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From: Tegger on 25 Nov 2009 20:13
Steve Austin <saustin(a)northnet.org> wrote in news:4b0dc36d$0$27440$38cefb40
@news.westelcom.com:

> 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)




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.

The bearings get their pressure from the oil pump. If the filter is a
restriction, the bearings will be starved for oil and the reported pressure
will be low.

I won't use FRAM, but inadequate oil pressure is not the reason why.


--
Tegger

From: Hachiroku ハチロク on 25 Nov 2009 20:44
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!)



From: Hachiroku ハチロク on 25 Nov 2009 20:48
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.



From: Hachiroku ハチロク on 25 Nov 2009 20:49
On Wed, 25 Nov 2009 14:55:07 -0800, 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.

What did you do for a rebuild?

Also, why rebuild an engine and not replace the oil pump?!?!?

That engine is a real PITA to get to the oil pump! Should have done it
when you had the engine out!



From: fred on 25 Nov 2009 20:50
"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.

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




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