No oil pressure (new oil pump already) - Jeep Wrangler Forum
Jeep Wrangler Forum

Go Back   Jeep Wrangler Forum > TJ Jeep Wrangler Forum > TJ Tech Forum

Join Wrangler Forum Today


Reply
 
Thread Tools

Please support our sponsors and let them know you heard about them on WranglerForum.com
Old 06-04-2009, 08:54 PM   #1
Newb
 
Join Date: Jun 2009
Posts: 8
No oil pressure (new oil pump already)

ok i replaced the old oil pump, oil filter, and the oil. I also took the oil pan off and clean all the internal parts and the rockers as well as the pins. after putting everything together, it cranks easily (just like new). but still no oil pressure. You can hear ticking but not really any knocking HELPPPPPP PLEASEEE!!!

newagecustoms is offline   Quote Quick Reply
Old 06-04-2009, 09:04 PM   #2
Jeeper
 
Join Date: Nov 2007
Location: south jersey
Posts: 501
new pressure gauge? the sending units like to fail. i put a mechanical oil pressure gauge in mine so that i always know my actual oil pressure.

350chevrolet is offline   Quote Quick Reply
Old 06-04-2009, 09:21 PM   #3
Newb
 
Join Date: Jun 2009
Posts: 8
would that cause ticking under the value cover. The oil pump good and how hard was it to install mechanical guage?
newagecustoms is offline   Quote Quick Reply
Old 06-04-2009, 09:21 PM   #4
Knows a couple things...

WF Supporting Member
 
Jerry Bransford's Avatar
 
Join Date: Nov 2005
Location: Escondido, Calif.
Posts: 29,291
Images: 2
As suggested where you posted this up on JF, have you replaced the oil pressur sender? That's the most common cause of a low/zero oil pressure reading on your gauge.
__________________
When you have a choice, buy American.

Jerry Bransford is online now   Quote Quick Reply
Old 06-05-2009, 12:26 AM   #5
Jeeper
 
PastorSteve's Avatar
 
Join Date: Jul 2008
Location: Denver
Posts: 66
Check your sending unit and wire to make sure it is connected.
__________________
2008 JK Sahara Jeep Green.
Land of Mountain Trails
PastorSteve is offline   Quote Quick Reply
Old 06-05-2009, 01:59 PM   #6
Jack Lives Here!!!

WF Supporting Member
 
1BLKJP's Avatar
 
Join Date: Apr 2005
Location: Phoenix, AZ
Posts: 7,764
Well if you are getting lifter ticking then you might honestly not be getting any oil pressure. However as the others have said I would also replace the sending unit first on the passenger side of the block.
1BLKJP is offline   Quote Quick Reply
Old 06-06-2009, 02:29 PM   #7
Newb
 
Join Date: Jun 2009
Posts: 8
ok i replaced the sending unit. And Now the oil pressure jumps from 0 to 20 when i give it alittle gas but at idle, it returns to zero. So i took the value cover off. Then started the engine, all rockers where moving but some would shoot oil and others wouldn`t. i`m not sure what to do now.
newagecustoms is offline   Quote Quick Reply
Old 06-06-2009, 05:42 PM   #8
Newb
 
Join Date: Jun 2009
Posts: 8
OK, This is whats happing as of now i still have a tickin nosie under the value cover plus now the I'm hearing knocking sound. Buddy of mind told me crankshaft bearings are out. Does any one know how to replace these or around how much it cost to do so?
newagecustoms is offline   Quote Quick Reply
Old 06-06-2009, 09:05 PM   #9
Jeeper
 
Join Date: Nov 2007
Location: south jersey
Posts: 501
no point in replacing the main bearings. everything else is half dead now because of not having oil. it would be easier and probably cheaper to just replace the motor. to replace the bearings you basically have to remove the head, remove the rods and pistons, then remove the crank. since your getting a knock, you have a spun bearing and the block needs to be cut and probably the crank/rods and bigger bearings fitted. you would also probably need new cam bearings and a cam and rockers and ....... yeah just replace the motor and save yourself the headache of trying to rebuild your current one. think of it this way, perfect time to shove a v8 in it lol.
350chevrolet is offline   Quote Quick Reply
Old 06-06-2009, 11:20 PM   #10
Jeeper
 
yjwes's Avatar
 
Join Date: May 2009
Location: howell nj
Posts: 369
Quote:
Originally Posted by newagecustoms View Post
OK, This is whats happing as of now i still have a tickin nosie under the value cover plus now the I'm hearing knocking sound. Buddy of mind told me crankshaft bearings are out. Does any one know how to replace these or around how much it cost to do so?
you might get away with a lower end overhaul however if your not a experienced mechanic u may want to look into a engine
yjwes is offline   Quote Quick Reply
Old 06-07-2009, 12:29 AM   #11
Jack Lives Here!!!

WF Supporting Member
 
1BLKJP's Avatar
 
Join Date: Apr 2005
Location: Phoenix, AZ
Posts: 7,764
Quote:
Originally Posted by 350chevrolet View Post
no point in replacing the main bearings. everything else is half dead now because of not having oil. it would be easier and probably cheaper to just replace the motor. to replace the bearings you basically have to remove the head, remove the rods and pistons, then remove the crank. since your getting a knock, you have a spun bearing and the block needs to be cut and probably the crank/rods and bigger bearings fitted. you would also probably need new cam bearings and a cam and rockers and ....... yeah just replace the motor and save yourself the headache of trying to rebuild your current one. think of it this way, perfect time to shove a v8 in it lol.
If it spun a bearing do you think it would even move anymore?

Also why not suggest dropping the pan and seeing what can be seen. The main bearings etc.... can be taken out from underneath without pulling the motor.
__________________
Thanks,
Jack Hickman

President - Arizona Off-Highway Vehicle Coalition
Vice-President - ASA4WDC
Arizona Rock Rats
1BLKJP is offline   Quote Quick Reply
Old 06-07-2009, 12:59 AM   #12
Jeeper
 
yjwes's Avatar
 
Join Date: May 2009
Location: howell nj
Posts: 369
you might have smeared a main bearing i would drop the pan and drop all the main cap not all at the same time and drop all the rod caps and see what the bearings look like
yjwes is offline   Quote Quick Reply
Old 06-07-2009, 02:42 PM   #13
Jeeper
 
06jeep's Avatar
 
Join Date: Apr 2009
Posts: 56
If you drop the pan you can try to move each main bearing cap back and forth by hand to find the one thats bad, if the crank isn't scared you might be able to put an oversize bearing in. Did this to my buddys jeep and has been fine. But if your crank is scared then you want to start looking for a new engine.
06jeep is offline   Quote Quick Reply
Old 06-07-2009, 02:56 PM   #14
Knows a couple things...

WF Supporting Member
 
Jerry Bransford's Avatar
 
Join Date: Nov 2005
Location: Escondido, Calif.
Posts: 29,291
Images: 2
His crankshaft might be scared? What does a crankshaft have to fear?
__________________
When you have a choice, buy American.

Jerry Bransford is online now   Quote Quick Reply
Old 06-07-2009, 04:24 PM   #15
Newb
 
Join Date: Jun 2009
Posts: 8
How would you know if the crank is scared? .... I took the oil pan off today and one at a time i took the rod bearings out and check them out they look fine i assume i mean there wasnt any chips missing or any damge done. After putting them back together. I started on the main bearings and they were the same. I must be not doing something right. As far as the cam shaft i`m thinking i can take the front bumper and radiator off and that would make it easier to remove the cam shaft instead of removing the motor. Any one tried this or any other ideas?
newagecustoms is offline   Quote Quick Reply
Old 06-07-2009, 04:30 PM   #16
Newb
 
Join Date: Jun 2009
Posts: 8
Would i Have to replace the cam bearings? I mean would that cause low oil pressure or knocking?
newagecustoms is offline   Quote Quick Reply
Old 06-07-2009, 04:41 PM   #17
Jeeper
 
yjwes's Avatar
 
Join Date: May 2009
Location: howell nj
Posts: 369
Quote:
Originally Posted by newagecustoms View Post
Would i Have to replace the cam bearings? I mean would that cause low oil pressure or knocking?
unlikely the next step would be to check the main and rod bearing clearance with plastigage
yjwes is offline   Quote Quick Reply
Old 06-07-2009, 05:45 PM   #18
Jeeper
 
Join Date: Aug 2008
Posts: 2,473
Wow - "a buddy says" - without any type of diagnosis.
And posters assume the crank is shot - without any basis.

Are these dealer "mechanics?" Sure sounds like it.

You replaced the sending unit - good, but how do you know it's a good one? I'd install a mechanical gauge - even if not permanent, just to verify it's not an electronic sender/gauge/wiring/PCM fault. They are cheap - especially compared to a new motor.

The oil - what is it - how thick or thin, and how long has it been in there? Are you a recent new owner? Filter, how long, what kind? Sludge?

When you took the bottom end loose - how was the oil pump screen? Plugged, full of butterflies?

Some folks get a kick out of suggesting a new motor, yet when they have a problem they don't throw big costly parts at it! They like spending YOUR money.

What would you do if you went to a doctor with a runny nose, and without any tests, and he said you needed a heart transplant?

No wonder the crankshaft is scared!

__________________
It's no wonder the country is falling apart - stupidity abounds!
rrich is offline   Quote Quick Reply
Reply

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Jeep Wrangler Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
If you do not want to register, fill this field only and the name will be used as user name for your post.
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Thread Tools

Posting Rules
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
92 YJ 2.5 Won't start, no power to the fuel pump eyeChrs YJ Tech Forum 15 02-14-2012 04:46 PM
Oil Pressure drop, DD need help quick! Under the Palms TJ Tech Forum 12 10-04-2010 03:56 PM
Low oil pressure at idle 97tjcse TJ Tech Forum 9 08-24-2009 10:12 PM
Fuel Pressure Problem? Rigerator YJ Tech Forum 7 05-18-2009 09:02 AM
intermittant power to fuel pump skeeter General Jeep Discussion 4 02-08-2009 08:22 PM



» Network Links
»Jeep Parts
» Featured Product

All times are GMT -5. The time now is 11:09 AM.



Jeep®, Wrangler, Liberty, Wagoneer, Cherokee, and Grand Cherokee are copyrighted and trademarked to Chrysler Motors LLC.
Wranglerforum.com is not in any way associated with the Chrysler Motors LLC