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 Post subject: Low Oil Pressure
 Post Posted: Wed Mar 21, 2007 6:39 pm 
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Jeeper in IN
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My oil pressure gauge has always read really low and I thought it was just the gauge which has never really worked but my lifters have started to clack around alot. What all can cause a low oil pressure? I bought this engine as a remanufactured long block about 50,000 miles ago and it's just starting to get really bad. The oil pump was replaced with the new motor.

My gauge reads really high at startup (around 60-70 psi), then as I drive it will slowly sink down to near zero as it warms up. Not sure if this is typical of a certain failure. It does leak a little oil out of the back and I'm not positive whether it's the oil pan gasket or the rear main.


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 Post Posted: Wed Mar 21, 2007 7:03 pm 
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mister wiskers
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Sounds like a pump to me. If the problem had ALWAYS been there, I'd think a plug was missing in the crank journals.

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 Post Posted: Thu Mar 22, 2007 3:57 am 
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Tang Soo
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pull the pan...

check the main bearings with plastiguage...

if they check out then replace the pump...

otherwise almost sounds like main bearings to me...

mac 'i'd replace the bearings and the pump if it was mine' gyvr

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 Post subject:
 Post Posted: Thu Mar 22, 2007 8:37 am 
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macgyvr wrote:
pull the pan...

check the main bearings with plastiguage...

if they check out then replace the pump...

otherwise almost sounds like main bearings to me...

mac 'i'd replace the bearings and the pump if it was mine' gyvr

ditto

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 Post Posted: Thu Mar 22, 2007 9:58 am 
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Or do what I did... run 50 weight and trade it off!

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noone means any harm and that it's all in fun.. but then there's kennedy..

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 Post Posted: Thu Mar 22, 2007 10:48 am 
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a naked man tit in a highschool locker room
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 Post subject:
 Post Posted: Thu Mar 22, 2007 11:33 am 
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greasy gizzard-juice
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Chuck wrote:
macgyvr wrote:
pull the pan...

check the main bearings with plastiguage...

if they check out then replace the pump...

otherwise almost sounds like main bearings to me...

mac 'i'd replace the bearings and the pump if it was mine' gyvr

ditto


Thanks for writing it for me Mac.

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 Post subject:
 Post Posted: Thu Mar 22, 2007 11:37 pm 
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Tang Soo
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crazy_cooter56 wrote:
Chuck wrote:
macgyvr wrote:
pull the pan...

check the main bearings with plastiguage...

if they check out then replace the pump...

otherwise almost sounds like main bearings to me...

mac 'i'd replace the bearings and the pump if it was mine' gyvr

ditto


Thanks for writing it for me Mac.



welcome...

i learned that bearing going out/nearly gone, will show good pressure when the oil is cooler and thick...then as the oil gets warmer, the pressure goes down...i traded a vehicle in one time with this condition...just had to not let the dealer take it for a very long test drive...

mac '15-45 or 50 wt old will hide the problem somewhat too' gyvr

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My idea of a perfect vacation is a road trip through beautiful country. To make it really fun, all that's needed is a modified vehicle, a few close friends, and some serious off-roading. Cole Quinnell - Editor, 4WOR, Dec 99
My Drinking Team has a Racing Problem


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 Post subject:
 Post Posted: Fri Mar 23, 2007 12:02 am 
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Location: Omokok, NI
macgyvr wrote:
crazy_cooter56 wrote:
Chuck wrote:
macgyvr wrote:
pull the pan...

check the main bearings with plastiguage...

if they check out then replace the pump...

otherwise almost sounds like main bearings to me...

mac 'i'd replace the bearings and the pump if it was mine' gyvr

ditto


Thanks for writing it for me Mac.



welcome...

i learned that bearing going out/nearly gone, will show good pressure when the oil is cooler and thick...then as the oil gets warmer, the pressure goes down...i traded a vehicle in one time with this condition...just had to not let the dealer take it for a very long test drive...

mac '15-45 or 50 wt old will hide the problem somewhat too' gyvr


sounds like my TJ...

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Jeeper4Life wrote:
noone means any harm and that it's all in fun.. but then there's kennedy..

'46CJ2a/buggy project in the works, yeah, still have those parts.
'14 Chebby Silverado, 4x4
'88 GMC S15 Trail Gypsy
A sweet lawn mower
Motorcycles: '14 HD FLHTCU, '92 HD FXRS, '26 HD JD, '02 Suzuki DRZ400, '56 Cushman Eagle, '48 Simplex ServiCycle, '72 Honda MiniTrail50, '81 Yamaha YR250, Probably some other stuff
"Tell me and I'll forget. Show me and I'll remember. Involve me and I'll understand." - Confucius
Image.................................................... ImageImage
"Concern yourself with what is right and you'll never second-guess that decision"
I'm not really an asshole, I just play one on the internet!


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 Post subject:
 Post Posted: Fri Mar 23, 2007 8:59 am 
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trained to drive the choo choo
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I had that once, turned out to be cam bearings.

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 Post subject:
 Post Posted: Fri Mar 23, 2007 2:13 pm 
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Jeeper in IN
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Location: Tipton, Indiana
Thanks for the help guys, I'm going to dig into it tomorrow hopefully. Can a leaky rear main cause low oil pressure? I guess I just don't know where the pressure is developed in the engine.


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 Post subject:
 Post Posted: Fri Mar 23, 2007 4:22 pm 
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Tang Soo
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Location: NE Indiana
YJ-Type-R wrote:
Thanks for the help guys, I'm going to dig into it tomorrow hopefully. Can a leaky rear main cause low oil pressure? I guess I just don't know where the pressure is developed in the engine.


not usually...but it is a jeep...

oil pump and bearings keep the motor running...

mac 'its a jeep' gyvr

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NAXJA president
NAXJA Midwest Chapter president
My idea of a perfect vacation is a road trip through beautiful country. To make it really fun, all that's needed is a modified vehicle, a few close friends, and some serious off-roading. Cole Quinnell - Editor, 4WOR, Dec 99
My Drinking Team has a Racing Problem


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 Post subject:
 Post Posted: Sat Mar 24, 2007 4:04 pm 
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greasy gizzard-juice
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Location: claypool
Older Ford's are notorious for these exact symptoms. Especially the 351 and 400M's. Had a couple of them that would have great pressure upon starting but within a few minutes it was nearly nothing. Both of em spun a bearing and locked up.

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http://iwant2shootu.com

Hell who knows what I'm gonna have from one day to the next so why bother trying to list em.

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