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From: Tegger on 25 Nov 2009 20:53
=?iso-2022-jp?q?Hachiroku_=1B$B%O%A%m%=2F=1B=28B?= <Trueno(a)e86.GTS> wrote
in news:pan.2009.11.26.01.44.00.634496(a)e86.GTS:

> On Wed, 25 Nov 2009 18:53:42 -0500, Steve Austin wrote:
>
>> muzician21 wrote:
>>> 89 Cressida w/7MGE - I just started seeing my oil pressure light going
>>> on today at low rpm - basically below about 800 rpm, particularly when
>>> in gear. Assuming the sensor is correct, is there any reason for this
>>> besides the oil pump? The engine only has about 40k miles since a
>>> rebuild, re-used the old oil pump which I assume is the original. Car
>>> has about 150k miles on it.
>>>
>>> What's the life expectancy of these pumps?
>>>
>>> Besides Ebay any good source for parts? Dealer wants most of $300 for
>>> one, the auto parts places apparently don't have it.
>>>
>>> Thanks for all input.
>>
>> Lol. Got a Fram filter on it? (As I duck for cover)
>
> AARRRGGGGGHHHHHH!!!!!!!!!!!!
>
> (I bet he does!)
>



That would make zero difference to oil pressure.



--
Tegger

From: Jeff Strickland on 25 Nov 2009 20:56

"Hachiroku ????" <Trueno(a)e86.GTS> wrote in message
news:pan.2009.11.26.01.48.45.374830(a)e86.GTS...
> On Wed, 25 Nov 2009 15:37:44 -0800, Jeff Strickland wrote:
>
>>
>> "muzician21" <muzician21(a)yahoo.com> wrote in message
>> news:fe305f70-bdc0-47e5-9f45-c483b2df943f(a)w19g2000yqk.googlegroups.com...
>>> 89 Cressida w/7MGE - I just started seeing my oil pressure light going
>>> on today at low rpm - basically below about 800 rpm, particularly when
>>> in gear. Assuming the sensor is correct, is there any reason for this
>>> besides the oil pump? The engine only has about 40k miles since a
>>> rebuild, re-used the old oil pump which I assume is the original. Car
>>> has about 150k miles on it.
>>>
>>> What's the life expectancy of these pumps?
>>>
>>> Besides Ebay any good source for parts? Dealer wants most of $300 for
>>> one, the auto parts places apparently don't have it.
>>>
>>> Thanks for all input.
>>
>>
>> Worn out bearings and seals cal let the oil pressure drop.
>>
>> The rule of thumb is that you need 10psi of pressure for every 1000 rpm.
>
> Spec:
>
> http://www.cygnusx1.net/Supra/Library/TSRM/MK3/manual.aspx?Section=LU&P=4
>
> 6. Measure Oil Pressure
>
> Oil pressure:
> At idle speed: 0.3 kg/cm3 (4.3 psi)
> At 3,000 RPM: 2.5 - 5.0 kg/cm#
> (36 - 71 psi)
>
> This engine has kind of a low spec. My Supra has an oil pressure gauge,
> and if it's accurate at all, my car falls in spec. I think it's low, but
> it's in spec.
>
> NOTE: after hard driving with the engine fully warm, oil pressure will
> drop a bit. Use a heavier weight oil like 10-40 or 'diesel' oil, 15-40.
>
>
>


If all you want is high pressure, use 20w50. I used 20w50 in my Jeep for
summer in Southern California, but I'm positive that if 20w50 works for
anybody anywhere else in the world, engine troubles are close at hand. I
found the 20w50 in my 258 Inline 6 was slow to get to the top of the motor.
I used it exactly one oil change. The upside is, the leaks stopped while I
used it.

The spec you give is a little under 10psi per 1000rpm at idle and a bit over
at highway speeds. Since the question is about idle speed pressure dropping,
if he's got 10psi at idle, then all is well in his universe.









From: Jeff Strickland on 25 Nov 2009 20:59
I resemble that remark ... ;-)


> It always seems to be top-posters doesn't it?
>
>
>
>> Didn't I say that?
>>
>>
>>> As well as worn main bearings
>>>

"fred" <fred(a)bedrock.rock> wrote in message
news:Xns9CCED460588C7fred(a)127.0.0.1...
> "Jeff Strickland" <crwlrjeff(a)yahoo.com> wrote in
> news:hekg2i$q4b$1(a)news.eternal-september.org:
>>
>> "Mike Hunter" <Mikehunt2(a)lycos,com> wrote in message
>> news:4b0dc35b$0$19746$ce5e7886(a)news-radius.ptd.net...
>>>
>>> "Jeff Strickland" <crwlrjeff(a)yahoo.com> wrote in message
>>> news:hekf4a$j8c$1(a)news.eternal-september.org...
>>>>
>>>> "muzician21" <muzician21(a)yahoo.com> wrote in message
>>>> news:fe305f70-bdc0-47e5-9f45-c483b2df943f(a)w19g2000yqk.googlegroups.com.
>>>> ..
>>>>> 89 Cressida w/7MGE - I just started seeing my oil pressure light
>>>>> going on today at low rpm - basically below about 800 rpm,
>>>>> particularly when in gear. Assuming the sensor is correct, is there
>>>>> any reason for this besides the oil pump? The engine only has about
>>>>> 40k miles since a rebuild, re-used the old oil pump which I assume is
>>>>> the original. Car has about 150k miles on it.
>>>>>
>>>>> What's the life expectancy of these pumps?
>>>>>
>>>>> Besides Ebay any good source for parts? Dealer wants most of $300 for
>>>>> one, the auto parts places apparently don't have it.
>>>>>
>>>>> Thanks for all input.
>>>>
>>>>
>>>> Worn out bearings and seals cal let the oil pressure drop.
>>>>
>>>> The rule of thumb is that you need 10psi of pressure for every 1000
>>>> rpm.


From: muzician21 on 25 Nov 2009 21:49
On Nov 25, 8:13 pm, Tegger <inva...(a)invalid.inv> wrote:

> The oil filter should present a restriction to oil flow that is LESS than
> the restriction created by bottom-end bearing clearances, even at maximum
> engine speed or at extreme low temperatures.


I first noticed it today at a stoplight and it was still doing it
after it had been sitting all day and fired up and idling in the
parking lot.

Since making my original post, after a filter change and refill with
5W-40 Mobil 1, and about 30 - 45 mins of around town go-to-store, fire
it up again go to another store driving, for the moment I haven't seen
the light come back on again - might have been a mucked up filter.
Will take a longer down the highway run later and then see what
happens.

I appreciate everyone's input.
From: Jeff Strickland on 25 Nov 2009 22:46

"muzician21" <muzician21(a)yahoo.com> wrote in message
news:ef7f18f9-11d8-4d67-a670-370f1fd3b38a(a)f16g2000yqm.googlegroups.com...
On Nov 25, 8:13 pm, Tegger <inva...(a)invalid.inv> wrote:

> The oil filter should present a restriction to oil flow that is LESS than
> the restriction created by bottom-end bearing clearances, even at maximum
> engine speed or at extreme low temperatures.


I first noticed it today at a stoplight and it was still doing it
after it had been sitting all day and fired up and idling in the
parking lot.

Since making my original post, after a filter change and refill with
5W-40 Mobil 1, and about 30 - 45 mins of around town go-to-store, fire
it up again go to another store driving, for the moment I haven't seen
the light come back on again - might have been a mucked up filter.
Will take a longer down the highway run later and then see what
happens.

I appreciate everyone's input.


<JS>
My input is that you have selected oil that's pretty light, and this will
give you low oil pressure.


</JS>



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