Land Rover Defender V8i Workshop Supplement Rover Manual

							4.0 V8i
1
SPECIFICATIONS, TORQUE TORQUE VALUES
Engine V8i Nm lbf.ft)
Crankshaft pulley bolt 270....................................................... 200
Camshaft gear bolt 58........................................................... 43
Timing cover / coolant pump bolts*** 22............................... 16
Rocker cover to cylinder head 8.......................................... 6
Rocker shaft bracket to cylinder head 38.............................. 28
Spark plug 15........................................................................ 11
Cylinder head bolts:*
Stage 1: 20................................................................... 15
Stage 2: then 90° ................................................................... then 90°
Stage 3: further 90° ................................................................... further 90°
Alternator / steering pump bracket to cylinder head 30......... 22
Lifting bracket to cylinder heads 40....................................... 30
Power steering hose unions:
14 mm 15..................................................................... 11
16 mm 20..................................................................... 15
Power steering pump heat shield 25..................................... 18
Drive belt tensioner 50.......................................................... 39
Drive plate to converter 45.................................................... 33
Drive plate to crankshaft 45.................................................. 33
Drive plate hub aligner to crankshaft socket head screws 85 65
Bell housing bolts 46............................................................. 34
Access plate 9..................................................................... 7
Bell housing cover plate 9................................................... 7
Main bearing cap rear bolts:
Stage 1: 13................................................................... 10
Stage 2: 72................................................................... 53
Oil sump drain plug 43.......................................................... 32
Oil sump to cylinder block 23................................................ 17
Starter motor bolts 45............................................................ 33
Starter motor heat shield 9.................................................. 7
Oil cooler pipe unions to gearbox 30..................................... 22
Tie bar to gearbox 45............................................................ 33
Gearbox breather pipe bracket 9........................................ 7
Engine harness bracket 9................................................... 7
Engine mountings to engine and chassis 55......................... 40
Engine mounting rubbers to brackets 30.............................. 22
Compressor heat shield 25................................................... 18
* Lightly oil threads prior to assembly
** Apply Loctite 222 to threads before assembly
*** Apply Loctite 577 to threads before assembly 
						

							12ENGINE
2
SPECIFICATIONS, TORQUE
NOTE: The following torque values are for screws and bolts not specified in the previous table.
METRIC Nm lbf.ft
M5 6........................................................................... 5
M6 9........................................................................... 7
M8 25........................................................................... 18
M10 45......................................................................... 33
M12 90......................................................................... 65
M14 105......................................................................... 75
M16 180......................................................................... 130
UNC / UNF
1/4 9........................................................................... 7
5/16 25......................................................................... 18
3/8 40........................................................................... 30
7/16 80......................................................................... 60
1/2 90........................................................................... 65
5/8 135........................................................................... 100 
						

							17 - EMISSION CONTROL
CONTENTS
Page
DESCRIPTION AND OPERATION
EMISSION CONTROL 1.........................................................................................
EXHAUST SYSTEM 2.............................................................................................
EVAPORATIVE EMISSION CONTROL SYSTEM 4...............................................
FAULT DIAGNOSIS
TESTING EVAPORATIVE EMISSION CONTROL 1..............................................
REPAIR
EVAP CANISTER AND PURGE CONTROL VALVE 1...........................................
VAPOUR SEPARATOR 2.......................................................................................
FRONT PIPE / CATALYTIC CONVERTER 3.......................................................... 
						

							EMISSION CONTROL
1
DESCRIPTION AND OPERATION EMISSION CONTROL
Three systems are used to control the vehicle
atmospheric emissions, these are:
- Engine crankcase fume emissions.
- Fuel tank evaporative emissions
- Engine exhaust gas emissions.
Crankcase ventilation system
The crankcase ventilation system, which is an integral
part of the air supply to the engine combustion
chambers, is often overlooked when diagnosing
problems associated with engine performance. A
blocked ventilation pipe or excessive air leak into the
inlet system through a damaged pipe or leaking
gasket can affect the mixture, performance and
economy of the engine.The purpose of the crankcase ventilation system is to
ensure that any noxious gas generated in the engine
crankcase is rendered harmless by burning in the
combustion chambers as follows:
Oil laden noxious gas in the engine crankcase is
drawn through an oil separator located in the RH
cylinder head rocker cover, where the oil is separated
and returned to the sump. The gas flows through a
restrictor and via a hose into the inlet plenum chamber
where it is drawn into the combustion chambers and
burned. The volume of fresh air which is drawn from
the atmospheric side of the throttle butterfly, via a
hose into the LH rocker cover to mix with the gas,
depends on the position of the throttle and the engine
speed.
As the throttle opening increases, manifold depression
increases, and at a given point, the crankcase gases
are drawn into the throttle housing. This reversal helps
to prevent excessive crankcase pressure or
depression developing. 
						

							17EMISSION CONTROL
2
DESCRIPTION AND OPERATION EXHAUST SYSTEM
1.Manifold to front pipe connection.
2.Oxygen sensor.
3.Front silencer support bracket.
4.Front pipe to silencer joint.
5.Silencer rear support bracket.
6.Rear silencer support bracket. 
						

							EMISSION CONTROL
3
DESCRIPTION AND OPERATION Exhaust emission control.
The multiport Sequential Fuel injection (SFi) system
provides accurately metered quantities of fuel to the
combustion chambers to ensure the most efficient air
to fuel ratio under all conditions of operation. A further
improvement to combustion is made by measuring the
oxygen content of the exhaust gases to enable the
quantity of fuel injected to be varied, according to
conditions, to correct any unsatisfactory composition
of the exhaust.
The main components of the exhaust emission
system are two catalytic converters which are an
integral part of the front exhaust pipe assembly. The
catalytic converters are included in the system to
reduce the emission, to atmosphere, of carbon
monoxide, oxides of nitrogen, and hydrocarbons. The
active constituents of the converters are platinum and
rhodium. The correct functioning of the converters is
dependent upon close control of the oxygen
concentration in the exhaust gas entering the catalyst.
The oxygen content of the exhaust gas is signalled to
the Engine Control Module (ECM) by Heated Oxygen
Sensors (HO2s) located in the exhaust front pipes.
The ECM can then make an appropriate adjustment to
the fuel supply to correct the composition of the
exhaust gases.
CAUTION: Unleaded fuel only must be
used on vehicles fitted with catalytic
converters. As a reminder a label to
indicate this is adhered to the inside of the fuel
filler flap. As a further safeguard, the filler neck is
designed to accommodate only unleaded fuel
pump nozzles. 
						

							17EMISSION CONTROL
4
DESCRIPTION AND OPERATION EVAPORATIVE EMISSION CONTROL SYSTEM
The system is designed to prevent harmful fuel vapour
from escaping to the atmosphere. The system
consists of a vapour separator tank, connected to the
fuel tank and located between the body inner and
outer panels on the right hand side of the vehicle near
the rear wheel arch. An Evaporative Emissions
(EVAP) canister, containing activated charcoal, is
positioned in the engine compartment attached to the
front right valance. The two components are
connected by a pipe running the length of the chassis.
A Pressure relief to atmosphere.
B From fuel tank to separator.
C To evaporative emissions canister.
D Pressure relief valve.
E Pressure relief valve.
F Shut-off valve.
G Speed Fit connectors.A pressure relief valve is fitted in the hose which is
open to atmosphere. This valve acts as a safety valve
should a build-up of pressure occur in the system, for
example if a hose became blocked or kinked. The
volume of vapour emitted, in such an instance, would
be limited.
A pressure relief valve is also fitted in the hose
connected to the adsorption canister and releases
vapour to the canister when the pressure in the
separator reaches between 5 and 7 Kpa (0.7 and 1.0
lbf/in
2).
In the top of the separator a shut-off valve is
incorporated in the vapour exit port to prevent the
possible presence of any liquid fuel being transmitted
to the EVAP canister should the vehicle roll over.
The EVAP canister, which is connected by a hose to
the plenum chamber, absorbs and stores the fuel
vapour from the fuel tank while the engine is not
running. When the engine is started, the vapour is
purged from the canister by air drawn through an
orifice in the base of the canister and by the influence
of vacuum at the top. The vapour drawn into the
plenum chamber through a solenoid operated purge
valve is finally burnt in the combustion chambers.
The purge valve, which is attached to the EVAP
canister support bracket, is controlled by the Engine
Control Module ECM which determines the optimum
time at which purging should take place. This will
normally be at engine speeds above idle and when
the vehicle is in motion. A signal from the ECM to the
purge valve operates the solenoid and opens the
valve to purge the canister of fuel vapour. 
						

							EMISSION CONTROL
5
DESCRIPTION AND OPERATION
1. Vapour separator and pipes
2. Non-return valve to atmosphere
3. Pipe from fuel tank
4. Pipe to EVAP canister
5. EVAP canister and purge valve
6. Fuel tank