I think heads cracked but now not so sure - JeepForum.com

 
LinkBack Thread Tools
post #1 of 3 Old 04-07-2012, 02:45 PM Thread Starter
CJSport
Registered User
2001 XJ Cherokee 
 
Join Date: Mar 2012
Location: monmouthbeach
Posts: 73
I think heads cracked but now not so sure

I had posted where did my antifreeze go so I hope I'm not effing this up by restarting a post but I have all the symptoms af a cracked head except no mily oil no residue on oil cap but do smell antifreeze not burning it at least UI dont think so. My check engine light came on after a cylinder 3 misfire code and after can of carb cleaner it was fine the check engine light was reset, I had almost run out of gas I was driving on fumes so put 3 gallons in it ran it for 5 mins shut it off got back in 10 min. later and misfiring and the ck engine light flashed then went solid so I drove home came to work light still on shut down hour later got in started up and no light whats going on?

CJSport is offline  
Sponsored Links
Advertisement
 
post #2 of 3 Old 04-07-2012, 09:46 PM
deputyvaughn
Registered User
1962 CJ5 
 
Join Date: Feb 2011
Location: Somerville
Posts: 20
Could be a cracked head, block, or just a blown head gasket leaking into the cylinders. Won't know until you do a compression test, pressure test and probably take off the head to inspect after you have results from testing to tell you what you are looking for. In the end, unless it passes all the above test, you will have to take it apart and inspect and have the machine shop test the head (pressure test or magnaflux).

Scott

I may get lost....but I won't get stuck....JEEP
deputyvaughn is offline  
post #3 of 3 Old 04-08-2012, 07:23 PM
laybackman
Bikini Bridge Inspector
 
laybackman's Avatar
2010 JK Wrangler 
 
Join Date: Dec 2002
Location: Massachusetts
Posts: 6,889
Quote:
Originally Posted by CJSport View Post
I had posted where did my antifreeze go so I hope I'm not effing this up by restarting a post but I have all the symptoms af a cracked head except no mily oil no residue on oil cap but do smell antifreeze not burning it at least UI dont think so. My check engine light came on after a cylinder 3 misfire code and after can of carb cleaner it was fine the check engine light was reset, I had almost run out of gas I was driving on fumes so put 3 gallons in it ran it for 5 mins shut it off got back in 10 min. later and misfiring and the ck engine light flashed then went solid so I drove home came to work light still on shut down hour later got in started up and no light whats going on?
Different problem warrants a new thread. One scenario...Over time the spark plug contact loses metal which makes the gap larger and larger until you get a misfire DTC and it runs poorly. Check your plugs.

As for a possible cracked head take your oil filler cap out of the valve cover. Then stand on a five gallon bucket peek down inside said oil cap hole and look for a 'clean streak' across the head betweeen #3 & #4 cylinder. No streak? Then you probably do not have the normal cracked head problem. If you see a clean streak across the head between #3 & #4 valve sets, start the engine then using then the throttle cable rev the engine and look for any sign of 'bubbling' They will be tiny. Use a good LED flashlight to illuminate the oil filler hole. CDo you see bubbles? Yes...you're boned.... been there done that and posted a thread about it.

EDIT. Check reply #6 to see what the clean streak may look like.

Do you know what was good about the good old days? I wasn't good, And I wasn't old!

Senators and Congressman should wear uniforms like NASCAR drivers so we could identify their corporate sponsors....
laybackman is offline  
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.



Email Address:
OR

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.




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



Similar Threads
Thread Thread Starter Jeep Forums Replies Last Post
Heads Homeboundcat Engines & Drivetrain 5 02-16-2011 04:56 PM
heads? herbiehind Engines & Drivetrain 3 11-27-2009 05:53 PM
Heads same on 2.5 MPI and TBI??? 90-4banger Engines & Drivetrain 1 02-17-2005 07:51 AM
258 I6 heads interchangeable? Seether Engines & Drivetrain 3 11-09-2004 03:23 PM
258 heads rustyCJ Engines & Drivetrain 1 12-12-2002 11:46 PM

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 On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome