overheating on GU TD4.2

[bundyboy]

i found out my spotlights were causing some pretty major overheating after about 1/2 hour of highway driving. The spotlights are off but i am interested in ways to cool the engine better.

Summer here is average 45 degrees. Does the nissan bonnet scoop make a difference?

[runnin4life]

if you have a top mount inter cooler than yes it does

[Daisy]

bonnet spacers ??? raise rear part by about 10mm/20mm to force hot air out..

Or a nissan scoop in reverse to force the air out??

Air i think its being jammed up in the engine bay to be heated up fairly quickly and doesnt allow a flow thru effect

Raisin the bonnet at the back woudl force the air to go thru a lot quickly wouldnt it

TOM

[mickyd555]

chack out the thread in general tech ........"bonnet louvres" its preety good. and youll find that the two ideas youve been given are not too flash. this is according to others, not me, i dont really know. the advice in the other thread seems to make sence to me but.

[morkz]

check the radiator as well maybe give it a flush as well give it a proper clean

also if your running large spotties like LF you may also be restricting alot of air flow which isnt a problem in normal areas but where you are may cause some problems

[Dodger]

We have had locusts in our area so i had to take my radiator out and clean it . There was a great deal of rubbish caught between the Air con evaporator and the radiator. Check it out.

[bundyboy]

yeh the cause of the overheating was the lightforces on the front but i am still interested in ways of cooling it more as i want to be confident in it when i do the kimberleys trip.

[mickyd555]

bundy boy, were the lights only causeing the excess heat while they were on, or was it because they are blocking up the front of the radiator?

i wana fit some hella rallayes 4000's to the front of my GU and im interestedin your problem, so as i dont make the same mistake.

[Tooheys]

As far as I know GU's are renowned for overheating because of their small restrictive turbo and exhaust. It makes the underbonnet temps way too high when you work them hard or go over 120km/hr. My old man has the same problem with his and he is either going to get DTS to do the turbo upgrade which fixes the problem or get one of those triple bypass radiators. Ive seen another bloke get around the problem by putting the ac condenser on the roof of a GU so the radiatior got max flow but i reckon thats a bit of a crap fix and it looked ugly.

[bogged]

yeh the cause of the overheating was the lightforces on the front but i am still interested in ways of cooling it more as i want to be confident in it when i do the kimberleys trip.

Try the thread as posted above... theres HEAPS of info on how to cool.

[morkz]

there was an article in 4wd monthly a guy had 4.2 GU wagon was over heating bit because of all the shit in the way.

i reckon your better off putting a larger radiator in thats the main problem there. then you should definatly have no problems.

in reguards to doing a DTS upgrade is it really necessary i dont think so the standard setup isnt that bad.

your better off getting the truck tuned and making it perform better and thus should reduce higher EGT's. but my all means if you want to spend the money do it or for the same amount u could tune and get lockers

[GUJohnno]

bundy boy, were the lights only causeing the excess heat while they were on, or was it because they are blocking up the front of the radiator?

i wana fit some hella rallayes 4000's to the front of my GU and im interestedin your problem, so as i dont make the same mistake.

I have a TD-6 with Rallye 4000's and the only time I've had it get a bit warm was after going through a large bog hole and the radiator was chockers full of mud. A bit of ime with the pressure cleaner and all's been good since.

[toughnut]

yeh the cause of the overheating was the lightforces on the front but i am still interested in ways of cooling it more as i want to be confident in it when i do the kimberleys trip.

I've got a set of lightforce 240's on the front and they don't cause much drama at all. I'd get your radiator checked first cause it might save you big $$$$. If that's not the problem and you've got a bit of spare cash lyin around you could get a PWR alloy radiator. They make one to bolt straight in and is about 20mm thicker than standard and as stated is alloy. They cost around $1000 - $1200 I think.

[bundyboy]

Guys, The problem here was the spotties obstructing the airflow....

I must emphasize that the temperatures are around 44-46 degrees celcius at the moment here. I got 40km out of town doing 110km/hr and it started boiling. It as a brand new thermostat in it as i replaced it after the first time it did it.

The second time forced me to try taking the spotties off. This was on the side of the road, i let it idle for 5 mins and return to a normal temp. while i took them off. I then carried on drving and drove all the way to Karijini National Park with it at normal temp. (another 150km).

It is fine now but i am going to look at ways of improving cooling as at extreme temperatures in summer here it may still prove a problem over long distances.

[morkz]

Guys, The problem here was the spotties obstructing the airflow....

thats why i reckon you should put a higher quality radiator.

not move the lights

i know its hot over there so the best thing to do is cool it down have something with twin thermo's cause if your going out the middle of no where and carrying a load its going to heat up and the same guy in 4wd monthly tried different things such as bonnet scope and stuff but it didnt do the trick he ended up having to get a larger radiator or somthing that is more efficient.

[toughnut]

Once my truck is upto temp the guage doesn't move no matter what I'm doing now that I've got the new radiator in.

[GQ TROL]

Has anyone looked at modifying the water pump to slow down the coolant flow through the radiator so it gets maximum exposure?? Have toyed with the idea of "de-gearing" the water pump by approx 50% by using a larger pulley (& therefore belt too) and seeing how things go?

Alternatively, a wiper arm assembly instead of the traditional impellor inside the water pump? Any thoughts??

Cheers
Mitch

[patrolmad]

Dog the OE radiator and fit a 4.8 radiator. They are mush bigger. I did and the vehicle has never run cooler even towing in 50 degree ambient temperatures.