Over heating

[Ratman]

Just starting with porous liners?

[openspaceman]

21 minutes ago, briquette_seller said:

Thermostat removed.

Why was this removed? Thermostats  can both open the path to the radiator and simultaneously block the bypass used for quick warm up

[briquette_seller]

3 minutes ago, spuddog0507 said:

 

have you tried it with out rad cap on ? and if you took cap off when hot is it pressurising the system ?

Yes it pressurized when removing the cap when hot.

 

Still runs hot without the cap on, and you can see the water circulating

[briquette_seller]

6 minutes ago, Ratman said:

Does the loader run a compressor driven off the engine that is cooled on the same coolant circuit?

No just the engine being cooled

[Ratman]

Have you put pressure tester on circuit to see if it will hold pressure? In both cold and hot states?

[briquette_seller]

4 minutes ago, openspaceman said:

Why was this removed? Thermostats  can both open the path to the radiator and simultaneously block the bypass used for quick warm up

Yes I've heard that before, so ordered a new thermostat. 

 

I removed it, hoping/thinking the engine would run cooler without it. It has made no difference 

[briquette_seller]

1 minute ago, Ratman said:

Have you put pressure tester on circuit to see if it will hold pressure? In both cold and hot states?

No.

 

What will this prove?

[openspaceman]

2 minutes ago, briquette_seller said:

Yes I've heard that before, so ordered a new thermostat. 

 

I removed it, hoping/thinking the engine would run cooler without it. It has made no difference 

Then I suspect the radiator needs a more thorough clean especially if  it has had any radweld type gunk or a mixture of blue and pink antifreeze.

[briquette_seller]

Just now, openspaceman said:

Then I suspect the radiator needs a more thorough clean especially if  it has had any radweld type gunk or a mixture of blue and pink antifreeze.

No radweld, but could have had a mix of antifreeze. 

 

I'll clean again, but the first time was pretty clean, not gunky at all.........

[Ratman]

Pressurise the system manually using a tester, cold to start with, if pressure drops over a short period of time then your in to the obvious..... theres a leak, check visually first for any external signs i.e hoses, head gasket area, water pump gland, water temp sensor body, the usual etc.....
If no signs then you could be looking at an internal leak, possibly on inlet/exhaust side through a fractured head as husk king suggested earlier. If no pressure drop when cold then it would suggest that you have a internal fault once hot.
So run engine up to temperature, watch your exhaust for signs of grey/white smoke whilst doing this which would also suggest water/coolant loss, and repeat pressure check again?
But if you are having to get to this point then chances are your looking at fractured head or porous liners.
Did you see any pitting on top of block or fretting marks around top of cylinders near where fire ring sits on head gasket? Did you have head faced/skimmed and pressure tested whilst you were changing head gasket?