17
EMISSION CONTROL
INLET THROTTLE (ILT) VALVE
1.
2.
EGR valve vacuum port
EGR valve assembly
3.
Gasket - EGR valve to inlet manifold
4.
ILT valve vacuum port
5.
ILT valve
6.
EGR pipe connection
7.
Exhaust gas intake
8.
ILT valve - butterfly
9.
Intake air
10.
11.
EGR valve open (vacuum applied to EGR valve; ILT valve butterfly shown fully open)
EGR valve closed (no vacuum to EGR valve; ILT butterfly valve shown fully open)
The ILT valve is used on certain exhaust gas recirculation systems in addition to the standard EGR valve
described above. The ILT valve assembly is mounted at right angles to the EGR valve on the left hand side of the
EGR valve assembly. It is fixed to the EGR valve assembly by three screws.
A vacuum port on top of the ILT valve connects to the ILT modulator though a blue, small-bore suction hose.
When a vacuum is applied to the inlet throttle (ILT) valve suction port, a butterfly valve in the inlet manifold closes
via a spindle and lever mechanism, limiting the supply of fresh intercooled air and creating a depression in the
intake manifold which in turn causes a greater suction at the open port to the EGR delivery pipe. When the
vacuum source is removed from the ILT valve suction port, a spring returns the butterfly to its fully open position.
The ILT valve and EGR valve are operated in conjunction to control the proportional masses of fresh intake air
and recirculated exhaust gas that is allowed to flow through to the inlet manifold.
The EGR valve and ILT valve should be replaced as a single assembly.
12
DESCRIPTION AND OPERATION
| Categories | Land Rover, Land Rover Defender |
|---|---|
| Tags | Land Rover |
| Model Year | 1999, 2000, 2001, 2002 |
| Download File |
|
| Document Type | Workshop Manual |
| Language | English |
| Product Name | Defender |
| Product Brand | Land Rover |
| Document File Type | |
| Publisher | landrover.com |
| Wikipedia's Page | http://en.wikipedia.org/wiki/Land_Rover |
| Copyright | Attribution Non-commercial |
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