Range Rover Classic. Manual — part 34
EMISSION CONTROL
1
FAULT DIAGNOSIS
TESTING EVAPORATIVE EMISSION CONTROL
The following pressure test procedure is intended to
provide a method for ensuring that the system does
not leak excessively and will effectively control
evaporative emissions.
Equipment required.
Nitrogen cylinder (compressed air may be used to
pressure the system when there has NEVER been
fuel present in the fuel or evaporative control
systems).
Water manometer (0 - 30" H2O or more).
Pipework and a "T" piece.
Method.
1. Ensure that there is at least two gallons of fuel in
the petrol tank unless there has never been any
fuel in the system.
2. Disconnect, at the adsorption canister, the pipe
to the vapour separator.
3. Connect this pipe to the nitrogen cylinder and
the water manometer using the "T" piece.
4. Pressurize the system to between 26.5 and 27.5
inches of water, allow the reading to stabilize,
then turn off the nitrogen supply.
5. Measure the pressure drop within a period of 2
minutes 30 seconds. If the drop is greater than
2.5 inches of water the system has failed the
test. Note that a fully sealed system will show a
slight increase in pressure.
6. Should the system fail the test, maintain the
pressure in the system and apply a soap
solution round all the joints and connections until
bubbles appear to reveal the source of the leak.
7. Repeat the test and if successful, dismantle the
test equipment and reconnect the pipe to the
adsorption canister.
EMISSION CONTROL
1
REPAIR
POSITIVE CRANKCASE VENTILATION AIR
INTAKE FILTER
Service repair no - 17.10.02
The PCV air intake filter is located at the rear of the
left hand rocker cover, beneath the throttle linkage
bracket.
Remove
1. Pry the filter outer cover upwards to release it
from its mounting.
2. Remove the sponge filter from the cover and
discard the sponge.
Refit
3. Insert a new filter into the filter cover.
4. Press the filter onto its mounting until it clips
firmly into position.
POSITIVE CRANKCASE VENTILATION BREATHER
FILTER
Service repair no - 17.10.03
Remove
1. Release the hose clamp and pull the hose off the
canister.
2. Unscrew the canister and remove it from the
rocker cover.
3. Remove the large rubber ’O’ ring and inspect for
deterioration.
4. Visually inspect the condition of the wire screen
within the canister, if in poor condition, replace
the whole assembly, if the filter unit is in an
acceptable condition, clean as follows.
5. Immerse the canister in a small amount of
solvent (mineral spirits) and allow time for the
solvent to dissolve or loosen any debris.
6. Remove the canister from the solvent bath and
allow to dry in still air.
WARNING: Do not use a compressed air
line to dry, clean or remove any remaining
particles of debris within the canister as
this could cause fire or personal injury.
Refit
7. If the original canister is being refitted, fit a new
’O’ ring.
8. Screw the canister into the rocker cover securely
- hand tight only.
9. Refit the hose and tighten the hose clamp
securely.
17
EMISSION CONTROL
2
REPAIR
LAMBDA (OXYGEN) SENSOR
Service repair no - 19.26.16
The removal of the sensors from the exhaust system
must only be carried out when the engine is cold.
Remove
1. Disconnect battery negative lead.
2. Disconnect the electrical plugs from the sensors.
3. Unscrew and remove the sensors from the two
exhaust downpipes.
Refit
4. Coat the threads of the sensors with anti-seize
compound.
CAUTION: To ensure that the efficiency of
the sensor is not impaired, DO NOT allow
anti-seize compound to come into contact
with the sensor nose.
5. Screw in the sensor and tighten to the correct
torque using special tool LST134.
6. Connect the electrical plugs and battery lead.
PURGE CONTROL VALVE
Service repair no - 17.15.39
Remove
1. Disconnect battery negative lead.
2. Disconnect multiplug from purge control valve.
3. Release clip and disconnect hose from valve.
4. Release valve from charcoal canister.
5. Remove valve.
6. Discard ’O’ ring.
Refit
7. Clean valve and valve location.
8. Fit new ’O’ ring to purge valve.
9. Position and secure valve to charcoal canister.
10. Connect hose to purge valve and secure with
clip.
11. Connect multiplug to valve.
12. Reconnect battery negative lead.
EMISSION CONTROL
3
REPAIR
CHARCOAL CANISTER
Service repair no - 17.15.13
Remove
1. Disconnect battery negative lead.
2. Pry out purge valve.
3. Disconnect pipe.
4. Loosen bolt.
5. Remove charcoal canister.
Refit
6. Reverse removal procedure.
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