Will Rod bearings do the trick? - Jeep Wrangler Forum
Jeep Wrangler Forum

Go Back   Jeep Wrangler Forum > TJ Jeep Wrangler Forum > TJ General Discussion Forum

Join Wrangler Forum Today


Reply
 
Thread Tools

Please support our sponsors and let them know you heard about them on WranglerForum.com
Old 06-18-2012, 12:35 PM   #1
Newb
 
Join Date: Jun 2012
Posts: 3
Will Rod bearings do the trick?

hello Jeepers,

I have a 2000 jeep wrangler sahara..4.0 liter
I am getting a knock in the engine.. was wondering if it could be piston slap due to a worn rod bearing. it seems to be coming from one of the back pistons. it has lost oil preassure but no smoke..makes me think bearing and not rings

I plan to pull the oil pan in a few moments to see if i can find the one with the wear.

i also plan to do a total rebuild but the timming sucks..as the jeep is my only means of transportation right now..i want a quick fix just to get me by til i can do the complete rebuild

questions i have:
will i be able to visually see the wear..or do i need to use a feeler gauge?
is it possible to remove a piston and rod from the bottom of engine with crank still in? i didnt want to remove the head at this point.

thanks for your input
Adam

amedley is offline   Quote Quick Reply
Old 06-18-2012, 06:08 PM   #2
Newb
 
Join Date: Jun 2012
Posts: 3
Ok Exhaust pipes are a problem to get off...ugh

amedley is offline   Quote Quick Reply
Old 06-18-2012, 06:30 PM   #3
Jeeper
 
div4gold's Avatar
 
Join Date: Feb 2012
Location: WA
Posts: 506
You can't get the piston and rods out the bottom. You could replace the rod bearings but I wouldn't do that without replacing the main bearings and cam bearings. I don't know the exact symptoms but it could also be a wrist pin making the noise. You are going to have to take the head off to get the pistons out. You more than likely won't be able to see any wear. You will have to plastigauge the bearings or mike them.
__________________
2006 TJ Unlimited, stock.
div4gold is offline   Quote Quick Reply
Old 06-18-2012, 07:01 PM   #4
Newb
 
Join Date: Jun 2012
Posts: 3
thanks Div4gold...i understand replacing the mains and cam bearings..i was just wanting to put a band aid on the main problem right now..i also thought it could be a wrist pin.

i dont have another means of transportation right now..was looking for the quick fix
amedley is offline   Quote Quick Reply
Old 06-18-2012, 07:02 PM   #5
Jeeper
 
Atthehop's Avatar
 
Join Date: Jul 2008
Location: NW, NJ
Posts: 3,705
I would pull the engine and tear it down on an engine stand. Much easier than jumping up and down.
__________________
Retired my 94 YJ 4cyl 5spd @ 200K
Now in a 04 TJ 4cyl 5spd CV @120K+
Both as a commuter vehicle in NW, NJ
April 2012.downsized and now a 99er.
Atthehop is offline   Quote Quick Reply
Old 06-18-2012, 08:39 PM   #6
Jeeper
 
div4gold's Avatar
 
Join Date: Feb 2012
Location: WA
Posts: 506
If you don't have the time to take it down then just drive it and if it starts getting worse look for some alternative transportation until you can fix it right. Good luck.
__________________
2006 TJ Unlimited, stock.
div4gold is offline   Quote Quick Reply
Old 06-19-2012, 07:43 AM   #7
Jeeper
 
Join Date: Feb 2012
Location: Georgia
Posts: 276
Pull the pan and see whats wrong.

Sometime back with about 80,000 miles, I heard what I thought was a rod knock after I lost oil pressure. Long story made short, the oil pressure turned out to be an intermittent oil pressure sensor, and the knock was the AC compressor clutch, but better to be safe than sorry when you see no oil pressure on the highway.

I pulled the pan and plasti-gauged the rods and mains. My crank looked good with no signs of wear, the rod bearings were showing signs of wear, and the mains were within tolerance and looked like new. I replaced the oil pump and rod bearing only. When you change your rod bearings, plasti gauge a new bearing and check your clearance, there are 0.001 over sized rod bearings available which will bring a worn crank back to tolerance.

I now have 230,000 miles on the Jeep and have a solid 35 psi at idle after a long drive on hot day in Florida.

crallscars 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




» Network Links
»Jeep Parts
» Featured Product

All times are GMT -5. The time now is 10:48 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