KIT-SEAL 7X2701 - Caterpillar

Introduction
Illustration 1 g00730195
HEUI Component Diagram (1) Hydraulic pump. (2) Oil flow to engine. (3) Engine oil pump. (4) Injectors. (5) Oil filter. (6) Oil cooler. (7) IAP control valve. (8) IAP sensor. (9) Fuel supply rail. (10) Fuel transfer pump. (11) Secondary fuel filter. (12) Fuel tank. (13) Fuel pressure regulator. (14) Primary fuel filter/water separator. (15) Back of cam gear. (16) Speed/timing sensors. (17) Turbocharger inlet pressure sensor. (18) Throttle position sensor. (19) Batteries. (20) ECM. (21) Coolant temperature sensor. (22) Engine oil temperature sensor. (23) Data link. (24) Inlet air temperature sensor. (25) Fuel pressure sensor. (26) Oil pressure sensor. (27) Turbocharger outlet pressure sensor. (28) Atmospheric pressure sensor.This engine is equipped with hydraulic electronic unit injectors (HEUI). The operation of the HEUI fuel system is completely different from the operation of other fuel systems that are mechanically actuated. The HEUI fuel system is completely free of adjustment. Adjustments to the components that are mechanical can not be made. Changes in performance are made by installing different software in Electronic Control Module (ECM) (20) .This fuel system consists of six basic components:
Hydraulic Pump (1)
Hydraulic Electronic Unit Injector (HEUI) (4)
Injection Actuation Pressure Control Valve (7)
Injection Actuation Pressure Sensor (8)
Fuel Transfer Pump (10)
Electronic Control Module (ECM) (20) Note: The components of the HEUI fuel system are not serviceable. These fuel system components must not be disassembled. Disassembly will damage the components. If the components have been disassembled, Caterpillar may not allow a warranty claim or Caterpillar may reduce the warranty claim.Component Description
Hydraulic Pump
Hydraulic pump (1) (high pressure oil pump) is located at the left front corner of the engine. The hydraulic pump is a piston pump that has a fixed displacement. The hydraulic pump uses an axial piston. The hydraulic pump uses a portion of the engine lubrication oil. The hydraulic pump pressurizes the engine lubrication oil to the injection actuation pressure that is required in order to power the HEUI injectors.Hydraulic Electronic Unit Injector
The HEUI fuel system utilizes a hydraulically actuated electronically controlled unit injector (4) .All fuel systems for diesel engines use a plunger and barrel in order to pump fuel under high pressure into the combustion chamber. This fuel is pumped into the combustion chamber in precise amounts in order to control engine performance. The HEUI uses engine oil under high pressure in order to power the plunger. All other fuel systems use a fuel injection pump camshaft lobe in order to power the plunger. Because the HEUI is much different, a technician must use different troubleshooting methods.The HEUI uses engine lubrication oil that is pressurized from 6 MPa (870 psi) to 24 MPa (3500 psi) in order to pump fuel from the injector. The HEUI operates in the same way as a hydraulic cylinder in order to multiply the force of