1HZ operating temp

Hmm, didn't even think about trying that. I'll give it a go. Sometimes the simplest things work best. Thanks for the idea.

With the TSVC, are you referring to the viscous hub? I should have mentioned that I did replace it with a new hub & then replaced the silicon fluid ( genuine Toyota) with amount specified by Toyota after no difference was made ( just trying to eliminate all causes of apparent hot running) Genuine Toyota thermostat was used. I am just starting to think I'm reading too much into the gauge as the original is within operating window, maybe the temp readout is accurate & that it reads a bit higher than what I'm used to in other vehicles due to the position of the sender (system outlet straight off the head)

Tony

Yes the TSVC (Temperature Sensitive Viscous Coupling) is indeed the Viscous Hub.

The usual location for a factory fited temp sender is on the engine side of and close to the thermostat, there are a few exceptions to that where the original Ford Falcon had them fitted to the rear of the cylinder head. By fitting the sender to the top radiator hose you are missing out on readings as the engine is warming, and also getting false readings should the thermostat stick shut, but otherwise you will be getting true temp readings.

As you have apparently checked that everything is in good order then I ask if the vehicle was an original build with the Turbo engine, and also if the radiator is specifically for the Turbo engine. Whilst 120 deg temps when working hard for long climbs is not unheard of in the modern vehicles I, like you, would be getting a little nervous when seeing them and knowing that the top of the hill is yet to come.

Most modern vehicle manufacturers deliberatly calibrate their factory fitted 'gauges' so that they do not change from the 'normal' operating temps untill they consider the temp to be abnormal, as they do not want the owners to be complaining under warranty about the fluctuating engine operating temps. In at least one such case the temp 'gauge' does not change between 75 deg and 115 deg when monitored via a Scangauge diagnostic tool.

Do you have a means of measuring the Exhaust Gas Temp (Pyrometer), and is that fitted before or after the turbo?

Regards
Athol

No,the 1HZ is a naturally aspirated engine, the turbo fitted is aftermarket. It has a top mount intercooler. I asked the radiator specialists when they were cleaning it out if they thought the radiator was suitable for turbo charged engine, & they said it was fine for it.
I have a EGT gauge fitted, the sender in the dump pipe post turbo. Max temp it reaches is around 300°c. We have in the past checked temps in other places ( pre turbo ect) & they were all within an acceptable temp range.

Tony
I would be making further enquiries in relation to the radiator size, and in particular if there is a replacement core available with an extra row of tubes, as the fitment of a turbo does increase the heat load generated by the engine.

Whilst the original radiator in good condition may be suffficient during normal operation it is that extra heat load of towing and climbing a long hill when combined with the added heat load generated by the ability to burn more fuel (as that is what a turbo effectively does, more air means more fuel can be burnt = more heat load) can mean that the radiator is no longer suitable for the job at hand.

Regards
Athol

I traveled with a mate who had a similar vehicle and same problems ,fitted a duel core radiator in Darwin solved the problem. Common problem with after market turbo so the radiator man said in Darwin.

Hmm, I might look into the radiator a bit further, It's the only thing left that hasn't been replaced. I'll try another radiator specialist & see what they say. Thanks for the info!

Please let us know when you find the fix as I may be looking at the same issue in the future.
Pete.

You haven't mentioned what model the 1HZ is in. If it is a 75 series or early 78/79, there is an upgrade to a HDJ radiator that will fix all your issuesCMS I have this in my 75 and can vouch for this kit, my old bus runs cool as a cucumber now.

If a 80 or 100 series, I dunno, maybe a fan upgradeQikazz

That Troopy Bloke, it's in a 80 series.

I’m intrigued that your EGT’s max out at 300° but coolant goes through the roof during steep climbs?
My V8 LC ute EGT sits between 300-320° on level going in most conditions, but recently, towing up new Toowoomba Range, EGTs slowly climbed up to 450° in 4th gear, until I backed off a bit & went back to 3rd. Like you, temps rapidly drop once at the top of the climb.

Bob

It has a turbo specific manifold fitted, no adapter. It didn't always run hot, it used to run at quite acceptable temps. It's just got me stumped now that I've checked/double checked/replaced the whole cooling system it won't return to the temps it used to run at.

DOZZER what would you say are a good brand of turbo kit for the 1HZ 80s or what is not.

Thanks,
Pete.

Tony, thanks for posting the outcome.

John, it was after trying your idea that I looked a bit closer at the gauge, I had a small pot of water on the boil in the engine bay on a gas cooker with a thermometer & the sender unit side by side, gauge was reading 120c+ & thermometer was just over 100c. Thanks for the heads up on such a simple idea!

Hi Pete, I purchased the car with the turbo already fitted, all I can tell you is it's a CT26 & HPD top mount intercooler running about 8-10 lb boost. Not enough to hurt the engine but just enough to make it tow etc a bit better. I have talked with a diesel/turbo specialist & he said it's no use trying to run much more boost in these engines. I find it's easier & you get better information if you talk to independant mechanics rather than large franchise operations who are willing to take as much money as possible when it comes to setting things like this up

FSH00, if you live in Melbourne try AXT Turbo in Dandenong. They did my 1HZ in a LC100 many years ago and I had no problems with the installation. Just have to watch the EGT temperatures when going up hills and back off a gear if needed.
Cheers