pilot injection pulse will occur approximately 18° before top dead center. This pulse will energize the injector to deliver .0007 oz (20 mg) of fuel. This fuel will ignite and cause the cylinder pressure and temperature to rise as the piston rises in the cylinder. (See pilot injection cylinder pressure curve above). • A second pulse will occur approximately 2° before top dead center. Since the cylinder is already warm, the fuel ignites. The engine starts quickly, runs smooth, and smoke cleans up quickly. Pilot injection will automatically shut off when coolant temperature reaches approximately 27 °C (80 °F). At that point a slight difference in engine sound can be heard. • An engine running on normal injection receives only one pulse. (See normal injection pulse curve above). This pulse provides a large quantity of cold fuel to be injected which will quench the combustion. (See non-pilot injection cylinder pressure curve above). Since the fire goes out, the engine has a long cranking time to start, runs rough when it does start, and takes longer for smoke to clean up.

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