1995 LAND ROVER DISCOVERY Workshop Manual

EMISSION CONTROL
5
REPAIR Rear sensors
9.Release sensor cable from clips.
10.Release multiplug from bracket and disconnect.
11.Unscrew and remove sensor from exhaust pipe
using special tool LRT-12-047 (LST134).Refit
12.Ensure mating faces are clean.
NOTE: New HO2S is supplied pre-treated
with anti-seize compound.
13.If refitting existing HO2S, coat threads with
anti-seize compound.
CAUTION: Do not allow anti-seize
compound to come into contact with HO2S
nose or enter exhaust system.
14.Position HO2S with new sealing washer on
exhaust pipe. Tighten to
20 Nmusing special
tool LRT-12-047 (not RH front sensor).
15.Reconnect multiplug to engine harness and
secure to bracket.
16. RH front sensor only:
Place coil bracket in position and fit nuts. Tighten
to
8 Nm.
CAUTION: Ensure sensor leads are
secured using clips provided. Failure to
correctly secure leads could result in
damage to HO2S.
17.Remove stands. Lower vehicle.

17EMISSION CONTROL
6
REPAIR CATALYTIC CONVERTER/FRONT PIPE - 4.0 V8
Service repair no - 17.50.09
WARNING: The removal of the exhaust
system must only be carried out when the
engine is cold.
Remove
1.Disconnect battery negative lead.
2.Raise vehicle on ramp.
3.Remove oxygen sensors
See Heated Oxygen
Sensor (HO2S) - 4.0 V8
4.Remove 4 nuts/bolts securing front anti-roll bar
brackets.
5.Remove 6 nuts securing front pipe flanges to
manifolds.
6.Remove 2 nuts securing front pipe to
intermediate pipe.
7.With assistance, release front pipe from manifold
flanges.8.With assistance, release front pipe from
intermediate pipe.
9.With assistance, lower anti-roll bar.
10.With assistance, remove exhaust front pipe.
11.Remove flange gaskets and discard.
Refit
12.Reverse removal procedure.

EMISSION CONTROL
7
REPAIR EVAP CANISTER AND PURGE VALVE - 4.0 V8
Service repair no - 17.15.13
Remove
1.Disconnect battery negative lead.
2.Disconnect multiplug from EVAP purge valve.
3.Release purge valve rubber mounting from
bracket.
4.Release clip and remove hose from EAVP
canister.
5.Loosen bolt.
6.Remove EVAP canister and purge valve
complete.
Refit
7.Reverse removal procedure.

17EMISSION CONTROL
8
REPAIRADD: 09/95 EVAP CANISTER - ADVANCED EVAPS
Service repair no - 17.15.13
Remove
1.Disconnect battery negative lead.
2.Release clip securing vent solenoid hose to
canister and disconnect hose.
3.Release vent and purge line quickfit connections
from canister.
4.Remove nut and bolt securing canister to
mounting bracket, collect fixture clamp.
5.Remove canister.
Refit
6.Fit canister to mounting bracket.
7.Position fixture clamp and secure canister to
mounting bracket with nut and bolt.
8.Connect vent and purge line quickfit connections
to canister.
9.Connect vent solenoid hose to canister and
secure with clip.
10.Reconnect battery negative lead.EVAP CANISTER PURGE VALVE - ADVANCED
EVAPS
Service repair no - 17.15.39
Remove
1.Disconnect battery negative lead.
2.Disconnect multiplug from purge valve.
3.Release purge valve rubber mounting from
bracket.
4.Release quickfit hose connections from throttle
body plenum and EVAP canister.
5.Remove purge valve assembly.
Refit
6.Locate purge valve adjacent to bracket.
7.Connect quickfit hose connections to throttle
body plenum and EVAP canister.
8.Conmnect multiplug to purge valve and secure
purge valve rubber mounting to bracket.
9.Reconnect battery negative lead.

EMISSION CONTROL
9
REPAIR ADD: 09/95 EVAP CANISTER VENT SOLENOID - ADVANCED
EVAPS
Service repair no - 17.15.43
Remove
1.Disconnect battery negative lead.
2.Release clip securing hose to vent solenoid and
disconnect hose.
3.Disconnect multiplug from vent solenoid.
4.Remove vent solenoid from mounting bracket.
Refit
5.Fit vent solenoid to mounting bracket.
6.Connect multiplug to vent solenoid.
7.Connect hose to vent solenoid and secure with
clip.
8.Reconnect battery negative lead.

Tdi
1
DESCRIPTION AND OPERATION DESCRIPTION
Air intake
The air cleaner is positioned to the right of the engine
and connected by hoses to a cold air intake duct and
the turbocharger inlet. A crankcase breather hose is
fitted between the air cleaner and the separator.
A single stage turbocharger, fitted between the
exhaust manifold and exhaust pipe, is connected by
hoses to the air cleaner and to an intercooler mounted
on the right of the radiator. The intercooler is
connected by a hose to the inlet manifold.
Fuel system
A 89 litre fuel tank is mounted at the rear of the
vehicle beneath the load space floor. The tank is
vented by a 2 way valve in the filler cap.
A mechanical lift pump, driven by the camshaft, is
mounted on the side of the engine.
A fuel filter, fitted with a replaceable element and
incorporating a water separator, is positioned on the
LH side of the bulkhead.
A Bosch Type injection pump, incorporating a cold
start advance unit and a high idle setting is mounted
on the LH side of the engine and is directly driven by
gears from the crankshaft. The pump meters and
distributes fuel to 4 pintle type injectors located in
pre-combustion chambers in the cylinder heads.
A return line passes excess fuel from the injection
pump and injectors back to the fuel tank.
Glow plugs
Four glow plugs are located in the cylinder head,
directly below each injector.Exhaust gas recirculation (EGR)
Exhaust gas recirculation is controlled by the EGR
control unit mounted in the passenger compartment
on the RH 'A' post behind the fascia and receives the
following inputs:
a. Engine temperature from coolant temperature
transmitter in No. 4 cylinder head.
b. Throttle position from the sensor on the injection
pump.
c. Engine speed from the tachometer.
d. EGR valve lift position.
When all correct signals are received, the EGR
solenoid allows vacuum to open the EGR valve and
recirculate a portion of the exhaust gas.

19FUEL SYSTEM
2
DESCRIPTION AND OPERATION FUEL SYSTEM LAYOUT
1. Fuel tank
2. Fuel lift pump
3. Fuel filter
4. Fuel injection pump
5. Spill return line
6. Fuel injectors
7. Sediment plug
FUEL SYSTEM COMPONENT LOCATION
1. Fuel filter bleed screw
2. Fuel filter
3. Turbocharger
4. Wastegate
5. Air cleaner
6. Fuel injector
7. Glow plug
8. Glow plug controller
9. EGR valve and valve lift position sensor
10. Coolant temperature transmitter - EGR and instruments
11. Fuel injection pump
12. EGR throttle position sensor
13. Fuel lift pump
14. Intercooler
15. EGR Control unit

Tdi
3
DESCRIPTION AND OPERATION