Delphi Multec 3.5 User Manual

Product Description Multec 3.5 Fuel Injector Application Manual
3-2 Delphi Energy and Chassis Systems
Revision: 11/05-1
Figure 3-1 - Top Feed Port Fuel Injection
The Multec 3.5 injector is currently designed with either
• Upper and lower seal rings (Figure 3-2)
• Upper seal ring and lower face seal. (Figure 3-3)
The upper seal ring provides a seal between the rail conduit and the
injector to prevent fuel leakage. The lower seal ring or face seal (at the
discharge end of the fuel injector) prevents the leakage of engine vacuum.
Other functions of the seals are as follows:
• Center the top end of the injector into the fuel rail and the bottom end
into the intake manifold or cylinder head
• Reduce fuel rail and intake or cylinder head thermal conductivity
• Isolate the injector from engine vibration
• Reduce transmission of injector operation noise
Note
Solid contact between the injector and the rail or manifold transfers noise,
vibration, and heat and should be avoided.
• Control fuel system HC permeation
See Section 3.3.5
The injector is typically retained in the fuel rail with a clip. The internal
components of the fuel injector are non-serviceable.
Throttle Control Valve
Fuel Pressure Regulator
Fuel Injector
Fuel Rail
Engine Intake Valve
Air Flow
Fuel Spray

Delphi Multec 3.5 Specifications

General

Brand	Delphi
Model	Multec 3.5
Category	Laboratory Equipment
Language	English