SAFARI

ENGINE

129

1 Radiator

2 Upper water cooling line

3 Auxilliary tank (coolant reservoir)

4 Thermostat

5 Water pump

cap. Blow compressed air or oil/grease dissolved

with water, through radiator fins from engine side

to clean air passages. Do not brush or scrape

radiator core in any way.

Testing for leaks

Remove radiator cap. Suitably plug radiator inlet,

outlet and filling neck. Remove radiator drain cock

adapter.With suitable adapter connect pressurized air

supply to radiator drain cock hole. Submerge radiator

in water tank. Admit air at 1.0 bar (max) into radiator.

Check for leaks and if any suitably mark them. Take out

radiator from water tank. Disconnect air supply

connections. Remove all plugs. Rectify leaks by

soldering, recheck radiator for leakage. Fit back radiator

drain cock adapter. Fit back radiator cap.

Instruction for soldering

Cr-Br. Radiators

Use 40% tin content solder. This solder has higher

tin content and hence lower melting temperature

than used in manufacture of radiator. Use of this will

not have any effect on original soldering near by.

Use non corrosive fluxes for soldering. Neutralize

and wash residues to avoid any consequent

damage. Acid should not be used for this purpose.

DICOR Engine

Pressure valve opening pressure 0.9+ 0.15 kg/cm2

(gauge)

Vacuum valve opening pressure < 0.05 kg/cm2 Max.

Checking cap

Check radiator cap for perfect sealing in filler neck.

Check radiator cap, main and vacuum valve opening

pressures. Replace defective cap with new one of

recommended rating.

Test for main valve opening pressure.

The radiator cap shall be tightened after filling in

with water. The water inside the radiator is

pressurized. Check that main valve opens at

specified pressure of 1.0 kg/cm2

Radiator cap main valve should not open below the

specified pressure value. On the vehicle, the

functioning of radiator cap main valve can be

checked by observing increase in coolant level in

auxiliary tank at high coolant temperature.

Test for vacuum valve opening

The radiator cap shall be tightened without water

inside the radiator and shall be connected to vacuum

pump. Check that vacuum valve opens fully at 0.05

Kg /cm2 vacuum. On the vehicle, the functioning of

the radiator cap vacuum valve can be checked by

observing decrease in coolant level in an auxiliary

tank when it cools down compared to higher level

at high temperature.