Cooling Issues

[Witchdoctor]

Thanks Peter
Was looking at a boost gauge.
Will look feel for the rear thermostat in the morning.

Dave

[Witchdoctor]

Just spoke to a specialist diesel person about the problem, with everything that i have done his thoughts on it was it could have a hair crack in the head or it could be a warped head . Will be doing some tests Friday next week( this will cost $$$$$$$$$$)hope this helps.

Dave

[justin]

Dave that don't sound too good! I would have thought, (in my limited experience), that the truck would have shown other symptoms if this were the case. I had a Moke many years ago and the head was warped on that, but once the engine was hot when you took your foot off the accelerator suddenly after traveling at speed it used to blow white smoke, which was coolant seeping into the cylinder. Or you may get oil present in the coolant or at least a loss of coolant? Lets hope its not the case, and have you had the water pump checked BTW? Fingers crossed mate. J

[PeterSchurms]

Good point Justin, Dave if you want a second hand pump I have one in the shed thats yours if you want to try it out.
Pete

[Witchdoctor]

Thanks Justin & Pete,
Replaced the pump with a new one about 8 months ago. The diesel pro said that oil in the coolant did not always happen as that was my first reply. Hoping that it is just a head gasket or i will be looking for a new head. Could be time for a small Toyota alloy V8 ;D ;D.

Thanks guys

Dave

[JustinW]

Talked to my mate last night who has had several Isuzus. He suggests running very high concentration of anti freeze say 1 anti freeze to 3 water. If the vehicle has been run at some stage of its life without enough anti freeze it could have corroded the water ways in the block and blocked a few.

[James W]

Normal conecntration of anti-freeze is 1:1 so 1:3 is actually low conentration.

Also with overheating don't forget you can use the car heater on hot to get ride of some heat, works well when it hits the "fan"...

[Pissy]

Do the V8 option, you know you too Dave?

;D

[JustinW]

maybe he meant 3:1

[geeves]

Remember that anti freeze is 2 things in one. For corrosion you need at least 1 part antifreeze to 3 of water but this doesnt give much protection against freezeing ie only about -5. Here in NZ and esspecialy the areas that James probably goes you need to be able to not freeze down to -20 hence 1/1 ratio. There are special mixtures that allow even colder but these are not readily available in NZ and they boil at lower temps as well If you are going to get realy low temps some people drain there radiators at night.
I saw a documentry on a place called Vorstok in Siberia a while ago. This place exists to keep the siberian railway open and could not exist if it wasnt for a thermal spring that heats all the houses. The trucks used for railway work are heated each morning by running a flameing torch under the whole chassis etc. This is to unfreeze all the fluids and also warm the chassis. They have a big problem with tyres and chassis shattering. A warm winters day therre might get up to -40 but daytime temps rarly excede -60.

[Witchdoctor]

I have been having a blond period the temp gauge i had installed was a F not a Celcius so everything is fine.
When it is 190F it is 85C. I feel like a complete d#*%
The guys that looked at the trucks cooling system where great did the complete tests. Tested the coolant ratio did a cold pressure then hot pressure test also a carbon monoxide test this is done to check for cracks in the head .
So installing did fix the overheating problems .
Thank you all for your imput with this issue.

Q DAD also do general mechanical work for all you Brisbane members & they understand imported Isuzu's

Dave

[justin]

Good news Dave, I have just come back from a session at Peats ridge and the temp never moved even at 140Kms on the Freeway
Mind you as for the 4WDing, well lets say you & I share similar sill shaping now. And I also snapped a CV, it lasted 12 months... Where was that SAS post !!!!!