New (used) motor or repair? - JeepForum.com
Search  
Sign Up   Today's Posts
User: Pass: Remember?
Advertise Here
Jeep Home Jeep Forum Jeep Classifieds Jeep Registry JeepSpace Jeep Reviews Jeep Gallery Jeep Clubs Jeep Groups Jeep Videos Jeep Events Jeep Articles
Go Back JeepForum.com > Models > Jeep Grand Cherokee & Commander Forums > ZJ Grand Cherokee Forum > New (used) motor or repair?

Rockridge 4WD IS Taking Zone Offroad Suspension Lift Kits ZONE 4.25" combo lift for TJ available at Rockridge4wG2 Disc Brake Conversion Kit for Jeep Wrangler YJ TJ LJ Ch

Reply
Unread 06-17-2013, 07:41 PM   #1
savannahzj
Registered User
1998 ZJ 
 
Join Date: Apr 2011
Location: savannah, ga
Posts: 191
New (used) motor or repair?

A little history first. About 6 months ago the crank pulley went out. While pressing the new one on we had to tap on the new pulley, press further, and tap some more. About a month later, the 4.0 developed a slight tap that was in unison with rpms. The tap was light, and many said it was probably excessive end play. Today, under slight acceleration, it sounded like something let loose and a very loud tap has developed. No chage in idle, oil pressure, or temp. But it is very loud, loudest on slight acceleration, meaning at no throttle(coasting) or medium throttle it quiets down. I drove approximately 60 miles like this, babying it all the way, but at highway speed. It got no worse during or after the trip. I'm guessing rod bearing??? I will try to find out more tomorrow by pulling plug wires to isolate a cylinder. My question is... because of my stupidity during the crank pulley repair, is it worth trying to fix one cylinder? Are the others far behind? Or am I totally off base. Any input will be greatly appreciated, as this is my DD. Oh, and yes oil is fairly new and level is good. Thanks.

savannahzj is offline   Reply With Quote Quick reply to this message
Unread 06-17-2013, 08:09 PM   #2
jt97tj
Registered User
1998 ZJ 
 
Join Date: Mar 2009
Location: SC
Posts: 110
Is it a top end noise? Pull the valve cover and perform an inspection.
jt97tj is offline   Reply With Quote Quick reply to this message
Unread 06-18-2013, 06:39 AM   #3
zj97ltd
Registered User
1993 ZJ 
 
Join Date: Apr 2013
Location: Cape Coral, FLORIDA
Posts: 1,078
Usually taps are up top, knocks are down below. It might not be as bad as you think if it's a tap.
zj97ltd is offline   Reply With Quote Quick reply to this message
Reply

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the JeepForum.com forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid e-mail address for yourself.
Note: All free e-mails have been banned due to mis-use. (Yahoo, Gmail, Hotmail, etc.)
Don't have a non-free e-mail address? Click here for a solution: Manual Account Creation
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






Jeep, Wrangler, Cherokee, Grand Cherokee, and other models are copyrighted and trademarked to Jeep/Chrysler Corporation. JeepForum.com is not in any way associated with Jeep or the Chrysler Corp.