Low Oil Pressure Guesses
05-01-2007, 08:05 PM
#51
Guest
Posts: n/a
Re: Low Oil Pressure Guesses
> Problem: It has low oil pressure after warm up.
>
> Cold (ambient, 65deg.) pressure is 45psi. After warm up, it cruises around
> 25-30psi then it idles down to "0", and all the check gauges lights all come
> on. Pressure confirmed within a psi or two with a "live" gauge.
> Tapping the throttle obviously raises the pressure slightly, and lights go
> off. Running the A/C helps increase the idle slightly, increasing pressure
> slightly.
Does it ever return to normal? The early TJs have always had an
instrument panel problem that sometimes gives erratic oil pressure
readings. Sometimes mine goes down to nearly zero but eventually it
returns to normal.
>
> Cold (ambient, 65deg.) pressure is 45psi. After warm up, it cruises around
> 25-30psi then it idles down to "0", and all the check gauges lights all come
> on. Pressure confirmed within a psi or two with a "live" gauge.
> Tapping the throttle obviously raises the pressure slightly, and lights go
> off. Running the A/C helps increase the idle slightly, increasing pressure
> slightly.
Does it ever return to normal? The early TJs have always had an
instrument panel problem that sometimes gives erratic oil pressure
readings. Sometimes mine goes down to nearly zero but eventually it
returns to normal.
05-01-2007, 08:05 PM
#52
Guest
Posts: n/a
Re: Low Oil Pressure Guesses
> Problem: It has low oil pressure after warm up.
>
> Cold (ambient, 65deg.) pressure is 45psi. After warm up, it cruises around
> 25-30psi then it idles down to "0", and all the check gauges lights all come
> on. Pressure confirmed within a psi or two with a "live" gauge.
> Tapping the throttle obviously raises the pressure slightly, and lights go
> off. Running the A/C helps increase the idle slightly, increasing pressure
> slightly.
Does it ever return to normal? The early TJs have always had an
instrument panel problem that sometimes gives erratic oil pressure
readings. Sometimes mine goes down to nearly zero but eventually it
returns to normal.
>
> Cold (ambient, 65deg.) pressure is 45psi. After warm up, it cruises around
> 25-30psi then it idles down to "0", and all the check gauges lights all come
> on. Pressure confirmed within a psi or two with a "live" gauge.
> Tapping the throttle obviously raises the pressure slightly, and lights go
> off. Running the A/C helps increase the idle slightly, increasing pressure
> slightly.
Does it ever return to normal? The early TJs have always had an
instrument panel problem that sometimes gives erratic oil pressure
readings. Sometimes mine goes down to nearly zero but eventually it
returns to normal.
05-01-2007, 08:05 PM
#53
Guest
Posts: n/a
Re: Low Oil Pressure Guesses
> Problem: It has low oil pressure after warm up.
>
> Cold (ambient, 65deg.) pressure is 45psi. After warm up, it cruises around
> 25-30psi then it idles down to "0", and all the check gauges lights all come
> on. Pressure confirmed within a psi or two with a "live" gauge.
> Tapping the throttle obviously raises the pressure slightly, and lights go
> off. Running the A/C helps increase the idle slightly, increasing pressure
> slightly.
Does it ever return to normal? The early TJs have always had an
instrument panel problem that sometimes gives erratic oil pressure
readings. Sometimes mine goes down to nearly zero but eventually it
returns to normal.
>
> Cold (ambient, 65deg.) pressure is 45psi. After warm up, it cruises around
> 25-30psi then it idles down to "0", and all the check gauges lights all come
> on. Pressure confirmed within a psi or two with a "live" gauge.
> Tapping the throttle obviously raises the pressure slightly, and lights go
> off. Running the A/C helps increase the idle slightly, increasing pressure
> slightly.
Does it ever return to normal? The early TJs have always had an
instrument panel problem that sometimes gives erratic oil pressure
readings. Sometimes mine goes down to nearly zero but eventually it
returns to normal.
05-01-2007, 10:45 PM
#54
Guest
Posts: n/a
Re: Re: Low Oil Pressure Guesses
On Tue, 1 May 2007 17:37:39 -0600, "Earle Horton"
<earle@vascongado.usa> wrote:
>I think that the bearings are "select fit" on this model. You can't just
>order stock or 0.001" under and call it good. You have to plastigage every
>one and select fit the right size to each journal. The journals are
>probably scratched too. What did you do to it, so I don't make the same
>mistake? Good enough?
If it is select to fit it is because of production tolerances because
it uses basically same bearings as old six it was based off of. I once
tore into the crankcase of a 78 cherokee with a 258 that had oil
pressure problems but it was not knocking, I found that the bearing
that control end play was installed in wrong place and crank was
flopping back and forth a bit. I do not knoe if it was original or
someone had monkeyed with it but it had been that way for quite a
while for sure.
-----------------
TheSnoMan.com
<earle@vascongado.usa> wrote:
>I think that the bearings are "select fit" on this model. You can't just
>order stock or 0.001" under and call it good. You have to plastigage every
>one and select fit the right size to each journal. The journals are
>probably scratched too. What did you do to it, so I don't make the same
>mistake? Good enough?
If it is select to fit it is because of production tolerances because
it uses basically same bearings as old six it was based off of. I once
tore into the crankcase of a 78 cherokee with a 258 that had oil
pressure problems but it was not knocking, I found that the bearing
that control end play was installed in wrong place and crank was
flopping back and forth a bit. I do not knoe if it was original or
someone had monkeyed with it but it had been that way for quite a
while for sure.
-----------------
TheSnoMan.com
05-01-2007, 10:45 PM
#55
Guest
Posts: n/a
Re: Re: Low Oil Pressure Guesses
On Tue, 1 May 2007 17:37:39 -0600, "Earle Horton"
<earle@vascongado.usa> wrote:
>I think that the bearings are "select fit" on this model. You can't just
>order stock or 0.001" under and call it good. You have to plastigage every
>one and select fit the right size to each journal. The journals are
>probably scratched too. What did you do to it, so I don't make the same
>mistake? Good enough?
If it is select to fit it is because of production tolerances because
it uses basically same bearings as old six it was based off of. I once
tore into the crankcase of a 78 cherokee with a 258 that had oil
pressure problems but it was not knocking, I found that the bearing
that control end play was installed in wrong place and crank was
flopping back and forth a bit. I do not knoe if it was original or
someone had monkeyed with it but it had been that way for quite a
while for sure.
-----------------
TheSnoMan.com
<earle@vascongado.usa> wrote:
>I think that the bearings are "select fit" on this model. You can't just
>order stock or 0.001" under and call it good. You have to plastigage every
>one and select fit the right size to each journal. The journals are
>probably scratched too. What did you do to it, so I don't make the same
>mistake? Good enough?
If it is select to fit it is because of production tolerances because
it uses basically same bearings as old six it was based off of. I once
tore into the crankcase of a 78 cherokee with a 258 that had oil
pressure problems but it was not knocking, I found that the bearing
that control end play was installed in wrong place and crank was
flopping back and forth a bit. I do not knoe if it was original or
someone had monkeyed with it but it had been that way for quite a
while for sure.
-----------------
TheSnoMan.com
05-01-2007, 10:45 PM
#56
Guest
Posts: n/a
Re: Re: Low Oil Pressure Guesses
On Tue, 1 May 2007 17:37:39 -0600, "Earle Horton"
<earle@vascongado.usa> wrote:
>I think that the bearings are "select fit" on this model. You can't just
>order stock or 0.001" under and call it good. You have to plastigage every
>one and select fit the right size to each journal. The journals are
>probably scratched too. What did you do to it, so I don't make the same
>mistake? Good enough?
If it is select to fit it is because of production tolerances because
it uses basically same bearings as old six it was based off of. I once
tore into the crankcase of a 78 cherokee with a 258 that had oil
pressure problems but it was not knocking, I found that the bearing
that control end play was installed in wrong place and crank was
flopping back and forth a bit. I do not knoe if it was original or
someone had monkeyed with it but it had been that way for quite a
while for sure.
-----------------
TheSnoMan.com
<earle@vascongado.usa> wrote:
>I think that the bearings are "select fit" on this model. You can't just
>order stock or 0.001" under and call it good. You have to plastigage every
>one and select fit the right size to each journal. The journals are
>probably scratched too. What did you do to it, so I don't make the same
>mistake? Good enough?
If it is select to fit it is because of production tolerances because
it uses basically same bearings as old six it was based off of. I once
tore into the crankcase of a 78 cherokee with a 258 that had oil
pressure problems but it was not knocking, I found that the bearing
that control end play was installed in wrong place and crank was
flopping back and forth a bit. I do not knoe if it was original or
someone had monkeyed with it but it had been that way for quite a
while for sure.
-----------------
TheSnoMan.com
05-01-2007, 10:45 PM
#57
Guest
Posts: n/a
Re: Re: Low Oil Pressure Guesses
On Tue, 1 May 2007 17:37:39 -0600, "Earle Horton"
<earle@vascongado.usa> wrote:
>I think that the bearings are "select fit" on this model. You can't just
>order stock or 0.001" under and call it good. You have to plastigage every
>one and select fit the right size to each journal. The journals are
>probably scratched too. What did you do to it, so I don't make the same
>mistake? Good enough?
If it is select to fit it is because of production tolerances because
it uses basically same bearings as old six it was based off of. I once
tore into the crankcase of a 78 cherokee with a 258 that had oil
pressure problems but it was not knocking, I found that the bearing
that control end play was installed in wrong place and crank was
flopping back and forth a bit. I do not knoe if it was original or
someone had monkeyed with it but it had been that way for quite a
while for sure.
-----------------
TheSnoMan.com
<earle@vascongado.usa> wrote:
>I think that the bearings are "select fit" on this model. You can't just
>order stock or 0.001" under and call it good. You have to plastigage every
>one and select fit the right size to each journal. The journals are
>probably scratched too. What did you do to it, so I don't make the same
>mistake? Good enough?
If it is select to fit it is because of production tolerances because
it uses basically same bearings as old six it was based off of. I once
tore into the crankcase of a 78 cherokee with a 258 that had oil
pressure problems but it was not knocking, I found that the bearing
that control end play was installed in wrong place and crank was
flopping back and forth a bit. I do not knoe if it was original or
someone had monkeyed with it but it had been that way for quite a
while for sure.
-----------------
TheSnoMan.com
05-01-2007, 10:53 PM
#58
Guest
Posts: n/a
Re: Low Oil Pressure Guesses
"Earle Horton" <earle@vascongado.usa> wrote in message
news:4637cf48$0$31846$a82e2bb9@reader.athenanews.c om...
> "Spdloader" <askforit@nospam.triad.rr.com> wrote in message
> news:4637ad69$0$4692$4c368faf@roadrunner.com...
>>
>> "Earle Horton" <earle@vascongado.usa> wrote in message
>> news:46379b1c$0$31797$a82e2bb9@reader.athenanews.c om...
>> > "Spdloader" <askforit@nospam.triad.rr.com> wrote in message
>> > news:46378d8c$0$15097$4c368faf@roadrunner.com...
>> >>
>> >> You did not mention
>> >> > if you bought it new or the mileage on it.
>> >>
>> >>
>> >> Um, I did buy it new, and I did mention that the mileage
>> >> was 77,000.
>> >>
>> > Mine's got 90,000+ miles, and it still gets the same oil pressure
>> > as it did when new. The symptoms point to bearings.
>> >
>> > Cheers,
>> >
>> > Earle
>> >
>> >
>> I'm in denial right now Earle, humor me a bit.
>>
> I think that the bearings are "select fit" on this model. You can't just
> order stock or 0.001" under and call it good. You have to plastigage
> every
> one and select fit the right size to each journal. The journals are
> probably scratched too. What did you do to it, so I don't make the same
> mistake? Good enough?
>
> Cheers,
>
> Earle
Don't know for sure what happened. My wife drives it to work everyday, 7-8
miles one way. (to save the miles on her Eddie Bauer Explorer)
She told me a couple of months ago she was seeing the "check gauges" light
up, at idle sometimes, but I couldn't get it to do it when I'd go down and
drive it. (The weather was still cold too)
I did notice it was very, very low on anti-freeze when I serviced it for the
spring, so it may have been running hot, I really don't think she'd know if
it did.
At any rate, since the warm weather is here to stay the "check gauges" thing
has become consistent. One other thing, it rattles upon start up, lower end
rattles, for about 2-3 seconds.
Besides the other things I've done to it, I'm also running straight 40wt
oil.
Spdloader
05-01-2007, 10:53 PM
#59
Guest
Posts: n/a
Re: Low Oil Pressure Guesses
"Earle Horton" <earle@vascongado.usa> wrote in message
news:4637cf48$0$31846$a82e2bb9@reader.athenanews.c om...
> "Spdloader" <askforit@nospam.triad.rr.com> wrote in message
> news:4637ad69$0$4692$4c368faf@roadrunner.com...
>>
>> "Earle Horton" <earle@vascongado.usa> wrote in message
>> news:46379b1c$0$31797$a82e2bb9@reader.athenanews.c om...
>> > "Spdloader" <askforit@nospam.triad.rr.com> wrote in message
>> > news:46378d8c$0$15097$4c368faf@roadrunner.com...
>> >>
>> >> You did not mention
>> >> > if you bought it new or the mileage on it.
>> >>
>> >>
>> >> Um, I did buy it new, and I did mention that the mileage
>> >> was 77,000.
>> >>
>> > Mine's got 90,000+ miles, and it still gets the same oil pressure
>> > as it did when new. The symptoms point to bearings.
>> >
>> > Cheers,
>> >
>> > Earle
>> >
>> >
>> I'm in denial right now Earle, humor me a bit.
>>
> I think that the bearings are "select fit" on this model. You can't just
> order stock or 0.001" under and call it good. You have to plastigage
> every
> one and select fit the right size to each journal. The journals are
> probably scratched too. What did you do to it, so I don't make the same
> mistake? Good enough?
>
> Cheers,
>
> Earle
Don't know for sure what happened. My wife drives it to work everyday, 7-8
miles one way. (to save the miles on her Eddie Bauer Explorer)
She told me a couple of months ago she was seeing the "check gauges" light
up, at idle sometimes, but I couldn't get it to do it when I'd go down and
drive it. (The weather was still cold too)
I did notice it was very, very low on anti-freeze when I serviced it for the
spring, so it may have been running hot, I really don't think she'd know if
it did.
At any rate, since the warm weather is here to stay the "check gauges" thing
has become consistent. One other thing, it rattles upon start up, lower end
rattles, for about 2-3 seconds.
Besides the other things I've done to it, I'm also running straight 40wt
oil.
Spdloader
05-01-2007, 10:53 PM
#60
Guest
Posts: n/a
Re: Low Oil Pressure Guesses
"Earle Horton" <earle@vascongado.usa> wrote in message
news:4637cf48$0$31846$a82e2bb9@reader.athenanews.c om...
> "Spdloader" <askforit@nospam.triad.rr.com> wrote in message
> news:4637ad69$0$4692$4c368faf@roadrunner.com...
>>
>> "Earle Horton" <earle@vascongado.usa> wrote in message
>> news:46379b1c$0$31797$a82e2bb9@reader.athenanews.c om...
>> > "Spdloader" <askforit@nospam.triad.rr.com> wrote in message
>> > news:46378d8c$0$15097$4c368faf@roadrunner.com...
>> >>
>> >> You did not mention
>> >> > if you bought it new or the mileage on it.
>> >>
>> >>
>> >> Um, I did buy it new, and I did mention that the mileage
>> >> was 77,000.
>> >>
>> > Mine's got 90,000+ miles, and it still gets the same oil pressure
>> > as it did when new. The symptoms point to bearings.
>> >
>> > Cheers,
>> >
>> > Earle
>> >
>> >
>> I'm in denial right now Earle, humor me a bit.
>>
> I think that the bearings are "select fit" on this model. You can't just
> order stock or 0.001" under and call it good. You have to plastigage
> every
> one and select fit the right size to each journal. The journals are
> probably scratched too. What did you do to it, so I don't make the same
> mistake? Good enough?
>
> Cheers,
>
> Earle
Don't know for sure what happened. My wife drives it to work everyday, 7-8
miles one way. (to save the miles on her Eddie Bauer Explorer)
She told me a couple of months ago she was seeing the "check gauges" light
up, at idle sometimes, but I couldn't get it to do it when I'd go down and
drive it. (The weather was still cold too)
I did notice it was very, very low on anti-freeze when I serviced it for the
spring, so it may have been running hot, I really don't think she'd know if
it did.
At any rate, since the warm weather is here to stay the "check gauges" thing
has become consistent. One other thing, it rattles upon start up, lower end
rattles, for about 2-3 seconds.
Besides the other things I've done to it, I'm also running straight 40wt
oil.
Spdloader