Content .. 62 63 64 65 ..

Defender 90 / 110 / 130. Manual - part 64

COOLING

SYSTEM

- .

ENGINE PROTECTION

DRAIN AND

FILL

ENGINE COOLING SYSTEM

. .

To prevent corrosion of

the aluminium alloy engine

parts it is imperative that the cooling system is filled
with a solution

of clean water and the correct type of

anti-freeze, winter and

or water and inhibitor

if frost precautions are not required. Never

fill or

top-up with water only, always add an inhibitor
(Marstons

if anti-freeze is not used. NEVER

salt  water  with  an  inhibitor  otherwise  corrosion  will
occur.  In  certain  territories  where  the  only  available
water  supply  may  have  some  salt  content,  use

only

clean rainwater or distilled water.

Recommended solutions

Anti-freeze

Universal

Anti-freeze

permanent type ethylene base, without methanol, with
a suitable inhibitor

for aluminium engines and engine

Use one part of anti-freeze

one part water.

Inhibitor

Lubricants

SQ36

inhibitor

concentrate.
Use

100

of inhibitor per litre of water.

Anti-freeze can remain

the cooling system and will

provide

protection for two years provided

that the specific gravity of the coolant is checked before

onset

second winter and topped-up with new

anti-freeze as required.
Land Rovers leaving

the

factory have the cooling

system filled with

50% of anti-freeze mixture. This

gives protection against frost down to minus

47°C

(minus

53°F). Vehicles so filled can be identified by a

label affixed to

t h e

windscreen and radiator.

After the second winter the system should be drained
and thoroughly flushed.

adding new anti-freeze

examine all joints and renew

hoses

t o

make

sure that the system

is leakproof. Inhibitor solution

should be drained and flushed out and new
solution introduced every two years, or

where

the purity

of the water is qucstionablc.

See the ‘General specification data’ section

for

protection quantities.

parts.

WARNING: Do not remove the radiator filler cap when

the engine is hot because the cooling system is

pressurized and personal scalding could result.

1. Remove the radiator filler plug.

2. Remove

radiator drain plug and allow

coolant to drain, if neccssary, into

suitable

container. Refit

drain plug and

washer. The

drain plug is situated

on the left-hand side of

radiator towards

t h e

bottom facing the engine

compartment.

NOTE: Disconnect bottom hose to drain on radiators
without a drain plug. Connect hose after draining.

3 . Remove the engine drain plugs, one each side of the

cylinder block, beneath the exhaust manifolds.

Allow the coolant to drain and refit plugs and

washers.

ING S

YSTEM

To drain the expansion tank remove it from the
vehicle, empty, flush-out and refit. If necessary
renew the expansion tank hose.

5 .

Make up a solution

of anti-freeze and water

in a

scparatc container in the concentration required.
The cooling system capacity is quoted

in the data

Therefore to allow for topping up and the

DRAIN AND FILL 2.25 LITRE PETROL AND
DIESEL AND 2.5 DIESEL

SYSTEMS

WARNING: Do not remove the radiator or expansion
tank filler caps when the engine is hot because the

cooling system is pressurized and personal scalding
could result.

1. Remove the expansion tanks and radiator filler

expansion tank make up a quantity

in excess of this

quantity.

6 .

If anti-freeze is not required use Marstons

SQ36 in

the concentration recommended as described under
‘Engine protection’. Make

up a quantity in excess of

capacity for topping up and expansion tank.

7. Make

all drain plugs are tight and fill the system

through the radiator filler

plug until the coolant is

just below the filler neck. Fit the plug but d o not
over tighten.

Half fill the expansion tank with coolant and secure

the cap correctly.

2. Remove the radiator drain plug and allow the

coolant to drain, if necessary into a suitable
container. Refit the drain plug with a new washer.

The plug is located on

t h e

left-hand side

of the

radiator facing the engine

9. Start and run the engine until normal operating

temperature  is  reached.  Allow  the  engine  to  cool
and  check  the  levels  in  the  radiator  and  expansion
tank  and  top up if  necessary.  Finally  check  all  hose
connections for leaks.

...

,:,

.......

. . .

NOTE: Radiator without a drain plug, disconnected

the bottom hose to drain. Reconnect after

3. Remove the cylinder block drain plug, on the left-

hand side

engine, and allow coolant to drain

completely before refitting the plug.

4. To drain the expansion tank, disconnect

hose

from

the

tank to the water pump. Drain and flush

and reconnect the hose.

5 .

Make up

a solution of anti-freeze and water in a

separate container

in the concentration required.

The cooling system capacity can vary

‘Capacities’ under ‘General specification data’.

allow for topping up and the expansion tank prepare
a

quantity

in excess of

capacity of the system

concerned.

6. If anti-freeze is not required, use Marstons inhibitor

SQ36 in the recommended concentration, see under

‘Engine protection’. Prepare a quantity

excess o f

t h e

capacity for topping up and the expansion tank.

7. Check all hoses and drain plugs for security and

the system through t h e expansion tank until
approximately three quarters full.

Fit the expansion tank cap and radiator filler plug
and run the engine until normal operating

temperature

is reached. Allow the engine to cool

completely. Remove the expansion tank cap and if

necessary top up to half full. Remove the radiator
filler plug and check that the coolant level is just

below the filler neck. Finally examine the cooling
system for leaks. Tighten the radiator filler plug to

40-50 Ibs. in.

REMOVING THE RADIATOR

(2.25 litre petrol

and

2.25 and 2.50 diesel)

Disconnect

the

battery.

2. Drain the radiator by removing the drain plug at

the bottom left-hand side of the radiator and
releasing the expansion tank filler cap. See drain

and fill cooling system.

Disconnect the overflow hose from the radiator.

4. The radiator is held in position by two brackets

each secured by three

screws. Remove the screws

and brackets.
Disconnect the top and bottom hoses from the
radiator.

Diesel engine

7. Disconnect

vacuum pump hose from the pump

and release it

from the clips on the radiator cowling.

Petrol engine

8. Disconnect t h e air cleaner hose

from the

carburetter and remove the air cleaner.

9. Release t h e three fixings securing cowling to the

engine.

10. Pull back the cowling towards

radiator and

lift

radiator and cowl.

11. Remove the five screws securing the cowling to t h e

radiator and separate the two units noting that the
cowling is held

bottom of

radiator by two

clips.

continued

OLI

G S

FITTING THE

RADIATOR

14.

12.

13.

Locate the cowling into

clip at the bottom

the radiator and secure

at the top with the five

screws.
Lower

radiator and cowl assembly into position

in the vehicle ensuring that the two pegs

the

bottom

of the radiator locate in the corresponding

rubber pads

in the crossmember

17.

18.

Secure the top

of the radiator with the two brackets

and bolts.
Secure the cowling

to the engine.

Connect the top, bottom and overflow hoses.
Diesel engine

Fit the hose

t o

the vacuum pump and secure

with

the clips on the cowling.
Fit the air cleaner and connect the

to the air

manifold.

All

engines

Check that

radiator drain plug (where fitted) is

tight and

f i l l t h e

cooling system.

A .

Oil from engine to oil cooler.

Cooled

oil

from cooler

to engine.

Start engine and check for oil leaks

e--

-.-+

Content .. 62 63 64 65 ..