Isuzu 3ld1over heating. engine water pump?

[PeteB]

You say that your radiator is relatively clean, well drain it and clean it properly and fill it with that new waterless fluid that boils at a much higher temp. Also flush out the engine before the refill, another tip is to check the thermosat to see if that is fully opening and that the temp sender unit is signalling at the correct temp.

 

Also check that your blades and shear bars are good and that your air filter is clean. As a dirty air filter and blunt blades increase the load that the engine suffers.

[Dean O]

when I said that the radiator was relatively clean - I meant the fins on the outside not the inside - I haven't inspected the innards at all.

 

fuel tank has all recently been flushed, oil and filters changed.

 

sounds like it may be the thermostat.

Is there a simple way of testing?

 

thanks for guidance all.

[PeteB]

Thermostat can be tested by hanging it in a saucepan of water on the stove top and watch it open as the water heats up. I would be tempted to hoike out the radiator and get it on the bench for a serious core clean.

 

what where the blades and shearbars like?

[mixedangased]

if its a 3.1 td they are prone to head cracks

[Logan]

test thermostat more accurately by having a jam thermometer or similar in the water with 'stat. Somewhere around 97 degrees should be fully open.

 

other method is remove 'stat and simply run machine without, to see what difference.

 

If water pump has lost it's vanes, engine will heat up quickly and radiator should be fairly cool ( not cold as some thermo cycling takes place).

 

Would do these tests first before dropping all fluids etc.

 

If it's control system wiring etc or sensitive oil level sensor etc you could have a goose chase, in which case scratch head and drink tea. Usually helps.

 

All the best, John.

[Mortimer Firewood]

when I said that the radiator was relatively clean - I meant the fins on the outside not the inside - I haven't inspected the innards at all.

 

fuel tank has all recently been flushed, oil and filters changed.

 

sounds like it may be the thermostat.

Is there a simple way of testing?

 

thanks for guidance all.

 

Why flush the fuel tank

[Logan]

Why flush the fuel tank

 

Hello woodchopper, because they fill up with debris from filling up from cans etc also moisture builds up.

 

A couple years ago our cat 312 (13Ton excavator) suddenly stopped, after a lot of faffing found it was this debris had caused the hose from tank to block solid. Cleaned about 1/3 bucket of crud from tank and replaced hose run, about 15m of hose.

 

Cheers, John.