Welcome to Malaga We Bex CATERPILLAR Common Rail
Welcome to Malaga We. Bex CATERPILLAR Common Rail Fuel System
CATERPILLAR Common Rail Fuel System
CATERPILLAR Common Rail Fuel System
Orifice CATERPILLAR Common Rail Fuel System
Electronic Control Module (ECM) • ECM Controls: – Fuel Pressure – Speed Governing – Air/Fuel Ratio – Start/Stop Sequence – Engine Protection Devices/ Diagnostics CATERPILLAR Common Rail Fuel System
Fuel Pump Function • • Pump Raises Pressure ECM tells Injector to Fire Rail Pressure Drops ECM Detects Pressure Drop – Sensed by Fuel Rail Pressure Sensor • ECM tells Pump Solenoid to Increase Volume – Also tells Pump Solenoid to Spill fuel once pressure is reached • Do it Again! CATERPILLAR Common Rail Fuel System
Fuel Leak off to Tank Oil lubrication Fuel in from Secondary Filter To Fuel HP Manifold Pump Speed To Secondary Filter Position Sensor Locks the Pump CATERPILLAR Common Rail Fuel System From Primary Filter
Transfer Pump Driven by High Pressure Pump Draws Fuel through Primary Filter Output Pressure 300 to 600 k. Pa Transfer Pump Primed by Priming Pump Hand or Electric CATERPILLAR Common Rail Fuel System
High Pressure Fuel System Do’s & Don’ts Fuel Manifold Do Check for leaks Do Not Loosen HP Connection with Engine Running Do Replace HP Pipes After they are Loosened Do Replace ALL Hp Pipes if new manifold is Installed Do Not Force Pipes to Fit Do Cap Manifold and Injector Connections Immediately when HP Pipe is removed CATERPILLAR Common Rail Fuel System Injector Lines High PRV Rail Pressure Sensor
Fuel Pressure Relief Valve Protects System from Over. Pressure Opens at Constant Pressure of 160 MPa (23, 000 PSI) Withstands Spikes to 190 Mpa (27, 500 PSI) Returns fuel to Tank CATERPILLAR Common Rail Fuel System High Pressure Relief Valve
Fuel Return from Head Excess Fuel Returned to Transfer Pump Not High Pressure CATERPILLAR Common Rail Fuel System Fuel Return from Head LIne
Injector Function Injector De-energizes Valve Closes Unused fuel flows back to Transfer Pump via passage in the Head CATERPILLAR Common Rail Fuel System
Fuel Injector Do’s and Don’ts Do Write down the Injector Serial Number and Confirmation Code before you install the Injector Do use Cat ET to Program ECM with proper Injector Trim File Do Look for the Trim File CD in the Injector Box CATERPILLAR Common Rail Fuel System
Injector Adaptive TRIM Fuel System Optimization Routine Runs every hundred hours or so Audible changes when engine is running NO performance or Power Changes Everything’s OK Similar to HD ACERT engines CATERPILLAR Common Rail Fuel System
CATERPILLAR Common Rail Fuel System
Cat Common Rail Fuel System C 175 Advantages High Pressure Rail Meets emissions Lower fuel consumption Better transient response High Pressure Pump Primary Fuel Filter/ Water Separator Cooler Secondary Fuel Filters Electric Priming Pump CATERPILLAR Common Rail Fuel System Fuel Tank
Cat Common Rail Fuel System v. Low Pressure Fuel System Ø FTP Ø Electric Priming Ø Filtration CATERPILLAR Common Rail Fuel System
Cat Common Rail Fuel System v. Fuel System Ø HP Pump Ø Double Wall Lines Ø Double Wall Rails Ø Flow Limiter Ø Injector CATERPILLAR Common Rail Fuel System
Cat Common Rail Fuel System - HP Rail Low Pressure Injector return Double Wall Crossover Line CATERPILLAR Common Rail Fuel System Pressure Sensor Double Wall Lines From HP Pump To Rail
High Pressure Fuel System Hardware PRV Outlet HP Outlet Oil Supply Camshaft FTV Drive Oil Return CATERPILLAR Common Rail Fuel System Flow Control Valve
Flow Limiter • Flow Limiter Ø Protection Device Against Cylinder Over Fueling Ø Piston Moves With Every Injection Ø Trips at Set Point To Prevent Continuous Injection and Remains Spring Shut Piston CATERPILLAR Common Rail Fuel System
CATERPILLAR Common Rail Fuel System
CATERPILLAR Common Rail Fuel System
- Slides: 23