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YJ-Type-R
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Post subject: Low Oil Pressure  Posted: Wed Mar 21, 2007 6:39 pm |
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| Jeeper in IN |
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Joined: Wed Feb 04, 2004 5:31 pm
Posts: 661
Location: Tipton, Indiana
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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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Get Bent
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Post subject: Posted: Wed Mar 21, 2007 7:03 pm |
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| mister wiskers |
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Joined: Thu Jun 03, 2004 4:15 am
Posts: 1631
Location: For Twain, In Dianna
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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.
_________________ Hung like Einstein, smart as a horse. Semper Fidelis. 
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macgyvr
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Post subject: Posted: Thu Mar 22, 2007 3:57 am |
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| Tang Soo |
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Joined: Tue Jun 15, 2004 2:34 am
Posts: 2727
Location: NE Indiana
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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
_________________
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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Chuck
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Post subject: Posted: Thu Mar 22, 2007 8:37 am |
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| Feeds people vomit |
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Joined: Mon Sep 13, 2004 6:10 pm
Posts: 6282
Location: West Lafayette, IN
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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
_________________
'78 CJ7 project....350, NV3500, NP241, fiberglass tub, show and shine
'72 Oldsmobile Cutlass convertible - the family fun car
'05 Chevrolet 3500 dually, duramax, stock
'05 Honda Odessey awesomevan
'08 Chevrolet HHR company car - The silver bullet
Whatever....
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kennedy
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Post subject: Posted: Thu Mar 22, 2007 9:58 am |
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| Thread Necromancer |
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Joined: Thu Sep 11, 2003 7:25 pm
Posts: 29262
Location: Omokok, NI
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Or do what I did... run 50 weight and trade it off!
_________________ 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  ....................................................   "Concern yourself with what is right and you'll never second-guess that decision" I'm not really an  , I just play one on the internet!
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Watchamaklit
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Post subject: 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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Joined: Wed Aug 06, 2003 5:39 pm
Posts: 108714
Location: about 3miles east of Luther, IN
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If it ain't knockin don't worry about it. 
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I got a dirty mind, a gutter mouth, I'm makin time, I'm going out with your wife.
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crazy_cooter56
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Post subject: Posted: Thu Mar 22, 2007 11:33 am |
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| greasy gizzard-juice |
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Joined: Thu Aug 07, 2003 1:31 am
Posts: 5231
Location: claypool
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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. _________________ Check out my woman's webpage so she'll be happy lol. If ya need photography work done this is the place to get it.
http://iwant2shootu.com
Hell who knows what I'm gonna have from one day to the next so why bother trying to list em.
[/img]http://i41.photobucket.com/albums/e252/crazy_cooter56/jeeps2.jpg[/img]
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macgyvr
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Post subject: Posted: Thu Mar 22, 2007 11:37 pm |
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| Tang Soo |
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Joined: Tue Jun 15, 2004 2:34 am
Posts: 2727
Location: NE Indiana
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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
_________________
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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kennedy
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Post subject: Posted: Fri Mar 23, 2007 12:02 am |
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| Thread Necromancer |
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Joined: Thu Sep 11, 2003 7:25 pm
Posts: 29262
Location: Omokok, NI
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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... _________________ 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 .................................................... "Concern yourself with what is right and you'll never second-guess that decision" I'm not really an , I just play one on the internet!
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Scout-Matt
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Post subject: Posted: Fri Mar 23, 2007 8:59 am |
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| trained to drive the choo choo |
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Joined: Mon Jun 20, 2005 10:21 pm
Posts: 2765
Location: In the laboratory
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I had that once, turned out to be cam bearings.
_________________
Brawndo! It's got electrolytes!
My mind is like a steel trap, everything that goes in comes out mutilated.
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YJ-Type-R
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Post subject: Posted: Fri Mar 23, 2007 2:13 pm |
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| Jeeper in IN |
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Joined: Wed Feb 04, 2004 5:31 pm
Posts: 661
Location: Tipton, Indiana
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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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macgyvr
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Post subject: Posted: Fri Mar 23, 2007 4:22 pm |
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| Tang Soo |
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Joined: Tue Jun 15, 2004 2:34 am
Posts: 2727
Location: NE Indiana
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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
_________________
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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crazy_cooter56
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Post subject: Posted: Sat Mar 24, 2007 4:04 pm |
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| greasy gizzard-juice |
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Joined: Thu Aug 07, 2003 1:31 am
Posts: 5231
Location: claypool
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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.
_________________ Check out my woman's webpage so she'll be happy lol. If ya need photography work done this is the place to get it.
http://iwant2shootu.com
Hell who knows what I'm gonna have from one day to the next so why bother trying to list em.
[/img]http://i41.photobucket.com/albums/e252/crazy_cooter56/jeeps2.jpg[/img]
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