2.4l piston problems - 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 Wrangler Forums > TJ Wrangler Technical Forum > 2.4l piston problems

ZONE 4.25" combo lift for TJ available at Rockridge4wJeep Wrangler Bushwacker Flat Fender Flare Sale at BaselinRIGID LED Light Blowout Sale - All Sizes, All Series, all

Reply
Unread 09-16-2014, 12:36 AM   #1
bigsherm2211
Registered User
2000 TJ Wrangler 
 
Join Date: Mar 2013
Location: Irvine, California
Posts: 3
2.4l piston problems

Hey guys, my Haynes manual doesn't provide any cylinder specs for the 2.4l engine so i figured i would ask you guys.

i have a 2000 TJ with a 2.4l engine. a few years ago the #4 piston broke a skirt. at the time i didn't have the tools to measure out the bore and all that so i just got an OEM piston and threw it in there. a few years later i lost compression in that cylinder so i took it out and found that the rings were shattered and the gaps were hammered out a bit. i knew its days were numbered but i didn't have the means to do anything else so i just put new rings in as a band aid until i could fix it for good. its been OK for a few months, but the other day i lost compression again. i just took it apart today and found that the meat between the gaps had busted off. i measured out the bore at the top middle and bottom with a bore gauge and calipers (i didn't have a micrometer) and got these results:

Parallel measurements
Top- 3.880"
Middle- 3.880"
Bottom- 3.878"

Perpendicular measurements
Top- 3.870"
Middle- 3.874"
Bottom- 3.877"

I measured several times to be sure and they were all approximately the same. my main question is what are the dimensions for the bore supposed to be, what is the piston size supposed to be, and what are the piston-to-bore gap tolerances? also, should i be worried about the bore being out of round and tapered or is is within acceptable limits? i can certainly measure them again to be sure, maybe my technique is a bit off. anyway thanks ahead of time for any help.

bigsherm2211 is offline   Reply With Quote Quick reply to this message
Unread 09-16-2014, 09:27 AM   #2
wwch99tj
Registered User
1999 TJ Wrangler 
 
Join Date: Apr 2010
Location: Felton, Delaware
Posts: 3,049
98.45 to 98.48 mm (3.8759 to 3.8775 in)

Pulled from here but the blocks are the same 87-02... by the way you have a 2.5l engine
http://www.justanswer.com/jeep/3a214...ep-engine.html

Not sure about the rest of your questions.

Sent from my Galaxy Note 2 using my thumb
wwch99tj 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.