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From: F Murtz on 22 Nov 2009 04:33
Overheating problems, I have replaced the head gasket, new silicone oil
in fan, temporarily removed thermostat, tried sodium silicate treatment
in case I missed small cracks when replacing gasket.how many degrees
does timing have to be out to cause this? any other ideas?
after I did head I got codes 25 and 26 but I reset and they did not return.
From: Hachiroku ハチロク on 22 Nov 2009 16:50
On Sun, 22 Nov 2009 20:33:57 +1100, F Murtz wrote:

> Overheating problems, I have replaced the head gasket, new silicone oil in
> fan, temporarily removed thermostat, tried sodium silicate treatment in
> case I missed small cracks when replacing gasket.how many degrees does
> timing have to be out to cause this? any other ideas? after I did head I
> got codes 25 and 26 but I reset and they did not return.

Ugh. New silicone oil in the fan clutch? What a PITA...

Do a spin test, if you haven't already. With the engine stone cold, spin
the fan. It should spin sort of freely. THen run the engine up to full
operating temp, and when you stop the car, spin the fan again. It should
be stiffer. If the engine is really warm it should really be stiff.

I replaced the whole clutch, and after I did I can *HEAR* the fan come on.
This solved all my problems as far as overheating (88 Supra)



From: Ray O on 22 Nov 2009 21:39

"F Murtz" <haggisz(a)hotmail.com> wrote in message
news:4b090581$1(a)dnews.tpgi.com.au...
> Overheating problems, I have replaced the head gasket, new silicone oil in
> fan, temporarily removed thermostat, tried sodium silicate treatment in
> case I missed small cracks when replacing gasket.how many degrees does
> timing have to be out to cause this? any other ideas?
> after I did head I got codes 25 and 26 but I reset and they did not
> return.

Base ignition timing that is too advanced can cause overheating, but you
would probably experience pinging if it is advanced enough to cause
overheating.

Do hachiroku's test to check the fan clutch, or use a hair drier or heat gun
to see if the clutch becomes harder to spin when it is warmed up.

What is the condition of the radiator? Does coolant circulate freely and
are the fins clear of debris and deformations?

Is the fan shroud in place?
--

Ray O
(correct punctuation to reply)


From: Hachiroku ハチロク on 22 Nov 2009 22:18
On Sun, 22 Nov 2009 20:39:06 -0600, Ray O wrote:

>
> "F Murtz" <haggisz(a)hotmail.com> wrote in message
> news:4b090581$1(a)dnews.tpgi.com.au...
>> Overheating problems, I have replaced the head gasket, new silicone oil
>> in fan, temporarily removed thermostat, tried sodium silicate treatment
>> in case I missed small cracks when replacing gasket.how many degrees
>> does timing have to be out to cause this? any other ideas? after I did
>> head I got codes 25 and 26 but I reset and they did not return.
>
> Base ignition timing that is too advanced can cause overheating, but you
> would probably experience pinging if it is advanced enough to cause
> overheating.
>
> Do hachiroku's test to check the fan clutch, or use a hair drier or heat
> gun to see if the clutch becomes harder to spin when it is warmed up.
>
> What is the condition of the radiator? Does coolant circulate freely and
> are the fins clear of debris and deformations?
>
> Is the fan shroud in place?

And the underpan?



From: F Murtz on 23 Nov 2009 19:34
Hachiroku ハチロク wrote:
> On Sun, 22 Nov 2009 20:39:06 -0600, Ray O wrote:
>
>>
>> "F Murtz"<haggisz(a)hotmail.com> wrote in message
>> news:4b090581$1(a)dnews.tpgi.com.au...
>>> Overheating problems, I have replaced the head gasket, new silicone oil
>>> in fan, temporarily removed thermostat, tried sodium silicate treatment
>>> in case I missed small cracks when replacing gasket.how many degrees
>>> does timing have to be out to cause this? any other ideas? after I did
>>> head I got codes 25 and 26 but I reset and they did not return.
>>
>> Base ignition timing that is too advanced can cause overheating, but you
>> would probably experience pinging if it is advanced enough to cause
>> overheating.
>>
>> Do hachiroku's test to check the fan clutch, or use a hair drier or heat
>> gun to see if the clutch becomes harder to spin when it is warmed up.
>>
>> What is the condition of the radiator? Does coolant circulate freely and
>> are the fins clear of debris and deformations?
>>
>> Is the fan shroud in place?
>
> And the underpan?
>
>
>
Ta thanks for info
Do you know if there is a lower part to the fan cowl?
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