Cooling the 1KZ motor

[Thabogrobler]

Found this usefull, expanatory article!

http://www.landcruiserclub.net/forums/s ... Z-TE-motor" onclick="window.open(this.href);return false;

http://www.toyotasurf.asn.au/forum/view ... hp?t=30503" onclick="window.open(this.href);return false;

[JJBotes]

[JohanM]

As ek die ding so lees is dit duidelik dat hulle voel die termostaat is die culprit maar ook waar hy sit. Dit laat my nou tog wonder, want die 4Y enjin se termostaat sit ook daarso en tog gee hulle nie gekraakte heads nie en ook sukkel mens nie sommer met oorvehitting op hulle nie.

Dalk kan Allan ons hierso bietjie iets leer.

[pietpetoors]

If somebody have a obvious overheating problem, remove the thermostat completely and go and drive the same hill again. See if it is better. If it is better you know it is the thermostat.
My Oupa on the Plaas very often sommer chucked the thermostat out completely. The engine just takes longer to heat up, thats all. Normally in winter he used to put it back.

[Vlak vark]

Just remember that there is a 10mm hole behind the thermostat that must be closed by the thermostat. If not closed or blanked off the water will circilate mainly in the engin and not threw the radiator.

[pietpetoors]

This can become a long discussion and somebody must please correct me if I am mistaken because we do not want to cause any damage to somebody's engine, but Vlak Vark, the waterpump's output pipe is about 30mm big and I guess it pumps water directly to the radiator. So if it have to go via a 10mm hole, most water will not rather go through the 10mm hole than the 30mm hole, it will go where the least resistance is and that will be the big hole.

Or is my reasoning wrong?

[Donkey]

Very interesting read indeed, Thabo, and thanks for sharing. One thing I know I want to replace is the fan, only because I do not know it's age and effeciency, then see if the problem still persists, not that I think I'll know for sure since I won't be driving in the same conditions as we did in Namibia. Then also consider a 76 degree thermostat, but truth be told with our normal temperatures and driving I have no issues at all. Never a cracked head even and motor is sitting now on 328 000 km.

Do you think the small 5mm hole drilled on the thermos, would help?

[pietpetoors]

The hole in the thermostat some people do as safety measure when the thermostat gets stuck. That way it is not fully closed and some water can still go through

[The Legend]

Al wat ek kan se is dat n engine wat nie n termostaat in het nie , langer neem om sy werks temperatuur te bereik en dit veroorsaak meer slytasie op die engine.

Ek is glad nie n voorstander daarvan om n engine sonder n termostaat te ry nie.

Just my 2c

[Thabogrobler]

Al wat ek kan se is dat n engine wat nie n termostaat in het nie , langer neem om sy werks temperatuur te bereik en dit veroorsaak meer slytasie op die engine.

Ek is glad nie n voorstander daarvan om n engine sonder n termostaat te ry nie.

Just my 2c

+1

[Vlak vark]

Die water sal die kortste pad vat. Die water sal eerder sirkileer. As dit deur die verkoeler gaan moet dit al die pad op gaan tot die uitlaat punt wat hoer is as die 10mm gat. As jy n kraan n derde oopmaak het jy klaar vol volume. Daar sal we'll van die water sirkuleer maar die meese sal net in die motor sirkuleer.

[pietpetoors]

OK dit maak sin ja. So dan lyk dit my om die termostaat uit te haal om te toets is nie 'n opsie nie

[Sun Chaser]

Very interesting reading, definitely food for thought.

[Mars]

As die koste van 'n termostaat opgeweeg word teen die koste van 'n nuwe enjin dan maak dit nie vir my sin om die ding nie bloot eenvoudig dadelik te vervang as mens vermoed hy is nie meer lekker nie. Ek vervang as 'n reel 'n voertuig se termostaat na so 5 tot 6 jaar.