Outer Limits 4x4 Board

My 3.5 is getting to hot at high revs as follows:

-Low range work at high revs (climbs to 'H")
-High speed ie 80+ kph road (¾ temp)

Have changed thermostat, near new radiator, hoses seem OK. Have just replaced fan with dual thermos (14inch). One is front one behind (Heaps of air flow!) top hose to manifold is clear.

Seems to cool off very quickly at idle (¼ temp) suspect bad crculation or timing up the spout! Have optispark ignition that is set at about 8DEG BTDC

Any other opinions or ideas?

Thank in advance

Tony

If you have put in a "new " radiator and thermostat and thermo fans , you may have an air lock put your Rangee on a hoist with the front wheels only and lift up and remove the radiator plug and run engine till operating temp and see if bubbles come out .
Another poss may be a head gasket so check out the resiouir with a "sniffa" and mech will have one

Is the shroud still fitted behind rad for rear thermo? If not that may be the problem.

Thanks for both your input.

I did a couple of hours of steep uphill work on the weekend so I don't think its and airlock.

I made my own shroud to fit and the fans push heaps of air through the radiator. (You can see it coming out under the engine bay your pants flap in the breeze!)

Would a blown head gasket create pressure? because the pressure seems normal? And what are the symptoms of a head gasket leaking into the coolant area? No bubbles!!

Any other ideas?

you are discribing what was happening to mine last year. I ended up having close to 2/3 of the radiator core blocked. if you can afford it put in the 4 core rangie radiator as it fits straight in and you will never get hot ( till it blocks up).

About the only thing left is the water pump. I'd check the gauge and the t. stat (I know it is new) first, just in case. Place both (t. stat and temp. sender) in boiling water to see they are working correctly

Tony

recore costs about $500, had mine done for my stage 1 now it never gets of cold

Trevor

Check around for recore prices.
Mine cost $250.00 12 months ago.
Michael.