80 Series Overheating ?

[Moonman]

In the past couple of months I've had the cruiser (96 1HZ with bolt on toyota turbo) heat up on me. Both times I was
towing the boat (Approx 1 Ton) and doing around 115-120km/h @ 3000Rpm. As far as strain on the engine, there
didn't seem to be much and it has plenty more power in reserve. The first time this happened I pulled over and she
bubbled away for a bit, and the second time i backed off and kept cruising and the temp returned to normal. I was thinking
its probably just the thermostat gone, but could there be anything else causing this?

Cheers!
Moonman

[tuff 75]

try wasing your radiator out and maybe even your aircon radiator could be chocked full of mud... if that dont work and u have replace your thermostate then u might have 2 pull your radiator out and take it 2 a radiator fella and get it pulled apart and flushed out.....

[tobie]

had this happen when my 75x had the 1hz and aftermarket turbo, i 1st put two tubes of the silicone fluid from toyota into the fan, this helped a bit, but still overheated so i put it on the dyno and ended up winding the boost down to about 9 psi and that seemed to fix it. ended up packing it in later so i replaced it with a factory turbo

[Chucky]

Redo the fluid in the fan hub.
My whole cooling system was replaced and about a month later started overheating, redid the clutch fluid and all was good. There is a tech thread on how to do this on the board.

[jimbo jones]

this may have been over looked my 80 was doing this and it turned out to be a cracked seal in the radiator cap.

[vSAHARAx]

mums 1HDT used to get hot at 110km/h+ with air-con on and with air-con off it would get hot at 120km/h, took it to the radiator place and it turned out the radiator was bloked so had it all flushed etc etc and havnt had any problems with it since.

Troy

[Moonman]

Had a quick look and the radiator looks physically ok, but haven't had the time to be pulling it out just yet.
Might get a look at it next weekend. Was thinking I would change the thermostat in the mean time as
I have no idea if its ever been changed? Hopefully this will be the quick fix im looking for...

Any other suggestions welcome

Cheers!

[millers1]

I'd reckon as mentioned above its the fluid coupling on the fan, common problem with the 80 series, about $8 from toyota a tube. Regards Steve M

[carts]

I was reading another post of yours Moonman, and you commented that your 80 got somewhere in the vicinity of 16L/100km. If this is the case, I would be guessing that you are overfuelling the 1HZ. If you are overfuelling, this will explain why your cruiser is overheating on a highway run.

In diesels, too much fuel = excessive heat and bad fuel economy,
too little amount of fuel = poor performance