Series Land Rover Cooling System Checks - Part 1
Running too hot is not a common problem with Series Land Rovers, thanks mainly to their extra large radiator. This doesn't mean that the sysem should not be checked and serviced though. Running the engine seriously hot can lead to a blown cylinderhead gasket or even partial engine seizure.
It is sometimes overlooked that the oil plays a part in distributing the heat
generated in the cylinders and that the oil sump acts as an oil cooler, so keep its surface clean in hot weather and ensure the oil is topped up.
This is a two part section that aims to go through the critical points of the Series Land Rover cooling system.
1. Check the seal in the radiator pressure cap. If damaged, replace it. Check the radiator cap spring is not too weak to seal properly. A leaking seal causes coolant to boil at a lower temperature.
2. Check the fan belt tension is correct as the fan blades are large and cause a lot of drag when rotating. Also check for leaking coolant under the water pump housing. You will need to replace the pump seal if found - check pump condition if you remove it to change the seal.
3. Large as the Series Land Rover radiator core is, it only cools efficiently when air can pass between the tubes effectively. Clean any dirt or obstructions in the radiator by using a garden hose and/or air blower. Be careful not to damage the very thin tubing though. Leaks are best spotted on a cold radiator.
4. Check top and bottom radiator hoses carefully for thin, hard or cracked sections. Renew the hose if any problems are found before the developing problem finds you.
Check the integrity of all hose clips and replace ageing ones before you need to remove them in earnest. Always use new clips when refitting/replacing hoses.
6. Replace coolant every two years and flush the system before the refill.
7. Time consuming as it may be to remove a Series Land Rover's radiator, if the cooling system does not seem to be performing well, remove the radiator, turn it upside down and flush water through it in reverse direction until clear water emerges.
Series Land Rover Cooling System Checks - Part 2