Vehicle & Technical > Defender
running hot - help
Dave B:
After checking the electric gauge and regulator etc...
Check for an air lock in the head!...
You can do this when it's cold, if you modify an old rad' cap to take a tyre valve, and presurise the system to at the most 10PSI. (Less than that will do usually, say 5PSI) Then slacken off the highest heater hose where it goes to the heater matrix. Gently let any air out till you get neat coolant, then re-secure the clip. Let the air out of the resoviour and top up as needed.
If your engine is tilted up at the front slightly, then park with the front of the Landy downhill, or jack the rear end up before doing that. Use propper stands, so it doesnt fall off, or reverse up onto a couple of old wheels etc.
Just because you get hot air from the heater in the cab, does not mean you dont have an air lock! Ti's a common problem, but get it sorted, as the ally' head and gasket dont take kindly to being cooked.
It's also worth checking the injection timing, if that's out, it can cause over heating too, but you usualy notice the difference in the way the engine works and sounds. Also check the oil cooler does not have an air lock in, I'll let you figure that out! It can get messy if you are not very careful!.....
Lastly make sure your brakes are not sticking, also common, though you often notice the extra fuel it uses first, and the fact that it will roll to a stop with a bit of a jolt if thats the case.
Enjoy....
Dave B.
TDi90:
cheers dave.
not in the country atm, but will be back soon!!
thanks for all replies
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