1999 LAND ROVER DISCOVERY coolant

COOLING SYSTEM - V8
26-2-18 REPAIRS
Thermostat
$% 26.45.09
Remove
1.Drain cooling system.

+ COOLING SYSTEM - V8,
ADJUSTMENTS, Drain and refill.
2.Remove viscous fan.

+ COOLING SYSTEM - V8, REPAIRS,
Fan - viscous.
3.Release 3 clips and disconnect coolant hoses
from thermostat.
4.Remove thermostat. Refit
1.Position thermostat, connect hoses and secure
with clips.
2.Fit viscous fan.

+ COOLING SYSTEM - V8, REPAIRS,
Fan - viscous.
3.Refill cooling system.

+ COOLING SYSTEM - V8,
ADJUSTMENTS, Drain and refill.

COOLING SYSTEM - V8
REPAIRS 26-2-19
Gasket - coolant pump
$% 26.50.02
Remove
1.Remove auxiliary drive belt.

+ CHARGING AND STARTING,
REPAIRS, Belt - auxiliary drive.
2.Drain cooling system.

+ COOLING SYSTEM - V8,
ADJUSTMENTS, Drain and refill.
3.Remove 3 bolts securing pulley to coolant
pump and remove pulley.
4.Release clip and disconnect feed hose from
coolant pump. 5.Remove 9 bolts securing coolant pump,
remove pump and discard gasket.
Refit
1.Clean coolant pump and mating face.
2.Fit new gasket and coolant pump to cylinder
block. Fit bolts and tighten to 24 Nm (18 lbf.ft).
3.Connect feed hose to coolant pump and secure
with clip.
4.Ensure mating faces of coolant pump pulley
and flange are clean. Fit pulley and tighten
bolts to 22 Nm (16 lbf.ft).
5.Fit auxiliary drive belt.

+ CHARGING AND STARTING,
REPAIRS, Belt - auxiliary drive.
6.Refill cooling system.

+ COOLING SYSTEM - V8,
ADJUSTMENTS, Drain and refill.

MANIFOLDS AND EXHAUST SYSTEMS - V8
DESCRIPTION AND OPERATION 30-2-3
1Upper manifold
2Bolt 5 off
3Bolt 1 off
4Gasket
5IAC Valve
6IAC valve hose 2 off
7Bolt 4 off
8Bolt 4 off
9Schraeder valve
10Injector 8 off
11Retaining clip 8 off
12Bolt 12 off
13Bolt 2 off
14Clamp 2 off
15Seal 2 off
16Lower manifold/engine gasket
17Coolant pipe18Bolt 3 off
19Bolt
20Heater return pipe
21Pipe connection
22Lower manifold
23Gasket
24Hose clip 2 off
25Throttle housing coolant hose
26Fuel rail
27Throttle housing
28Gasket
29Bolt 4 off
30Plenum
31Rocker cover breather hose connection
32Brake servo vacuum pipe connection
33Hose clip 4 off

MANIFOLDS AND EXHAUST SYSTEMS - V8
DESCRIPTION AND OPERATION 30-2-5
Description
General
The inlet manifold on the V8 engine is located on the top of the engine, between the cylinders. The manifold directs
intake air into the cylinders. The intake air is mixed with fuel delivered by the injectors prior to ignition in the cylinders.
The inlet manifold comprises three separate aluminium castings.
Two exhaust manifolds are used, one for each bank of four cylinders. Each exhaust manifold allows combustion
gases from the cylinders to leave the engine and directs them into the exhaust system.
The exhaust system is connected to each exhaust manifold and merges into one pipe midway along the underside of
the vehicle. A catalytic converter (where fitted) is located in the front pipe from each manifold. A silencer is installed
midway along the system and a second tail silencer is located at the rear of the vehicle.
Inlet manifold
The inlet manifold comprises three aluminium castings; a lower manifold, an upper manifold and a plenum. The inlet
manifold is located on the top of the engine and feeds air into the cylinders.
Lower manifold
The lower manifold is a one piece machined aluminium casting which locates in the vee on the top of the engine and
is secured to each cylinder head with six bolts per head. A one piece coated metal gasket seals the lower manifold to
each cylinder head and also serves as a cover for the cylinder block.
Eight injectors are fitted into the lower manifold, four on each side. Each injector is sealed in the manifold with O-ring
seals and retained in position by the fuel rails. A fuel rail is attached to each side of the manifold and secured with two
bolts.
Eight air intake ports are cast and machined on the top of the manifold, each port directing intake air into one cylinder.
These ports mate with matching ports in the upper manifold and are sealed with a coated metal gasket between the
two manifolds.
A cavity at the front of the manifold collects coolant flow from the engine. A coolant outlet pipe is sealed and attached
to the front of the manifold and provides for coolant to flow through the cavity in the casting to the radiator top hose.
A smaller port in the manifold also allows coolant to flow from the cavity to the heater matrix. The lower manifold also
locates the Engine Coolant Temperature (ECT) sensor in a port in the front of the manifold.
Upper manifold
The upper manifold is a one piece machined aluminium casting. The manifold has eight ports on its lower face which
mate with the eight ports on the lower manifold. The joint between the upper and lower manifolds is sealed with a
coated metal gasket and secured with six bolts.
The manifold divides from the eight ports into eight branches, four on each side. Each set of four branches merge into
one gallery on each side of the manifold. Each gallery has an opening at its forward end which mates with the intake
plenum.
The upper manifold provides attachment for the Idle Air Control (IAC) valve and for brackets which retain pipes, plug
leads and throttle cables.
Inlet plenum
The plenum is mounted transversely on the front of the upper manifold. The plenum divides into two galleries which
connect with the galleries on the upper manifold. The plenum is secured to the upper manifold with four bolts and
sealed with a coated metal gasket.
The plenum provides attachment for the throttle housing, which is secured with four bolts and sealed with a coated
metal gasket. The plenum also has vacuum connections for brake servo, rocker cover breather and fuel vapour from
the charcoal canister. A port on the top of the plenum connects via a hose to the IAC valve.

MANIFOLDS AND EXHAUST SYSTEMS - V8
REPAIRS 30-2-15
Gasket - inlet manifold - upper - Without
Secondary Air Injection
$% 30.15.24
Remove
1.Release fixings and remove battery cover.
2.Disconnect battery earth lead.
3.Remove bonnet.

+ EXTERIOR FITTINGS, REPAIRS,
Bonnet.
4.Release MAF sensor harness from clip.
5.Loosen clips securing air intake hose. Release
and remove air intake hose.
Note: Pre 03 MY air intake hose illustrated.
6.Disconnect throttle and cruise control cables.
Release cables from abutment bracket and
position aside. 7.Disconnect EVAP pipe from inlet plenum.
8.Disconnect multiplug from throttle body.
9.Remove clip securing breather hose to throttle
body and release breather hose.
10.Position a drain tray beneath the engine to
collect coolant.
11.Release clips securing coolant hoses to
throttle body and disconnect hoses.

MANIFOLDS AND EXHAUST SYSTEMS - V8
30-2-16 REPAIRS
12.Disconnect brake servo vacuum pipe from inlet
plenum.
13.Disconnect breather hose from inlet plenum.
14.Remove bolt securing coolant rails.
15.Release engine harness from bulkhead clips
and position aside.
16.Remove 4 bolts securing ignition coils and
position ignition coils aside. 17.Release plug leads from upper manifold clips.
18.Disconnect multiplug from IACV.
19.Release and disconnect IACV hose.

MANIFOLDS AND EXHAUST SYSTEMS - V8
REPAIRS 30-2-17
20.Remove 6 bolts securing upper inlet manifold
and remove upper inlet manifold.
21.Collect upper inlet manifold gasket. Refit
1.Clean upper and lower inlet manifold mating
faces, dowels and dowel holes.
2.Using a new gasket, position upper inlet
manifold. Fit bolts and, working in a diagonal
sequence, tighten to 22 Nm (16 lbf.ft).
3.Connect hose and multiplug to TP sensor.
4.Connect hose and multiplug to IACV. Secure
hose with clip.
5.Secure ht leads to upper inlet manifold.
6.Position ignition coils, fit bolts and tighten to 8
Nm (6 lbf.ft).
7.Ensure clip under ignition coils is located on
fuel pipe.
8.Secure engine harness in bulkhead clips.
9.Fit coolant rail bolt and tighten to 22 Nm (16
lbf.ft).
10.Connect breather hose to inlet plenum.
11.Connect brake servo vacuum pipe to inlet
plenum.
12.Connect EVAP pipe to inlet plenum.
13.Position coolant hoses to throttle body and
secure hose clips.
14.Fit breather hose to throttle body and secure
clip.
15.Connect multiplug to throttle body.
16.Connect throttle and cruise control cables and
secure in throttle body cams.
17.Adjust throttle and cruise control cables.
l

+ ENGINE MANAGEMENT SYSTEM
- V8, ADJUSTMENTS, Cable - cruise
control.
l

+ ENGINE MANAGEMENT SYSTEM
- V8, ADJUSTMENTS, Cable - throttle.
18.Connect air intake hose and tighten clips.
Secure harness to air intake hose.
19.Top-up cooling system

+ MAINTENANCE, PROCEDURES,
Cooling system..
20.Fit bonnet.

+ EXTERIOR FITTINGS, REPAIRS,
Bonnet.
21.Connect battery earth lead.
22.Fit battery cover and secure with fixings.

MANIFOLDS AND EXHAUST SYSTEMS - V8
REPAIRS 30-2-19
20.Position container to collect spillage.
21.Release clips and disconnect 2 coolant hoses
from throttle housing.
22.Loosen outer cable locknuts and release
throttle and cruise control cables from
abutment.
23.Release throttle and cruise control cables from
clips and throttle cams and position aside.
24.Depress plastic collar and disconnect brake
servo hose from inlet manifold.
25.Release clip and disconnect breather hose
from manifold.
26.Disconnect vacuum hose from manifold.
27.Release engine harness from bulkhead clips
and position aside.
28.Release and remove bonnet seal from rear of
engine bay.
29.Remove 2 bolts securing air pipe and coil
bracket to manifold.
30.Loosen 2 lower bolts securing coil bracket
sufficiently to allow bracket to clear manifold.31.Release plug leads from upper manifold clips.
32.Loosen clip and disconnect air hose from air
valve.
33.Remove 2 nuts securing RH air manifold
support bracket to upper inlet manifold.