Overheating disscussion on Yahoo Surf Forum

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Subject:

Posted By:

caroju Registered User

Posted At:

2/3/04 9:19 am

Sorry its so long, but I did a copy and paste of this discussion on the Yahoo Surf forum. See what you think?

Cam

Sent: Monday, February 02, 2004 4:00 PM
Subject: Re: [Toyota_Surf_Australia] Re: 3.0L Temps.

> I have had overheating problems with a number of the 3.0l diesels,
> there has been a number of cover up short term solutions but the
> real answer I have found came from All Head Services in Victoria who
> have done heaps of research on these due to their inherent overheat
> problems you have described, another way I did reduce overheat to an
> extent was to add a large auto oil cooler, this in tern also has
> reduced the tendency for transmission oil to deteriorate (turn
> tan/brown)and should be considered if sand work is to be regular.

Graham.
Please do tell us more about the inherent overheat problems that are a
result of a design flaw with the 1KZ engine.

Could you also factor into your response the fact that the manufacturer of
these engines (which is not Toyota) does not have a blind clue when they
build them whether or not they are going into a Prado, Hilux Ute, Tokyo
Taxi, Surf, Asia Bus, Dyna truck or a forklift and that somehow there is a
design fault that only makes itself apparent when the engine is fitted to a
Surf?

Except in the case of extreme use (like pulling a trailer load close to
design maximum or plowing along in sand or mud) a transmission cooler is not
a solution to a problem. And in any event the effect of the transmission on
radiator temperature is negligble.

To make matters worse most trans-cooler installations tend to simply stick
the trans cooler onto the front of the radiator. Where does the heat from
the cooler go then ?

> All Head services have found a cavitation problem with the water
> pump,also compouded by poor water jacket design in the cylinder head
> contact them 1800 646988 they will fax you a test procedure to check
> this, Unfortunately although easy to diagnose with the righ test
> proceedure, its not that easy to fix, I have had 2 now where the end
> result was cracked heads, the symtoms you have described have been
> early warning signs in both cracked cylinder heads which we in turn
> originaly treated the symptoms and managed to reduce the overheat
> situation short terms by other means, i.e. thermo fans,auto cooler,
> Castle Hill Toyota also list an Australian condition thermostat,
> approx $25 if I remember correctly.
> All heads have remanufactured the rear water pump housing and water
> pump impellor, and redesigned the cylinder head to incorporate a
> bleed kit which doesnt allow any air pockets or cavitation to happen
> thus increasing heat transfer and eliminating the weak point where
> these heads crack.

I take my hat off to them.
I'm a bit of a bullshit artist myself, but these guys are experts. As
recently as last week I compared the casting number of a 1KZ head fitted to
a surf with the castng number of a current model Prado.

Sadly for "All Heads" the numbers are identical, which means no revisions or
alterations between the two parts.....Whoops.

The themostat is a damm good idea though. But be warned I know that in the
case of the 2L-TE the thermostat housings were different between the local
and import model which meant that simply fitting a local Hi-lux diesel
thermostat was a sure way to have an overheated engine, obviously this may
not apply to the 1KZ-TE, but go into it with eyes open.

> Ill leave them to break the news of the price to you though, its
> pretty scary but may be the ultimate end result.
> weird thing, I havent heard of any similar problems with the same
> engine in other models, only surfs.

Fitting at least two Hiclones will go a long way towards solving the
problem, add a fuel cracking catalyst and your temperature (and fuel mileage
problems) are a thing of the past.

Replies

Overheating disscussion on Yahoo Surf Forum	caroju	2/3/04 9:19 am
Re: Overheating disscussion on Yahoo Surf Forum	RandalG	2/3/04 11:15 am
Re: Overheating disscussion on Yahoo Surf Forum	SGS Surf	2/4/04 7:07 pm
Re: Overheating disscussion on Yahoo Surf Forum	RandalG	2/4/04 7:15 pm
Re: Overheating disscussion on Yahoo Surf Forum	SGS Surf	2/8/04 8:10 am

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toyotasurf down under ... General Mechanical Issues ...... Overheating disscussion on Yahoo Surf Forum

toyotasurf down under
... General Mechanical Issues
...... Overheating disscussion on Yahoo Surf Forum