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From: Hachiroku ハチロク on 23 Nov 2009 20:19
On Tue, 24 Nov 2009 11:34:16 +1100, F Murtz wrote:

> 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?


The fan cowl *should* be a one-piece surround.
Something like this:

http://www.enjukuracing.com/images/OEM%20Fan%20Shroud.jpg

The underpan I was talking about is a plastic pan that attches to the
underside of the car, just in front of the crossbar the suspension is
attached to. It looks like this:

http://www.gdscentral.net/88supra/rockplate1.jpg

On the Supra, anyway, the 'grille' openeing is very small, and the airflow
actually comes in under the bumper. If this pan is missing, the airflow
diverts from the radiator and just passes underneath the car. Probably
good for "ground effects" at thigh speed, but not condusive to air flow to
the radiator...

"Thigh speed"? Reminds me of my college days...


From: F Murtz on 23 Nov 2009 23:35
Hachiroku ハチロク wrote:
> On Tue, 24 Nov 2009 11:34:16 +1100, F Murtz wrote:
>
>> 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?
>
>
> The fan cowl *should* be a one-piece surround.
> Something like this:
>
> http://www.enjukuracing.com/images/OEM%20Fan%20Shroud.jpg
>
> The underpan I was talking about is a plastic pan that attches to the
> underside of the car, just in front of the crossbar the suspension is
> attached to. It looks like this:
>
> http://www.gdscentral.net/88supra/rockplate1.jpg
>
> On the Supra, anyway, the 'grille' openeing is very small, and the airflow
> actually comes in under the bumper. If this pan is missing, the airflow
> diverts from the radiator and just passes underneath the car. Probably
> good for "ground effects" at thigh speed, but not condusive to air flow to
> the radiator...
>
> "Thigh speed"? Reminds me of my college days...
>
>
On this car there is a small sheet of plastic stopping air from under
bumper going to front of radiator. It all goes through grill.
I can not get your first url to work.(second one does) The cowl on my
car only has full wrap round at top and sides, not bottom and I can not
get an exploded picture from my cd manual.There may be a "clip on" lower
part.
From: F Murtz on 23 Nov 2009 23:38
F Murtz wrote:
> Hachiroku ハチロク wrote:
>> On Tue, 24 Nov 2009 11:34:16 +1100, F Murtz wrote:
>>
>>> 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?
>>
>>
>> The fan cowl *should* be a one-piece surround.
>> Something like this:
>>
>> http://www.enjukuracing.com/images/OEM%20Fan%20Shroud.jpg
>>
>> The underpan I was talking about is a plastic pan that attches to the
>> underside of the car, just in front of the crossbar the suspension is
>> attached to. It looks like this:
>>
>> http://www.gdscentral.net/88supra/rockplate1.jpg
>>
>> On the Supra, anyway, the 'grille' openeing is very small, and the
>> airflow
>> actually comes in under the bumper. If this pan is missing, the airflow
>> diverts from the radiator and just passes underneath the car. Probably
>> good for "ground effects" at thigh speed, but not condusive to air
>> flow to
>> the radiator...
>>
>> "Thigh speed"? Reminds me of my college days...
>>
>>
> On this car there is a small sheet of plastic stopping air from under
> bumper going to front of radiator. It all goes through grill.
> I can not get your first url to work.(second one does) The cowl on my
> car only has full wrap round at top and sides, not bottom and I can not
> get an exploded picture from my cd manual.There may be a "clip on" lower
> part.
OOPS I did get url to work but my shroud is a bit different to that.
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