Turbo over heating? 86 2.4 diesel

A

andy1990

New member
hello everyone! now before i start i would like to say hello ive just bought a 1986 toyota 4runner SR5 2.4 diesel with a bolt on ARB turbo kit already fitted and i am really enjoying it.

AND that i have had the head tested and they told me that the head is NOT cracked or blown. so this is what ive already done...

I have ready replaced the thermostat, i have flushed the radiator, i have removed the spot lights and the air-conditioning and my winch so there is max air flow to the raditator, the radiator has 3 rows in it and dose not seem to leak.

BUT! it still over heats while on boost after 10 mins at 80-90kms on the highway, it will not over heat around town or will it over heat on boost around town.....

but when im driving on the highway and i go easy on it ( go slow at 70-80kms) and not boost it the whole time it will be a happy chappy and not over heat. it only over heats when on constance boost which is very fun i might add, boost that is not over heating haha. so ive read alot of forums and it seem to come back to a cracked head but its not showing any other signs of it.

also my clutch fan is buggered but i order a new one and will arrive tomorrow. but i wouldnt think that would be the cause?

can anyone help me? thank you

i really like boosting around, i could not Imagen it without the turbo? who would even think of bring out a non turbo model, my dog could out run it.
 
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On any FI motor, you always want to use a quality aluminum radiator and a quality electric fan. Return that clutch fan and invest in an electric unit.
 
This belongs in the "classics" section I believe, as it is more technical oriented.

is the arb setup oil cooled or oil and water cooled?

do you have an intercooler?

I also agree, go for an electric fan. it eliminates your drag and it can kick in on the highway if necessary even if you're at a higher rpm. I suspect you may be boosting too far... do you have a wideband (air fuel ratio gauge)? high boost with not enough fuel will result in a lean condition. I've heard of the knock sensor being disabled on turbo vehicles, so you may not even know its lean. The leaner the hotter.
 
mikebontoft said:
This belongs in the "classics" section I believe, as it is more technical oriented.

is the arb setup oil cooled or oil and water cooled?

do you have an intercooler?

I also agree, go for an electric fan. it eliminates your drag and it can kick in on the highway if necessary even if you're at a higher rpm. I suspect you may be boosting too far... do you have a wideband (air fuel ratio gauge)? high boost with not enough fuel will result in a lean condition. I've heard of the knock sensor being disabled on turbo vehicles, so you may not even know its lean. The leaner the hotter.
Click to expand...

It's a Diesel engine, not a gas engine.



OP, have you checked your air filter, if it is too dirty, the engine can starve for air, and the engine ends up injecting too much fuel for the available air. Which can lead to overheating.

Is the radiator the original that came with the naturally aspirated engine? It might just be insufficient in size to shed the BTU's generated by the now Turbocharged engine. Assuming that everything else is functioning properly, and since you state that this happens at highway speeds, that is also a good thing to consider.

When you are driving, is the exhaust always heavy with particulates (black smoke)? If it is, you might be injecting too much fuel. A puff of black smoke is normal when first accelerating.

Do you have an EGT (exhaust gas temperature) gauge? 1250° F is about the maximum temperature you would want to see.

Let us know. And good luck.
 
ah nuts. It is a diesel. my apologies. I thought it was at first, but remembered 2.4 and add-on turbo so I thought he had a 22ret.

In this case then, diesel has cold, slow moving exhaust (obviously not that cold) and I recommend checking egt as mentioned above.

by the way, if you ever feel the need to gain a lot of power and use really cheap fuel, look into compressed natural gas conversion... $1.30 a gallon equivalent and a power increase thats nothing to sneeze at.
 
mikebontoft said:
This belongs in the "classics" section I believe, as it is more technical oriented.

is the arb setup oil cooled or oil and water cooled?

do you have an intercooler?

I also agree, go for an electric fan. it eliminates your drag and it can kick in on the highway if necessary even if you're at a higher rpm. I suspect you may be boosting too far... do you have a wideband (air fuel ratio gauge)? high boost with not enough fuel will result in a lean condition. I've heard of the knock sensor being disabled on turbo vehicles, so you may not even know its lean. The leaner the hotter.
Click to expand...

hey, umm waht do you mean im boosting to far as in driving to far of a distance? and i dont have a inter-cooler i really didnt think it would fit.... ;/ ok ok ok ok, so wait if i take this stupid turbo kit off this should fix all my problems??? becasue boost dosnt even kick in untill 2800 rpm and thats reving the guts out of the poor thing anyways. sorta dosnt help me when i think about it. or dose it?

and about the radiator its a 3 core or 3 row. which is bigger then standard it looks like it has been re cored. i put toyota coolant in it :D that helps a bit you know i noticecd the difference.

i found also when you say the word hill it over heats and when you got up a hill it over heats haha so it only over heats when boosting up a hill or under load alot.

im going to blow up my motor soon so if anyone could get back to me that would be great.

thanks

and about the black smoke i think its more white smoke/ grey smoke but dont hold me to that as hard to see, it looks grey at night time in the car lights behind me!

AND ITS OIL COOLED TURBO!!

and i run the best fuel vortex diesel. (in Australia anyway) also its like 40 degrees over here.... during the day.


also i cant work out how to move it to classic section... if anyone could do it for me that would be great. thanks
 
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I should have specified... boosting too much meant that you might be overboosting or again in other words higher PSI than it is tuned for. This can allow your intake temperature to increase higher than it should and your EGT will (likely) rise. I say likely because I'm familiar with turbocharging DIESELS, however the idea is still the same. Increased combustion temperature equals increased exhaust gas temperature.

So when you say "going up a hill" or other high load, high boost events, you are likely pushing that air charge (intake) temperature above the limit. Since the engine is now burning much hotter, that radiator is inadequate. This is the purpose of an intercooler. Just like an AC condenser, but for the air post-compressor.

edit: I should also add that the pressure alone does not increase temperature, but as you add the extra air, extra fuel is required. If you boost past the maximum programmed reading, the computer has no idea and will not add extra fuel.
 
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mikebontoft said:
I should have specified... boosting too much meant that you might be overboosting or again in other words higher PSI than it is tuned for. This can allow your intake temperature to increase higher than it should and your EGT will (likely) rise. I say likely because I'm familiar with turbocharging DIESELS, however the idea is still the same. Increased combustion temperature equals increased exhaust gas temperature.

So when you say "going up a hill" or other high load, high boost events, you are likely pushing that air charge (intake) temperature above the limit. Since the engine is now burning much hotter, that radiator is inadequate. This is the purpose of an intercooler. Just like an AC condenser, but for the air post-compressor.

edit: I should also add that the pressure alone does not increase temperature, but as you add the extra air, extra fuel is required. If you boost past the maximum programmed reading, the computer has no idea and will not add extra fuel.
Click to expand...


ok i get ya now :) its set to 10 psi, i only drove 50kms before i hit a few hills and then it started over heating. WHAT!! 1986 and it has a computer! i didn't know that. and so you think i need a bigger radiator more like a 4 row? because it has a 3 row and standard dosnt it have a 2 row?
 
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Looks like I worded that weird....your radiator is fine. You should be looking at an intercooler for those hard boosting sessions.
 
no worries, your best bet is to find a good spot to mount one and have some new charge pipes made... or try for a "universal" kit.
 
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